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BACK-UP RINGS

Ductile Iron Back-Up Ring D.I.P.S.

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

4"
BU04DIPS
9.0
0.94
4.9
7.50
8
0.750
5.2

6"
BU06DIPS
11.0
1.00
7.00
9.50
8
0.875
7.3

8"
BU08DIPS
13.5
1.12
9.13
11.75
8
0.875
11.1

10"
BU10DIPS
16.0
1.19
11.25
14.25
12
1.000
18.7

12"
BU12DIPS
19.0
1.25
13.37
17.00
12
1.000
27.3

16"
BU16DIPS
23.5
1.88
17.59
21.25
16
1.125
36.6

18"
BU18DIPS
25.0
1.75
19.70
22.75
16
1.250
46.0

20"
BU20DIPS
27.5
2.06
21.85
25.00
20
1.250
58.0

24"
BU24DIPS
32.0
2.13
26.05
29.50
20
1.375
75.0

Dimensions are in inches.

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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