This part of GB/T 17241 specifies the type and size of integral gray cast iron, malleable cast iron and nodular cast iron flanges with nominal pressures of PN2.5, PN6, PNIO, PN16, PN25, PN40 and Class150, Class300. This part applies to the design, manufacture and acceptance of gray cast iron, malleable cast iron and nodular cast iron integral cast iron flanges of DNl0~DN4000.
GB/T 17241.6-2008 Referenced Document
GB/T 17241.7 Specifications for cast iron pipe flanges