shall conform to ASME B16.5. Steel pipe flanges shall be forged steel.
Flanged fittings shall be cast steel. Steel flanges and fittings shall be
of the same material and schedule as the pipe to which they connect.
Flanges shall be provided with carbon steel bolts and nuts conforming to
ASTM A 307, Grade B. Bolts and nuts shall have hexagonal heads. Gaskets
shall be heavy-duty Buna-N 1.59 mm 1/16 inch thick, full-faced, punched for
bolts and pipe opening as required. Fittings shall conform to ASME B16.9
except that cast fittings are not acceptable. Butt-welded fittings shall
be of the same material and schedule as the pipe to which they connect.
Fittings shall be clean and free of all oxides, slag, and other impurities
or foreign matter. Backing rings shall be split-ring type with knock-off
spacer nubs.
2.10.2.4
Pipe Hangers
Pipe hanger assemblies, anchors and sway braces shall be designed by the
hanger manufacturer and the Contractor in accordance with ASME B31.1, MSS
SP-58, MSS SP-69 and as follows: (a) Make weight and moment balance
calculations to determine the required supporting force on each hanger and
the reaction on equipment, (b) design supports so that the spacing does not
exceed that given in Table 121.1.4, ASME B31.1 Power Piping Code, except in
the center spans of straight runs where the spacing may be increased 20
percent, (c) design the first rigid hanger in a system so that the
restraining action of the hanger produces a bending stress no greater than
1/4th of the allowable stress listed in Appendix A of the Power Piping
Code, (d) design supports at concentrated load so as to prevent excessive
bending moments in system, (e) design for Seismic Zone [_____] in
accordance with Section 15070N MECHANICAL SOUND VIBRATION AMD SEISMIC
CONTROL, (f) design supports and hanger such that the resultant reactions
imposed on the equipment connections due to the weight of the piping system
does not exceed a resultant force of plus or minus 45.4 kg 100 lbs or a
resultant moment of plus or minus 671 meters per kg 1,000 feet per pound,
and (f) provide spring supports in accordance with the following:
Maximum Vertical
Movement
MSS SP-69 Type
6.35 mm
51SS, 52SS, 53SS
12.70 mm
51S, 52S, 53S
25.40 mm
51LS, 52LS, 53LS
Over 25.40 mm
54, 55, 56
Maximum Vertical
Movement
MSS SP-69 Type
1/4 inch
51SS, 52SS, 53SS
1/2 inch
51S, 52S, 53S
1 inch
51LS, 52LS, 53LS
Over 1 inch
54, 55, 56
Hanger assemblies shall use the following materials in construction:
a.
Hanger rods shall be hot-rolled carbon steel cut to length and
threaded in the factory. (Continuous threaded rods are not
acceptable).
b.
Pipe clamps shall be carbon steel.
c.
Clevises, turnbuckles, and eye nuts shall be forged steel.
SECTION 15864N
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