Instrument Engineering

Data Sheet Works in Intools with Limitied Number or License

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<span style="background-color: #f6f8f9; font-family: inherit; font-size: 13px; line-height: 16.639999389648438px;">Smartplant Instrumentation (formerly known as Intools) requires license like any other software. During execution of a project, the number of licenses used within a project may vary from only one license up to tens of licenses. If cost becomes major concern and the budget is limited, the number of licenses could be reduced by the following tricks. However this trick is only applicable for data sheet work which is prepared by more than one Instrument engineer. This trick could not be applied to other works such as wiring, loop, hook-up. </span></div>
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<span style="background-color: #f6f8f9; font-family: inherit; font-size: 13px; line-height: 16.639999389648438px;">This procedure needs Intools External Editor, a freeware that can be downloaded in Integraph website. Please note that the version of Intools External Editor shall be compatible with that of Smartplant Instrumentation. </span></div>
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<span style="background-color: #f6f8f9; font-family: inherit; font-size: 13px; line-height: 16.639999389648438px;">One engineer will be assigned as the Intools operator for exporting the blank specification sheet, the other Instrument engineers shall fill in the specification sheet (data sheet) using Intools External Editor without using Intools software. Once it is completed, the Intools operator shall import it back to Intools. </span></div>
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<span style="background-color: #f6f8f9; font-family: inherit; font-size: 13px; line-height: 16.639999389648438px;">The following is the procedure of this work: </span></div>
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<span style="background-color: #f6f8f9; font-family: inherit; font-size: 13px; line-height: 16.639999389648438px;">Exporting specification sheet (creating .isf files) – by Intools operator </span></div>
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<li><span style="background-color: #f6f8f9; font-family: inherit; font-size: 13px; line-height: 16.639999389648438px;">Open instrument specification for the specified tag number </span></li>
<li><span style="background-color: #f6f8f9; font-family: inherit; font-size: 13px; line-height: 16.639999389648438px;">Select “Action” >> “Export Data..” </span></li>
<li><span style="background-color: #f6f8f9; font-family: inherit; font-size: 13px; line-height: 16.639999389648438px;">You will be prompted the location and file name to be saved. Ensure the file type is Intools Spec Files (*.isf)</span></li>
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<span style="background-color: #f6f8f9; color: #545454; font-size: 13px; line-height: 16.639999389648438px;"><span style="font-family: inherit;">Filling detail data in specification sheet using Intools – by Instrument engineer </span></span></div>
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<li><span style="background-color: #f6f8f9; color: #545454; font-family: inherit; font-size: 13px; line-height: 16.639999389648438px;">Open windows explorer and go to location where the files are saved. If the Intools external editor has been installed, the file will be readable. </span></li>
<li><span style="background-color: #f6f8f9; color: #545454; font-family: inherit; font-size: 13px; line-height: 16.639999389648438px;">Open the the file and fill the data sheet as necessary, and do not forget to save once finished.</span></li>
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<span style="background-color: #f6f8f9; color: #545454; font-size: 13px; line-height: 16.639999389648438px;"><span style="font-family: inherit;">Importing specification sheet – by Intools operator </span></span><br />
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<li><span style="background-color: #f6f8f9; color: #545454; font-size: 13px; line-height: 16.639999389648438px;"><span style="font-family: inherit;">Open instrument specification for the specified tag number </span></span></li>
<li><span style="background-color: #f6f8f9; color: #545454; font-size: 13px; line-height: 16.639999389648438px;"><span style="font-family: inherit;">Select “Action” >> “Import Data..” </span></span></li>
<li><span style="font-family: inherit;"><span style="background-color: #f6f8f9; color: #545454; font-size: 13px; line-height: 16.639999389648438px;">You will be prompted the source file to be imported. </span><span style="background-color: #f6f8f9; color: #545454; font-size: 13px; line-height: 16.639999389648438px;">Note: The tag number should match otherwise it will fail to import. </span></span></li>
<li><span style="background-color: #f6f8f9; color: #545454; font-size: 13px; line-height: 16.639999389648438px;"><span style="font-family: inherit;">Wait for a moment since Intools progressing importing the data.</span></span></li>
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<span style="background-color: #f6f8f9; color: #545454; font-family: inherit; font-size: 13px; line-height: 16.639999389648438px;">Summary: This method allows the progress of data sheet preparation work to be faster even if only one license is available. Instead of using Intools with many licences, by using one license only, the Intools operator does export and import the files to be filled by multiple Instrument engineers using Intools external editor.</span><br />
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<span style="background-color: #f6f8f9; color: #545454; font-family: 'Open Sans', Arial, sans-serif; font-size: 13px; line-height: 16.639999389648438px;">Read More at: </span><a href="http://forums.instreng.com/threads/data-sheet-works-in-intools-with-limitied-number-or-license.2128/" style="background-color: #f6f8f9; color: #666666; font-family: 'Open Sans', Arial, sans-serif; font-size: 13px; line-height: 16.639999389648438px; text-decoration: none;">Data Sheet Works in Intools with Limitied Number or License | InstrEng Forums</a><br />
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Data Sheet Works in Intools with Limitied Number or License

