What is the breaking strength (resistance to breaking) of a hose? How strongly may you pull a hose?

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.

SPIR STAR™ hose type XY already fulfills the impulse test requirements of the new upcoming standard prEN 1829-2 (>20.000 cycles at working pressure).


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 fulfill 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 reason 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 (46,400 psi). 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 high-alloy special steels with a tensile strength of more the 1,000 N/mm² for the nipple. 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.