ISO or International Standards Organization was created to establish worldwide standards for industry. They are responsible for formulation of standards regarding quality assurance or speci c products. The ISO 10380 standard was developed to help de ne the industry requirements for design, manufacture and testing of corrugated metal hose and hose assemblies. The following is a summary of the various sections covered in this standard.
ISO 10380 speci cation lists the more popular materials used in the manufacture of corrugated metal hose, braid, ferrules and end ttings. Two of most common materials utilized for corrugated metal hose are austenitic stainless steel and copper based alloys. The speci cation is very clear that the material used in manufacturing the corrugated metal hose shall be selected on the basis of their suitability for forming or welding and for the application conditions under which they will operate. Materials other than those listed above may be selected by agreement between the manufacturer and the user.
Details and requirements speci ed in this section include hose diameter, bend radii and overall length tolerances. It is common for manufacturers to list their nominal hose diameter in published literature. ISO 10380 lists the requirement that the actual hose inside diameter will be at least 98% of the nominal hose size. The bend radius covered in the speci cation includes nominal static and nominal dynamic bend radius. Dynamic bend radius is used in cycle life fatigue testing. Overall length tolerances listed in the ISO 10380 are -1% to +3%.
The speci cation lists the maximum permissible pressure ratings to be used in testing performed in accordance with ISO10380.
Pressure reduction for elevated temperature conditions is critical in applying the proper metal hose for an application. This specification provides for a method of determining the maximum service pressure for a metal hose assembly under these conditions.
The materials listed in the specification, with the exception of carbon steel, do not need to be derated in low temperature applications down to -392°F or -200°C. Carbon steel material used for end ttings may be used to a minimum temperature of -68°F or -20°C.
Corrugated metal hose bend radius and minimum acceptable cycle life design requirements are outlined. Values and test criteria for meeting static and dynamic bend radii are also listed.
Manufacturing and corrugation designs are addressed by the ISO 10380 speci cation. Seamless or longitudinally welded tube may be corrugated into annular or helical corrugation designs. Details of methods for joining or segmenting metal hose are also listed.
ISO 10380 specifications are broad for the design of the braid.
Methods of Assembly
Many different methods of fitting attachment and unacceptable weld characteristics are outlined by the ISO10380 speci cation. The use of protective covers is also addressed.
Bend, fatigue and burst test requirements are defined by ISO 10380. OmegaFlex performs each of these tests when designing or qualifying our products. The fatigue test is widely recognized in the metal hose industry as a standard for cycle life testing. While ISO 10380 lists the average number of cycles of 50,000 at their specified pressure ratings, OmegaFlex performs testing at our published maximum working pressure.
Several types of non-destructive testing is addressed by the speci cation. These include pressure proof
test by hydraulic pressure or pneumatic pressure and leakage test by pneumatic or vacuum testing. Cleaning and marking of metal hose assemblies is outlined.