Rubber Compensators

Rubber compensators are flexible pipe components with an elastomer bellows and a connection such as a flange. They absorb thermal expansion, mechanical and acoustic vibration, and stress in piping systems. High- and shallow-convolution types provide different characteristics for movement absorption and flow resistance.

A rubber compensator provides a flexible connection between pipe sections and limits the transfer of movement and noise. Its elastomer bellows can absorb expansion in several directions and accommodate installation inaccuracies within tolerance. Rubber compensators are used with pipes, valves, pumps and equipment, and may also act as dismantling pieces or seals at wall penetrations.

Rubber compensators are used in steel, waste processing, food, chemical and petrochemical plants, shipping, offshore facilities, plant construction, gas installations, power stations, and water and wastewater systems. Type 50 is also specified for construction, engine building, shipbuilding, and solar and wind energy installations.

First establish the movements the compensator must absorb. Then assess the medium, operating pressure, temperature range and reaction force. Check that enough strong anchor points are present and that fixed flanges cannot damage the bellows. Finally, match the elastomer grade, nominal diameter and flange type to the installation.

Key attributes include elastomer grades, high or shallow convolutions, rotating electrogalvanised steel flanges, DIN PN 10 and, for specific Type 50 versions, TÜV/DIN 4809, drinking-water and marine approvals, FDA and EC 1935/2004 compliance.

Frequently asked questions

Rubber compensators can absorb thermal expansion, mechanical vibration, acoustic vibration and stress in piping systems. A shallow-convolution Type 50 provides substantial movement capacity in all directions. The required direction of movement and reaction force must be established during selection.

Type 49 has a high convolution, low inherent resistance and substantial expansion capacity within a short installation length. Type 50 has a shallow convolution for low flow resistance and movement in all directions. Both types are available in different elastomer grades.

Check the number and strength of anchor points, the sizing of fixed flanges and the movement to be absorbed. Also record the medium, operating pressure, temperature range and reaction force. These parameters guide the choice of bellows and flange type.

Type 50 PTFE has a shallow-convolution rubber bellows with a PTFE lining for chemical resistance and non-stick properties. Maximum operating pressure is 16 bar, or 25 bar for the NBR/CR version with an orange identification ring. From DN 50, a vacuum support ring may be used under specified conditions.