ISO 4548-6:2021 Methods of test for full-flow lubricating oil filters for internal combustion engines — Part 6: Static burst pressure test

ISO 4548-6:2021 Methods of test for full-flow lubricating oil filters for internal combustion engines — Part 6: Static burst pressure test.
6.1.5 Raise the pressure gradually to 200 kPa, maintain for about 1 mm, and check the filter and all fittings for leaks.
NOTE The first pressure increment can be 50% of the specified objective pressure, if it is judged to be safely attainable.
6.1.6 Now raise the pressure at a controlled pressure ramp up to approximately 100 kPa per 10 s and maintain for approximately 15 s and check filter for leaks or distortion.
6.1.7 Continue raising the pressure at approximately 100 kPa per 10 s intervals with a 15 s check until a specified [see 7 g)J pressure objective is reached as determined by the customer, or otherwise failure occurs.
6.1.8 Relieve the pressure to zero. Check the filter for permanent distortion and tightening torque or angle of rotation.
6.1.9 Take note of the remaining tightening torque or angle of rotation. If loosening has occurred, restore the initial value prior to determination of the filter failing pressure specified in 62. If the filter failed during the verification that filter meets technical requirements, then filter failing pressure has already been determined.
6.2 Determination of the filter failing pressure
6.2.1 Gradually apply pressure until the objective pressure is reached, then proceed gradually in increments of approximately 100 kPa per 10 s and maintain for approximately 15 s until ultimate failure occurs. 5 % of the burst pressure may be used as the pressure rise value in place of 100 kPa.
6.2.2 Examine the filter for details of the failure mode.
7 Report of test results
The test report shall indicate at least the following:
a) a reference to this document, i.e. ISO 4548-6:202 1;
b) test establishment;
c) filter type (manufacturer model No. and batch No.);
d) date of test;
e) a description of the filter, whether it is new or used (in the latter case, approximate period of service);
f) the torque or angle of rotation applied initially (see 61d);
g) the specified pressure objective as determined by the customer and whether reached (see 6.1.6);
h) the remaining tightening torque or angle of rotation (see 612);
i) visible permanent distortion (see 612);
j) the burst pressure (see 6,18);
k) the mode of failure and its location.
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