2.4
PIPE, FITTINGS AND END CONNECTIONS (JOINTS)
2.4.1
Steel Pipe
Steel pipe for refrigerant service shall conform to ASTM A 53/A 53M,
Schedule 40, Type E or S, Grades A or B. Type F pipe shall not be used.
2.4.1.1
Welded Fittings and Connections
Butt-welded fittings shall conform to ASME B16.9. Socket-welded fittings
shall conform to ASME B16.11. Welded fittings shall be identified with the
appropriate grade and marking symbol. Welded valves and pipe connections
(both butt-welds and socket-welds types) shall conform to ASME B31.9.
2.4.1.2
Threaded Fittings and Connections
Threaded fitting shall conform to ASME B16.3.
Threaded valves and pipe
connections shall conform to ASME B1.20.1.
2.4.1.3
Flanged Fittings and Connections
Flanges shall conform to ASME B16.5, Class 150. Gaskets shall be
nonasbestos compressed material in accordance with ASME B16.21, 1.59 mm
(1/16 inch) 1/16 inch thickness, full face or self-centering flat ring
type. This gaskets shall contain aramid fibers bonded with styrene
butadeine rubber (SBR) or nitrile butadeine rubber (NBR). Bolts, nuts, and
bolt patterns shall conform to ASME B16.5. Bolts shall be high or
intermediate strength material conforming to ASTM A 193/A 193M.
2.4.2
Steel Tubing
Tubing shall be cold-rolled, electric-forged, welded-steel in accordance
with ASTM A 334/A 334M, Grade 1. Joints and fittings shall be socket type
provided by the steel tubing manufacturer.
2.4.3
Copper Tubing
Copper tubing shall conform to ASTM B 280 annealed or hard drawn as
required. Copper tubing shall be soft annealed where bending is required
and hard drawn where no bending is required. Soft annealed copper tubing
shall not be used in sizes larger than 35 mm (1-3/8 inches) 1-3/8 inches.
Joints shall be brazed except that joints on lines 22 mm (7/8 inch) 7/8 inch
and smaller may be flared. Cast copper alloy fittings for flared copper
tube shall conform to ASME B16.26 and ASTM B 62. Wrought copper and bronze
solder-joint pressure fittings shall conform to ASME B16.22 and ASTM B 75M
ASTM B 75. Joints and fittings for brazed joint shall be wrought-copper or
forged-brass sweat fittings. Cast sweat-type joints and fittings shall not
be allowed for brazed joints. Brass or bronze adapters for brazed tubing
may be used for connecting tubing to flanges and to threaded ends of valves
and equipment.
2.4.4
Solder
Solder shall conform to ASTM B 32, grade Sb5, tin-antimony alloy for
service pressures up to 1034 kPa 150 psig. Solder flux shall be liquid or
paste form, non-corrosive and conform to ASTM B 813.
SECTION 15182
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