ARM 36.21.642
ARM 36.21.642. STEEL CASING JOINTS
Cite as Mont. Admin. R. 36.21.642
(1) All casing joints shall be welded or screw coupled and shall be watertight. If welded casing joints are used, the weld shall be a full penetrating weld at least equal in thickness to the wall thickness of the casing. Welded casing joints shall have a tensile strength equal to or greater than that of the casing.