Raw sewage pipeline materiL 1

[JohnWeal]

Good afternoon,

Generally we use for most raw sewage buried pipelines ductile iron cement lined.

A recent proposal has suggested glass reinforced epoxy.

Has anyone had any experience they can share?

Is it suitable for H2S, gritty wastewater, sludges and also perhaps vacuum conditions, thrust blocking.

Best Regards
John

 

[LittleInch]

Is it suitable for

H2S, - I think so - it's pretty inert and resistant to most normal chemicals

gritty wastewater, - less so - GRE doesn't like abrasion / abrasive materials so probably no

sludges - see above. smooth sludge ok, gritty sludge, no

and also perhaps vacuum conditions, - should be Ok

thrust blocking - not sure what you mean, but GRE is normally glued and hence has axial strength and doesn't need trhust blocks. Not it has a very high poissons ratio so tends to contract under pressure, but sewage pressures I guess are fairly low.

PE or UHMWPE would seem a better solution of you're not going for steel / concrete.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[bimr]

Glass reinforced epoxy is not commonly used here. Nothing wrong with it, it is just more expensive.

PVC is probably more commonly used than ductile iron.

Thrust blocks are definitely old school and not commonly used anymore for a number of reasons. Thrust blocks are never used on gravity systems. Thrust blocks have fallen out of favor because thrust block design is based on unknown characteristics of soils.

Thrust blocks were generally used on unrestrained connections (bell and spigot) for underground work. Most piping is now restrained in some manner using restraints such as megalugs.

Piping that is glued together is considered to be restrained and does not require thrust blocks.

https://daviddkent.wordpress.com/2013/01/22/thrust-restraint/

 

[nackra]

DI pipe linings & coating will depend on your application (gravity or pressure), sewer characteristics and soil conditions. DIPRA has several publications that you should review:

https://www.dipra.org/ductile-iron-pipe-resources/technical-publications/applications

PVC is widely used for various pipe sizes (6-inch through 21-inch). Gravity or pressure application will affect PVC pipe selection.