PIPE LAYING WORKS

General sequence of Water Main Pipe laying works.

1. Site survey and setting out.
2. Site clearing.
3. Earthwork and trenching
4. Pipe laying and Jointing works
5. Piling to Man hole/ service hall/valve chamber
6. Piling to anchor Block/thrust block
7. Construction of man hole /chamber/bridge/Thrust block
8. Testing
9. Rectification of pipe ( if any)
10. Testing and commissioning
11. Back filling to Pipe trench
12. Site tidying prior to handing over for completion
13. Handing over for completion.

*Item,5,6 and 7 can be done concurrently with item 4.

*Item no.8 can be perform segment by segment

( lat say every 100m of installed and jointed pipe.)

 

Type of testing to be performed.

1. Pressure test.
2. Leakage test
3. Welding test ( in the case of mild steel pipe is in use)

Pipe flushing