Smartplant Instrumentation (formerly known as Intools) requires license like any other software. During execution of a project, the number...

Blowdown Valve Status After Depressuring

What should the Blowdown valve (BDV) status be after depressuring ? After reaching the isolated vessel pressure of 50% of design pressure or...

What is a Solenoid Valve?

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A solenoid valve is an electromechanical device used for controlling liquid or gas flow. The solenid valve is controlled by electrical current, which is run through a coil. When the coil is energized, a magnetic field is created, causing a plunger inside the coil to move. Depending on the design of the valve, the plunger will either open <img align="right" alt="solenoid valve picture" height="293" hspace="10" src="http://www.solenoid-valve-info.com/images/solenoid_valve_1.jpg" style="max-width: none;" vspace="10" width="247" />or close the valve. </div>
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When electrical current is removed from the coil, the valve will return to its de-energized state.</div>
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In direct-acting solenoid valves, the plunger directly opens and closes an orifice inside the valve. In pilot-operated valves (also called the servo-type), the plunger opens and closes a pilot orifice. The inletline pressure, which is led through the pilot orifice, opens and closes the valve seal.</div>
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The most common solenoid valve has two ports: an inlet port and an outlet port. Advanced desigs may have three or more ports. Some designs utilize a manifold-type design.</div>
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Solenoid valves make automation of fluid and gas control possible. Modern solenoid valves offer fast operation, high reliability, long service life, and compact design.</div>
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<span style="font-family: Verdana, Geneva, sans-serif; font-size: x-small;"><span style="line-height: 16px;">Read more: </span><span style="line-height: 16px;"><a href="http://www.instreng.com/community/threads/solenoid-valve-basics.1820/">http://www.instreng.com/community/threads/solenoid-valve-basics.1820/</a></span></span></div>
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What is a Solenoid Valve?

A solenoid valve is an electromechanical device used for controlling liquid or gas flow. The solenid valve is controlled by electrical cur...

Maintain a minimum distance between the blowdown valve and restriction orifice

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Following is a typical arrangement of blowdown pipe arrangement consisting blowdown valve (BDV), restriction orifice (RO), and downstream piping. It is recommended to maintain a minimum length of spool pipe b/w the BDV and RO.<span style="background-color: white; color: #444444; font-family: Ubuntu, Helvetica, Arial, sans-serif; font-size: 14px; line-height: 24px;"><br /></span>
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This arrangement typically used to depressurized a system inventory to a safe level within a limited time to minimized catastrophic scenario. Between the Blowdown valve and Restriction orifice, there 600 mm spool piece between them. What the main purpose of this 600mm spool piece ?<div>
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Reason: There will be Joule Thompson (JT) effect at orifice due to hydrocarbon fluid expansion typically but to a high pressure let down. Generally the JT effect will produce a sub zero temperature (below 0 C) at RO and during the blowdown process low temperature will propagate to the BDV causing moisture from atmosphere will freeze on outside of the Blowdown valve.(Latent heat in the piping will transfer to cold fluid and slowly approaching this subzero temperature. The "coldness" will travel back to upstream of Restriction orifice and probably reaches Blowdown valve. It potentially cause the upstream Blowdown valve body temperature drops below subzero as well.) Operator will not be able to close the BDV after the blowdown and it could also cause backflow creating potential hazardous situation.  Those "general good engineering practice is to locate Restriction orifice, 600mm downstream of Blowdown valve.</div>
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Maintain a minimum distance between the blowdown valve and restriction orifice

Following is a typical arrangement of blowdown pipe arrangement consisting blowdown valve (BDV), restriction orifice (RO), and downstream p...

