Minnesota Administrative Rules
Agency 151 - Labor and Industry Department
Chapter 5225 - BOILERS AND BOATS
BOILER SAFETY
Part 5225.4700 - COMMON MAIN CONNECTION

Universal Citation: MN Rules 5225.4700
Current through Register Vol. 49, No. 13, September 23, 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.

Statutory Authority: MS s 175.171; 183.42; 183.44; 183.465; 183.466; 183.54; 326B.958; 326B.964; 326B.966; 326B.982

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