It is essential that all relevant parameters are taken into account when selecting the type of expansion joint for a particular application.
Prokom offers hand-made fabric expansion joints in all sizes and shapes for any application from single-ply bellows for ventilating systems to highly sophisticated multi-layer expansion joints for gas turbine exhaust.
The materials used for the individual layers of multi-layer expansion joints and the numbers of layers vary according to the type of expansion joint and the operational conditions. In general, the composition is an inner layer of surface treated special fabrics or alloyed stainless steel weavings for mechanical protection, followed by one or more layers of insulation materials for gas temperatures above 300 °C. If the gas is aggressive, a gastight membrane, typically a PTFE-laminated glass fabric serving as a chemical barrier, is incorporated before the outer layer. The outer layer functions as a protection against ambient and mechanical influences, and also acts as a pressure reinforcement. A flange reinforcement of fabric provides mechanical and thermal protection of the expansion joint in the flange area.
