Benoil Services Ltd

Testing Development - Further details of the test cell
The test cell is designed to replicate the conditions of the tool in which the burst discs will be used. This is both in terms of the geometry within the 'ports' for example as well as the temperature / pressure environment. Each of the burst discs sits in the tool on its own O-ring (as it does in the tool). The clamp load on the disc and seal rings is achieved by the draw bolts.
Section #6 chamber unloaded Section #6 chamber loaded Sections #2 to #6 are sealed with an O-ring in a groove to the next #section. The complete assembly is held together with the draw bolts to be seen above. It is these O-rings that retain the working fluid within the cavities of the test cell.
Fig1: More detailed view of section #6
Section #5 chamber unloaded Section #5 chamber loaded The #5 section can be seen here both in the loaded and unloaded states. The breather pipe can also be seen along with the gallery connections that ensure there is no pressure differential within the test cavity. The breathers allow the pressure to equalise - ensuring the pressure the disc 'sees' is the target pressure.
Fig2: More detailed view of section #5
The sections #5, #4, #3 and #2 are all identical and simply stand head and shoulders on top of each other. Statistical certainty requires a miniumum of 5 to be tested to ensure the repeatability of results.
The breather in #6 is a high pressure hydraulic connection, should a reverse burst be required. For the cycling test however it is 'open' and acts as a breather.
Individual burst tests can be achieved - at temperature if required, or ambient if not - by connecting cells #1 and #6 directly together.
Section #6 chamber unloaded The endplate provides the hydraulic connection to sections #2 to #6 of the test cell via the oil galleries shown. For ease of test the working fluid is a standard light-hydraulic oil and all the test cell components, hydraulic connections and pipework are SS316
Fig3: More detailed view of section #1
Section #5 chamber unloaded Section #5 chamber loaded The finished discs are domed with approx 25% of the burst pressure in the the direction the discs are to be used in service.
This last operation allows us to do a 100% inspection leak-test check, as well as dome each disc.
Fig4: Finished burst discs

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