A separate line of buisness of NPO GKMP is the production of high pressure metal hoses designed for flexible connection of piping systems, to reduce installation, thermal, vibration and other types of stresses arising in rigid pipelines. These bellows provide transportation of gaseous products and liquids of various chemical composition at temperatures from -270 to + 600 ° C, at pressures from vacuum to 44.0 MPa.
A complete manufacturing cycle has been organized starting from forming a tube from a strip, manufacturing a bellows, and implementing a protective one-, two-, or three-layer braid. This advantage, and, at the same time, having experienced production staff, allows us to guarantee the high quality and operational characteristics of the manufactured metal bellows and hoses, reduce the time and cost of manufacturing, and also sell products for special customer requirements.
ROT nut is a standardized end fitting, regulated by GOST 19334-73 and, along with the convenience of mounting and dismounting (being in fact a quick coupling), tightness of the connection of the metal hose to the pipeline. In most cases, ROT nut is connected directly to the metal hose through the weld-on fitting (ROT nut execution 1 according to GOST 19334-73).
The most widely used are stainless steel hoses with a ROT Du40 nut of execution 1 (less commonly Du65 and Du100) from 3 m to 6 m long. Metal hose material is stainless steel, ROT nut material is stainless steel (less often brass).
Stainless steel metal sleeves with a ROT nut are used in loading and unloading operations of various liquid cryogenic products, mainly liquefied gases - oxygen, nitrogen, etc.
We offer commercially available metal hoses at the ends of the ROT Du40, 65, 100 nut length according to the customer's request, as well as with other cryogenic end fittings: EIGA nut kits for connection to cryogenic piping return fittings; AIGA compounds (NI-15, NI-25) for connection to liquid nitrogen pipelines and the like.
The AIGA coupling is designed for the tight connection of DN 40 mm metal hoses (NI-15 connection) and 65 mm DN (NI-25 connection) to equipment that generates, stores and uses liquid nitrogen. The connection meets the standard of the Asia Industrial Gases Association (AIGA) and includes a nipple (usually welded) that connects to the metal sleeve and a special union brass nut. The mate is a threaded fitting that is mounted on the equipment of the unit for the issuance of liquid nitrogen installed in the storage. Sealing occurs due to the compression of the copper ring between the nipple and the fitting.
The EIGA coupling is used as end fittings for cryogenic metal hoses DN 40 - DN 50 mm, the nipple has a transition from a diameter of DN 60 to diameters of 40, 50 mm. The connection complies with the European Industrial Gases Association (EIGA) standard and includes a nipple with which, by welding or using NPT 1.5 and 2.0 inch conical pipe threads, connects to a metal hose, union brass nut and ball lock. The counterpart is a fitting mounted on a cryogenic installation. The joint is sealed by squeezing the fluoroplastic ring while screwing the union nut.
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