2.19.6
Copper Tube Joints and Fittings
Copper tube joints and fittings shall be flare joint type with short-shank
flare, or solder-joint pressure type. Joints and fittings for brazed joint
shall be wrought-copper or forged-brass sweat fittings. Cast sweat-type
joints and fittings will not be allowed for brazed joints.
2.20
PIPING AND FITTINGS, AMMONIA
At system application conditions to minus 6.7 degrees C 20 degrees F piping
system components including but not limited to piping, flanges, fittings,
valves, and all accessories including flange bolts, nuts, and bolt patterns
shall conform to ASME B31.5. Unions shall not be used in this piping
system. Other requirements are as follows:
2.20.1
Pipe, Black Carbon Steel
ASTM A 53/A 53M, Type E or S, Grade A or B, Schedule 40, standard weight,
or Schedule 80, or extra strong as required.
2.20.2
Fittings, Threaded
ASTM A 105/A 105M or ASTM A 181/A 181M and ASME B16.11, 2.07 MPa 3000 psig
WOG, forged steel.
2.20.3
Fittings, Welding
In sizes 25 mm 1 inch and under, ASTM A 105/A 105M or ASTM A 181/A 181M,
and ASME B16.11, 2.07 MPa 3000 psig WOG, forged steel, socket weld, bored
to match pipe wall thickness. Sizes exceeding 25 mm 1 inch shall be
wrought carbon steel, long radius, butt-weld, to match pipe wall thickness,
conforming to ASTM A 234/A 234M and ASME B16.9.
2.20.4
Fittings, Flanged
High strength gray cast iron conforming to ASTM A 126, Class B, or ASTM A
278/A 278M, Class 40, or malleable iron conforming to ASTM A 197/A 197M,
manufacturer's standard long radius. Flange configuration shall be as
specified for flanges.
2.20.5
Flanges
Forged carbon steel conforming to ASTM A 181/A 181M, with industry standard
tongue and groove face finish, 2-bolt oval shape in sizes 19 mm 3/4 inch
and under; 4-bolt square shape in sizes 25 mm 1 inch through 100 mm 4 inches;
round shape in sizes 127 mm 5 inches and larger; weld neck, except in sizes
50 mm 2 inches and under socket weld is acceptable. Threaded connection
flanges are not acceptable. Flange template dimensional and shape criteria
shall be identical and/or interchangeable with valve flanges specified in
paragraph VALVES, AMMONIA AND FLUOROCARBON.
2.21
VALVES, AMMONIA AND FLUOROCARBON
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NOTE: Construction of valves for ammonia service
should be stainless steel or ferrous based only.
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Valves shall be pressure and temperature rated for contained refrigerant
SECTION 15652A
Page 32
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