1.the manufalture and aueptanle specification shan be based on the japaness standard E101 applied for the thermal power and JB/T3595-93. 2.the length shan be in line with E101 or by user??s specification. 3.welding groove shan be in accordance with power industry specification 78DG or hg user??s specification. 4.the size in inclose in old production??s size. 5.100~350DN(mm).
