Fittings

Flange/Stub-end

Polyethylene flange adaptors/ stub-ends are used to connect HDPE pipes together or to connect to other piping equipment. The PE flange adaptor is fused to the pipe and then joined to a similar PE flange or its matching flange of unlike material. It is joined by using bolts and back-up metal rings.

 
  • Stub-ends /Flange adapters can be fused to the same DR or to the one standard higher DR. (i.e.,DR-17 to DR-21)
  • The sealing surface of the stub-end/ flange adapter is serrated to provide a better sealing surface and hold the gasket in place.
  • Gasket material must be well-matched with the inner fluid and outer environment at service conditions. For choosing the right thickness, hardness, material and style check with gasket manufacturer.
     

 

d1
mm
d3
mm
d4
mm
h1 (mm)
r1
r2
Z
mm
SDR41 SDR33 SDR26 SDR21 SDR17.6 SDR17 SDR13.6 SDR11
400
400
427
482
-
26
26
-
33
-
-
46
6
20
150
450
450
514
585
-
33
38
-
46
-
-
60
6
20
150
500
500
530
585
-
33
38
-
46
-
-
60
6
20
150
560
560
615
685
-
35
40
-
50
-
-
60
6
20
150
630
630
642
685
-
35
40
-
50
-
-
60
6
20
150
710
710
737
800
30
36
40
45
50
52
65
70
8
20
160
800
800
840
905
30
36
42
47
52
55
70
-
8
20
160
900
900
944
1005
33
40
46
50
55
60
75
-
8
20
170
1000
1000
1047
1110
36
42
50
55
60
65
-
-
8
20
170
1200
1200
1245
1330
40
50
60
80
90
-
-
-
8
20
170
1400
1400
1440
1560
62
78
100
-
-
-
-
-
10
20
240
1600
1600
1640
1760
75
92
115
-
-
-
-
-
12
20
240

 

  • P.E.S supply metal back-up ring based on DIN 2501 or other international standards by customer demand and regarding service conditions.

 

  • The back-up metal ring is placed at the back of the flange adaptor/ stub end sealing surface before welding in order to provide a uniform pressure around the sealing surface and forbid the leakage through the bolts area.

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