API spiral pipe 1.Certificate:ISO,API 2.Delivery time:20 days 3.Advantage:technique,price and high quality 4.OD:219-2500mm API spiral ... 2,500mm Wall thickness: 6 to 29.36mm Length: customizedStandards: API 5L, API 5CT, ASTM A106, ANSI, ISO9001, and DIN EN Treatment ... piles, steel structure buildings, steel structure bridges, seaports, and docks API spiral pipe