Temperature cycling test Sample Clauses
A temperature cycling test clause defines the requirement for products or materials to undergo repeated exposure to alternating high and low temperatures to assess their durability and performance under thermal stress. Typically, this involves specifying the number of cycles, temperature ranges, and duration at each temperature extreme, ensuring that the item can withstand real-world environmental changes. The core function of this clause is to verify product reliability and identify potential failures caused by thermal expansion and contraction, thereby reducing the risk of defects in the field.
Temperature cycling test. (a) An unpressurized TPRD is placed in a liquid bath maintained at -40 °C or lower at least two hours. The TPRD is transferred to a liquid bath maintained at +85 °C or higher within five minutes, and maintained at that temperature at least two hours. The TPRD is transferred to a liquid bath maintained at -40 °C or lower within five minutes;
(b) Step (a) is repeated until 15 thermal cycles have been achieved;
(c) With the TPRD conditioned for a minimum of two hours in the -40 °C or lower liquid bath, the internal pressure of the TPRD is cycled with hydrogen gas between 2 MPa (+1/-0 MPa) and 80 per cent NWP (+2/-0 MPa) for 100 cycles while the liquid bath is maintained at -40 °C or lower;
(d) Following the thermal and pressure cycling, the pressure relief device shall comply with the requirements of Leak test (Annex 4, paragraph 1.8.), except that the Leak test shall be conducted at -40 °C (+5/-0 °C). After the Leak test, the TPRD shall comply with the requirements of Bench top activation test (Annex 4, paragraph 1.9.) and then Flow rate test (Annex 4, paragraph 1.10.).
Temperature cycling test. (a) An unpressurized TPRD is placed in a liquid bath maintained at ≤ - 40 °C for at least two hours. The TPRD is transferred to a liquid bath maintained at ≥ +85 °C within five minutes, and maintained at that temperature at least two hours. The TPRD is transferred to a liquid bath maintained at ≤ -40 °C within five minutes;
(b) Step (a) is repeated until 15 thermal cycles have been achieved;
(c) With the TPRD conditioned for at least two hours in the ≤ -40 °C liquid bath, the internal pressure of the TPRD is cycled with hydrogen or inert gas between ≤ 2 MPa and ≥ 80 per cent NWP for 100 cycles while the liquid bath is maintained at ≤ -40 °C;
(d) Following the thermal and pressure cycling, the pressure relief device shall comply with the requirements of Leak test (Annex 4, paragraph 1.8.), except that the Leak test shall be conducted at ≤ -40 °C. After the leak test, the TPRD shall comply with the requirements of the bench top activation test (Annex 4, paragraph 1.9.) and then the flow rate test (Annex 4, paragraph 1.10.).
Temperature cycling test a) An unpressurized TPRD is placed in a liquid bath maintained at -40 °C or lower for at least 2 hours. The TPRD is transferred to a liquid bath maintained at 85 °C or higher within 5 minutes, and maintained at that temperature for at least 2 hours. The TPRD is transferred to a liquid bath maintained at -40 °C or lower within 5 minutes;
b) Step (a) is repeated until 15 thermal cycles have been achieved;
c) With the TPRD conditioned for a minimum of 2 hours in the -40 °C or lower liquid bath, the internal pressure of the TPRD is cycled with hydrogen gas between 2 MPa (+1/-0 MPa) and 80% of NWP (+2/-0 MPa) for 100 cycles while the liquid bath is maintained at -40 °C or lower;
d) Following the thermal and pressure cycling, the pressure relief device shall comply with the requirements of the Leak test, except that the Leak test shall be conducted at -40 °C (+5/-0 °C). After the Leak test, the TPRD shall comply with the requirements of the Bench top activation test and then the Flow rate test.