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1313.3 Connection of Portable and Mobile Industrial Appliances
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Where portable industrial appliances or appliances
requiring mobility or subject to vibration, are connected
to the building gas piping system by the use of a flexible hose,
the hose shall be approved and safe for the conditions under
which it is used. [NFPA 54:9.6.3.1]
Where industrial
appliances requiring mobility are connected to the rigid
piping by the use of swivel joints or couplings, the swivel
joints or couplings shall be approved for the service
required, and the minimum number required shall be
installed. [NFPA 54:9.6.3.2]
Where industrial
appliances subject to vibration are connected to the
building piping system by the use of metal flexible
connectors, the connectors shall be approved for the
service required. [NFPA 54:9.6.3.3]
Where flexible connections
are used, they shall be of the minimum practical length and shall not extend from one room to another or
pass through walls, partitions, ceilings, or floors. Flexible
connections shall not be used in a concealed location.
They shall be protected against physical or thermal
damage and shall be provided with gas shutoff valves in
readily accessible locations in rigid piping upstream from
the flexible connections. [NFPA 54:9.6.3.4]
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