Simple Shedule 80 PVC Joint question

[dlamini]

Can anyone describe to me the options available for joining pieces of Sch 80 pvc together?
Would push-on joints combined with solvent welding be appropriate? Or is that overkill?
Are "push-on" joints the same as "gasketed" joints?
Also, for connecting this Sch 80 to existing fanged steel pipe, can anyone recommend the best apparatus to make that connection?

This is for relatively low pressure applications, ~ 10" pipe, where sludge is being pumped a distance of no more that 400ft.


Any info would be appreciated, thank you.

 

[bimr]

The pipe is probably too big to think about using solvent weldng.

You probably want to look into mechanical joints.

http://www.ebaa.com/Products/2000PV-2200/

 

[dlamini]

Bimr,

The pvc pipe people don't seem to think 12" schedule 80 was too big for solvent welded, push-on joints. Hmmm....

Those particular EBBA products look like they are for connecting pvc pipe to a ductile iron fitting, not say one straight 20ft length of pvc to another straight 20 ft section of pvc.

Were you referring to a harness instead?

Again, thanks for the input.

 

[jdarco]

In that size in schedule 80 you are limited to solvent welded, maybe a victaulic connection for straight runs (make sure they roll groove the pipe, NOT cut groove). Connecting to steel is usually done with standard ANSI flanges, which are available in PVC. Check out

http://www.harvel.com.

They may also offer a gasket joint for pipe runs. They have a good deal of information on joining available

 

[bimr]

dlamini,

Most large PVC piping is made with a bell and spigot unrestrained connections than includes an eleastomeric gasket to seal the joint. Rubber gasketed connectors facilitate construction and produce tight joints, even when made under foul weather and poor field conditions when solvent cementing may be adversely affected. Unrestrained joints are normally used for buried piping applications.

The point that I was making about solvent welding is that it is difficult to physically handle large piping in the field. 2” solvent welding is an easy task, however 10” solvent welding is much more difficult. For example, the following brochure shows a 2-hour initial set time for 10" PVC pipe at a 60-100 Deg F application.

http://www.jmm.com/pdfs/installation/Solvent Weld Install Guide 2006.pdf

Push-on joints and solvent welding are two different methods.

A mechanical joint is a pressure type restrained joint that can easily be disassembled and use nuts and bolts to draw together a pie and gland to compress a gasket around the pipe forming a leak proof seal.

http://www.uniflange.com/

Actually, I am not even sure that your application is a good one for PVC pipe, as you have not presented enough information about the application for one to evaluate it. Pumping a sludge mixture is not an easy or simple task. You might want to consider using an FRP product like Bondstrand 2000 for instance, if your application is outdoors.

http://www.bondstrand-industry.com/_DOWNLOADS/PDF/FP899C.pdf

 

[Sdave999]

Forget the fiberglass pipe! Yuck!!

SCH 80 PVC is a solvent weld connection. A less expensive way to go would be to use SDR 21 with push-on joints. EBBA also makes "strap-on" restraint for this type joint as well.

You can use MJ fittings on SDR pipe if you use the transition gaskets.

 

[IFRs]

How about ductile iron?