Maximum Safe Voltage in Hydrocarbon Plants

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giri Power-User Join Date: May 2009 Location: Some where on Earth !!!. Posts: 243 Good Answers: 2	Maximum Safe Voltage in Hydrocarbon Plants 12/27/2009 9:32 AM
	Dear friends,what is the safe voltage limit that can be exposed in the hydrocarbon plants.....can we use battery operated ordinary device/meters in field ?which standard represents that?Thank you,.... __________________ "Know something about everything and everything about something"
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tcmtech Guru Join Date: Jun 2009 Location: South of Minot North Dakota Posts: 8376 Good Answers: 775	#1 Re: Safe voltage in the hydrocarbon industries...... 12/27/2009 1:57 PM
	I think its inversly proportional to the level of stupidity of the workers involved. Smart workers may handle many hundreds of volts without ever causing problems. But the right idiot could manage to burn the whole place down with nothing more than a near dead AA battery as the ignition source!
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Tornado Guru Join Date: May 2009 Location: Richland, WA, USA Posts: 21017 Good Answers: 795	#2 Re: Safe voltage in the hydrocarbon industries...... 12/27/2009 3:49 PM
	See: NEC Division 1 versus Division 2 locations. NEMA-9 explosion-proof enclosures. Explosion-proof (XP) motors. Conduit sealing fittings and techniques to prevent explosive vapors from entering. Intrinsically Safe devices. There is a lot to this, well beyond forum-type answers. __________________ In vino veritas; in cervisia carmen; in aqua E. coli.
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Steve S. Guru Join Date: Aug 2007 Posts: 1790 Good Answers: 87	#3 Re: Safe voltage in the hydrocarbon industries...... 12/27/2009 5:03 PM
	Tornado is right.. Even voltage down 24 VDc can cause a spark that will ignite a hydrocarbon leak. If you are using meters that are not intrisically safe, then you need to use a sniffer and make sure that there are no hydrocarbon leaks in the area, along with the proper hot work permit.
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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	#4 Re: Maximum Safe Voltage in Hydrocarbon Plants 12/29/2009 7:58 AM
	http://en.wikipedia.org/wiki/Electrical_Equipment_in_Hazardous_Areas __________________ "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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PWSlack (1); Steve S. (1); tcmtech (1); Tornado (1)

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