Double Bell Coupler Joint

Frequently asked questions

Is a double bell coupling the same as a double bell coupler?

Yes. Double bell coupling, double bell coupler and double bell coupler joint are names for the same arrangement: a separate sleeve with a bell at each end that joins two compatible fiberglass pipe ends. It is not the threaded fiberglass coupling used on thread joints, which carries the pipe threads and transfers axial load. Name the double bell coupler in your enquiry so the offer follows this joint.

How is a double bell coupler different from a bell and spigot joint?

In a bell and spigot joint, the spigot of one pipe length enters a bell formed on the end of the next length. With a double bell coupler, two spigot ends enter a separate coupler, so the coupler is its own item on your bill of materials, with its own count, gasket set and spares. The catalogue reference here reaches 4,000 mm, against 1,400 mm for the rubber-seal spigot path.

Does a double bell coupler joint need thrust blocks?

Yes. The joint is listed as non-restrained, with high flexibility and deflection, so thrust forces at bends, tees and dead ends must be carried by thrust blocks or a hybrid system. If your layout cannot accommodate thrust blocks, compare a restrained joint before you fix the joint type, and describe your thrust-management arrangement in the enquiry so it can be confirmed with the seals and movement limits.

What sizes and pressures are listed for the double bell coupler joint?

The catalogue reference on this page is up to 4,000 mm diameter and pressure up to 40 bar. These are separate limits, not a combined rating for every size, so the rating for your diameter and duty is confirmed on the datasheet. A technical datasheet is not published on this page; use Request the product datasheet with your diameter, design pressure and layout to receive the applicable dimensions and ratings.

Where is a double bell coupler joint typically installed?

The joint is typically used in buried applications, and hydropower applications may use aboveground installation instead. If your line has both buried and aboveground sections, mark where each one starts and ends on your layout drawing and say which sections are hydropower service. The seals, movement limits and thrust-management arrangement can then be reviewed for each section of your line rather than assumed.

Can the double bell coupler joint be supplied in a testable configuration?

Yes. The joint is available with a testable joint configuration. State in your enquiry whether your project needs it, and mark it as not sure yet if your specification has not decided. The configuration offered is then confirmed against its drawing, together with the documents that go with it, so the joint you receive matches the one your installation and test plan assumes.