be properly supported and connected. Except for thermostatic traps in pipe
coils, radiators, and convectors, install traps with a dirt pocket and
strainer between trap and piping or apparatus it drains. When it is
necessary to maintain in continuous service, apparatus or piping which is
to be drained, provide a three valve bypass so that trap may be removed and
repaired and condensate drained through the throttled bypass valve.
Provide a check valve on the discharge side of the trap when trap is
installed for lift or operating against a back pressure, or trap discharges
into a common return line. Provide test connections on the discharge side
of the high and medium pressure traps when specifically required. Test
connection shall include a 1/2-inch globe valve with open blow.
3.1.2.16
Pressure Gage Installation
Provide with a shutoff valve or petcock between the gage and the line, and
provide gage on steam lines with a siphon installed ahead of the gage.
3.1.2.17
Thermometers and Thermal Sensing Element of Control Valves
Provide 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.
3.1.2.18
Strainer Locations
Provide strainers with meshes suitable for the services upstream of each
control valve and where dirt might interfere with the proper operation of
valve parts, orifices, or moving parts of equipment.
3.1.2.19
Dissimilar Piping Materials
Provide dielectric unions or flanges between ferrous and nonferrous piping,
equipment, and fittings, except that bronze valves and fittings may be used
without dielectric couplings for ferrous-to-ferrous or
nonferrous-to-nonferrous connections. Dielectric fittings shall utilize a
nonmetallic filler which will prevent current flow from exceeding one
percent of the short circuit current. Spacer shall be suitable for
pressure and temperature of the service. Fittings shall otherwise be as
specified in this section.
3.1.2.20
Surface Treating, and Pipe Wrapping
Uninsulated steel piping buried in the ground shall have exterior surfaces
protected with a tape wrapping system or a continuously extruded
polyethylene coating system as specified in Section 09974 PROTECTION OF
BURIED STEEL PIPING AND STEEL BULKHEAD TIE RODS.
3.1.3
PAINTING
3.1.3.1
Piping, Fittings, and Mechanical and Electrical Equipment
Equipment shall be factory finished to withstand the intended end use
environment in accordance with the specifications for particular end item.
Retouch damaged areas on factory finished equipment on which finish has
been damaged and then give a complete finish coat to restore finish to
original condition. Finish coat shall be suitable for exposure in the
intended end use environment.
SECTION 15501N
Page 153
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