connections.
3.2.6
Connections for Future Equipment
Locate capped or plugged outlets for connections to future equipment as
indicated.
3.2.7
Changes in Pipe Size
Provide reducing fittings for changes in pipe size; reducing bushings are
not permitted. In horizontal lines, provide eccentric reducing fittings to
maintain the top of the lines in the same plane.
3.2.8
Cleaning of Pipe
Thoroughly clean each section of pipe, fittings, and valves free of foreign
matter before erection. Prior to erection, hold each piece of pipe in an
inclined position and tap along its full length to loosen sand, mill scale
and other foreign matter. For pipe 50 mm 2 inches and larger, draw wire
brush, of a diameter larger than that of the inside of the pipe, several
times through the entire length of pipe. Before making final connections
to apparatus, wash out interior of piping thoroughly with water. Plug or
cap open ends of mains during shutdown periods. Do not leave lines open
where foreign matter might enter the pipe.
3.2.9
Valves
Install valves in conformance with ASME B31.9. Provide gate valves unless
otherwise directed. Install valves with stems horizontal or above. Locate
or equip stop valves to permit operation from floor level, or provide with
safe access in the form of walkways or ladders. Install valves in
positions accessible for operation and repair.
3.2.9.1
Install globe valves so that the pressure is below the disk and the stem
horizontal.
3.2.9.2
Radiators Valves
Provide radiator valves on water inlet and balancing valves on water outlet
of terminal heating units such as radiation, unit heaters, and fan coil
unit.
3.2.9.3
Provide valves on pressure tanks, low pressure side of reducing valves,
heat exchangers, and expansion tanks. Select system relief valve so that
capacity is greater than make-up pressure reducing valve capacity. Select
equipment relief valve capacity to exceed rating of connected equipment.
Pipe relief valve outlet to the nearest floor drain.
3.2.10
Pressure Gage
Provide a shut-off valve or pet cock between pressure gages and the line.
3.2.11
Thermometers
Provide thermometers and thermal sensing elements of control valves with a
SECTION 15185N
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