include two general categories:
Double O-ring Bell and Spigot joint.
Unrestrained joints, which withstand internal
pressure but not longitudinal forces.
Mechanical Coupling joint.
The bell is obtained by mould during the pipe
production and is part of the pipe itself. The spigot is machined on the other
end and is part of the pipe too. In spray-up process continuous strand roving
is fed through a chopper gun, combined with catalyzed resin, and sprayed onto
the mould surface.
The hydraulic sealing is performed by means of
two elastomeric O-rings, installed in hoop parallel grooves machined on the
By inserting a nipple through the bell and
between the gaskets, one can test the joint immediately after assembly. This
seal check gives high reliability to the installation.
The mechanical coupling joint applies to plain
ends of pipe and the sealing gasket is made of an energized synthetic
Restrained joints, which withstand internal
pressure and longitudinal forces.
O-ring Bell and Spigot with locking key joint
The joint is a double O-ring Bell and
Spigot type with a locking device, that is inserted through a bell
opening into a hoop groove. This joining system accommodates
and Strap joint
This permanent joint consists of a
hardening of impregnated glass, mats and tissues laminated according
to specified width and thickness. The laminated joint provides
continuity in both hoop and axial directions.
GRP flanges are available to meet
drilling according to ANSI, DIN, BS, UNI, etc.