METALLIC EXPANSION JOINTS

Pressure ranges up to 25 kg/cm2 & above two bellows elements are joined together by a center tube and fitted with either pipe ends or flanges. The assembly is capable of both axial and lateral movements but is limited to low pressure applications because of center tube instability.

A double expansion joint consists of two bellows joined by a common connector which is anchored to some rigid part on the installation by means of an anchor base. The anchor base may be attached to the common connector either at installation or at time of manufacture. Each bellows acts as a single expansion joint and absorbs the movement of the pipe section in which it is installed, independently of the other bellows. Double expansion joints should not be confused with universal expansion joints.

Single Expansion Bellow * Most economical expansion joints. * Total installed system cost may be higher than Gimbal, Hinge or Tied Expansion Joint Systems.

This expansion joint is a powerful solution to a difficult design problem, when axial deflections exist, and anchoring is impractical for structural or economic reasons, such as high in the air or short straight pipe runs between two large vessels. The principle of this type of unit is essentially the same as the pressure balanced elbow type, in that the axial pressure thrust is reacted by the pressure acting on a cross-sectional area equal to the area of the working or primary bellows. Since this unit is entirely axial, and there are no directional changes in the pipe, the cross-secti

ONE END FLANGE EXPANSION JOINTS

pressure ranges up to 06 kg/cm2 (special units for higher pressures) These are the simplest form manufactured from single and multi-ply elements and fitted with either flanges or pipe ends these units are suitable for axial movements only though in certain cases will take care of small lateral offset also.

* THE BELLOWS IS A FLEXIBLE SEAL AND IS DESIGNED TO FLEX WHEN THERMAL MOVEMENTS OCCUR IN THE PIPING SYSTEM. IT IS THE BASIC ELEMENT OF EXPANSION JOINTS. * EXPANSIONS JOINTS MAY BE SUBJECTED TO AXIAL MOVEMENT, LATERAL MOVEMENT, ANGULAR MOVEMENT OR ANY COMBINATION OF THESE MOVEMENTS THERMAL OR FUNCTIONAL (MECHANICAL).

The most reliable form of flexible joint is Gimbal Joint capable of absorbing angular motion in all planes. The incorporation includes of absorbing angular motion in all planes. The incorporation includes a pair of hinges connected to a floating Gimbal ring which has a very special advantages like absorbing pressure thrust, supporting the dead weight of the system, transmission of wind & shear loa

Pressure ranges up 40 kg/cm2. Generally installed in multiples of two or three, there joints are designed for angular movements in one plane only. A hinged mechanism contains the pressure loads and ties back to an integral flanger or box restrained lug. Limit stop controls the degree of angular movement. These units can be fitted with either pipe ends or flanges, can be supplied with two hinged sy

The metal bellows is a flexible seal and is designed to flex when thermal movements occur in the piping system. It is the the basic elements of expansion joints.

Sizes types & pressure ranges to suit specific applications Pressure Balanced Bellows are used in piping system where pressure loads are critical, and where complex axial and lateral movements are involved with limited space. Using a pressurized bellows outside the system to counteract forces generated by bellows inside the system, large axial and lateral movements can be absorbed.