# Commission Regulation (EU) No 406/2010 of 26 April 2010 implementing Regulation (EC) No 79/2009 of the European Parliament and of the Council on type-approval of hydrogen-powered motor vehicles (Text with EEA relevance), Division 4.2.2.2.5: Pressure relief devices


(a)Creep test
Pressure relief devices shall be hydrostatically pressurised to 1,25 times nominal working pressure and held for 500 hours at a temperature (TL) calculated from the following equation:
TL = T (0,057) (0,34 log(T/Tf))
where
TLTest temperature, °C
TfActivation temperature of the pressure relief device, °C
T82 °C
Log is base 10.
Pressure relief devices shall not show signs of deformation caused by creep and shall fulfil the requirements of the internal leakage test (section 4.2.4.) after being subjected to the above test;
(b)Activation temperature
Following the creep test in a) above, the pressure relief devices shall be pressurised with dry air, nitrogen, helium or hydrogen to nominal working pressure. Subsequently the pressure relief devices shall be exposed to an increasing temperature cycle starting from ambient temperature with a rate not exceeding 10 °C per minute until the specified activation temperature minus 10 °C is reached and then with a rate of not exceeding 2 °C per minute until the pressure relief devices activate. The activation temperature shall be within a range of ± 5 per cent of the manufacturer’s specified activation temperature. After activation the pressure relief devices shall show no evidence of fragmentation.

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Source: https://www.legislation.gov.uk/eur/2010/406/annex/IV/part/3/division/4/division/4.2/division/4.2.2/division/4.2.2.2/division/4.2.2.2.5 (the official version)
Page: https://openlegislation.uk/eu-regulation-2010-406/annex-IV/part-3/division-4/division-4.2/division-4.2.2/division-4.2.2.2/division-4.2.2.2.5
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.