Fittings shall be black, malleable iron or steel. Fittings adjacent to
valves shall suit valves specified. Reducing fittings shall be used for
changes in pipe sizes. In horizontal steam lines, reducing fittings shall
be the eccentric type to maintain the bottom of the lines at the same level.
2.6.1.2
Condensate Return Piping and Fittings
Piping shall be black steel, extra strong weight, conforming to ASTM A 53/A
53M, Grade A. Fittings shall be cast iron or malleable iron, extra heavy.
2.6.1.3
Vent Piping and Fittings
Piping shall be black steel, conforming to ASTM A 53/A 53M, Grade A.
Fittings shall be black malleable iron to suit piping. Plastic materials
polyetherimide (PEI) and polyethersulfone (PES) are forbidden to be used
for vent piping of combustion gases.
2.6.1.4
Gauge Piping
Piping shall be copper tubing, Type K or L, for steam and condensate 170
kPa 25 psig and less and steel for greater than 170 kPa 25 psig.
2.6.2
Joints
Except as otherwise specified, fittings used on steel pipe shall be
threaded for fittings 25 mm 1 inch and smaller; threaded or welded for
fittings 32 mm 1-1/4 inches up through 65 mm 2-1/2 inches; and flanged or
welded for fittings 80 mm 3 inches and larger. Joints between sections of
copper tubing or pipe shall be flared or sweated. Pipe and fittings 32 mm
1-1/4 inches and larger and installed in inaccessible conduits or trenches
beneath concrete floor slabs shall be welded. Unless otherwise specified,
connections to equipment shall be made with black malleable iron unions for
pipe 65 mm 2-1/2 inches or smaller in diameter, and with flanges for pipe
80 mm 3 inches or more, in diameter.
2.6.2.1
Bellows-Type Joints
Joints shall be flexible, guided type. Expansion element shall be
stainless steel. Joints shall be in accordance with the applicable
requirements of EJMA Stds and ASME B31.1 with internal liners.
2.6.2.2
Flexible Ball Joints
Joints shall be constructed of stainless steel, malleable iron, ductile
iron, carbon steel, bronze, or other alloys as appropriate for the service
intended.
2.6.2.3
Dielectric Waterways and Flanges
Dielectric waterways shall conform to the tensile strength and dimensional
requirements specified in ASME B16.39. Waterways shall have metal
connections on both ends suited to match adjacent piping. Dielectric
waterways shall be internally lined with an insulator specifically designed
to prevent current flow between dissimilar metals. Dielectric waterways
shall have pressure and temperature rating equal to or greater than that
specified for the connecting piping. Dielectric flanges shall meet the
performance requirements described herein for dielectric waterways.
SECTION 15562A
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