ISO 5782-2-1997 pdf download – Pneumatic fluid power一. Compressed air filters – Part 2: Test methods to determine the main characteristics to be included in supplier’s literature.
6 Test procedure to verify rated pressure 6.1 Perform this test on three random samples with a proposed rated pressure for the product. 6.2 In this test, the product-sealing means can be modified to prevent leakage and allow structural failure to occur; but modifications must not increase the structural strength of the pressure-containing envelope. 6.3 Fill samples with a liquid of viscosity that does not exceed Iso VG 32, according to ISO 3448, and install them in the temperature environment described in 5.1. 6.4 After stabilizing the temperature, pressurize slowly to a level of 1,5 times the proposed rated pressure. Hold at this level for 2 min and observe for leakage or failure (as defined in 6.6). 6.5 If there is no leakage or failure, increase the pressure by approximately half of its proposed rating. Hold at this pressure for 2 min and observe for leakage or failure (as defined in 6.6). If there is still no leakage or failure, in terms of the following units: a) units constructed of light alloys, brass and steel, continue raising the pressure as above until a level of 4 times the proposed rated pressure has been reached;
6.6 Criteria for a failure are a fracture, a separation of parts or a crack, or any phenomenon which can pass liquid across the pressure-containing envelope sufficiently to wet the outer surface. Leakage across the port threads may not constitute a failure unless caused by a fracture or crack. 6.7 The proposed rated pressure will be verified if all three samples pass the test. 6.8 Where a unit or sub-assembly in the unit (e.g reservoir/sight-glass) is constructed of different materials, the highest appropriate factor should be used. The applied pressure may be restricted to the area of the interface between the different materials. 6.9 Where the design of the pressure-containing envelope is covered by a pressure vessel code in the country of sale, the requirements of that code take precedence over the requirements stated in this part of Iso 5782. 7 Flow-rate tests 7.1 The test circuit shall comply fully with the one described in ISO 6358:1989, figure 1, table 3 and 5.3. 7.2 The measuring tubes shall comply fully with those described in ISO 6358:1989, figure 3, table 4 and 5.4 and 5.5. 7.3 Each series of results obtained for a specified test condition shall be recorded as soon as a steady- state condition has been reached. Recording shall be carried out with care and with a sufficiently slow period of change in conditions to avoid a drift in the steady-state characteristic. A periodic check shall be made to verify that no pressure intakes of the measuring instruments are blocked by solid or liquid particles.