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Volumetric Flux

gfdtoin/min

Convert US gallons per square foot per day (gfd) to inches per minute (volumetric flux) (in/min).

Factor1 gfd = 0.001113976 in/min

Converter

gfd

Accepts numbers or expressions, e.g. 150 + 14.7

Result
1.11398in/min

Rendered to 6 significant figures.

Formula

Formula
in/min = gfd × 0.001113976

Multiply any value in US gallons per square foot per day by 0.001113976 to obtain the value in inches per minute (volumetric flux).

Worked example

Convert 1000 gfd to in/min.

  1. 01Start with 1000 gfd.
  2. 02Multiply by the conversion factor: 1000 × 0.001113976 = 1.11398 in/min.
Result1000 gfd = 1.11398 in/min

Conversion table

gfdin/min
10.001114
20.002228
50.0055699
100.01114
200.02228
500.055699
1000.1114
2000.2228
5000.55699
10001.114

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from gfd to in/min?
1 gfd equals 0.001113976 in/min. To convert, multiply the value in US gallons per square foot per day by 0.001113976.
How do I convert 1 gfd to in/min?
1 gfd = 0.00111398 in/min. For any value, multiply by 0.001113976.
How do I convert in/min back to gfd?
Divide by the same factor — or equivalently, multiply by 897.6851. So 1 in/min = 897.685 gfd.
When would I need to convert US gallon per square foot per day to inch per minute (volumetric flux)?
Volumetric-flux conversions between gfd and in/min are routine in membrane filtration (RO, UF, MF, NF permeate flux), hydraulic loading specification, water-treatment design, hydrometallurgy and packed-bed column loading, and environmental engineering. LMH (L/m²/h) and gfd (gal/ft²/day) dominate membrane datasheets; m³/m²/h and m³/m²/day cover SI engineering ladders; m/day and cm/s appear as superficial velocity in hydromet and packed-bed work. Volumetric flux is the same physical quantity as superficial velocity (m³/m²/s ≡ m/s) but is kept distinct from the velocity and flow categories because the engineering intent is volumetric throughput per unit area, not bulk motion or total throughput.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).

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