1) Bolted cover 2) Flanged or butt-welded ends 3) Standards compliance 4) Design and manufacture: API 6D, BS1868, ASME B16.10 5) Face-to-face dimension: API 6D 6) End flange: ASME B16.5 7) Inspection and test: API 598, API 6D 8) NPS: 2"-48" 9) Pressure: class 150lbs-2,500lbs 10) Material: WCB, WCC, LCB, LCC, WC6, WC9, C5, C12, CF8, CF8M, CF3, CF8C, CN7M