PED & ISO 9001:2000 certified 3.1 and 3.2 certificate oil and gas pipe flange ,galvanized pipe ... flange ,hydraulic pipe flange 1. Type: oil and gas pipe flange,galvanized pipe flange,hydraulic pipe ... ANSI, JIS, BS, DIN, UNI, EN, GB, AWWA, API, MSS,4. Size: 15 mm to 5000 mm5. Pressure: ... Requirement7. Painting: yellow varnish, black paint. Rust oil and Zn plate8. Inspection: in-house and the third ...