Pipe diameter increase

  • #1
Was wondering whether a 2 kilometre section of 80mm asbestos water main was replaced with 150mm PVC then rejoined into the last 3 kilometres of old asbestos would it create pressure breaks. The head pressure is 50 metres. Cheers.
 

Answers and Replies

  • #2
569
85
If you're asking whether the reduced pressure drop in the new PVC pipe will increase the pressure in the old pipe enough to rupture it, it's hard to say. Did the replaced old pipe rupture? Was the remaining old pipe commonly subjected to the 50m head when flow was low?
 
  • #3
If you're asking whether the reduced pressure drop in the new PVC pipe will increase the pressure in the old pipe enough to rupture it, it's hard to say. Did the replaced old pipe rupture? Was the remaining old pipe commonly subjected to the 50m head when flow was low?
The old pipe has ruptured many times over the last year with the head pressure being constant with the low flow rate due to its age and deterioration, although the new larger diameter pipe has not been connected yet, it was just my thought that the old pipe would not handle the pressure once it was ?.
 
  • #4
569
85
The old pipe has ruptured many times over the last year with the head pressure being constant with the low flow rate due to its age and deterioration, although the new larger diameter pipe has not been connected yet, it was just my thought that the old pipe would not handle the pressure once it was ?.
But has the remaining old pipe ever ruptured? Maybe it's lying in more stable soil. Anyway, I'd hope the replacement of the remaining old pipe is "in the works" awaiting funding.
 

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