Joining Large Diameter Pipe and Fittings

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Engineering Info

6″ Diameter and Larger
As pipe diameter increases, so does the difficulty in installing it. The professional installer should be able to successfully assemble large diameter pipe and fittings by following the Weld-On Solvent Welding with Primer instructions listed in the beginning of this guide along with the following additional recommendations.

1. Use of proper size applicators is even more necessary to ensure enough cement is applied to fill the larger gap that exists between the pipe and fittings.

2. Of equal importance is the use of the applicable cement for the size of pipe and fittings being installed. We recommend the following:
up to 12″ PVC Sch 40 or Sch 80 – Weld-On 711 TM & 717 TM
up to 30″ PVC Sch 40 or Sch 80 – Weld-On 719™ up to 12″ CPVC – Weld-On 714™ & 724™
up to 24″ CPVC Duct – Weld-On 729™

3. End of pipe must be cut square and chamfered (beveled). (See photo beside)

4. Increase size of joining crew: 6″- 8″: 2-3 people per joint 10″- 30″: 3-4 people per joint
It is important in large diamete –􀀈 . ., joining that the primer and cement
be applied simultaneously to the
pipe and fittings.

5. Make sure to apply a second, full layer of cement to the pipe.

6. Because of the short sockets in many large diameter fittings, IT IS VERY IMPORTANT TO HAVE PIPE BOTTOMED INTO THE FITTING. Large diameter pipe is heavy and can develop significant resistance during insertion, before reaching socket bottom. It is for this reason that we recommend above 4″ diameter the use of a pipe-puller such as the one pictured. (Available at FABCO PLASTICS).

7. Large diameter pipe and fittings require longer set and cure times. *(In cold weather, a heat blanket may be used to speed up the set and cure times.)

8. Prefabricate as many joints as possible.

9. If pipe is to be buried, make as many joints as possible above ground, then after joints have cured, carefully lower into trench.

10. Never bury empty cans, brushes, or anything else containing wet cement, primer, or cleaner next to the pipe.
*Contact FABCO PLASTICS for further information. cure times on page 22.

3. Flush system before putting into operation.

4. Installers should use extra care during assembly to ensure proper installation of system.

5. Make sure the proper cement for the specific application is used.

6. If there is any doubt about compatibility of materials (pipe, fittings or cement) with chemicals in system, manufacturers of materials should be contacted.

Documents

Technical Document