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@HTURKAK, as you mentioned, for the circular duct dimension, which standard should I use? thanks!

@HTURKAK, thank you very much, now I am reading ASCE The Structural Design of Air and Gas Ducts for Power Stations and Industrial Boiler Applications, it is very helpful for my work.

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!

@mk3223 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, I cannot find EN spiral wound gasket standard, but I found DIN 2699, it is spiral wound gasket standard, it can be used in PN250.THANKS!

@littleinch thanks, I will ask klinger.

@XL83NL:but EN 1514 only up to PN100, my flange is PN250, I want to use spiral wound gasket. thanks! @littleinch: 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!

@robyengIT I have found some manual at PPI, and I also found some manual at PPFA(plastic pipe and fitting association). thanks for you prompting. @mk3223 these plastic pipes are used in waste water treatment plant, used as chemical dosing pipes, above ground. Thanks for your reply. @littleinch...

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

Hi, GT-EGR, willard3，thanks for you reply, I will check the SMACNA duct construction manual

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

thank you Mk3223

Hi, Pennpiper, the valve size is DN500.

firstly thank you for mk3223 & Littleinch, the vendor suggested special flange see below, the small end connect to valve, the large end connect to pipe.

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?

thanks for Littleinch and Moltenmetal

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.