Roof Drain Calculations
In order to size rain water leaders and gutters there are some simple calculations to follow. First, you must know the maximum 15 minute rainfall …
Plumbing Math
Rolling Offset Formula
Applying the Rolling Offset Formula: A rolling offset in a plumbing system is when a pipe changes in both the horizontal and vertical planes. The …
Plumbing Math Formulas
Math unfortunately is part of being a plumber or any other skilled trade for that matter. Although we don’t tend to use many of these …
Pipe Expansion Formula
Finding the expansion of pipe is relatively easy using the formula for “linear expansion”. There are many reasons beside trade school to know these calculations …
Specific Gravity Formula
The specific gravity of a substance is a comparison between the mass or density of a substance as compared to an equal volume of water. …
Ratio of Pipe Capacity Formula
An important plumbing concept is understanding the ratio between pipe size and volume output. A common question that can be found on plumbing exams is: …
How To Convert Decimals To Fractions
Often when reading plans, surveys or calculating measurements we are left with decimal numbers and need to convert them to feet, inches and fractions of …
Area Formulas for various objects
Area of a square / rectangle Area = length x width Area of a circle Area = diameter x diameter x .7854 Surface area of …
Finding The Volume Of Objects
Finding the volume / capacities of various objects is generally quite simple, just follow these formulas. Rectangular tanks Cylindrical tanks Elliptical tanks Spheres Frustum shaped …
Finding Grade Using A Philadelphia Rod
Using Survey Equipment To Find Pipe Grade Although most residential plumbers will only need to know how to read a Philadelphia rod in order to …
