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Flanged Pipe Type	Diameter Range and Lengths	PN Ratings
Welded Flanged Pipes	From 80DN to 1000DN lengths up to 5.0 m.	PN 10, PN 16, PN 25, PN 40
Screwed Flanged Pipes	From 80DN to 300DN diameter, in lengths up to 5.0 m.	PN 10, PN 16
Cast Flanged Pipes	From 80DN to 200DN up to 700mm length and 250DN to 700DN up to 1.2 m length	PN 10, PN 16, PN 25, PN 40

Buried installation of flanged pipe is not recommended.
Flanged joint being a rigid joint, perfect alignment of the flange faces during jointing and bolt tightening is absolutely vital.
Use of duck foot bend at bottom of vertical flange pipe line is necessary.
For high pressure application, flanged pipeline needs thrust block or support at bends / tees.