- High-pressure hoses are constructed in a way to withstand max. internal pressures. For the design of the hose the longitudinal tensile load is not taken into consideration and, therefore, it must be kept as low as possible by appropriate measures while the hose is being used.
- Tensile loads of more than 250 N must be ruled out by appropriate constructive means.
- It is not permitted to use high pressure hose as a load-bearing component for taking up tensile loads, lateral powers or torsion forces.
How many cycles does hose type XY reach in our internal impulse test bench?
- All SPIR STAR® hose types have to pass a strict qualification test procedure including an impulse test before being released for sale.
According to which standard are the SPIR STAR® hoses produced?
- Spiralized high-pressure hose with thermoplastic inner liner has been developed by SPIR STAR® because the standard hoses according to SAE, DIN, EN etc. did not fulfil the requirements regarding pressure, temperature, chemical resistance, permeation, weight, volumetric expansion etc. requested by the customers.
- SPIR STAR® hoses exceed standard hoses in all essential requirements by far.
- To make it possible to produce this unique product, many years of development were necessary. Some manufacturing procedures had to be developed first and existing machinery had to be converted and optimized.
- For that reasons SPIR STAR® high pressure hose cannot be compared with any standard hose according to SAE, DIN, EN etc.
Are our hose assemblies also available with fittings made of V4A stainless steel?
- The decision whether or not V4A stainless steel fittings may be used depends mainly on the working pressure. SPIR STAR® high-pressure hoses are designed for working pressures of up to 3,200 bar. These high pressures make special demands on the mechanical properties (tensile strength, stretch at break etc.) of the fitting material. For our 6 and 8 layer hoses, therefore, we normally use for the nipple high-alloy special steels with a tensile strength of more the 1,000 N/mm². V4A steel does not achieve a tensile strength like this. For that reason the safe use of V4A, particularly with the 6 and 8 layer hoses, in individual cases has to be checked by burst and impulse pressure tests. In any case the use of V4A reduces the service life of a hose assembly. Therefore, V4A should only be used if it is absolutely necessary for the application.
Are we allowed to issue a CE Certificate of Conformity (according to the Directives on Machinery and Machinery working under pressure respectively)?
or
Are we allowed to fix a CE Conformity mark to our hose?
- Our high-pressure hoses do not belong in the scope of application of the Directives on Machinery and Machinery working under pressure respectively. For that reason we must not issue CE Certificates of Conformity or fix a CE Conformity mark to our hose.
- If a customer installs hoses in a machine that is subject to compulsory CE labelling, the manufacturer of the machine has to see to it that all the requirements of the Directive on Machinery as well as any other applicable standards are met, and fix the appropriate label(s).
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