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Standards:

Design & Manufacture: ANSI16.34,BS 5155,JIS B2071,DIN 3354.

Face-to-face Dimension: API 609, ISO 5752,DIN 3202,BS 4504,JIS B2002 .

Flanged Ends: ANSI B16.5, MSS-SP-44, ISO 7005 ,BS 4504.

Butt-weld Ends: ANSI B16.25.

Pressure Test: API 598, ISO 5208, BS 5146.