... 56 inch, thickness 0.3 to 1.6 inch. DSAW pipe is dual submerged arc welding pipe, also named SAWL(longitude submerged arc ... for oil, gas, nature gas, water and other high pressure pipe lines for onshore projects, offshore projects, chemical industry, city gas ... and water supply line.1. Certification: API Spec 5L, CE PED, ISO 9001, ISO14001, OHSAS 18001 ...