Naylor Spiral Buttweld Pipe features two welds along the spiral seam. This creates a pipe structure in which the weld is as strong or stronger than the parent metal. Naylor Spiral Buttweld Pipe is available in diameters from 6” to 96” and wall thicknesses up to 1/2". Naylor Spiral Buttweld Pipe 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.