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Stanford University
Environmental Health and Safety |
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| Restricted Flow Orifices |
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All gas cylinders with TGO
Class I gases (except for lecture bottles) having
a vapor pressure greater than 29 psia shall have a restricted flow
orifice (RFO -- also called a flow-restricting orifice), if available,
installed. If a RFO is not available, the cylinder shall be used with
a flow-limiting device. Other gas cylinders with TGO gases may require
the installation of a RFO to treat gas releases to less than the IDLH.
Below are pictures and a drawing of a compressed gas valve showing
the location of the restricted flow orifice. |
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