Standard for External Corrosion Protection Systems for Steel Underground Tanks for Flammable and Combustible Liquids

1 SCOPE

1.1 This Standard covers requirements for external corrosion protection systems on steel non-pressure

tanks that are used for the underground storage of flammable liquids and combustible liquids. The

requirements are structured as follows:

A Section 5, Cathodically Protected Tanks, covers external corrosion protection using sacrificial

magnesium and zinc anodes, low profile nylon isolating bushings with internal and external

threads and component thread sealant, electrical isolation and thin film dielectric coating

(cathodically protected tank);

NOTE: Informative material on zinc reference electrodes is included in Appendix B, Methods For Monitoring

Cathodically Protected Tanks.

B Section 6, Composite Tanks (Clad), covers external corrosion protection using dielectric fibre

reinforced plastics or resins that are bonded to the tank (composite tank — clad);

C Section 7, Jacketed Tanks, covers external corrosion protection and secondary containment

using dielectric jackets (jacketed tanks); and

NOTE: Jacketed tanks as described in this Standard are also considered to be double walled.

D Section 8, Coated Tanks, covers external corrosion protection using polyurethane (coated

tanks).

1.1.1 These external corrosion protection systems are intended to be installed, operated and maintained

in accordance with the manufacturer’s instructions.

1.2 These requirements cover external corrosion protection systems for steel tanks manufactured in

accordance with the applicable requirements of CAN/ULC-S603, Standard for Steel Underground Tanks

for Flammable and Combustible Liquids, which are used for the underground storage of flammable liquids

and combustible liquids that are compatible with the materials of construction.

1.3 This Standard does not cover requirements for the installation, maintenance and use of the tank.

Tanks covered by these requirements are intended for installation and use in accordance with the

authority having jurisdiction and other documents including but not limited to:

A CCME PN 1326 Environmental Code of Practice for Aboveground and Underground Storage

Tank Systems Containing Petroleum Products and Allied Petroleum Products;

B The National Fire Code of Canada; and

C CSA B139, Installation Code for Oil-burning Equipment.