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Metal hose for welding

Metal hose for welding

general characteristics

They have a hermetic shell — an annular corrugation made of stainless steel, enclosed in a protective braid, from one, two or three layers. The end fittings for welding are designed to connect piping systems. The purpose is to reduce the installation, vibration, thermal and other types of stress that are unavoidable when transporting liquid and gaseous products under high pressure, with different temperature and speed parameters.

Manufacturing

The weld metal hose is made of high quality stainless steel 12 x 18n10t and its foreign counterparts with a steel tape thickness from 0.15 mm to 0.5 mm. For a braid, steel with a mark of 12 x 18n9t is used. A flexible constituent is made from a stainless pipe billet with mechanical or hydraulic forming of the corrugations. The product with the CNGS brand is made by convoluting a steel strip, which has been previously subjected to profiling, along a spiral. Contact-seam welding is performed at the top of the corrugation.

Percent alloy composition

Steel C Cr Fe Ni Ti Mn P S Si Impurities
12Х18Н9Т ≤0.12 17−18 Basic. 8−9.5 ≤0.8 ≤2 ≤0,03 ≤0,02 ≤0.8 ≤0.2

Percent alloy composition

Steel C Cr Fe Ni Ti Mn P S Si Impurities
12H18N10T ≤0.12 17−18 Basic. 9−10 ≤0.8 ≤2 ≤0,03 ≤0,02 ≤0.8 ≤0.15

The standard diameter of the hoses is from 20 mm to 350 mm with the length of the flexible part from 250 mm to 6000 mm. Product marking (for example, 4655A-2−80−30−4,0) is performed according to the following accepted standard:

· 4655A — a series of metal hose,

· 2 — compliance with operating conditions (ground conditions),

· 80 — The nominal diameter,

· 30 — 30 kgf / sq. cm — pressure Prab,

· 4,0 — length L-4 meters.

Scope of use

Are divided into products for land, air, sea. Provide transportation of various gaseous products and liquids at a temperature from -270 to + 65 ° 0С, at a pressure range from vacuum to 300 Bar. They are widely used in the oil and gas industry, machine-tool, automotive, aircraft, shipbuilding, construction and construction.

Advantages

Such flexible joints are fire-resistant, characterized by reliability, durability. The main structural element of the structure is a metal sheath that accepts radial and axial force loads, preventing the sleeve from bending. This allows you to compensate for temperature, geometric movements, reduces noise, dampens vibration between stationary and vibrating parts of machines and pipelines.

Selection

The planned operating conditions should be taken into account. The use is limited in pipeline sections with a speed of 8.0 m / s for liquids and 50.0 m / s for gases. The optimal length for each individual case is determined, twisting, squeezing or stretching of the product is not allowed. It is necessary to provide for the presence of neutral sections in the zones of end fittings that are not exposed to bends during the operation of the equipment.

Installation is carried out taking into account the presence of insignificant length of loose areas. To prevent excessive sagging, yokes, trays, supports with pads made of leather, rubber or fluoroplastic are used as supports. The distance between the supports should not be more than two meters, the movement and friction of the sleeve relative to the supports are not allowed.

Buy at a bargain price

LLC «Avek Global» offers the most favorable conditions for the sale of rolled metal. The offered assortment of metal hoses can satisfy any customer. The price depends on the volume of purchase and the additional terms of delivery. By carrying out bulk orders, you can count on the company’s flexible discount system. Our managers are always ready to provide advice. A large assortment will not leave you without a choice. The lead time for orders is minimal. All products are certified. Quality is guaranteed by strict observance of all technological norms of production.