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Thank you mjcronin, that is helpful. I was hoping for a supplier of duplex pipe chart showing max pressures for a given wall thickness and then we can subtract the 1.6mm groove depth to confirm. It seems like duplex 2205 is significantly stronger than 316 and most charts I can find are for 316

Thank you

Thanks Ed, yeah I'm finding same! Any seawater RO is typically high pressure and duplex 2205 seems to be more common now too so sure there must be companies out there doing this tyope of application just hard to find them! Do you know if there are any pipe charts available showing max operating...

thanks LittleInch please see the coupling datasheet https://res.cloudinary.com/engineering-com/image/upload/v1682848400/tips/LQueen_Grooved_Couplings_Sizes_Pipe_Specs_Sonac_RO_lxpd0u.pdf

The grooves hold the victualic coupling on the pipe. It's a smart design and very common for reverse osmosis prrssure vessels and pipework. Victaulic website has many downloads showing groove details. The groove is typically about 8mm wide and 1.6mm deep

Yeah ok thanks. Trying to research roll grooving instead of cutting...do you know if the rolled grooved section could be weakened because the duplex is harder.....(if we can find a grooving machine to do the 40S pipe)

thank you EdStainless, yes, have done this - the 83bar LQueen coupling datasheet mentions the groove depth to be 1.6mm for both 2" and 2.5" pipe. they also show min wall thickness of 3.9mm for the 2" pipe and min WT of 4.78mm for the 2.5" pipe. But its not clear to me if they are calling for a...

Building an industrial RO to operate up to 80bar pressure with duplex 2205 s.s pipe. The RO pressure vessels have groove coupling port connectors. I understand no fabricators can roll groove sch40 duplex pipe with std hydraulic roll groove machines as the duplex 2205 is too hard. Cutting the...