SECTION 69
STATE OF THE GAS DISTRIBUTION SYSTEM
SECTION 215
EVALUATION OF UNPROTECTED STEEL TANK CONDITION
(1) The soil aggressiveness value (S.A.V.) is determined according to the method of the Petroleum Association for Conservation of the Canadian Environment.
(2) The tank/soil index (T/S) is determined by multiplying the soil aggressiveness value by the age of the tank. T/S = (S.A.V. x AGE).
(3) On the basis of the values obtained, the requirements to be met are as follows (see Graph):
Zone 1
The tank may be protected against corrosion according to NACE Standard SP0169, Control of External Corrosion on Underground or Submerged Metallic Piping Systems or NACE Standard SP0285, Corrosion Control of Underground Storage Tank Systems by Cathodic Protection, published by NACE International;
Zone 2
The tank must be replaced before the tank reaches 25 years after its installation;
Zone 3
The tank must be replaced before the tank reaches 25 years after its installation and subject to a leak detection test in accordance with the second paragraph of section 8.130 of Chapter VIII of the Construction Code (chapter B-1.1, r. 2) within 12 months as of the year of assessment of its condition and every 5 years afterward;
Zone 4
The tank must be replaced before obtaining a T/S of 180 or before the tank reaches 25 years after its installation and subject to a leak detection test in accordance with the second paragraph of section 8.130 of Chapter VIII of the Construction Code every year;
Zone 5
The tank must be replaced immediately.