At start of pipelines of big length special starting compensators which are developed to make the first start of hot water supply or heating are used. Konstruktsionno such compensator differs from the ordinary axial compensator a little. It consists of the bellow valve (a corrugated cover) made of the stainless steel imposed in several layers and a special casing which is tight. The starting bellows-sealed compensator assumes not only axial movements, but also different vibrations which accompany operation of any pipeline.
Feature of use of the starting compensator is that it is used only at start of system, and assumes the main loading which arises at high-speed filling of the pipeline with water or other working environment. To guarantee high-quality operation of such compensator, at its production heat resisting versions carbonaceous staly and hot-rolled branch pipes which are executed according to GOST are applied.