M-13.1, r. 1 - Regulation respecting petroleum, natural gas and underground reservoirs

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34. Steel pipes must:
(1)  be placed under a blowout preventer valve;
(2)  be equipped with a control valve;
(3)  have a diameter over 50 mm and be capable of supporting a continuous pressure equal to that of the blowout control system.
O.C. 1539-88, s. 34.