N.Y. Comp. Codes R. & Regs. Tit. 12 §§ 14-9.16

Current through Register Vol. 46, No. 53, December 31, 2024

Section 14-9.16 - Water gage glasses

(a) Each boiler, except forced-flow steam generators with no fixed steam and waterline, and high-temperature water boilers of the forced circulation type that have no steam and waterline, shall have at least one water gage glass. Boilers operated at pressures over 400 psi shall be provided with two water gage glasses which may be connected to a single water column or connected directly to the drum. Two independent remote level indicators may be provided instead of one of the two required gage glasses for boiler drum water level indication in the case of power boilers with all drum safety valves set at or above 900 psi. When both remote level indicators are in reliable operation, the remaining gage glass may be shut off, but shall be maintained in serviceable condition. When the direct reading of gage glass water level is not readily visible to the operator in his working area, two dependable indirect indications shall be provided, either by transmission of the gage glass image or by remote level indicators.

(b) The lowest visible part of the water gage glass shall be at least two inches above the lowest permissible water level, at which level there will be no danger of overheating any part of the boiler when in operation at that level. When remote level indication is provided for the operator in lieu of the gage glass, the same minimum level reference shall be clearly marked.

(c) Connections from the boiler to the remote level indicator shall be at least 3/4 inch pipe size to and including the isolation valve and from there to the remote level indicator at least 1/2 inch outside diameter tubing. These connections shall be completely independent of other connections for any function other than water level indication. For pressures of 400 psi or over, lower connections to drums shall be provided with shields, sleeves, or other suitable means to reduce temperature differentials in the shells or heads.

(d) Forced-flow steam generators with no fixed steam and waterline and the high-temperature water boiler of the forced circulation type require no water gage glass or gage cocks.

(e) Boilers of the horizontal firetube type shall be so set that when the water is at the lowest reading in the water gage glass there shall be at least three inches of water over the highest point of the tubes, flues, or crown sheets.

(f) The bottom mounting for water glass and for water column, if used, must extend not less than 11/2 inch inside the boiler and beyond any obstacle immediately above it, and the passage therein must be straight and horizontal.

(g) Tubular water glasses must be equipped with a protecting shield.

N.Y. Comp. Codes R. & Regs. Tit. 12 §§ 14-9.16