Stainless Steel
Metal Hoses

Design Parameters for Corrugated Metal Hoses

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All corrugated metal hose and hose assemblies are manufactured according to ISO13080

ECF 01.0, 01.1, ECF 01.2

An extra flexible metal hose (so called closed pitch) has extra flexibility and increased service life.

An extra flexible metal hose (so called closed pitch) has extra flexibility and increased fatique life.

It’s used with braiding to manufacture metal hoses for industrial use.

ECF 02.0, ECF 02.1, ECF 02.2

A standard flexible metal hose (so called standard pitch) has standard flexibility.

A standard flexible metal hose (so called standard pitch) has standard flexibility.

It is used to manufacture heat exchangers, metal hoses for industrial use. It is well-suited for multiple bending.

ECF 03.0, ECF 03.1

A minimum flexible metal hose (so called open pitch) has minimal flexibility.

A minimum flexible metal hose (so called open pitch) has minimal flexibility.

It is used to manufacture heat exchangers. It is well-suited for one-way bending, not designed for cyclic loads.

Operating conditions

The metal hose is serviceable in such operating environments and ambient media as:


  • Air, vacuum;
  • Water under GOST 6709-72 and GOST 2874-73 containing chloride not more than 12 mg/l;
  • Ethyl alcohol under GOST 3099-95, GOST 131-67, GOST 5962 -67, GOST 5963-67;
  • AMG-10 under GOST 6794-75;
  • It is used for media where metal hose application is agreed with the manufacturer.

Materials

Corrugated metal hose: AISI304, AISI304L, AISI316L, AISI321.
The steel grade AISI304 (08Х18Н10) is used at braid manufacture.
Fittings carbon steel with nickel coating, brass, copper, AISI201 / AISI303 / AISI304 / AISI316.

Other steel grades are allowed to be applied to manufacture hoses and end fittings according to the current reference documents that provide the requirements of the present specifications.

Operating pressure

Metal hoses range as serviceable from vacuum to 350 bar

Temperature conditions

from minus 270 ºС to plus 800  ºС

Humidity

up to 100%

Flow rate

Metal hoses are used at flow rates:
up to 6 m/s – for liquids,
up to 35 m/s – for gaseous environments (a metal hose without any braid),
up to 50 m/s – for gaseous environments (a metal hose with a braid).

It is required to use additional design solutions in order to apply metal hoses at higher flow rates.

Internal conducting shell

It is used to prevent internal wear of metal hoses when going through gaseous environments at a speed more than 50 m/s and/or when an operating environment has abrasive inclusions.

Additional protection fatique life

Metal hose service life depends on the number of loading cycles (one loading cycle includes a one-way movement of the metal hose and its return to the initial point) and many other factors.