Minn. R. agency 151, ch. 5225, BOILER SAFETY, pt. 5225.4700
Current through Register Vol. 49, No. 24, December 9, 2024
When two or more boilers are connected to a common steam main, the steam connection from each boiler having a manhole opening must be fitted with two stop valves having an ample free-blow drain between them. The stop valves installed on high pressure steam boilers must consist of either one automatic nonreturn valve, set next to the boiler and a second valve of the outside-screw-and-yoke type; or two valves of the outside-screw-and-yoke type. The free blow drain must ensure complete removal of all condensate and steam from between the two stop valves.
Minn. R. agency 151, ch. 5225, BOILER SAFETY, pt. 5225.4700
Statutory Authority: MS s 175.171; 183.42; 183.44; 183.465; 183.466; 183.54; 326B.958; 326B.964; 326B.966; 326B.982