How can I convert ft per sec to GPM?

Question

How can I convert ft per sec to GPM?

Answer 1

Unless GPM is a measure of speed, you're missing a variable or two.

Answer 2

ft per sec is a unit of velocity,say linear.

GPM is a unit of volume flow rate.

So, you can not convert ft per sec to GPM.

You can use the relationship between two , if you are missing something:

Volume flow rate[m^3/sec]

=Area[m^2/sec]*Velocity[m/sec]

Use the same/consistant system of unit.

Here,is a good unit conversion link:

www.onlineconversion.com

Answer 3

Assuming feet is not linear (ft^1), but cubic (ft^3), and G stands for gallon, not gram, and M stands for minute, not month:

U.S. liquid gallon is legally defined as 231 cubic inches

So multiply cubic feet by (inches per foot = 12)^3 = 1728 cubic inches, and divide by 231 to get gallons per second.

Next, multiply gallons per second by (60 seconds per minute) to get gallons per minute.

Answer 4

Through or over what?  Through a pipe or over a wier?  One is an area calculation (through a pipe of given diameter) the other is a head calculation so you need to know the geometry (v-notch, square notch, etc) dimensions of the obstruction.  There are also calculations using the arc and distance water or a fluid going through a nozzle from a hose to atmosphere, similar to a calculation firemen must use for their pumper calculations.  As said earlier, you can't directly convert a velocity measurement to a volumetric measurement  without knowing other variables.

Answer 5

yes your units are inconsistent.  You would need your pipe diameter to know how much you are liquid you are flowing.  Go from there and you should be able to figure it out.

(you will use the cross sectional area of the pipe)

Edit:

1)  Change you Gallons to cubic feet (7.43 is the conversion factor)

20 GPM / 7.43 = 2.67 FT^3 / min

2)  Divide out by the Cross sectional Area or the pipe/tube you are flowing through

Say your Pipe has I.D. of 1 inch: pi*r^2  <radius in feet

A = 3.14 * (.5/12)^2 =  0.00545 ft^2

2.67 Ft^3/min

___________      = 490 ft/min   (notice my units canceling out)

0.00545 ft^2

3) Change your ft/min to ft/sec

490 ft/min

_______       = 8.16 ft/sec  

60 sec/min

Answer 6

Cubic feet per second.. Yes, feet per second ..No.

Answer 7

you can't, the units are inconsistent.

Ft/sec is a linear speed or velocity.

Gallons per minute is a volume flow rate.

Answer 8

you can't.

ft/sec is distance divided by time

gal/min is volume divided by time

distance can't be converted to volume

Answer 9

You can't, unless you have an o*****e area, or

pipe diameter.

GPM is volume over time.

Ft per second is distance over time.

You need to convert that distance to a volume

with the area of the flow.

Get It?