Section R. 408.11291 - Acetylene generators; marking; pressure limitsRule 1291.
(1) An acetylene generator shall be of approved construction and permanently marked with the following information:(a) Manufacturer's name and address.(b) Name or model number of the generator.(c) Capacity in cubic feet per hour.(d) Weight and size of carbide of a single charge.(2) The carbide used shall be not more than that marked on the acetylene generator and the rated capacity shall not be exceeded. Unless the generator is especially rated higher, a carbide feed generator shall not be rated at more than 1 cubic foot per hour per single charge.(3) A relief valve for a generating chamber shall be set to open at a pressure of not more than 15 psig (103 kPa gage). A relief valve for a hydraulic back pressure valve shall be set to open at a pressure of not more than 20 psig (137.4 kPa gage).(4) A nonautomatic generator used for generating acetylene shall be set to operate at a pressure of not more than 1 psig (.687 kPa gage) and all water overflows shall be visible.(5) An acetylene generator shall be so located that there will be unobstructed space around it to operate the machine without interference to or from other machines or employees and to permit adjustment and charging.Mich. Admin. Code R. 408.11291