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  All plastic-lined steel pipes follow this dimension series.
Same materials and matching dimensions are used for pipe fittings and straight pipes, to be able to interchange for general use.
Straight Pipe
Length shall be sized randomly within 6m as per user requirements.
The DN for polytetrafluoroethylene(PTFE)-lined steel pipe is <300,and its wall thickness should also be reduced accordingly.
Threaded flange is used when DN of plastic-tightly-lined steel pipe is ¡Ü125,and when DN is ¡İ150, common welded flange shall be applied.
| Dimension series for plastic-tightly-lined steelpipes |
Dimension Series for steel pipe with plastic lined inside by hot rolling |
| nominal diameter |
external diameter |
pipe cliff depth |
plastic pipe cliff depth |
tetrafluoroethylene pipe depth |
| DN |
D |
S |
t |
t |
| 25 |
39 |
3.5 |
2.5 |
2.0 |
| 32 |
45 |
3.5 |
2.5 |
2.0 |
| 40 |
54 |
3.5 |
2.5 |
2.0 |
| 50 |
67 |
3.5 |
3.0 |
2.0 |
| 65 |
82 |
4.0 |
3.5 |
2.5 |
| 80 |
97 |
4.0 |
3.5 |
2.5 |
| 100 |
116 |
4.0 |
3.5 |
3.0 |
| 125 |
136 |
4.5 |
4.0 |
3.0 |
| 150 |
159 |
4.5 |
4.0 |
3.5 |
| 200 |
219 |
7.0 |
6.0 |
4.0 |
| 250 |
273 |
7.5 |
6.0 |
4.5 |
| 300 |
325 |
8.0 |
7.0 |
4.5 |
| 350 |
377 |
9.0 |
8.0 |
5.0 |
| 400 |
426 |
9.0 |
8.0 |
5.0 |
| 450 |
480 |
10.0 |
9.0 |
5.5 |
| 500 |
530 |
10.0 |
10.0 |
5.5 |
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| nominal diameter |
external diameter |
pipe cliff depth |
lining depth |
| DN |
D |
S |
t |
| 25 |
32 |
3 |
2.0 |
| 32 |
38 |
3 |
2.0 |
| 40 |
45 |
3 |
2.0 |
| 50 |
57 |
3 |
2.5 |
| 65 |
76 |
4 |
2.5 |
| 80 |
89 |
4 |
3.0 |
| 100 |
108 |
4 |
3.0 |
| 125 |
133 |
4 |
3.0 |
| 150 |
159 |
4.5 |
3.5 |
| 200 |
219 |
6 |
3.5 |
| 250 |
273 |
7 |
4.0 |
| 300 |
325 |
8 |
4.0 |
| 350 |
377 |
9 |
4.0 |
| 400 |
426 |
10 |
4.5 |
| 450 |
480 |
10 |
4.5 |
| 500 |
530 |
10 |
5.0 |
| 600 |
630 |
10 |
5 |
| 700 |
720 |
10 |
5 |
| 800 |
820 |
10 |
6 |
| 900 |
920 |
10 |
6 |
| 1000 |
1020 |
10 |
8 |
| 1200 |
1220 |
10 |
8 |
| 1400 |
1420 |
10 |
8 |
| 1600 |
1620 |
10 |
8 |
| 1800 |
1820 |
10 |
8 |
| 2000 |
2020 |
10 |
8 |
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