Closed Loop Slug Dose Volume
Also known as slug dose · one-shot dose
Enter your known values, leave one input blank, and solves for the missing one. Try different units for next level excitement!
Learning zone
Closed loops are not fed continuously — they get slugged. You want a target ppm in the loop, you know roughly how many gallons the loop holds, and the drum in your hand is a liquid whose label gives a density in pounds per gallon. Convert the required mass of product to a volume you can actually pour: 200 ppm into 1000 gallons needs 200 × 0.001 × 8.34 = 1.67 lb of product, and at 9.5 lb/gal that is 0.176 gal — about 22.5 fluid ounces. Measure it in a graduated pitcher, not by eye.
Chemical density is the part people skip. Nitrite and molybdate inhibitors commonly run 9.5–10.5 lb/gal, glycol-based products near 8.6, and concentrated caustic 12.7 — assuming water density can put you 25% off. Field practice: pour the slug into a bypass feeder (a pot feeder), open the isolation valves, and give the loop at least three full turnovers before you test. Testing ten minutes after dosing produces a beautifully wrong result and a second unnecessary slug on top of it.
- = Product volume to add
- = System volume
- = Target concentration
- = Product density
- Product volume to add — Density, Molarity (C = n/V)
- System volume — Dose Achieved from Chemical Added, Holding Time Index
- Target concentration — Glycol Dilution, BOD Mass Loading
- Product density — Density, Specific Gravity