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Are Metal Hose assemblies compliant for LPG Applications? July 01, 2013

The governing body for the transfer of Liquefied Petroleum Gas (LPG) is The National Fire Protection Association (NFPA). The NFPA code number 58 mandates that all LPG hose assemblies must be manufactured to UL-21 specifications. UL-21 Section 3.1 describes the hose construction as follows: “The tube or lining of a hose shall be made from synthetic rubber of the oil-resistant type.” The use of the word “shall” requires the use of rubber tubing and eliminates the possibility of using metal hose in LPG Service.

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Discussion: Are Metal Hose Assemblies compliant for NH3 Applications? July 01, 2013

The DOT and PHMSA has jurisdiction for the loading, storage (incidental to transportation), transporting and loading / unloading of NH3. Both the DOT and the PHMSA are silent on the specific requirements for the material used in the manufacturing of the delivery hose for ammonia.

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