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Support
Assembly Components
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Support
Assembly Components: Pipe Clamps and Risers
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FIG.
190 PIPE CLAMP
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SERVICE:
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In
situations where the use of a welded lug attachment would create an
undesirable crushing effect on the pipe wall, this clamp can transfer
the load from the pipe wall to the riser clamp by means of hold-down
lugs welded to the pipe.
Clamps may
be furnished in either Carbon or Alloy steel with bolting to suit, using
an allowable stress of 10,000 psi. Temperature correction factors listed
in "CHART A" are based on allowable stresses listed in
MSS-SP-58.
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METHODS OF
SELECTION:
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Determine
total load to be supported and service temperature of the piping system.
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Refer to
"CHART A" and determine the temperature correction factor for
the clamp material being used.
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Multiply
total load by the correction factor to obtain a corrected load.
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Refer to
"CHART C" and locate the point determined by the intersection
of the total load coordinate and the pipe size curve. Project this point
horizontally until it intersects with the "D" dimension
coordinate. Directly above this point is the required stock size.
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The bolt
diameter is obtained by using the uncorrected total load and referring
to "CHART B".
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| ORDERING: |
Specify pipe O.D., total load, design temperature, and dimension "D" OR
center to center of hanger rods, and material.
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| NOTE: |
Pipe clamp
can be fabricated to any specified material.
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CHART A -
STRESS-TEMPERATURE CORRECTION FACTORS
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Material
Specification
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DESIGN
TEMPERATURE °F
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ASTM
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GRADE
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650
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700
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750
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800
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850
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900
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950
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1000
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1050
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1100
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1150
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1200
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A 36
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-
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0.80
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0.83
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0.89
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1.06
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-
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-
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-
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-
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-
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-
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-
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-
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A . 387
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11
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0.66
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0.66
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0.66
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0.66
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0.69
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0.76
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0.91
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1.53
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-
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-
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-
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-
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A . 387
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22
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0.66
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0.66
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0.66
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0.66
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0.69
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0.76
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0.91
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1.28
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1.72
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2.38
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-
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-
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A . 240
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304
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0.94
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0.95
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0.96
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0.97
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0.99
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1.00
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1.02
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1.02
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1.11
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1.21
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1.45
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1.81
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CHART B -
CLAMP SPACING AND BOLT SIZES
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Uncorrected
Total Load lbs.
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3,400
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4,700
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6,200
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8,000
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10,000
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12,000
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16,000
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19,000
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25,000
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32,000
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40,000
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55,000
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67,000
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82,000
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96,000
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118,000
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135,000
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154,000
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BOLT - B
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5/8
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3/4
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7/8
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1
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1 1/8
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1 1/4
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1 3/8
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1 1/2
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1 3/4
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2
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2 1/4
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2 1/2
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2 3/4
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3
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3 1/4
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3 1/2
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3 3/4
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4
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BOLT - C
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-
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-
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-
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3/4
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7/8
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1
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1
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1 1/8
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1 3/8
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1 1/2
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1 3/4
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2
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2
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2 1/4
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2 1/2
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2 3/4
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3
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3
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SPACE - S
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7/8
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1
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1 1/4
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1 1/2
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1 1/2
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1 3/4
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1 7/8
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2 1/4
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2 1/4
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2 1/2
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3
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3 1/4
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3 1/2
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4
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4
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4 1/4
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4 1/2
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4 3/
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CHART C
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Product Index
