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elmbrouk
Active Contributor

Join Date: Mar 2007
Posts: 12

Temperature Codes

11/11/2009 2:18 PM

Hallo every one:

I work in FPSO for TOTAL and I ordered an apparatus " Radar Transmitter " with code ( EEx ia [ia] IIC or IIB T6 or T5 ) from a supplier.

And I recieved the instrument witha code ( EEx ia [ia] IIC or IIB T4 )

Can I install and used it with this code, Is it safe to use it?
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Pathfinder Tags: Temperature Code Classification
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The Prof
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Engineering Fields - Mechanical Engineering - New Member Hobbies - CNC - New Member

Join Date: Aug 2006
Location: Western Australia
Posts: 767
Good Answers: 58
#1

Re: Temperature Codes

11/11/2009 9:51 PM

Nobody can answer your question as we do not know the area classification or the details of the location or installation.

Getting old and not an Electrical Engineer so please check these figures. (I think they stayed the same with change zone/division)

Your specification asks for a maximum surface temperature (at 40 DegC) of T5 = 100 degC or T6 = 85 degC.

You have been supplied with a piece of equipment that could reach a surface temperature of T4 = 135 degC.

You need to decide whether this temperature poses a hazard or not.

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gkishorenair
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Join Date: Jul 2008
Location: India, Kuwait
Posts: 31
#2

Re: Temperature Codes

11/11/2009 11:35 PM

I would agree with "The Prof".

Let me put this in another way:

If the area where this transmitter is going to be installed contains gases or vapours which has an ignition temperature of 135 deg C or less (either continuous or during process upset) , this instrument is not safe to be installed.

Like the prof said, you have to find the area classification of the location.
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_Leon_
Commentator

Join Date: Jul 2009
Posts: 63
#3

Re: Temperature Codes

11/12/2009 2:32 PM

I too am in full agreement with previous replies regarding surface temperature class however,from my own experience I would haul the supplier over rough ground for 2 or 3 miles whilst beating them over the head with the contractual order spec!!!! At all departmental levels,including quality control etc etc etc

The "big stick" approach does still work surprisingly enough.
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elmbrouk
Active Contributor

Join Date: Mar 2007
Posts: 12
#4

Temperature Codes

11/14/2009 1:00 AM

Hi Gentlemen,

Thank all for concern:

The Classification of the area, where the transmitter is installed is Zone "I",

The transmitter is installed at the top of oil storage tank, where there is oil at the tank and inert gases + H2S gas at the top and oil and water at the bottom, the inert gas to prevent from spark ignitions.
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vikram2712
Participant

Join Date: Nov 2009
Posts: 1
#5

Re: Temperature Codes

11/14/2009 8:20 AM

If rest of the classification code is correct as per your requirement and if you are worrying about the temperature class only. then whatever being quoted at T4 can be used unless you do not have any cost implication in your budget.As T5 or T6 class are generally lower tempearture range and you have being offered an instrument device with higher temerature range.I guess i have answered your query.
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Users who posted comments:

_Leon_ (1); elmbrouk (1); gkishorenair (1); The Prof (1); vikram2712 (1)

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