1. API 5L, ISO 9001, ISO14001, OHSAS 18001, CE PED certification. 2. OD 16to 56 inch, thickness 0.3 to 1.6 inch. DSAW ... , offshore projects, chemical industry, city gas and water supply line.1. Certification: API Spec 5L, CE PED, ISO 9001, ISO14001, OHSAS 18001 ... .2. Material grade: API 5L Gr.B-X80.3. Standard: API Spec 5L, GB9711.1-97(Chinese)4. Specification: Length: 8-12 ...