Hazardous Area Instruments

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muru_ayyappan Participant Join Date: Aug 2015 Posts: 1	Hazardous Area Instruments 08/05/2015 4:23 AM
	For one our current projects for FPSO topside modules as per HAC drawing the area is classified as Zone 2 as per the project specification all filed instruments need to certified as Exia Suitable for Zone 1 We have some analysers from Emerson like (pH,ORP...) the certification is for Zone 1 Exia but the enclosure material is polycarbonate Customer does not accept polycarbonate and he wants SS316 as minimum. Vendor is proposing place this transmitter inside a noncertified SS316 JB with transparent cover and with IP66 integrity Is this accepted or we need to get one more certification as whole unit ? Ayyappan CR4 ADMIN - email address removed From the CR4 Rules: Do not post phone numbers or email addresses. The CR4 Admin will delete all phone numbers and email addresses posted in threads or comments. You can share this information via the CR4 internal messaging system.
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Tornado Guru Join Date: May 2009 Location: Richland, WA, USA Posts: 21017 Good Answers: 795	#1 Re: Hazardous Area Instruments 08/05/2015 8:50 AM
	In a sensible world, that would be acceptable; however, you still need to satisfy the AHJ (authority having jurisdiction). __________________ In vino veritas; in cervisia carmen; in aqua E. coli.
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North of 60 Guru Join Date: Mar 2007 Location: Iqaluit, NU. Canada Posts: 1854 Good Answers: 140	#2 Re: Hazardous Area Instruments 08/05/2015 9:58 AM
	... and you need your customer's approval. Get them and the engineer of record on the project to sign off on this approach. To not have to bother with additional certifications, put the entire unit (with its plastic cover) inside the SS enclosure. __________________ Joe Contractor to Electrical Inspector, "What do you mean you are going to make me follow the code?".
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PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on. Posts: 32175 Good Answers: 839	#3 Re: Hazardous Area Instruments 08/05/2015 2:19 PM
	pH and ORP don't need analysers, just regular instruments. Move the instruments to a non-hazardous zone and connect them to the hazardous area equipment using extended cables. Ask the Client for a list of type-approved equipment, i.e. the materials kept as standardised stock spares for other, similar installations. __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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lyn Guru Join Date: Oct 2008 Posts: 42355 Good Answers: 1693	#4 Re: Hazardous Area Instruments 08/05/2015 7:30 PM
	Singapore has to have codes and standards which govern hazardous area instrumentation. You are responsible for meeting all the requirements of the codes and standards AND satisfying your customer's desires and requirements. If you are not qualified to negotiate this with the local authorities and your customer, a hired consultant is in order. Good luck.
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Wal Guru Join Date: Jun 2011 Location: Phnom Penh Posts: 4019 Good Answers: 102	#5 Re: Hazardous Area Instruments 08/06/2015 1:20 AM
	Why the transparent cover? __________________ Difficulty is not an obstacle it is merely an attribute.
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lyn (1); North of 60 (1); PWSlack (1); Tornado (1); Wal (1)

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