147Vent pipe

147 Vent pipe

147 Vent pipe

(1) A petrol storage tank must have a petrol storage tank vent pipe.

(2) The vent pipe must have a pressure vacuum valve or a similar device that—

(a) is certified by the manufacturer as—

(i) meeting the pressure specifications and total leak rates set out in CP–201, sections 3.5.1 and 3.5.2, and

(ii) otherwise conforming with a standard that is—

(A) applicable to the valve or device, and

(B) published by a relevant standards authority, and

(b) is, in the opinion of a qualified person, a suitable size and type and possesses suitable safety features for use in the vent pipe, and

(c) is of a size and weight to allow an emergency release of vapour at not more than 80% of the maximum pressure for which the tank was designed to withstand, and

(d) has been installed as advised by a qualified person.

(3) If a device other than a pressure vacuum valve is used the device must also—

(a) provide emergency relief of pressure or vacuum, and

(b) have a volume flow rate when venting that is sufficient to ensure the pressure or vacuum is not more than that for which the tank is designed, and

(c) be certified by the manufacturer as providing a seal against leakage when the device is closed with at least the same performance as the leak test set out in TP–201.1E.

(4) The vent pipe must also have a 10mm orifice or a similar device that—

(a) is arranged so that the pressure vacuum valve or other similar device would continue to operate if the orifice were to become blocked, and

(b) for a device other than an orifice—is certified by the manufacturer as retaining at least 97% of vapour in the system.

(5) In this section—

CP–201 means CP–201Certification Procedure for Vapor Recovery Systems at Gasoline Dispensing Facilities published by the California Air Resources Board.

TP–201.1E means TP–201.1ELeak Rate and Cracking Pressure of Pressure/Vacuum Valves published by the California Air Resources Board.