RO Feed Piping Material Selection
RO Feed Piping Material Selection
(OP)
I am involved in design of an RO drinking water plant and was curious if there are thoughts on piping material upstream of the RO system. We do not want to use PVC because greensand filtration is planned as pre-treatment, and there may be pressure surges associated with valves slamming shut during backwash. Carbon steel was initially selected, but some folks have concerns that corrosion may introduce iron into the water upstream of the RO (the greensand filter removes iron/manganese to protect the RO, ideally want less than 0.05 mg/L iron), and cause scaling issues. Does anyone have thoughts on acceptable piping material for this application? Carbon steel and cement-lined ductile iron pipe are being tossed around now.





RE: RO Feed Piping Material Selection
RE: RO Feed Piping Material Selection
RE: RO Feed Piping Material Selection
FRP is probably the best choice.
RE: RO Feed Piping Material Selection
RE: RO Feed Piping Material Selection
The FRP piping should be somewhat equivalent in strength and design aspects to steel piping.
RO Membranes are too expensive to rely on cartridge filters for protection. You should have clean water after the greensand filters, why would you want to add contamination from corrosion products?
Pneumatic actuators should come with air solenoids that allow the valve closing times to be adjusted.
RE: RO Feed Piping Material Selection
RE: RO Feed Piping Material Selection
RE: RO Feed Piping Material Selection
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RE: RO Feed Piping Material Selection
RE: RO Feed Piping Material Selection
Regards
Niss'