CPA Public Affairs

External Inspection of TC 331 Tanks

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When corrosion is noted during the annual external inspection of TC 331 tanks and equivalent tanks, the following CSA B620-09 requirements apply:  
  • 7.2.1 External inspections
    • Clause – External inspections shall include the following: (a) without removing insulation or jacketing, checking for corroded areas, etc.
    • Clause – Corroded or abraded areas of the tank wall shall have their thickness tested in accordance with Clause 7.2.6.
  • 7.2.6 Thickness test
    •  Clause Consequences of rejection
      • – Except as provided for in Clause, a tank rejected for insufficient thickness shall (a) not be used in dangerous goods service; and (b) not display a metal identification plate identifying it as a TC, MC or DOT specification tank.
      • – A tank that has been rejected for insufficient thickness may be returned to dangerous goods service with modified minimum thickness or loading parameters if it fulfills the requirements of Clauses 8.2 to 8.4 for modified tanks.

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