BS EN ISO 6803-2015 pdf download.Rubber or plastics hoses and hose assemblies – Hydraulicpressure impulse test without flexing.
8 Procedure
8.1 Connect the test pieces to the apparatus. The test pieces shall be installed in accordance with Figure
1, i.e. test pieces of hose of nominal inside diameter up to and including 22mm shall be bent through 180°
and hoses of nominal inside diameter larger than 22 mm shall be bent through 90°.
8.2 Bring the test fluid to the test temperature and then apply a pulsating pressure internally to the hose assemblies at a uniform rate between 0,5 Hz and 1,3 Hz for the high-pressure test and between 0,2 Hz and 1,0 Hz for the low-pressure test. Record the pulse rate used. The pressure cycle shall fall within the shaded area of either Figure 2 or Figure 3. depending upon the test pressure. Continue the test for the specified number of cycles or until an assembly fails. If a test is stopped before completion of the minimum number of cycles and then restarted, leakage may occur at the hose/fitting junction upon restarting the test and until the test temperature is reached. Leakage less than class 4 as defined in ISO/TR 11340 does not constitute a failure of the hose assembly. Any leakage shall be reported in accordance with the classification in ISO/TR 11340.
If the cool down leakage test is required then carry out the following test procedure:
The impulse test unit shall be shut down at 40 % ±10 % and 90 % ±10 % of the required number of impulse cycles and allowed to cool until the test oil and hose assemblies reach a temperature of 30 °C ± 3 (85 °F ± 5). Accelerated cool down procedures. i.e. fans, heat exchangers. etc., may be used to speed the cooling process.
Check test assemblies to assure they are clean and dry. With oil heater turned off, resume the test and observe and note leakage for 1000 impulse cycles.
Determine the duration required for the impulse test, in total number of cycles, from the referring standard. Where agreed samples are required, refer to the relevant hose or hose assembly standard.
It is recommended that the test fluid be changed frequently to prevent breakdown.
NOTE This is a destructivetest. Assemblieswhich haveheen subjected tothis test, should therefore be discarded.
9 Expression of results
Record the number of cycles to failure or, if failure did not occur, the number of cycles completed.
NOTE The test results obtained are only valid for the combination of hose, fitting type and fitting design that wis actuiIIy tested.BS EN ISO 6803 pdf download.