Guided, slip-tube expansion joints shall conform to EJMA Stds and ASME B31.1.
End connections shall be flanged. Anchor bases or support bases shall be
provided as indicated or required. The joints shall be designed for a
steam working pressure not less than [_____] Pa psig. Joints shall provide
for either single or double slip of the connected pipes, as indicated, and
for not less than the traverse indicated. [Service outlets shall be
provided where indicated or required.]
2.26.6.2
Bellows Type Expansion Joints
Bellows type joints shall be flexible, guided expansion joints conforming
to EJMA Stds and ASME B31.1. The expansion element shall be stainless
steel. Guiding of piping on both sides of expansion joint shall be in
accordance with the published recommendations of the manufacturer of the
expansion joint. The joints shall be designed for the working temperature
and pressure suitable for the application, but design pressure shall not be
less than 1.03 MPa 150 psig.
2.26.6.3
Flexible Ball Type Expansion Joints
Flexible ball joints shall be [stainless steel] [malleable-iron] [ductile
iron] [carbon steel] [bronze] or other alloys as appropriate for the
service intended. The 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 thereof. The ball-type joint
shall be designed and constructed in accordance with ASME B31.1 and EJMA
Stds, where applicable. Flanges shall conform to the diameter and drilling
provisions of ASME B16.5. Molded gaskets furnished shall be suitable for
the service intended.
2.26.7
Valves
Valves shall be installed at indicated locations, where specified, and
where required for proper functioning and servicing of the system. Valves
shall be of the pressure class shown. Motor-operated valves shall be
capable of closing speeds of 2.5 to 5.1 mm/sec 6 to 12 inches per minute.
Motor operators shall be equipped with position indicators, valve stem
protectors above the motor operating units, and auxiliary handwheels for
manual operation of the valves in the event of power failure. Motors shall
be suitable for operation on the electrical current characteristics
indicated.
2.26.7.1
Check Valves
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NOTE: The designer shall indicate the type of
valves, vertical lift or horizontal, on the drawings.
**************************************************************************
a.
Valves for 125 pound class steel piping shall conform to the
following:
(1) Sizes 65 mm 2-1/2 inches and less, bronze:
MSS SP-80, Type 3
or 4, Class 125.
(2) Sizes 80 mm 3 inches through 600 mm 24 inches, cast-iron:
MSS SP-71, Type III or IV, Class 125.
SECTION 15559A
Page 74
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