Specification of ductile iron double flanged pipe
1) Centrifugally cast pipes with welded-on flanges
DN700 to DN1600: K9 for PN 10, PN 16 and PN25
2) Centrifugally cast pipes with screwed-on flanges
DN700 to DN1200: K10 for PN10, PN16 and PN25
3) Pipes with integrally cast flanges
DN1800 to DN2600: K12 for PN10 and PN16
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