Hydraulic test. The tank shall be subjected to a hydraulic internal pressure test which shall be carried out on an isolated unit complete with all its accessories. The tank shall be completely filled with a non-flammable liquid (water, for example). After all communication with the outside has been cut off, the pressure shall be gradually increased, through the pipe connection through which fuel is fed to the engine, to a relative internal pressure equal to double the working pressure used and in any case to not less than an excess pressure of 30 kPa (0.3) bar, which shall be maintained for one minute. During this time the tank shell shall not crack or leak; however, it may be permanently deformed.
Hydraulic test. The containers representative of the type of container submitted for approval (without accessories but with the outlets closed off) shall withstand an inner hydraulic pressure of 3,000 kPa without leakages or becoming permanently distorted, according to the following requirements:
Hydraulic test. One of the following two options shall be used:
Hydraulic test. One of the following two options shall be used: Option 1: Water jacket test
Hydraulic test. One of the following two options shall be used:
Option 1: Water jacket test
(a) The cylinder shall be hydrostatically tested to at least 1.5 times working pressure. In no case may the test pressure exceed the auto-frettage pressure;
(b) Pressure shall be maintained for a sufficiently long period (at least 30 seconds) to ensure complete expansion. Any internal pressure applied after auto-frettage and previous to the hydrostatic test shall not exceed 90 per cent of the hydrostatic test pressure. If the test pressure cannot be maintained due to failure of the test apparatus, it is permissible to repeat the test at a pressure increased by 700 kPa. Not more than 2 such repeat rests are permitted;
(c) The manufacturer shall define the appropriate limit of permanent volumetric expansion for the test pressure used, but in no case shall the permanent expansion exceed 5 per cent of the total volumetric expansion measured under the test pressure. For type CNG-4 designs, the elastic expansion shall be established by the manufacturer. Any cylinders not meeting the defined rejection limit shall be rejected and either destroyed or used for batch test purposes.
Option 2: Proof pressure test The hydrostatic pressure in the cylinder shall be increased gradually and regularly until the test pressure, at least 1.5 times working pressure, is reached. The cylinder test pressure shall be held for a sufficiently long period (at least 30 seconds) to ascertain that there is no tendency for the pressure to decrease and that tightness is guaranteed;
Hydraulic test. The specials (Fittings / Castings) shall be tested at works for hydraulic test pressure in accordance with Clause 10 of IS: 9523. Minimum Hydraulic test pressure at works shall be 2.5 MPa for fittings up to and including 300 mm diameter and 1.6 MPa for fittings over 300 mm up to and including 600 mm diameter. Hydraulic testing shall be carried out prior to application of surface coating and lining except Zinc coating, which may be applied before the hydraulic test.
Hydraulic test pressure
Hydraulic test pressure and appointment of the minimum burst-pressure
Hydraulic test. 2.3.1. The containers representative of the type of container submitted for approval (without accessories but with the outlets closed off) shall withstand an inner hydraulic pressure of 3,000 kPa without leakages or becoming permanently distorted, according to the following requirements:
2.3.2. The water pressure in the container must increase at an even rate until the test pressure of 3,000 kPa is reached.
2.3.3. The container must remain under the test pressure long enough to make it possible to establish that the pressure is not falling off and that the container can be guaranteed leakproof.
2.3.4. After the test the container must show no signs of permanent deformation.
2.3.5. Any container tested which does not pass the test must be rejected.
Hydraulic test. Surface Treatment after Fabrication and Pre-delivery Inspection *** *** CONFIDENTIAL TREATMENT REQUESTED. CONFIDENTIAL PORTIONS HAVE BEEN REDACTED AND FILED SEPARATELY WITH THE COMMISSION.