Conduit Classification Codes

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<span style="font-size: x-small;"><span style="line-height: 14px;">You might notice that, for a conduit there is coded printed on its surface.</span></span></div>
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<span style="font-size: x-small;"><span style="line-height: 14px;">Those coded are actually the BS Standard (BS EN 50086) whereby it indicates the technical data for the conduit itself.  In general, there are 6 (six) digits being used. Each digit will represent its own descriptions.</span></span></div>
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<b><span style="font-size: x-small;"><span style="line-height: 14px;">1<sup>st</sup> Digit</span></span></b></div>
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<span style="font-size: x-small;"><b>Resistance To Compression</b></span></div>
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<span style="font-size: x-small;"><b>Code</b></span></div>
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<span style="font-size: x-small;"><b>Duty</b></span></div>
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<span style="font-size: x-small;"><b>Newton</b></span></div>
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<span style="font-size: x-small;">0</span></div>
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<span style="font-size: x-small;">Non-declared</span></div>
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<span style="font-size: x-small;">-</span></div>
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<span style="font-size: x-small;">1</span></div>
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<span style="font-size: x-small;">Very Light</span></div>
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<span style="font-size: x-small;">125</span></div>
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<span style="font-size: x-small;">2</span></div>
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<span style="font-size: x-small;">Light</span></div>
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<span style="font-size: x-small;">320</span></div>
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<tr style="height: 23.45pt;"><td style="border-right-color: black; border-style: none solid solid; border-width: medium 1pt 1pt; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">3</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">Medium</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">750</span></div>
</td></tr>
<tr style="height: 23.45pt;"><td style="border-right-color: black; border-style: none solid solid; border-width: medium 1pt 1pt; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">4</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">Heavy</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">1250</span></div>
</td></tr>
<tr style="height: 23.45pt;"><td style="border-right-color: black; border-style: none solid solid; border-width: medium 1pt 1pt; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">5</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">Very Heavy</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">4000</span></div>
</td></tr>
</tbody></table>
<div class="MsoNormal" style="background-color: #fefdfa; color: #333333; font-family: Arial, Helvetica, sans-serif; font-size: 13px; line-height: 18px;">
<br /></div>
<div class="MsoNormal" style="background-color: #fefdfa; color: red; font-family: Arial, Helvetica, sans-serif; font-size: 13px; line-height: 18px;">
<b><span style="font-size: x-small;"><span style="line-height: 14px;">2<sup>nd</sup> Digit</span></span></b></div>
<table border="1" cellpadding="0" cellspacing="0" class="MsoTableGrid" style="background-color: #fefdfa; border-collapse: collapse; border: medium none; color: #333333; font-family: Arial, Helvetica, sans-serif; font-size: 13px; line-height: 18px;"><tbody>
<tr style="height: 23.45pt;"><td colspan="3" style="border: 1pt solid black; height: 23.45pt; padding: 0in 5.4pt; width: 427.5pt;" width="570"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;"><b>Resistance To Impact</b></span></div>
</td></tr>
<tr style="height: 23.45pt;"><td style="border-right-color: black; border-style: none solid solid; border-width: medium 1pt 1pt; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;"><b>Code</b></span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;"><b>Duty</b></span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;"><b>Joule</b></span></div>
</td></tr>
<tr style="height: 23.45pt;"><td style="border-right-color: black; border-style: none solid solid; border-width: medium 1pt 1pt; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">0</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">Non-declared</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">-</span></div>
</td></tr>
<tr style="height: 23.45pt;"><td style="border-right-color: black; border-style: none solid solid; border-width: medium 1pt 1pt; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">1</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">Very Light</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">0.5</span></div>
</td></tr>
<tr style="height: 23.45pt;"><td style="border-right-color: black; border-style: none solid solid; border-width: medium 1pt 1pt; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">2</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">Light</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">1</span></div>
</td></tr>
<tr style="height: 23.45pt;"><td style="border-right-color: black; border-style: none solid solid; border-width: medium 1pt 1pt; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">3</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">Medium</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">2</span></div>
</td></tr>
<tr style="height: 23.45pt;"><td style="border-right-color: black; border-style: none solid solid; border-width: medium 1pt 1pt; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">4</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">Heavy</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">6</span></div>
</td></tr>
<tr style="height: 23.45pt;"><td style="border-right-color: black; border-style: none solid solid; border-width: medium 1pt 1pt; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">5</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">Very Heavy</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">20</span></div>
</td></tr>
</tbody></table>
<div class="MsoNormal" style="background-color: #fefdfa; color: #333333; font-family: Arial, Helvetica, sans-serif; font-size: 13px; line-height: 18px;">
