Formulas, Symbols, and Terminology

For the convenience of plumbing engineers, following are some of the basic formulas commonly referred to and
utilized in plumbing engineering and design. It is extremely important to convert values to the proper units
whenever using these equations.
Take note that gravitational acceleration and gravitational constant have the same numerical value, but the
units are not the same. These terms can be left out of equations with no effect on the numerical value. However,
the units will not be dimensionally correct and do not cancel out.
Due to the English system of measurement utilizing pounds to indicate mass and force, pounds-mass (lbm)
and pounds-force (lbf) are used to distinguish between the two. This is not an issue for the International System
of Units (SI)

Parts of the American Society of Plumbing Engineers standard
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