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BACK-UP RINGS

Ductile Iron Back-Up Ring I.P.S. FM Class 150

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Size
Part
Number
Outer
Diam.
(OD)
Thickness
(t)
Inside
Diam.
(ID)
Diam.
of  Bolt
Circle
(BC)
#
Bolt     
Holes
Min.
Diam.
of Bolt
Holes
(D)
WT

2"
BU02C150FM
6.0
0.75
2.63
4.75
4
0.750
2.4

3"
BU03C150FM
7.5
0.94
3.75
6.00
4
0.750
3.9

4"
BU04C150FM
9.0
0.94
4.75
7.50
8
0.750
5.2

6"
BU06C150FM
11.0
1.00
6.88
9.50
8
0.875
7.3

8"
BU08C150FM
13.5
1.12
8.88
11.75
8
0.875
11.1

10"
BU10C150FM
16.0
1.19
11.00
14.25
12
1.000
18.7

12"
BU12C150FM
19.0
1.25
13.13
17.00
12
1.000
27.3

14"
BU14C150FM
21.0
1.38
14.38
18.75
12
1.125
36.1

16"
BU16C150FM
23.5
1.44
16.38
21.25
16
1.125
48.3

18"
BU18C150FM
25.0
1.56
18.38
22.75
16
1.250
48.8

All dimensions are in inches. Others sizes are available upon request.

Convoluted back-up rings, 150lb. conform to the vital dimensions of ANSI B16.5 such as outside diameter, bolt circle, bolt hole number and size.

*The term "convoluted" refers to the cross-sectional shape of the ring. The shape allows the usage of less material, which affects its original cost as well as shipping and handling cost. Earlier style back-up rings are available upon request.

Will mate with:

  • Forged steel flanges, Class 150 per ANSI B16.5
  • Plate steel flanges, Class 150 lb. Per AWWA C207
  • Cast iron flanges, 125 lb. Per ANSI B16.1
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