Document ID: chunk:federal_register_of_legislation:F2023L01530:body:0:p20
Version: federal_register_of_legislation:F2023L01530
Segment Type: other
Provision Reference: 
Character Range: 57463–60389

shall be at or above BPO-10 per cent.
         9.3.2.2. Ambient temperature pressure cycling test in batch testing. The test shall be performed according to paragraph 2.2 (a) to (c) (hydrostatic pressure cycling test) of Annex 3, except that the temperature requirements for the fuelling fluid and the container skin, and the relative humidity requirement, do not apply. The cylinder shall be pressure cycled using hydrostatic pressures  125 per cent of NWP, to 22,000 cycles in case of no leakage or until leakage occurs. For the service life of 15 years, the cylinder shall not leak or rupture within the first 11,000 cycles.
         9.3.2.3. Relaxation provisions
         In the ambient temperature pressure cycling test in batch testing, finished cylinders shall be pressure cycled at a sampling frequency defined as follows:
         9.3.2.3.1. One cylinder from each batch shall be pressure cycled with 11,000 cycles for the service life of 15 years.
         9.3.2.3.2. On 10 sequential production batches of the same design, should none of the pressure cycled cylinders leak or rupture in less than 11,000 cycles x 1.5 for the service life of 15 years, then the pressure cycling test can be reduced to one cylinder from every 5 batches of production.
         9.3.2.3.3. On 10 sequential production batches of the same design, should none of the pressure cycled cylinders leak or rupture in less than 11,000 cycles x 2.0 for the service life of 15 years, then the pressure cycling test can be reduced to one cylinder from every 10 batches of production.
         9.3.2.3.4. Should more than 6 months have expired since the last batch of production, then the sampling frequency for the next batch of production shall be that specified in paragraph 9.3.2.3.2. or 9.3.2.3.3. above.
         9.3.2.3.5. Should any cylinder tested at the sampling frequency in paragraph 9.3.2.3.2. or 9.3.2.3.3. above fail to meet the required number of pressure cycles, then it shall be necessary to repeat the pressure cycling test at the sampling frequency in paragraph 9.3.2.3.1 above for a minimum 10 production batches. The sampling frequency for testing thereafter shall be that specified in paragraph 9.3.2.3.2. or 9.3.2.3.3. above.
         9.3.2.3.6. Should any cylinder tested at the sampling frequency in paragraph 9.3.2.3.1., 9.3.2.3.2. or 9.3.2.3.3. above fail to meet the minimum requirement regarding the number of pressure cycles (11,000 cycles), then the cause of failure shall be determined and corrected following the procedures in paragraph 9.3.2.3.7.
         The pressure cycling test shall then be repeated on an additional three cylinders from that batch. Should any of the three additional cylinders fail to               meet the minimum requirement regarding the number of pressure cycles (11,000 cycles), then all cylinders of this batch shall be rejected.
         9.3.2.3.7. In the event of failure to meet