pipe material for treated sewage water 1

[rajeevk]

Please guide to select material of pipe line carrying treated sewage water' The pipe line is 15 Km. long with no drain point in between . Further it is expected that the water quality (not TSS ) may vary with season . Is ductile iron pipe suitable ?

 

[EdStainless]

Concrete or cement lined pipe would be the most common for this application. I presume that this is large diameter.

If it is smaller diameter then lined DI may be a good option. I have seen continious plastic lining installed into layed pipe. I have also seen DI that was internally coated in a shop. I am not comfortable with using bare DI in this application.

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Corrosion never sleeps, but it can be managed.

http://www.trenttube.com/Trent/tech_form.htm

 

[JStephen]

FYI- DI pipe and fittings are nearly always cement-mortar lined (at least the ones for potable water are.)

It might help to know where you are at (or where the pipeline is, rather). Material availability may factor into it. It would also help to know the pipe size involved.

Some types of soil can cause problems with DI pipe- seems like it's sulfates that cause the problem, but don't remember for sure.

PVC pipe is fairly common around here in sizes up to 12"-16" or so, and is cheaper than DI. Different types of concrete cylinder pipe are fairly common in sizes from 12" on up.

 

[ApC2Kp]

rajeevk,
The PVC pipe suggested by JStephen is probably the lowest installed cost in the small to medium diameters < 16". If the line size is larger, or a tougher material is required, then HDPE pipe fusion joined (driscopipe) would be the next choice (no thrust blocks required). For even larger sizes a resin + mortar pipe is made by HOBAS, very similiar to concrete pipe. There is also some HDPE pipe designed with bell and spigot push-on joints like the PVC or ductile iron pipe. Fiberglass pipe is also used for underground piping, but is usually more costly depending on thickness. If the pipe is above ground, then it is a different choice of pipe material due to supports, and sun ultra-violet degradation of plastics. Ductile iron, plastic, and concrete pipe all avoid the coat and wrap corrosion protection required for buried carbon steel. If the pipe is above ground and large diameter, then cement lined steel might be best. HDPE pipe laid on the ground is used by open pit mining. If the treated sewer water pipe can be laid on the ground, then the HDPE would be considered.
I think the continuous plastic liner mentioned by EdStainless is the Insituform fiberglass with a partially cured resin liner that is flat when pulled into the sewer, inflated and then cured with hot air. The HDPE fusion joined pipe is also made in diameters where it can also be pulled into existing sewer pipe to repair and re-line old sewer pipes.