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| MP
68 |
MP 68 is used when the sophistication of
a fully bolted pipe is not required and is used extensively
in Botswana.
The MP 68 pipes are assembled by clipping two half
sections together to form the required shape. The sections
are fixed using either stitches for sizes less than
825 mm or hook and eye bolts for sizes greater than
825 mm. The joints are staggered as indicated in figure
3 by using split sections.
The plates are corrugated as indicated in figure 1
and have the properties as indicated in table 1. The
pipes are
manufactured from either 1,6; 2,0; 2,8; 3,5 mm thick
steel. |
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| Table
1 Sectional Properties |
| Thickness t (mm) |
Area
of section (mm2 /
mm)
|
Moment
of inertia
(mm4 /
mm) |
Section modulus
(mm3 /
mm) |
radius of gyration
(mm) |
| 1,6 |
1,73 |
32,72 |
4,58 |
4,35 |
| 2,0 |
2,16 |
41,38 |
5,63 |
4,38 |
| 2,8 |
3,02 |
59,40 |
7,66 |
4,43 |
| 3,5 |
3,78 |
76,29 |
9,42 |
4,49 |
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| Table
2 Pipe Arch |
| Profile
No |
Spam
(mm)
|
Rise
(mm) |
End
area (mm2) |
| NPA 1 |
450 |
330 |
0.15 |
| NPA 2 |
600 |
400 |
0.22 |
| NPA 3 |
750 |
500 |
0.35 |
| NPA 4 |
900 |
500 |
0.48 |
| NPA 5 |
1 050 |
650 |
0.86 |
| NPA 6 |
1 200 |
750 |
0.86 |
| NPA 7 |
1 350 |
840 |
1.06 |
| NPA 8 |
1 500 |
930 |
1.31 |
| NPA 9 |
1 600 |
1 020 |
1.60 |
| NPA 10 |
1 800 |
1 120 |
1.88 |
| Table
3 Round Pipe |
| Profile
No |
Diameter
(mm)
|
End area (m2) |
| NPA 1 |
300 |
0.07 |
| NPA 2 |
375 |
0.11 |
| NPA 3 |
450 |
0.16 |
| NPA 4 |
525 |
0.22 |
| NPA 5 |
600 |
0.28 |
| NPA 6 |
675 |
0.36 |
| NPA 7 |
750 |
0.44 |
| NPA 8 |
825 |
0.53 |
| NPA 9 |
900 |
0.64 |
| NPA 10 |
1 050 |
0.87 |
| NPA 11 |
1 200 |
1.13 |
| NPA 12 |
1 350 |
1.43 |
| NPA 13 |
1 500 |
1.77 |
| NPA 14 |
1 650 |
2.14 |
| NPA 15 |
1 800 |
2.55 |
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A = 9 Corrugation section
B = 4 Corrugation section
C = 5 Corrugation section
D = Length in multiples of 610 mm |
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