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Metal Cased Polyurethane Seal

The metal cased polyurethane seal differs from the high pressure seal in that it comes with a metal case around its outer diameter. Except that difference, this hydraulic seal has almost all the same features as its cousin, including the metal reinforcements around the inner ring and the polyurethane sealing element.

Because the metal cased PU seal is to be fitted inside the steel pipe during a hydrostatic pressure test, the elastomeric body will expand outwards when being pressurized. This expansion pushes the metal case closely against the internal wall of the pipe, thereby forming a tight seal. The pressure-energized sealis cheap to manufacturer, a major advantage over the high pressure seal line. It is, however, equally suitable for sealing casing pipes, production tubing, and natural gas pipes during hydrostatic testing.

We currently offer more than 40 models of such static seals for customers to choose from, which are typically used to seal 97mm~762mm diameter steel pipes.

Applications
Steel casing pipes, oil production tubing, and other steel pipes certified to API 5CT/ISO11960:2011, GB/T9711.1-2011, and GB/T9711.2-2011 standards in oil and natural gas industry; GB8163-2008 seamless steel pipes; GB/T3092-2008 welded steel pipes
Working pressure ≤60 MPa
Working temperature: -20°C~+80°C
Operating media: water, hydraulic oil, emulsified fluid

Metal Cased Polyurethane Seal Schematic Diagram

Related Specs
No.
Type

Pipe diameter range

Groove Dimension

Order No.
Groove diameter
d
Metal case
diameter
D

Groove width
H+0.5
1 NM87 97-106 41 92 47 ZN116
2 NM91 101-111 41 96 47 ZN114
3 NM128 138-145 40 134 58.5 ZN155
4 NM136 146-156 70 141 47 ZN113
5 NM157 167-177 94 162 52 ZN110
6 NM163 173-183 94 168 52 ZN111
7 NM178 188-198 90 184 58.5 ZN148
8 NM183 195-205 120 190 52 ZN107
9 NM193 205-215 120 200 52 ZN108
10 NM198 210-220 140.5 205 38 ZN101
11 NM213 225-235 136 220 52 ZN102
12 NM217 229-239 136 224 52 ZN103
13 NM243 255-265 154 250 52 ZN106
14 NM270 282-292 180 227 52 ZN168
15 NM280 292-302 190 287 52 ZN169
16 NM310 322-332 227 317 52 ZN105
17 NM318 330-340 230 325 52 ZN152
18 NM352 364-376 235 359 52 ZN137
19 NM390 402-415 257 397 65 ZN127
20 NM418 431-444 297 425 65 ZN139
21 NM430 444-457 298 438 65 ZN117
22 NM435 449-459 346 443 52 ZN112
23 NM444 458-472 310 452 65 ZN147
24 NM461 476-490 328 470 65 ZN119
25 NM490A 504-518 295 498 85 ZN144
26 NM490 504-518 358 498 65 ZN120
27 NM516 531-545 402 525 47 ZN115
28 NM518 532-542 378 526 65 ZN121
29 NM538 552-566 406 546 65 ZN122
30 NM540 554-570 380 548 65 ZN146
31 NM560 574-588 427 568 65 ZN123
32 NM568 583-595 448 576 52 ZN109
33 NM588 603-617 457 596 65 ZN124
34 NM620 637-652 457 630 65 ZN125
35 NM640 657-672 484 650 65 ZN129
36 NM667 684-699 484 677 65 ZN126
37 NM687 704-719 484 697 79 ZN143
38 NM693 710-725 548 703 65 ZN118
39 NM695 712-727 510 705 65 ZN142
40 NM705 722-737 510 715 65 ZN140
41 NM730 747-762 540 740 65 ZN141
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