Railway Pipe Fitter's Handbook

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Simmons-Boardman, 1925 - 213 páginas
 

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Página 194 - To find the pressure in pounds per square inch of a column of water, multiply the height of the column in feet by .434. Approximately, we say that every foot elevation is equal to % Ib. pressure per square inch ; this allows for ordinary friction. To find the diameter of a pump cylinder...
Página 194 - The square of the hypothenuse is equal to the sum of the squares of the other two sides ; as, 5033 402+302.
Página 123 - Divide the difference in temperature, between that at which the room is to be kept and the coldest outside atmosphere, by the difference between the temperature of the steam pipes and that at which you wish to keep the room, and the product will be the square feet, or fraction thereof of plate or pipe surface to each square foot of glass (or its equivalent in wall surface).
Página 195 - The evaporation of 30 pounds of water per hour from a feed water temperature of 100° F.
Página 206 - ... the given size, and multiply its capacity by 4; or one of one-third its size, and multiply its capacity by 9, etc.
Página 194 - A cubic foot of water contains "]\ gallons, 1728 cubic inches, and weighs 62| pounds. To find the pressure in pounds per square inch of a column of water multiply the height of the column in feet by .434.
Página 194 - To find diameter of a circle multiply circumference by .31831. To find circumference of a circle multiply diameter by 3.1416. To find area of a circle multiply square of diameter by .7854. To find surface of a ball multiply square of diameter by 3.1416. To find side of an equal square multiply diameter by .8862.
Página 194 - ... diameter by .5236. Doubling the diameter of a pipe increases its capacity four times.
Página 111 - It will be seen by a study of the table, that the quantity of vapor, per cubic foot of air, increases very rapidly as the temperature advances — a common difference of about 25 degrees in the rise in temperature of the air, doubling the quantity of moisture it is able...

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