TankVolume, as it appears in the online store, calculates the liquid volume of partially filled tanks, horizontal or vertical, with various types of heads.  One of these, the torispherical head, requires that integral equations be solved.  This article shows how the integrals are evaluated.

Experience is typically what turns a good engineer into a great engineer. An engineer that can look at a pipe and a flowmeter and guess the pressure drop within 5%. Someone who can at least estimate the size of a vessel without doing any calculations.

Often times it is necessary to find the heat capacity for solutions with dissolved solids. A quick estimation method was proposed by Dimoplon in 1972.

Dilution calculations are easy when you're in the middle of your chemistry class in college.   However, if you haven't done one in quite some time, it's easy to make mistakes.

Thermal conductivity values are available for a wide range of industrial fluids in literature. Still, there may be times when your search yieldslittle or no results. With the methods discussed here, you can estimate the thermal conductivity of any organic compound via group contribution methods.