North Dakota Administrative Code
Title 33.1 - Department of Environmental Quality
Article 33.1-14 - NORTH DAKOTA BOILER RULES
Chapter 33.1-14-05 - POWER BOILERS - EXISTING INSTALLATIONS
Section 33.1-14-05-20 - Water columns, gauge glasses, and gauge cocks

1. Outlet connections (except for damper regulator, feedwater regulator, low-water fuel cutoff, drains, steam gauges, or such apparatus that does not permit the escape of an appreciable amount of steam or water therefrom) may not be placed on the piping that connects the water column to the boiler. The water column must be placed on the piping that connects the water column to the boiler. The water column must be provided with a valved drain of at least three-quarter inch [19.05 millimeter] pipe size, the drain to be piped to a safe location.

2. Each boiler constructed prior to 1999 must have three or more gauge cocks located within the visible length of the water glass, except when the boiler has two water glasses located on the same horizontal lines. Boilers not over thirty-six inches [.914 meters] in diameter, in which the heating surface does not exceed one hundred square feet [9.29 square meters] need have but two gauge cocks.

3. For all installations where the water gauge glass or glasses are more than thirty feet [9.14 meters] from the boiler operating floor, it is recommended that water level indicating or recording gauges be installed at eye height from the operating floor.