Addressing this,I soldered on some brass stiffening trips as you can see here. I used 1" x 3/32" stock, purchased from a local hardware store. If you can find thicker (ala 1/8") it would work fine, but need to have it 1" wide.
Yesterday I bolted it back on, and it seems to be working well - at least the flanges no longer distort!
While I was at it, I also took the opportunity to re-route some of the plumbing as shown in this update diagram. The difference is we now run the sea water through the heat exchanger before sending it to the RO membranes. The reason for this is Revise Osmosis membranes are temperature sensitive. When they say 40GPH, it is when using a water temp of 77oF. Up here we see water in the 40's to the low 50's. It might get up to the mid 50's during the summer,but never to the 70-80o range. By pre-heating the water I am expecting to get more produced out of the membranes while still keeping them within their design specification. Once we get underway next month and start using the Water Maker again I will report on its performance.
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Update: See some more thoughts on this pre-heating idea here: