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Deal reached on ammonia nurse tanks

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An agreement has been reached that will allow ammonia nurse tanks to continue to be used this spring if they meet certain conditions.

New Transport Canada regulations were to take effect Jan. 12 requiring implementation of Canadian Standards Association B620/622-14 standards. They increase the frequency for hydrostatic testing and for visual inspections, and set new requirements for the construction of new nurse tanks.

The agreement adjusts the pressure testing frequency back to five years for nurse tanks that are post-weld heat treated and have a Maximum Allowable Working Pressure of 265 psi (or 250 psi if purpose built for ammonia).

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