제 목 : EPA, OSHA Warn of Hazardous Valves
일 자 : 1998년 02월
제공처 : safety + Health(EPA Update)
< EPA, OSHA Warn of Hazardous Valves >
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The EPA and Occupational Safety and Health Administration recently
released a joint safety Alert to warn refineries, petrochemical plants,
chemical plants and power-generation frcilities about certain types of
check and butterfly valves.
A check valve controls the flow within a pipe to go in only one
direction; a butterfly valve is a type of check valve. Some of these valves
can fril or 'blow out,' which causes toxic and/or flammable gas releases,
fire and vapor-cloud explosions.Such failures can occur even when the
valves are operated within their pressure and temperature limits.
Most modern valves incorporate features designed to reduce or elimi-
nare the possibility of shaft blowout. But older valves with external ap-
pendages, such as pneumatic cylinders, counterweights, manual op-
erators or dashpots, may be subject to this hazard. Facilities should de-
termine if they have such valves, conduct a detailed hazard analysis to
determine the risk of valve failure, and replace high-risk valves.
For more information, contact EPA's Emergency Planning and
Community Right-to-Know Hotline at (800) 424-9346, or on the
Internet at < epa.gov/swercepp/ >.
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