Originally Posted by WombatWhiskers
Thanks 10^9 for your diagnosis and advice. A couple of questions:
1. after a back flush, how many days do I have to complete reinstall at our NZ latitude before you get worried about the almost-new membrane?
2. radical change of subject: I can replace the Clark pump with a 230VAC driven CAT pump in less elapsed time, probably less $$, and get rid of all the maintenance
hassles. We don't benefit from the low energy performance of the Spectra energy-recovery design - because we only make water when genset is running -> pressurizing the wingdeck level feed pumps and boosting the VDC.
Given those facts why not switch to the simple/low-tech way to pressurize the membrane?
1) I wouldn't go more than two weeks and in my opinion that is pushing it. Pickling solution is cheap
enough to do it right.
2) A not so radical response. Unless you are well versed in watermakers I would doubt anytime saved is going to be worth it and I assure you it is going to be a lot more expensive. To convert a 380C to a Cat pump driven system is going to be a bit more complicated than just putting a Cat pump in line. First you will now need a proper boost pump that can keep up with a Cat pump, you will need a needle valve to adjust pressures, you will need a whole new set of high pressure lines and associated fittings, your plumbing
is going to need to be changed out which will require new hoses, fittings and valves. Unless you have a new and good free Cat pump hanging around the pump and motor
alone are going to cost you four times what a re-maned Clark pump will. The other additional parts
, plus some not mentioned above, are going to cost more than a Clark pump re-build. All this and more for about six gallons more per hour. The only good way to do this to end up with a Cat stlye driven watermaker
is to fix the Clark pump and make the system (Clark pump, membrane, feed pumps) operational, take it out and sell it. Spectras have the highest re-sale value of any watermaker
, even this older one. Take that money
and add the money
you will be spending on your proposed conversion and I'll sell you a brand new AMI 230V watermaker with a warranty.
So in short...well you know what to do.