New York Codes, Rules and Regulations › Title 12 - DEPARTMENT OF LABOR › Chapter I - Industrial Board Of Appeals › Subchapter A - The Industrial Code › Part 14 - Construction, Installation, Inspection And Maintenance Of High Pressure Boilers; Construction Of Unfired Pressure Vessels › Subpart 14-9 - Power Boilers: New Installations › Water Level Indicators › Section 14-9.16 - Water gage glasses

Current through Register Vol. 46, No. 28, July 10, 2024
(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.