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Division 4.2.2.2.4 Pressure regulators

Original text. Later amendments are not shown.

  1. (a)

    The pressure regulator shall be connected to a source of leak test gas at nominal working pressure and cycled through 95 per cent of the number of duty cycles calculated in accordance with section 2.7.7. One cycle shall consist of flow until stable outlet pressure has been attained, after which the gas flow shall be shutoff by a downstream quick closing valve until stable lockup pressure has been achieved. The pressure regulator shall then fulfil the requirements of the internal and external leakage tests (sections 4.2.4. and 4.2.5. respectively) conducted at ambient temperature;

  2. (b)

    The inlet of the pressure regulator shall be pressure cycled through 1 per cent of the number of duty cycles from nominal working pressure to 0,5 times the nominal working pressure or less. Subsequently the pressure regulator shall fulfil the requirements of the internal and external leakage tests (sections 4.2.4. and 4.2.5. respectively) conducted at ambient temperature;

  3. (c)

    The cycling procedure in (a) above shall be repeated at the maximum material temperature in accordance with section 2.7.5.1. and at 1,25 times the nominal working pressure for 1 per cent of the number of duty cycles. Subsequently the pressure regulator shall fulfil the requirements of the internal and external leakage tests (sections 4.2.4. and 4.2.5. respectively) conducted at the maximum material temperature;

  4. (d)

    The cycling procedure in (b) above shall be repeated at the maximum material temperature and at 1,25 times the nominal working pressure for 1 per cent of the number of duty cycles. Subsequently the pressure regulator shall fulfil the requirements of the internal and external leakage tests (sections 4.2.4. and 4.2.5. respectively) conducted at the maximum material temperature;

  5. (e)

    The cycling procedure in (a) above shall be repeated at the minimum material temperature in accordance with section 2.7.5.1. and at nominal working pressure for 1 per cent of the number of duty cycles. Subsequently the pressure regulator shall fulfil the requirements of the internal and external leakage tests (sections 4.2.4. and 4.2.5. respectively) conducted at the minimum material temperature;

  6. (f)

    The cycling procedure in (b) above shall be repeated at the minimum material temperature and at nominal working pressure for 1 per cent of the number of duty cycles. Subsequently the pressure regulator shall fulfil the requirements of the internal and external leakage tests (sections 4.2.4. and 4.2.5. respectively) conducted at the minimum material temperature.