Astm A252 Standard Specification For Welded Steel Pipe Piles Ssaw Steel Pipe

This specification covers nominal (average) wall steel pipe piles of cylindrical shape and applies to pipe piles in which the steel cylinder acts as a permanent load-carrying member, or as a shell to form cast-in-place concrete piles.The material shall conform to the requirements as to tensile properties prescribed in Tables 1 and 2.The yield point shall be determined by the drop of the beam, by the halt in the gage of the testing machine, by the use of dividers, or by other approved methods.

When a definite yield point is not exhibited, the yield strength corresponding to a permanent offset of 0.2 % of the gage length of the specimen,or to a total extension of 0.5 % of the gage length under load shall be determined.Outside Diameter—The outside diameter of pipe piles shall not vary more than 61 % from the specified outside diameter.Wall Thickness—The wall thickness at any point shall not be more than 12.5 % under the specified nominal wall thickness.Surface imperfections having a depth not in excess of 25 % of the specified nominal wall thickness shall be acceptable. It shall be permissible to establish the depth of such imperfections by grinding or filing.

A retest shall also be allowed if any part of the fracture is in an inside or outside surface imperfection.The tension test specimens and test methods shall be in accordance with Test Methods and Definitions A370, For helical-seam pipe piles, any longitudinal strip test specimens shall be taken from the pipe parallel to the pipe axis and at such a location that the center of the specimen is located at least a quarter of the distance between adjacent weld convolutions, or from the skelp at a corresponding location and orientation; and transverse specimens shall be taken from the pipe 90° to the pipe axis and at such a location that the center.