in any case.
3.1.8.4
Flexible Ball Joints
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NOTE: Ball joints may often be used to advantage
instead of loops and expansion joints. Where used,
they must be indicated on plans in detail. Guides
for ball joints will be as recommended by the
manufacturer. Design details will include dimension
between ball center-points in offset leg, and the
distance and direction of desired cold set from
offset leg centerline. Each expansion unit will
consist of two, three, or four joints, but in no
case less than two joints, as required to handle the
system expansion. The ball joint arrangement at
each expansion location must provide for total
movement.
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Flexible ball joints may be threaded, flanged, or welded end as required,
and shall be capable of absorbing the normal operating axial, lateral, or
angular movements or combination in accordance with ASME B31.1, and ASME
BPVC SEC VIII D1 where applicable. Flanges shall conform to the diameter
and drilling of ASME B16.5. Molded gaskets furnished shall be suitable for
the service intended.
3.1.9
Valves and Equipment
Valves shall be installed at the locations shown, where specified, and
where required for the proper functioning of the system as directed. Gate
valves shall be used unless otherwise shown, specified, or directed.
Valves shall be installed with their stems horizontal or above. Valves
used with ferrous piping shall have threaded or flanged ends for ferrous
piping and sweat-type connections for copper tubing.
3.1.9.1
Thermometer Socket
A thermometer well shall be provided in each return line circuit in
multicircuit systems.
3.1.9.2
Radiator Valves
An automatic or manual control valve and a 6 mm 1/8 inch air valve shall be
installed on each radiator and convector. Control valve shall be the same
size as supply connection. Ten keys for air valves shall be delivered to
the Contracting Officer. A fully automatic type air vent may be furnished
for convectors in lieu of the manual air valves specified.
3.1.9.3
Steam Air Vents
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NOTE: Indicate location of all air vents on the
drawings. Details for vents shall be indicated on
the drawings.
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Vents shall be installed where indicated. Discharge pipes from the vent
shall be run to a point as indicated. Vent shall be a quick-acting valve
SECTION 15562A
Page 37
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