<br /></div>
<div class="MsoNormal" style="background-color: #fefdfa; color: red; font-family: Arial, Helvetica, sans-serif; font-size: 13px; line-height: 18px;">
<b><span style="font-size: x-small;"><span style="line-height: 14px;">3<sup>rd</sup> Digit</span></span></b></div>
<table border="1" cellpadding="0" cellspacing="0" class="MsoTableGrid" style="background-color: #fefdfa; border-collapse: collapse; border: medium none; color: #333333; font-family: Arial, Helvetica, sans-serif; font-size: 13px; line-height: 18px;"><tbody>
<tr style="height: 23.45pt;"><td colspan="2" style="border: 1pt solid black; height: 23.45pt; padding: 0in 5.4pt; width: 285pt;" width="380"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;"><b>Minimum Service Temperature</b></span></div>
</td></tr>
<tr style="height: 23.45pt;"><td style="border-right-color: black; border-style: none solid solid; border-width: medium 1pt 1pt; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;"><b>Code</b></span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;"><b>Temperature</b></span></div>
</td></tr>
<tr style="height: 23.45pt;"><td style="border-right-color: black; border-style: none solid solid; border-width: medium 1pt 1pt; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">1</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">+5<sup>o</sup>C</span></div>
</td></tr>
<tr style="height: 23.45pt;"><td style="border-right-color: black; border-style: none solid solid; border-width: medium 1pt 1pt; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">2</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">-5<sup>o</sup>C</span></div>
</td></tr>
<tr style="height: 23.45pt;"><td style="border-right-color: black; border-style: none solid solid; border-width: medium 1pt 1pt; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">3</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">-15<sup>o</sup>C</span></div>
</td></tr>
<tr style="height: 23.45pt;"><td style="border-right-color: black; border-style: none solid solid; border-width: medium 1pt 1pt; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">4</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">-25<sup>o</sup>C</span></div>
</td></tr>
<tr style="height: 23.45pt;"><td style="border-right-color: black; border-style: none solid solid; border-width: medium 1pt 1pt; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">5</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">-45<sup>o</sup>C</span></div>
</td></tr>
</tbody></table>
<div class="MsoNormal" style="background-color: #fefdfa; color: #333333; font-family: Arial, Helvetica, sans-serif; font-size: 13px; line-height: 18px;">
<br /></div>
<div class="MsoNormal" style="background-color: #fefdfa; color: red; font-family: Arial, Helvetica, sans-serif; font-size: 13px; line-height: 18px;">
<b><span style="font-size: x-small;"><span style="line-height: 14px;">4<sup>th</sup> Digit</span></span></b></div>
<table border="1" cellpadding="0" cellspacing="0" class="MsoTableGrid" style="background-color: #fefdfa; border-collapse: collapse; border: medium none; color: #333333; font-family: Arial, Helvetica, sans-serif; font-size: 13px; line-height: 18px;"><tbody>
<tr style="height: 23.45pt;"><td colspan="2" style="border: 1pt solid black; height: 23.45pt; padding: 0in 5.4pt; width: 285pt;" width="380"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;"><b>Minimum Service Temperature</b></span></div>
</td></tr>
<tr style="height: 23.45pt;"><td style="border-right-color: black; border-style: none solid solid; border-width: medium 1pt 1pt; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;"><b>Code</b></span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;"><b>Temperature</b></span></div>
</td></tr>
<tr style="height: 23.45pt;"><td style="border-right-color: black; border-style: none solid solid; border-width: medium 1pt 1pt; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">1</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">+60<sup>o</sup>C</span></div>
</td></tr>
<tr style="height: 23.45pt;"><td style="border-right-color: black; border-style: none solid solid; border-width: medium 1pt 1pt; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">2</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">+90<sup>o</sup>C</span></div>
</td></tr>
<tr style="height: 23.45pt;"><td style="border-right-color: black; border-style: none solid solid; border-width: medium 1pt 1pt; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">3</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">+105<sup>o</sup>C</span></div>
</td></tr>
<tr style="height: 23.45pt;"><td style="border-right-color: black; border-style: none solid solid; border-width: medium 1pt 1pt; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">4</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">+120<sup>o</sup>C</span></div>
</td></tr>
<tr style="height: 23.45pt;"><td style="border-right-color: black; border-style: none solid solid; border-width: medium 1pt 1pt; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">5</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">+150<sup>o</sup>C</span></div>
</td></tr>
<tr style="height: 23.45pt;"><td style="border-right-color: black; border-style: none solid solid; border-width: medium 1pt 1pt; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">6</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">+250<sup>o</sup>C</span></div>
</td></tr>
<tr style="height: 23.45pt;"><td style="border-right-color: black; border-style: none solid solid; border-width: medium 1pt 1pt; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">7</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">+400<sup>o</sup>C</span></div>
</td></tr>
</tbody></table>
<div class="MsoNormal" style="background-color: #fefdfa; color: #333333; font-family: Arial, Helvetica, sans-serif; font-size: 13px; line-height: 18px;">
<br /></div>
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<b><span style="font-size: x-small;"><span style="line-height: 14px;">5<sup>th</sup> Digit</span></span></b></div>
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<span style="font-size: x-small;"><b>Resistance To Bending</b></span></div>
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<span style="font-size: x-small;"><b>Code</b></span></div>
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<span style="font-size: x-small;"><b>Temperature</b></span></div>
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<span style="font-size: x-small;">1</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">Rigid Conduit</span></div>
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<b><span style="font-size: x-small;"><span style="line-height: 14px;">6<sup>th</sup> Digit</span></span></b></div>
