ISO/DIS 6803:2015 pdf free.Rubber or plastics hoses and hose assemblies – Hydraulic- pressure impulse test without flexing.
ISO/DIS 6803 describes hose impulse testing, without flexing, of rubber or plastics hydraulic hose assemblies at both high and low impulse pressures. The high-pressure testing is carried out at pressures greater than 3 MPa and the low-pressure testing at pressures from 1,5 MPa to 3 MPa. The test procedure is applicable to hydraulic hose assemblies that are subject to pulsating pressures in service which are included in the product requirements.
NOTE Impulse test procedures with flexing can be found in ISO 6802, Rubber and plastics hoses and hose assemblies with wire reinforcements — Hydraulic impulse test with flexing.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 3448, Industrial liquid lubricants — ISO viscosity classification
ISO 8330, Rubber and plastics hoses and hose assemblies — Vocabulary
I SO/T R 11340, Rubber and rubber products — Hydraulic hose assemblies — External leakage classification
for hydraulic systems
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 8330 apply.
4 Apparatus
4.1 Pressure-application apparatus, capable of applying an internal pulsating pressure to the test piece at a rate specified in Clause 8.2 using a hydraulic fluid circulating through the test hose, while the fluid is maintained at the required test temperature. Each pressure cycle shall be within the tolerances shown in Figure 2 (for high- pressure testing) or Figure 3 (for low-pressure testing). The nominal rate of pressure rise for high-pressure testing is given by Equation (1) in Figure 2. The rate of pressure rise for low-pressure testing shall be such that the pulse remains within the wave form envelope (see Eigure3).
4.2 Graphical recorder, digital-storage facility or oscilloscope, capable of measuring the pressure cycle to ensure that the wave form is within the envelope shown in Figure 2 or Figure 3. The recorder shall have a natural frequency of more than 250 Hz and shall be critically damped to give a response which is fiat to within 5 % at up to 0,6 times the natural frequency.BS EN ISO 6803 pdf free download.