Minn. R. agency 151, ch. 5225, BOILER SAFETY, pt. 5225.4400
For steam boilers the steam gages must meet the requirements of Section I for high pressure boilers, and section IV for low pressure boilers of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code to correctly record pressure.
Each steam gage must be connected to a siphon of at least one-fourth inch pipe size and be fitted with a valve provided with a tee or lever handle arranged to be parallel to the pipe in which it is located when the valve is open. If the pipe is longer than ten feet, a shutoff valve or valve arranged so that it can be locked or sealed open may be used near the boiler.
The dial of the steam gage must be graduated to approximately double the pressure at which the safety valve is set but in no case to less than 1-1/2 times this pressure.
Minn. R. agency 151, ch. 5225, BOILER SAFETY, pt. 5225.4400
Statutory Authority: MS s 175.171; 183.42; 183.44; 183.465; 183.466; 183.54; 326B.958; 326B.964; 326B.966; 326B.982