Modification for hazardous class
Modification for hazardous class
(OP)
I am looking at a quote for a rotary screw air compressor. I find that it takes quite a bit of money for 'Modifications for hazardous class 1 division 2 group D'. Can some one please explain to me as to what is involved in this modification? Why is it so expensive? Also please tell me where I can read about these classes 1,2 etc. divisions and groups for hazardous class.





RE: Modification for hazardous class
Mike McCowan
Automation Specialist
Industrial Automated Systems
mvmccowan@iasengineering.com
RE: Modification for hazardous class
The NEC will give you the rules, but won't tell you anything about equipment deisgn. Google these key words: "explosion-proof", "flameproof", "Exd", "Exe", "Class1 hazardous area". Most suppliers (Crouse-Hinds, Killark, Hawke (Hubbell)) and certification agencies (CSA, UL, FM, SIRA, BASEEFA, Nemko, Demko...) have good sections on hazardous areas.
RE: Modification for hazardous class
RE: Modification for hazardous class
RE: Modification for hazardous class
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RE: Modification for hazardous class
Water vapor going into a rotary screw air compressor will also mess up the oil. An air compressor essentially triples the relative humidity of air. In a rotary screw compressor the oil is used partially to cool the air as it compresses. If the intake aire is over about 33% humidity you will have water condensing onto the oil in a high speed mortar and pestle. What comes out is salad dressing of much larger volume than the original oil and this then overflows into the air lines and gums up your equipment.
Now imagine doing this with gasoline vapor and you can see what kind of mess you can get. If you do this with propane vapor I can guaranteed that your system will blow up.