Storage Tank Systems for Petroleum Products and Allied Petroleum Products Regulations

17 (1) The owner or operator of a storage tank system installed before the coming into force of these Regulations that has single-walled underground piping must test that piping using a piping precision leak detection test in accordance with section 24 within two years after the day on which these Regulations come into force and after that test they must

• (a) immediately

  • (i) use continuous external underground pipe leak monitoring,

  • (ii) use automatic tank gauging in accordance with section 18, or

  • (iii) use continuous in-tank leak detection in accordance with section 20; or

• (b) annually perform a piping precision leak detection test in accordance with section 24.

(2) The continuous external underground pipe leak monitoring must

• (a) be carried out using a sensor cable system designed for installation adjacent to the piping and within the same pipe trench;

• (b) be capable of detecting a leak rate of at least 0.38 L/h within 96 hours after the onset of the leak at the lowest expected soil temperature at the site where the sensor cable system is installed;

• (c) be capable of locating the leak with an accuracy of ± 1 m;

• (d) be capable of continuously monitoring sensor cable system integrity; and

• (e) have an alarm located at a place of work where it can be readily heard and seen.