Minnesota Administrative Rules

5225.4900 BLOWOFF PIPING.

On all stationary boilers, when the allowable working pressure exceeds 100 pounds per square inch, each bottom blowoff pipe must have two slow-opening valves, or one slow-opening valve and a quick-opening valve or a cock complying with Section VII of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code. The quick-opening valve, if used, must be located nearest the boiler.

The bottom blowoff pipes of every traction and/or portable boiler must have at least one slow-or-quick-opening blowoff valve or cock conforming to the American Society of Mechanical Engineers Boiler and Pressure Vessel Code Section VII requirement.

Blowoff valves and cocks must be located in a convenient and accessible place, using extension valve stems if necessary to secure safe operation.

Statutory Authority:

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

History:

13 SR 1917; 19 SR 591; L 2007 c 140 art 9 s 27; art 13 s 4

Published Electronically:

February 19, 2009