Pipe Clamps Homepage > Fig. 190 - Fabricated Riser Clamp

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FIG. 190 Pipe Clamp

SERVICE:
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.

METHODS OF SELECTION:
  1. Determine total load to be supported and service temperature of the piping system.
  2. Refer to "CHART A" and determine the temperature correction factor for the clamp material being used.
  3. Multiply total load by the correction factor to obtain a corrected load.
  4. 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.
  5. The bolt diameter is obtained by using the uncorrected total load and referring to "CHART B".
HOW TO ORDER:
Specify pipe outside diameter, total load, design temperature, material and dimension "D" or center to center of hanger rods.

NOTE:
Pipe clamp can be fabricated to any specified material.

CHART A - STRESS-TEMPERATURE CORRECTION FACTORS
Material Specification
       
DESIGN TEMPERATURE °F
         
ASTM
GRADE
650
700
750
800
850
900
950
1000
1050
1100
1150
1200
A 36
-
0.80
0.83
0.89
1.06
-
-
-
-
-
-
-
-
A . 387
11
0.66
0.66
0.66
0.66
0.69
0.76
0.91
1.53
-
-
-
-
A . 387
22
0.66
0.66
0.66
0.66
0.69
0.76
0.91
1.28
1.72
2.38
-
-
A . 240
304
0.94
0.95
0.96
0.97
0.99
1.00
1.02
1.02
1.11
1.21
1.45
1.81
 
CHART B - CLAMP SPACING AND BOLT SIZES
Uncorrected Total Load lb.
3,400
4,700
6,200
8,000
10,000
12,000
16,000
19,000
25,000
32,000
40,000
55,000
67,000
82,000
96,000
118,000
135,000
154,000
BOLT - B
5/8
3/4
7/8
1
1 1/8
1 1/4
1 3/8
1 1/2
1 3/4
2
2 1/4
2 1/2
2 3/4
3
3 1/4
3 1/2
3 3/4
4
BOLT - C
-
-
-
3/4
7/8
1
1
1 1/8
1 3/8
1 1/2
1 3/4
2
2
2 1/4
2 1/2
2 3/4
3
3
SPACE - S
7/8
1
1 1/4
1 1/2
1 1/2
1 3/4
1 7/8
2 1/4
2 1/4
2 1/2
3
3 1/4
3 1/2
4
4
4 1/4
4 1/2
4 3/4
 
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