Dean Smart
New Member
System:
16x65" tank
3.75 CF Dowex HCR S/S, nominal 120,o00 grain
75 PSI regulated
10 grain average hardness, no iron
Supplied trim: #1 white injector, BLFC=0.25, DLFC=7.0
Target regeneration is:
-8 pb/CF NaCl.
-10 gallons brine fill/draw
-27,000 grains per CF regen capacity at 8 lbs NaCl/CF
-101,000 grains cycle capacity
The system is deliberately over sized!
Dowex minimum regen flow rate is .56 gpm for a 16" diameter bed. (0.4 - 4.0 gpm/ft*2)
White injector brine draw rate is .36 gpm. But total injector flow is 1.2 gallons per minute.
Fleck specified #1 white injector for 16", that is was distributor supplied.
BD time for #1 injector is long. DB should not change with bed capacity, only flow rates need to change. Brine draw time is 10 gal /.36 gal/min = 28 minutes. Adding a slow rinse of 60 minutes leads to a BD of 90 minutes if slow rinse is ~twice brine draw time. Dowex suggests a rinse of 3-6 bed volumes. At 3 bed volumes we have 3 *3.75 CF * 7.48 gal/CF = 84 gallons. At .84 gpm rinse the slow rinse is 84/.84 = 100 minutes for a BF=128 minutes. But B2 and RR also clear the salt.
I think that I should be using #3 yellow for [at 75PSI] brine draw rate of 0.6 gpm, 1.4 gpm rinse, total flow 2.0 gpm and BLFC=0.5; noting that BLFC flow rates must be below injector flow rates to get accurate programmed brine fill results as water flows through the injector and then BLFC.
When Fleck states in Bulletin 599 May 2008: "The treated water runs through the injector before the BLFC, therefore the BLFC must be sized smaller than the injector flow rates to be accurate in determining how much treated water is being placed in the brine tank." If they are referring to "Draw" rates, then BLFC=0.5 is to0 close Draw=0.6 and then BLFC=0.25 might be better.
--I don't know what injector flow rate they are taking about. Looking at the flow charts, is this flow "Total", "Draw" or "Rinse" when filling the brine tank? During brine draw, the drain line is open and water flows through the injector. During brine fill, the system is in service and drain line is closed and water flows through only the top half of the injector then to the BLFC. This injector flow rate is not clearly documented. In any case, a larger flow rate injector provides more BLFC safety factor VS the undefined flow rate in bulletin 599.
BTW, the diagram in Bulletin 599 is not correct. The diagram shows brine draw, not brine fill!
Is what I am suggesting OK? [I have not been able to find any sizing info dated later than 2008.]
Thanks!
16x65" tank
3.75 CF Dowex HCR S/S, nominal 120,o00 grain
75 PSI regulated
10 grain average hardness, no iron
Supplied trim: #1 white injector, BLFC=0.25, DLFC=7.0
Target regeneration is:
-8 pb/CF NaCl.
-10 gallons brine fill/draw
-27,000 grains per CF regen capacity at 8 lbs NaCl/CF
-101,000 grains cycle capacity
The system is deliberately over sized!
Dowex minimum regen flow rate is .56 gpm for a 16" diameter bed. (0.4 - 4.0 gpm/ft*2)
White injector brine draw rate is .36 gpm. But total injector flow is 1.2 gallons per minute.
Fleck specified #1 white injector for 16", that is was distributor supplied.
BD time for #1 injector is long. DB should not change with bed capacity, only flow rates need to change. Brine draw time is 10 gal /.36 gal/min = 28 minutes. Adding a slow rinse of 60 minutes leads to a BD of 90 minutes if slow rinse is ~twice brine draw time. Dowex suggests a rinse of 3-6 bed volumes. At 3 bed volumes we have 3 *3.75 CF * 7.48 gal/CF = 84 gallons. At .84 gpm rinse the slow rinse is 84/.84 = 100 minutes for a BF=128 minutes. But B2 and RR also clear the salt.
I think that I should be using #3 yellow for [at 75PSI] brine draw rate of 0.6 gpm, 1.4 gpm rinse, total flow 2.0 gpm and BLFC=0.5; noting that BLFC flow rates must be below injector flow rates to get accurate programmed brine fill results as water flows through the injector and then BLFC.
When Fleck states in Bulletin 599 May 2008: "The treated water runs through the injector before the BLFC, therefore the BLFC must be sized smaller than the injector flow rates to be accurate in determining how much treated water is being placed in the brine tank." If they are referring to "Draw" rates, then BLFC=0.5 is to0 close Draw=0.6 and then BLFC=0.25 might be better.
--I don't know what injector flow rate they are taking about. Looking at the flow charts, is this flow "Total", "Draw" or "Rinse" when filling the brine tank? During brine draw, the drain line is open and water flows through the injector. During brine fill, the system is in service and drain line is closed and water flows through only the top half of the injector then to the BLFC. This injector flow rate is not clearly documented. In any case, a larger flow rate injector provides more BLFC safety factor VS the undefined flow rate in bulletin 599.
BTW, the diagram in Bulletin 599 is not correct. The diagram shows brine draw, not brine fill!
Is what I am suggesting OK? [I have not been able to find any sizing info dated later than 2008.]
Thanks!