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<span style="font-size: x-small;"><b>Electrical Property</b></span></div>
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<span style="font-size: x-small;"><b>Code</b></span></div>
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<span style="font-size: x-small;"><b>Temperature</b></span></div>
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<span style="font-size: x-small;">2</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 142.5pt;" width="190"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">Electrical Insulating</span></div>
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<span style="font-size: x-small;"><span style="line-height: 14px;">Below is the example of three numbers of conduit based on different conduit classification code.</span></span></div>
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<tr style="height: 23.45pt;"><td style="border: 1pt solid black; height: 23.45pt; padding: 0in 5.4pt; width: 120.6pt;" width="161"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;"><b>Standard</b></span></div>
</td><td colspan="3" style="border-style: solid solid solid none; border-width: 1pt 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 358.2pt;" width="478"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;"><b>BS EN 50086-2-1</b></span></div>
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<span style="font-size: x-small;"><b>Conduit</b></span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 129.1pt;" width="172"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">Conduit 1</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 114.55pt;" width="153"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">Conduit 2</span></div>
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<span style="font-size: x-small;">Conduit 3</span></div>
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<tr style="height: 23.45pt;"><td style="border-right-color: black; border-style: none solid solid; border-width: medium 1pt 1pt; height: 23.45pt; padding: 0in 5.4pt; width: 120.6pt;" width="161"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;"><b>Classification Code</b></span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 129.1pt;" width="172"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">222112</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 114.55pt;" width="153"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">332112</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 114.55pt;" width="153"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">442112</span></div>
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<tr style="height: 23.45pt;"><td style="border-right-color: black; border-style: none solid solid; border-width: medium 1pt 1pt; height: 23.45pt; padding: 0in 5.4pt; width: 120.6pt;" width="161"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;"><b>Duty</b></span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 129.1pt;" width="172"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">Light</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 114.55pt;" width="153"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">Medium</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 114.55pt;" width="153"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">Heavy</span></div>
</td></tr>
<tr style="height: 23.45pt;"><td style="border-right-color: black; border-style: none solid solid; border-width: medium 1pt 1pt; height: 23.45pt; padding: 0in 5.4pt; width: 120.6pt;" width="161"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;"><b>Compression (N)</b></span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 129.1pt;" width="172"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">320</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 114.55pt;" width="153"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">750</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 114.55pt;" width="153"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">1250</span></div>
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<tr style="height: 23.45pt;"><td style="border-right-color: black; border-style: none solid solid; border-width: medium 1pt 1pt; height: 23.45pt; padding: 0in 5.4pt; width: 120.6pt;" width="161"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;"><b>Impact (J)</b></span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 129.1pt;" width="172"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">1</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 114.55pt;" width="153"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">2</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 114.55pt;" width="153"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">6</span></div>
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<tr style="height: 23.45pt;"><td style="border-right-color: black; border-style: none solid solid; border-width: medium 1pt 1pt; height: 23.45pt; padding: 0in 5.4pt; width: 120.6pt;" width="161"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;"><b>Heat Resistant</b></span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 129.1pt;" width="172"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">10</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 114.55pt;" width="153"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">20</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 114.55pt;" width="153"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">40</span></div>
</td></tr>
<tr style="height: 23.45pt;"><td style="border-right-color: black; border-style: none solid solid; border-width: medium 1pt 1pt; height: 23.45pt; padding: 0in 5.4pt; width: 120.6pt;" width="161"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;"><b>Flame Propagation Resistance</b></span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 129.1pt;" width="172"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">25</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 114.55pt;" width="153"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">35</span></div>
</td><td style="border-style: none solid solid none; border-width: medium 1pt 1pt medium; height: 23.45pt; padding: 0in 5.4pt; width: 114.55pt;" width="153"><div align="center" class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: center;">
<span style="font-size: x-small;">45</span></div>
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<span style="font-size: x-small;"><br /></span></div>
</td></tr>
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</div>

