Expansion joints contain either one or multiple flexible elements to compensate for dimensional changes, which may be caused by thermal expansion or contraction of a pipeline, duct or vessel. Bellows type expansion joints, a “specialty” of KLINGER, are characterized by being virtually maintenance-free. KLINGER’s expansion joints represent a highly specialized product offering, which requires the customer to state the diameter, design movements, pressure and temperature, materials of construction, connection type and length in order to receive the expansion joint tailored to his specific needs.
Most metals expand as temperature rises and contract when it decreases. In pipelines this causes variation in the length of individual sections of the pipeline. As pipelines are normally anchored from at least two connection points, any variation in length causes thermal strain in the material and enhanced forces at the connection points. Pipe expansion is as far as possible compensated with the natural flexibility of the pipeline, but should this be insufficient, expansion joints are needed to compensate for the movements.
In addition, expansion joints absorb mechanical vibrations of pumps, compressors, turbines and engines, which could otherwise cause damage to the adjoining pipelines, their supports or any other installed instruments.
Central component in expansion joints is the bellow, which thanks to its shape and thin wall acts like a spring. In order for the bellow to be suitable for use as an expansion element, however, it must meet the following criteria:
Our range of bellows includes two different types: edge welded and formed. Formed bellows are manufactured from a thin-walled cylindrical metal tube, which is formed into corrugations using hydraulic or mechanical pressure. Edge welded bellows, on the other hand, are manufactured from individual metal diaphragms that are welded together.
Regardless of the way of manufacturing, the bellows in our product range are extremely flexible and durable. Bellows are resistant to pressure and temperature, and are vacuum-tight.
Bellows are typically used as:
KLINGER’s product range of metal hoses are indispensable in applications where movement or thermal expansion causes tension and fatigue to a pipeline. Utilizing metal hose solutions counters the formation of pipeline cracks or leakages.
Metal hoses offer a solution to applications, where vibration, movement or thermal expansion cause tension and fatigue to the pipeline. Metal hoses can counteract misalignment and thermal expansion, as well as minimize the movement caused by vibration and machine operation. The use of metal hoses prevents cracks or leakages forming in the pipeline.
We supply metal hoses both according to standard measurements and according to the customer’s own measurements.