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Now I am working on a sludge incineration project, in this project, from WHB to ESP, from ESP to bag filter etc, we use flue gas duct, I want to know which standard I can use to design these ducts, thanks!

ASTM D1785 is used for water, I want to know if I can use this standard pipe for acid/alkali etc corrosive fluid. Thanks!

for EN 1092-1 PN250 TONGUE GROOVE FLANGE, who know the EN gasket standard? In EN 1514-2, the PN is only up to PN160, the flange facing only limit to FF and RF. thanks!

who know if America or European have thermoplastic piping design and installation standard? thanks!

for negative pressure air pipe, how to calculate the wall thickness as per negative pressure value?

for soft seat wafer butterfly valve, can the connecting flange on piping be a slip on flange? some valve vendor suggest to use special flange for soft seat wafer butterfly valve. Can we use weldneck flange instead of special flange?

when we design UPVC piping, do we need to select the pipe wall thickness as per hydrotest pressure? because after installation, we need have a hydrotest for piping, the hydrotest pressure is 1.5xdesign pressure.