Hydraulic Information and Data A to Z Logo

Hydraulic Information and Data

To reduce pounds pressure to feet head, multiply by 2.31.
To reduce heads in feet to pressure in pounds, multiply by .433.
Friction of liquids in pipes increases as the square of the velocity.
Doubling the diameter of a pipe increases its capacity four times.
To find the area of a pipe, square the diameter and multiply by .7854.
A cubic foot of water weighs 62.5 pounds and contains 1728 cubic inches or 7.5 US gallons.
Approximately every foot elevation of a column of water produces a pressure of .5 pound per square inch.
A "miner's inch" of water is approximately equal to a supply of 11.2 gallons per minute.
The gallons per minute which a pipe will deliver equals .0408 times the square of the diameter, multiplied by the velocity in feet per minute.
To find the volume of a cylinder in gallons, multiply the square of the diameter in inches by the length in inches and by .0034.
The weight of water in any length pipe is obtained by multiplying the length in feet by the square of the diameter in inches, and by .34.
To find the discharge from any pipe in cubic feet per minute, square the diameter in inches and multiply by the velocity in feet per minute and by .00545.
One US gallon of water weighs 8.33 pounds and contains 231 cubic inches. An imperial gallon weighs 10 pounds and contains 277 cubic inches.
To find the diameter of pipe in inches, divide the gallons per minute, and multiply the square root of the quotient by 4.95.