Gallons per minute

Barrels per day Gallons per minute 0.02917 Centimeters of mercury at 0 C. Pounds per square foot 27.845... 

B.t.u. per pound per degree Joules per Idlogram per degree 4186.8 Cubic feet per second Gallons per minute 448.8... 

FIG. 10-26 Pump coverage chart based on normal ranges of operation of commercially available types. Solid lines use left ordinate, bead scale. Broken lines use right ordinate, pressure scale. To conveii gallons per minute to cubic meters per hour, multiply by 0.2271 to conveii feet to meters, multiply by 0.3048 and to conveii poiinds-force per square inch to Idlopascals, multiply by 6.895. 

FIG. 10-28 Characteristic curve of a centrifugal pump operating at a constant speed of. 3450 r/min. To convert gallons per minute to cubic meters per hour, multiply hy 0.2271 to convert feet to meters, multiply hy 0..3048 to convert horsepower to kilowatts, multiply hy 0.746 and to convert inches to centimeters, multiply hy 2.54. 

Bolles, chap. 14 in Smith, Design of Equilihiium Stage Processes, McGraw-Hill, New York, 1963. To convert feet to meters, multiply hy 0.3048 to convert gallons per minute to decimeters per second (hters per second), multiply hy 0.06309 and to convert gallons per minute to ciihic meters per second, multiply hy 6.309 X 10" ... 

FIG. 14-33 Cor rection for effective weir length. To convert gallons per minute to ciiLic meters per second, multiply by 6.309 X 10 to convert feet to meters, multiply by 0.3048. [Bolles, Pet. Refiner, 25, 613 (1946).]... 

FIG. 14-54 Pressure drop for Flexipac packing, sizes No, 1 and No.. 3, Air-water system at atmospheric pressure. Liquid rate in gallons per minute-square foot. To convert (feet per second) (younds per cubic foot) " to (meters per second) (kilograms per cubic meter) " , multiply by 1,2199 to convert gallons per minute-square foot to pounds per hour-square foot, multiply by 500 to convert inches of water per foot to millimeters of water per meter, multiply by 83,31 and to convert pounds per hour-square foot to kilograms per second-square meter, multiply by 0,001.356, Coutiesy Koch Engineering Co., Wichita, Kansas.)... 

To convert gallons per minute-square foot to ciihic meters per hour-square meter, multiply hy 2.44. 

Goiu tc.s Baker Perkins Itic. To convert inches to aaitiineters, nmltiph l) 2.,54 to convert pounds to kilograms, inultiph l) 0.4,54 to convert horsepower to kike watts, nmltiph l) 0.746 mid to convert gallons per minute to cul)ic meters per hour, multiph l) 0.227. 

NOTE To convert inches to milhmeters, multiply by 25.4 to convert revolutions per minute to radians per second, multiply by 0.105 to convert gallons per minute to hters per second, multiply by 0.063 to convert tons per hour to kilograms per second, multiply by 0.253 and to convert horsepower to kilowatts, multiply by 0.746. 

FIG. 29-60 Excess head developed by lean and semilean pumps and the steam-throttle flow for a semdean-pump turbine. To convert gallons per minute to cubic meters per minute, multiply by 0.00379 to convert pounds per hour to kilograms per second, multiply by 1.260 X 10 . ... 

US GPM = diseharge in US gallons per minute 1 GPM (UK) = diseharge in imperial gallons per mintite Hf = head (in feet)... 

Table A.3 Table of conversions of gallons per minute into litres per second ...

I need a pump to raise cold water at 10 gallons per minute. There is an open well with water 40 ft below ground level. 

Flow = (iapacity = Q Lit]uid volume measured in gallons per minute (gpm) or liters per minute, cubic meters per hour, or some other rate. 

Where H = head in feet generated by the pump Q = flow recorded in gallons per minute sp. gr. = specific gravity 3960 = constant to convert BHp into gallons per minute... 

Flow is the number of gallons per minute that the pump will discharge. 

It is not practical to declare the flow without the accompanying head requirements. For this reason, when someone asks for the pump specifications, they need to know the flow in gallons per minute and the head in feet. 

Remember that pumps don t actually generate flow (no pump in the world can convert three gallons per minute at the suction nozzle into four gallons per minute out of the discharge nozzle), but this is the term used in the industry. 

Wliere N = the speed of the pump/motor in revolutions per minute Q = the square root of the flow in gallons per minute at the Best Efficiency Point BEP. For double suction pumps, use A BEP Flow. NPSHr = the net positive suction head required by the pump at the BFiP. 

Another distinction in impellers is the way the liquid traverses and leaves the impeller blades. This is called the Specific Speed, Ns. It is another index used by pump designers to describe the geometry of the impeller and to classify impellers according to their clesign type and application. By definition, the Specific Speed, Ns is the revolutions per minute (rpm) at which a geometrically similar impeller would run if it were of such a size as to discharge one gallon per minute at one foot of head. 

In those days, there were no oil refineries, nor bottlers of carbonated soda, nor sulfuric acid plants. There was only one liquid to consider, and move in large quantities. .. fresh water from the mountains. With only one liquid under consideration, fresh water, and no. sophisticated instrumentation, they measured the water s force, or pressure, in terms of elevation. It is for this reason that today all over the world, pump manufacturers u.se the term Head measured in meters or feet of elevation to express pre.ssure or force. The term flow expresses volume over time, such as gallons per minute, or cubic meters per second. 

The matrix of the pump curve graph is the same as the mathematical x-y graph. On the horizontal line, the flow is shown normally in gallons per minute or cubic meters per second. The vertical line shows the head in feet or meters. See Figure 7-1. 

At point A on the H-Q curve, the pump is pumping Q gpm (gallons per minute), at H feet of head. This point on the curve corresponds to the best efficiency, and it is also seen at approximately the middle of the energ) curve, and al.so on the NPSHr curve where it begins its sharp rise. 

This system requires a pump with a best effieieney point (BFP) of 94 feet at 300 gallons per minute. If this is a eonventional industrial centrifugal pump with a BFiP of 94 feet, the shut-off head should be approximately 110 feet. And if the motor is a standard NFMA four pole motor spinning at about 1800 rpm, the diameter of the impeller should be approximately 10.5 inehes. If this pump were bought off the shelf from local distributor stock, it would probably be a 3 x 4 x 12 model end-suction centrifugal back pullout pump with the impeller machined to about 10.5 inches before installing the pump into the. system. And that s the way it is done. 

Using and GPM (column liquid loading in gallons per minute), obtain approximate tower diameter for calculating flow path length. Use... 

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