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 4-13 - Special Requirements For Low Pressure Steel Plate Boilers › Section 4-13.4 - Setting and installation

Current through Register Vol. 46, No. 28, July 10, 2024
(a)
Wet-bottom boilers.
Boilers of the wet-bottom type having an external width
						of over 36 inches shall have not less than 12 inches between the bottom of the
						boiler and floor line, with access for inspection. When the width is 36 inches
						or less, the distance between the bottom of the boiler and the floor line shall
						be not less than six inches, and when any part of the wet bottom is not farther
						from an outer edge than 12 inches it shall be not less than four inches. If
						handholes are located in the bottom area of the boiler, the bottom clearance
						for the boiler shall be not less than 12 inches regardless of width.
(b)
Access doors.
The minimum size of access doors used in a boiler setting
						shall be 12 inches by 16 inches, or equivalent area of which the least
						dimension is 11 inches.
(c)
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.
(d)
Feedwater.
Feedwater or makeup water shall not be discharged
						directly into any part of a boiler exposed to the direct radiant heat from the
						fire. Feedwater shall not be introduced through the openings or connections
						used for the relief valve, the water column, or the water gage glass.
(e)
Heaters.
A heater for oil or other liquid harmful to boiler
						operations shall not be installed directly in the steam or water space within a
						boiler. Where an external-type heater for such service is used, means shall be
						provided to prevent the introduction into the boiler of oil or other liquid
						harmful to boiler operation.
(f)
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.
(g)
Expansion tanks.
If the system is equipped with an open expansion tank, an
						indoor overflow from the upper portion of the expansion tank shall be provided
						in addition to an open vent, the indoor flow 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 shall be installed
						that will be consistent with the volume and capacity of the system. Provision
						shall be made for draining the tank without emptying the system.
(h)
Return pipe stop
					 valves.
When 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.
(i)
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 of 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.
(j)
Stop valve identification.
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 ()
(k)
Connections for safety
					 valves.
The area of the opening shall be at least equal to the
						aggregate area based on the nominal diameters of all of the safety valves with
						which it connects. A screwed connection may be used for attaching a safety
						valve.