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 › Fittings and Appliances › Section 14-9.33 - Feedwater valves

Current through Register Vol. 46, No. 28, July 10, 2024
(a) The
						feedwater piping for all boilers, except for high temperature water boilers
						complying with the requirements of subdivision (h) of this section, and for
						forced flow steam generators with no fixed steam and water line complying with
						the requirements of subdivision (i) of this section, shall be provided with a
						check valve and a stop valve or cock between the check valve and the boiler.
						The stop valve or cock shall comply with the requirements of ASME.
(b) The relative locations of the check and
						stop (or cock) valves, as required in subdivision (a) of this section, may be
						reversed on a single boiler-turbine unit installation.
(c) If a boiler is equipped with a duplicate
						feed arrangement, each such arrangement shall be equipped as required by these
						rules.
(d) When the supply line to
						a boiler is divided into branch feed connections and all such connections are
						equipped with stop and check valves, the stop and check valves in the common
						source may be omitted.
(e) When two
						or more boilers are fed from a common source, there shall also be a globe or
						regulating valve in the branch to each boiler located between the check valve
						and the source of supply. A typical arrangement is shown in Figure P-44(a).
						Wherever globe style valves are used on feed piping, the inlet shall be under
						the disk of the valve.
(f) A
						combination stop and check valve in which there is only one seat and disk, and
						in which a valve stem is provided to close the valve, shall be considered only
						as a stop valve, and a check valve shall be installed as otherwise
						provided.
(g) Where an economizer
						or other feedwater heating device is connected directly to the boiler without
						intervening valves, the feed valves and check valves required shall be placed
						on the inlet of the economizer or feedwater heating device.
(h) The recirculating return line for a high
						temperature water boiler shall be provided with the same stop valve, or valves,
						required by subdivisions (a) and (c) of this section. The use of a check valve
						in the recirculating return line is optional. A check valve shall not be a
						substitute for a stop valve.
(i)
						The feedwater boiler external piping for a forced flow steam generator with no
						fixed steam and water line may terminate up to and including the stop valve(s)
						and omitting the check valve(s) provided that a check valve having a pressure
						rating no less than the boiler inlet design pressure is installed at the
						discharge of each boiler feed pump or elsewhere in the feedline between the
						feed pump and the stop valve(s).
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