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NE Indiana | Put the system in manual if your rate stops doing the big swings then its either a settings issue or there's something wrong with your control valve. If you put it into manual and the rate swings continue then your are getting vapor through the flowmeter.
When vapor goes through the flowmeter it spins that turbine quicker than liquid nh3, thus why you get the ultra high rate readings. Then the control valve closes down to compensate for the high rate and causes the rate to display low. The reason why vapor is coming through the system is either it is not cooling properly or we are out running the system.
I would assume you have a normal Accuflow which would have a capacity of 30 gpm of liquid anhydrous ammonia and Raven has a chart on their website comparing the temperature vs pressure on the gauge on the cooler on whether it is in a vapor or non vapor area. If we are not cooling properly that means we have a restriction somewhere. The first place I would look at is the strainer going into the cooler and make sure that it doesn't have a lot of rust blocking it up. Second place I would look is the 3/8" barb on the bottom side of the inlet of the cooler. That 3/8" line is the cooling line for the cooler so if that is blocked then it is not sending enough nh3 back to keep everything cooled down. I either blow air up into the barb (should hear the air come out of the vapor tubes) or use a field flag and stick up there to loosen up the blockage. If you still have problems check where our frost build up is on the system. Frost on the vapor lines and on the tee after the control valve are a normal thing but anywhere else usually points to where the blockage is occurring. I have also seen where the withdraw valve on a brand new tank was opened too quick setting off the excess flow check and caused it to starve the cooler or the check valve in the breakaway going bad and not letting enough nh3 go to the cooler. | |
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Ag Leader Incommand 1200 monitoring anhydrous ammonia application
