Mich. Admin. Code R. 29.7091
Rule 91. Sections 2-13 to 2-13.6 of the storage and handling of gaseous and Liquefied H2 code are added as follows:
2-13 Hose and hose connections.
2-13.1 Hose shall be constructed of or lined with materials that are resistant to corrosion and compatible with H2.
2-13.2 Hose, metallic hose, flexible metal hose, tubing, and their connections shall be designed for the most severe pressures and temperatures expected under normal operating conditions with a burst pressure of at least 3 times the service pressure.
2-13.3 Prior to use, hose assemblies shall be tested by the manufacturer or its designated representative at a pressure at least 1.1 times the service pressure.
2-13.4 Hose and metallic hose shall be distinctly marked by the manufacturer either by the manufacturer's permanently attached tag or by distinct markings indicating the manufacturer's name or trademark, applicable service identifier and design pressure.
2-13.5 The use of hose in an installation shall be limited to the following:
2-13.6 Each section shall be so installed that it is protected against mechanical damage and is readily visible for inspection.
Mich. Admin. Code R. 29.7091