New York Codes, Rules and Regulations › Title 12 - DEPARTMENT OF LABOR › Chapter I - Industrial Board Of Appeals › Subchapter A - The Industrial Code › Part 4 - Low Pressure Boilers › Subpart 4-14 - Special Requirements For Cast-iron Boilers › Section 4-14.4 - Installation requirements

Current through Register Vol. 46, No. 28, July 10, 2024
(a)
Expansion and contraction.
Provision shall be made for the expansion and contraction
						of steam mains connected to boilers by providing substantial anchorage at
						suitable points, so that there shall be no undue strain transmitted to the
						boiler.
(b)
Feedwater.
When feedwater or makeup water is introduced from a
						pressure line, it shall be connected to the piping system and not directly to
						the boiler. Feedwater shall not be introduced through the opening or
						connections used for the relief valve, the water column, or the water gage
						glass.
(c)
Fluid-relief columns.
All hot water heating systems shall be so installed that
						there will be no opportunity for the fluid-relief column to freeze or to be
						accidentally shut off.
(d)
Expansion tanks.
If a hot water heating system is equipped with an open
						expansion tank, an indoor overflow from the upper portion of the expansion tank
						must be provided in addition to an open vent, the indoor overflow to be carried
						within the building to a suitable plumbing fixture or to the basement. If the
						system is of the closed type, an airtight tank or other suitable air cushion
						must be installed that will be consistent with the volume and capacity of the
						system. Provision must be made for draining the tank without emptying the
						system.
(e)
Return
					 pipe stop valves.
Where a stop valve is used in the supply pipe connection
						of a single boiler, there shall be one used in the return pipe connection
						unless a proper return loop is provided.
(f)
Stop valve requirements.
A stop valve shall be used in each supply and return pipe
						connection of two or more boilers connected to a common system. Provision shall
						be made for cleaning the interior of the return piping at or close to the
						boiler. When stop valves over two inches in size are used, they shall be the
						outside-screw-and-yoke rising-spindle type, or of such type as to indicate at a
						distance by the position of the spindle or other operating mechanism whether it
						is closed or open, and the wheel may be carried either on the yoke or attached
						to the spindle. If the valve is of the plug cock type, it must be fitted with a
						slow-opening mechanism and an indicating device, and the plug must be held in
						place by a guard or gland. When stop valves are used, they shall be properly
						designated substantially as indicated by the following tags of metal or other
						durable material fastened to them:
Supply Valve-Number ()
Return Valve-Number ()
Do Not Close Without Also
Do Not Close Without Also
Closing Return Valve-
Closing Supply Valve-
Number ()
Number ()
(g)
Connections for safety
					 valves.
The area of the openings shall be at least equal to the
						aggregate area based on the nominal diameters of all the safety valves with
						which it connects. A screwed connection may be used for attaching a safety
						valve.