Tensile and bending tests
88.—(1)  A tensile test shall be made from the plates from which the tubes are made. The ultimate strength of the material shall not exceed 28 tons per square inch, with an elongation of 25% on a length of 8 inches for material ⅜ inch in thickness and upwards. The elongation of material under ⅜ inch in thickness may be 3% less than 25% for each one-eighth of an inch below ⅜ inch in the thickness.
(2)  The bending tests shall be as prescribed in rule 57(1) for boiler plates.