Naylor Spiral Buttweld Pipe is manufactured in accordance with ASTM A-139; ASTM A-252, and AWWA C200. It is made from steel strip on automatic equipment designed by Naylor that forms, sizes and completes the manufacture; first, by a sound initial penetrating weld, then followed by a second weld along the outside spiral seam. Each length of completed Naylor Spiral Buttweld Pipe is carefully inspected, and where service conditions require, a hydrostatic test is given to ASTM requirements as shown on pages 3, 4 and 5.