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Dimensions and Arrangements of Slots
Example of a pipe section with a six-slot configuration
Table I: Sizes DN 40 to DN 100 (1.5" - 4")
| Slot width, w |
0.2 +0.060 |
0.3 +0.60 |
0.5 +0.10 |
0.75 +0.20 |
1.5 +0.20 |
2.0 +0.20 |
| Nominal Size DN |
n
min. |
+- 5% |
f, as a percentage |
| 40 |
3 |
85 |
3.5 |
5 |
6 |
8.5 |
9.5 |
12 |
| 50 |
3 |
108 |
3.5 |
5 |
6 |
8.5 |
9.5 |
12 |
| 80 |
3 |
168 |
3.5 |
5 |
6 |
8.5 |
9.5 |
12 |
| 100 |
5 |
216 |
3.5 |
5 |
6 |
8.5 |
9.5 |
12 |
| Rib width*), b (+- 0.5) |
4 |
4 |
5.5 |
5.5 |
9.5 |
9.5 |
Table II: Sizes DN 125 to DN 200 (5" - 8")
| Slot width, w |
0.3 +0.60 |
0.5 +0.10 |
0.75 +0.20 |
1.5 +0.20 |
2.0 +0.20 |
3.0 +0.30 |
| Nominal Size DN |
n
min. |
+- 5% |
f, as a percentage |
| 125 |
5 |
240 |
4.5 |
5.5 |
7.5 |
8.5 |
11 |
|
| 150 |
5 |
285 |
|
5.5 |
7.5 |
8.5 |
11 |
13.5 |
| 200 |
6 |
390 |
|
|
7.5 |
8.5 |
11 |
13.5 |
| Rib width*), b (+- 0.5) |
4 |
5.5 |
5.5 |
9.5 |
9.5 |
11 |
Table III: Sizes DN 250 to DN 400 (10" - 16")
| Slot width, w |
0.75 +0.20 |
1.5 +0.20 |
2.0 +0.20 |
2.0 +0.30 |
| Nominal Size DN |
n
min. |
+- 5% |
f, as a percentage |
| 250 |
6 |
450 |
7 |
8 |
10 |
12.5 |
| 300 |
6 |
530 |
7 |
8 |
10 |
12.5 |
| 350 |
8 |
640 |
|
8 |
10 |
12.5 |
| 400 |
8 |
120 |
|
8 |
10 |
12.5 |
| Rib width*), b (+- 0.5) |
5.5 |
9.5 |
9.5 |
11 |
*) For every metre of filter pipe, ten ribs up to 2mm wider shall be permissible.
- Key to Symbols:
- f, total effective slot area (with a and w in the middle of the tolerance zone)
- a, total of all slot lengths in one plane
- n, minimum number of slots in one plane
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- More Informations:
-
- Technical Data
- Screen & Casing Assembly
- Specifications Sizes
- Screw Threads
- Usage and Installation
- HDPE Casing & Screens
- Well Casing & Screen Main page
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