What type of pipe to use?
What type of pipe to use?
(OP)
I have an old gravity sewer line that runs 215ft to a sewer manhole.
The existing line is a 4" clay tile and the city engineer would like me to replace it/ upgrade the line. The line currently services an industrial facility with about 100 people. The pump that empties the lift station into the sewer line is a 1.5hp submersible pump, that pumps about 100 gpm. A camera view of the existing line shows that other than some sludge it is in pretty good shape. To appieze the town engineer we are looking at shoving a pipe inside the line to act as a new line without digging up the street. My sewer contractor would like to use sch 40 pvc in 20ft sticks. The town engineer would like us to use 2.5" sch 40 pvc. I am not crazy about the pvc choice. I would rather go with 2" continuous polyethylene if we could make that work.
What pipe size and material would you suggest?
Thanks for your thoughts.
StoneCold





RE: What type of pipe to use?
Many Contractors do not want to line pipe less than 6 inches because of the tight clearances. There are other lining methods but many of them do not line pipes less than a 4 inch liner.
The most common type of liner used for lateral rehabilitation is CIPP.
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Typically there are local Contractors that specialize in lateral lining. Recommend that you use a Contractor that does this type of work every day.
RE: What type of pipe to use?
RE: What type of pipe to use?
Richard A. Cornelius, P.E.
WWW.amlinereast.com
RE: What type of pipe to use?
We will see what I can work out with the town engineer to put this to bed.
Regards
StoneCold
RE: What type of pipe to use?
RE: What type of pipe to use?
Brake HP = (gpm * head)/(3960 * pump efficiency)
= (100 * 36.4)/(3906 * 62.5%)
= 1.47 HP
RE: What type of pipe to use?
You are right. I am just used to higher head applications.
RE: What type of pipe to use?
Luckily it was hovering around -10F last week so the ground should be good and frozen to add a little challenge to the project.
Thanks for the input.
StoneCold
RE: What type of pipe to use?
We installed a 4" 200 psi rated Polypropylene line using a bursting head and hydraulically pulling it from the manhole in the street. The pump is puttting out about 65 gpm. Turns out the actuall installation had about 5 more 90's than the drawing to make everything line up. However the flowrate is good enough. It is not pumping dry and re-starting all the time, and it does not fill the lift station up above the inlet, so all is good.
Regards
Stonecold.