BS 4504 BLANK FLANGE, BLIIND FLANGE RAISED FACE PN6, PN10, PN16, PN25, PN40 British Standard BS 4504 : Māhele 3.1 : 1989 - Nā Puʻupuʻu Poʻa no nā Pipes, Valves a me nā Pono (PN i koho ʻia), kikoʻī no nā hao hao.Hoʻopili kēia i nā flanges i nā pae kaomi nominal PN 2.5 a i PN 40 a me n...
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