106Vapour handling system and lines

106 Vapour handling system and lines

106 Vapour handling system and lines

(1) A large tanker truck must be fitted with a vapour handling system for the vapour displaced to or from the delivery tank on the truck during loading or unloading operations.

(2) The delivery tank on the large tanker truck must be fitted with a vapour transfer valve connecting the tank to—

(a) a vapour return line fitting, or

(b) a vapour return line that is permanently connected to the delivery tank.

(3) The vapour transfer valve must—

(a) be interlocked so that it is open whenever volatile organic liquid is being transferred to or from the delivery tank on the large tanker truck, and

(b) if the vapour return line is not permanently connected to the delivery tank—be interlocked with the vapour return line fitting so that the vapour return line fitting is closed unless the vapour return line is attached to the fitting.

(4) If the delivery tank on the large tanker truck is not fitted with a permanently connected vapour return line, the truck must not be used unless a vapour return line is carried on the truck that—

(a) does not permit the escape of vapour into the atmosphere, and

(b) is able to securely connect to—

(i) the vapour return line fitting on the delivery tank, and

(ii) the tank or plant to or from which the delivery tank is unloading or loading.

(5) A vapour return line must have an internal diameter of not less than 65% of the internal diameter of the largest liquid transfer line used for loading or unloading the delivery tank on the large tanker truck.