indicated, special flow fittings shall be installed on the mains to bypass
portions of the water through each radiator. Special flow fittings shall
be standard catalog products and shall be installed as recommended by the
manufacturer.
3.2.8.2
Branch Connections for Steam Systems
Branches shall be taken from the supply mains at an angle of 45 degrees
above the horizontal, unless otherwise indicated. The branches from return
mains shall be taken from the top or sides, unless indicated otherwise.
Branches shall pitch up from the mains toward the undripped risers or
radiator connections with a grade of not less than 8 mm in 1 m 1 inch in 10
feet. Connections to ensure unrestricted circulation, eliminate air
pockets, and permit the complete drainage of the system.
3.2.9
Steam Connections to Equipment
**************************************************************************
NOTE: Delete this paragraph if steam connections
are not required.
**************************************************************************
Steam supply and return connections shall be provided as shown.
Connections shall be made with malleable-iron unions or with steel flanges,
to match equipment. Valves and traps shall be installed in accordance with
the manufacturer's recommendations. The size of the supply and return
pipes to each piece of equipment shall not be smaller than the outlets on
the equipment.
3.2.10
Steam Risers
**************************************************************************
NOTE: Delete this paragraph if steam risers are not
required.
**************************************************************************
The location of risers is approximate. The exact locations of the risers
shall be approved. Downfeed risers shall terminate in a dirt pocket and
shall be dripped through a trap to the return line.
3.2.11
Air Vents for Steam Systems
**************************************************************************
NOTE: Delete this paragraph if a steam system is
not utilized.
**************************************************************************
Automatic balanced pressure thermostatic air vents shall be installed at
the ends of the steam lines and where shown on the drawings. The vents
shall be rated for 862 kPa 125 psi steam service. The outlet of the vent
shall be routed to a point designated by the Contracting Officer's
Representative. The inlet line shall have a gate valve or ball valve.
3.2.12
Flared, Brazed, and Soldered Copper Pipe and Tubing
Copper tubing shall be flared, brazed, or soldered. Tubing shall be cut
square, and burrs shall be removed. Both inside of fittings and outside of
tubing shall be cleaned thoroughly with sand cloth or steel wire brush
before brazing. Annealing of fittings and hard-drawn tubing shall not
SECTION 15569A
Page 65
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