Conduit Classification Codes

You might notice that, for a conduit there is coded printed on its surface. Those coded are actually the BS Standard (BS EN 50086) w...

What is the difference between MCCB Type B, C and D?

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Below are the comparison between MCCB type B, C and D.</div>
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<b>Type B</b></div>
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<b>Type C</b></div>
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<b>Type D</b></div>
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<tr><td style="background-color: transparent; border-bottom-style: solid; border-bottom-width: 1pt; border-color: rgb(236, 233, 216) black black; border-left-style: solid; border-left-width: 1pt; border-right-style: solid; border-right-width: 1pt; padding: 0in 5.4pt; width: 159.6pt;" valign="top" width="213"><div class="MsoNormalCxSpMiddle" style="line-height: normal; margin: auto auto 0pt;">
The magnetic operating limit ranging from 3 to 5 times of its rated current.</div>
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Normally used for wiring protection in lighting, socket outlet and control circuit.</div>
</td><td style="background-color: transparent; border-bottom-style: solid; border-bottom-width: 1pt; border-color: rgb(236, 233, 216) black black rgb(236, 233, 216); border-right-style: solid; border-right-width: 1pt; padding: 0in 5.4pt; width: 159.6pt;" valign="top" width="213"><div class="MsoNormalCxSpMiddle" style="line-height: normal; margin: auto auto 0pt;">
The magnetic operating limit ranging from 5 to 10 times of its rated current.</div>
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Normally used for overload and short circuit protection to protect for equipment with high making current.</div>
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</td><td style="background-color: transparent; border-bottom-style: solid; border-bottom-width: 1pt; border-color: rgb(236, 233, 216) black black rgb(236, 233, 216); border-right-style: solid; border-right-width: 1pt; padding: 0in 5.4pt; width: 159.6pt;" valign="top" width="213"><div class="MsoNormalCxSpMiddle" style="line-height: normal; margin: auto auto 0pt;">
The magnetic operating limit ranging from 10 to 20 times of its rated current.</div>
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Normally used to prevent undesired early trip for an electrical equipment with very high making current such as heavy motor, transformer, etc.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEieEzJCg2XdJQR6M8zsazSpgxXXX4ilXQW2GmbODjv05da68pIKAhFQT0TnARvYwQnyhcQbnvwYs_LDUE9E9591B0DIEXK7sKOBYtUxK8TNJBSyWmIlSwX2SYJpKLb7jBvps9K3leEx3N9h/s1600/mccb-moulded-case-circuit-breaker.png" imageanchor="1" style="background-color: #fefdfa; font-family: Arial, Tahoma, Helvetica, FreeSans, sans-serif; font-size: 13px; line-height: 18px; margin-left: 1em; margin-right: 1em; text-align: center;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEieEzJCg2XdJQR6M8zsazSpgxXXX4ilXQW2GmbODjv05da68pIKAhFQT0TnARvYwQnyhcQbnvwYs_LDUE9E9591B0DIEXK7sKOBYtUxK8TNJBSyWmIlSwX2SYJpKLb7jBvps9K3leEx3N9h/s1600/mccb-moulded-case-circuit-breaker.png" /></a></div>

