N.D. Admin Code 33.1-14-09-20 - Bottom blowoff and drain valves

1. Each steam boiler having a capacity over twenty-five gallons [94.6 liters] must have a bottom blowoff connection fitted with a valve or cock connected to the lowest water space practicable with a minimum size as shown below:

Minimum Required Safety Valve Capacity in Pounds of Steam/Hour	Steam Boiler Blowoff Piping Valve Size, Inches (Min.)
Up to 500	3/4
501 to 1,250	1
1,251 to 2,500	1 1/4
2,501 to 6,000	1 1/2
6,001 and larger	2

2. Each hot water boiler and each steam boiler having a capacity not exceeding twenty-five gallons [94.6 liters] must have a drain valve connected to the lowest water space practicable. The minimum size of this drain valve is three-quarter inch [1.9 centimeters].

Notes

N.D. Admin Code 33.1-14-09-20

Adopted by Administrative Rules Supplement 2020-377, July 2020, effective 7/1/2020.

General Authority: NDCC 23.1-16

Law Implemented: NDCC 23.1-16