Steam Pressure-Reducing Valves

3.1.2.3

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NOTE: The designer shall ensure that safety valves

are installed for proper personnel protection. Vent

piping shall be sized to minimize back pressure.

The pipe sizes and the method of termination shall

be shown on the drawings.

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NOTE: The bypass valves shall be located in bypass

piping. The valve and piping shall be sized to

restrict the capacity to approximately that of the

reducing valve and the sizes shall be indicated on

the drawings.

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NOTE: Provide a drip trap upstream of the pressure

reducing valve to preclude the build-up of

condensate and potential water hammer through the

valve and downstream piping.

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Provide the steam line entering each pressure-reducing valve with a

strainer. Provide each pressure-reducing valve unit with two cutout valves

and with a globe or angle bypass valve and bypass piping. Provide each

pressure-reducing valve unit with an indicating steam gage to show the

reduced pressure, and a safety valve on the low pressure side with

sufficient capacity to relieve the high pressure steam.

3.1.2.4

Valves for Radiators

Install a radiator valve on each radiator.

3.1.2.5

Safety Valves

Provide with drip pan elbows.

3.1.3

Pressure Gages

Install a shutoff valve or petcock between each pressure gage and the line,

and gages on steam lines shall have a syphon installed ahead of the gage.

3.1.4

Thermometers

Provide thermometers and thermal sensing elements of control valves with a

separable socket. Install separable sockets in pipe lines in such a manner

to sense the temperature of the flowing fluid and minimize obstruction to

flow.

3.1.5

Steam Meters

Provide steam meters with a suitable three-valve bypass to permit

dismantling and inspection without interference with the service.

3.1.6

Strainers

Provide strainers with meshes suitable for the services where indicated,

SECTION 15183N

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