I-BS 4504 BLANCE FLANGE, BLIIND FLANGE RAISED FACE PN6, PN10, PN16, PN25, PN40 British Standard BS 4504 : Isigaba 3.1 : 1989 – Ama-Circular Flanges for Pipes, Valves and Fittings (PN Specifications for Designated).Lokhu kuhlanganisa ama-flange kububanzi bengcindezi ebizwa ngokuthi i-PN 2.5 ukuya ku-PN 40 kanye ne-n...
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