Minn. R. agency 151, ch. 5225, BOILER SAFETY, pt. 5225.4800
Each boiler must have a bottom blowoff pipe fitted with a valve or cock in direct connection with the lowest water space practicable.
All fittings between the boiler and valves must be of steel for pressure over 100 pounds per square inch.
For pressures up to 200 pounds per square inch cast iron valves may be used if they meet the requirements of Section I of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code, which adopts the American National Standards Institute Standard for 250 pounds; and if of steel must be equal to the requirements of Section I of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code, which adopts the American National Standards Institute Standard. For pressures over 200 pounds per square inch the valves or cocks must be of steel and at least equal to the requirements of Section I of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code which adopts the American National Standards Institute Standard.
Minn. R. agency 151, ch. 5225, BOILER SAFETY, pt. 5225.4800
Statutory Authority: MS s 175.171; 183.42; 183.44; 183.465; 183.466; 183.54; 326B.958; 326B.964; 326B.966; 326B.982