What is the difference between MCCB Type B, C and D?

Below are the comparison between MCCB type B, C and D. Type B Type C Type D The magnetic operating limit ranging from 3 to 5 t...

Depressuring within 15 minutes no longer applicable ?

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Recently i have discussed some issue related to system depressuring with some engineers. One of the topic where we were arguing about was the time limit on the depressuring. These engineers keep on stating that the emergency depressuring system shall be designed to depressure the facilities to 50% of its design pressure or 6.9 barg within 15 minutes.</div>
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There are many oil and gas company are practicing this approach. Above statement has been clearly stated in the company design manual. Many engineers has simply used above as criteria without confirming stress induced by internal pressure during the depressuring process upon allowable stress by the weakest component within the system.<br /><br /><span style="font-weight: bold;">API RP 521 Edition Fourth,</span><span style="font-weight: bold;"> "Pressure-relieving and Depressuring Systems</span>" section 3.19 has a statement<br /><blockquote style="background: url(http://webwormcpt.blogspot.com/2008/01/quote.jpg) 10px 0% no-repeat; border: medium none; font-style: italic; margin: 20px 0px; padding: 0px 20px 0px 50px;">
"<span style="color: #6600cc;">...A vapor depressuring system should have </span><span style="color: #6600cc; font-weight: bold;">adequate capacity to permit reduction of the vessel stress to a level at which stress rupture is not of immediate concern</span><span style="color: #6600cc;">. For sizing, this generally involves </span><span style="color: #6600cc; font-weight: bold;">reducing the equipment pressure from initial conditions to a level equivalent to 50% of the vessels design pressure within approximately 15 minutes</span><span style="color: #6600cc;">...</span>"</blockquote>
Many engineers has only considered the second part of the statement.<br /></div>
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With the issuance of <span style="font-weight: bold;">API Std 521 - ISO 23251, Edition Five, Jan 2007, "Pressure-relieving and Depressuring Systems</span>". In <span style="font-weight: bold;">section 5.20</span>, it clearly stated that</div>
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<span style="font-style: italic;">"...In order to be effective, the depressuring system shall depressure the vessel such that the reduced internal pressure keeps the stresses below the rupture stress. "</span></blockquote>
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Similar to earlier revision (<span style="font-weight: bold;">1997</span>), the time limit of 15 minutes is not a criteria. However, an example cited 15 minutes for a particular material and vessel was exposed to pool fire condition.</div>
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A depressuring system shall be designed such that the <span style="font-weight: bold;">stress resulted by internal pressure shall always below the rupture stress</span> (included fire scenario). This approach has been adopted for many cases and it appear that those thick wall vessel (more than 90 mm wall thickness) would allow longer than 15 minutes depressuring time. Medium wall thickness vessel (30-90mm) would see depressuring in the range of 3-15 minutes. While those vessel with wall thickness (less than 30 mm) would experience less than 3 minutes of depressuring. This leads to an excessive depressuring load and flare capacity.<br /><br /><span style="color: #cc0000; font-weight: bold;">Updated : Dec 2008</span></div>
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