That's important because PEX fittings suck at pressure drops in comparison to copper and pvc. The entire point of PEX is that it should be ran in a way to eliminate the need for most elbow and other fittings in comparison to typical PVC or copper runs. PVC 3/4" elbows are equivalent to 2.1 feet of straight pipe which means a loss of. Uponor Propex plastic elbows which are decent compared to other plastic elbows have an equivalent straight pipe length of 10.8 ft which means a loss of 2.17 psi to go thru a 3/4" elbow at 10 gpm. The loses increase substantially at higher flow rates like running a garden hose. 3/4" Pex has a pressure drop of 21.78 psi per 100 feet of pipe at 10 gpm where 3/4" PVC has a pressure drop of 8.7 psi and 3/4" copper type M has a drop of 8.9 psi. Moving into longer runs like in a shop or warehouse, the higher losses in PEX vs PVC and copper can add up. But these days, you never know, so I thought I would mention it to OP. Residential should be easy since runs are short and it would be kind of hard to screw it up. They would understand things like pressure drop vs flow rate in straight pipe and the equivalent length of straight pipe of a fitting. View QuotePeople who design fire protection systems can read and would have understood what I wrote. However, there are lots of hacks out there that believe the best answers are the ones they pull out of their asses rather than from easily accessible and documented handbooks. It shouldn't be hard to use the information in handbooks for proper sizing. There are handbooks from PEX manufacturers that give guidance on sizing. So PEX systems need to be designed with care to avoid excessive friction losses. PEX systems are tubing with a smaller flow area compared to the same nominal sized copper, galvanized and PVC.Īlso, pex fittings are very restrictive because the fittings fit the inside but f the tubing instead of the OD. Traditional plumbing such as copper, galvanized, and PVC piping have fittings which fit the OD of the pipe so as not to restrict flow. If you have a pressure gauge immediately on the house side of the regulator, you can troubleshoot by opening various faucets and watching the pressure drop.Īnother hack that occurs due to using fake plumbers, is improperly sized plumbing. If the regulator is undersized because some hack chose it, then the flow rate across it will be very low. The regulator needs to be sized properly to allow sufficient flow at that pressure. 50 psi is plenty of pressure for adequate flow rates for properly sized piping in residential plumbing.
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