BS EN ISO 19879:2021 pdf free

BS EN ISO 19879:2021 pdf free.Metallic tube connections for fluid power and general use – Test methods for hydraulic fluid power connections.
For all tests, except the repeated assembly and overtightening tests, tube connections and stud ends shall be tested at the required minimum torques or number of hex flats or turns from finger-tight position given in the respective connector standard, if specified. Otherwise, they shall be tested at the minimum torque values or number of hex flats or turns from finger-tight position supplied by the manufacturet For test assembly type 2 and type 3 adjustable stud torques shall be applied after being backed out one full turn from finger-tight, In order to test correctly the worst possible actual assembly conditions.
4.3.3 Temperature
Foralltests,thetemperatureofthehydraulicfluldshallbebetween 15°Cand8Otunlessotherwlse
specified in the respective connector standard.
4.4 Test report
Test results and test conditions shall be reported.
NOTE ISO/TR 11340 provides a method of reporting leakage.
5 Repeated assembly test
5.1 PrincIple
Unless otherwise specified In the respective connector standard, three type I test assemblies shall be tested to confirm that they are capable of meeting the necessary requirements after being disassembled and re-assembled several times.
52 Procedure
The tube connections of the straight stud connector (part A in FIgure 1) and shaped connector (part C in FIgure 1) shall be disassembled and re-assembled six times. Prior to each re-asseml4 the tube shall be turned clockwise by6O On re-assembly, the nuts shall be tightened firmly, using the maximum torque values or number of turns given in the respective connector standard or by the manufacturer. All assemblies, after the first and sixth re-assembly, shall be subjected to a leakage test (flse 6) and a proof test (Clause 7) at the test parameters specified in Thhle 2.
5.3 Re-use of components
Parts that pass this test may be used for burst and cycle endurance tests at the minimum specified assembly torque or number of turns. They shall not be used for actual service or returned to stock.
6 Leakage test
6.1 Principle
Unless otherwise specified in the respective connector standard, all type 1 test assemblies from the repeated assembly test and, where applicable, three type 2, type 3 or type 4 assemblies shall be subjected to a leakage test to ensure that assemblies do not leak when subjected to test pressure.
6.2 Procedure
Test assemblies shall be pressurized under water as shown in Figure 5 and described in Table 3.BS EN ISO 19879 pdf free download.