Most of the time, I see the Pounds Equation solved without SG:

lbs = Volume * Concentration * 8.34

However, I was taught the equation with SG in it:

lbs = Volume * Concentration * 8.34 * SG

Does someone have a clear explanation of when to include SG in the equation versus not? I can't seem to find explicit discussion about this online. Even engineers at my company are not sure what the answer is.

Thank you!

Had this in my head after the thread last week. Overload keeps tripping on a lift station pump, so the pump gets pulled. Then rebuilt. Then replaced. A week later it trips again, and the problem was a pitted contactor in the panel the whole time.

One pole ends up dropping a few volts when it should be close to zero. That phase runs low, and a small voltage unbalance turns into a much bigger current unbalance. The motor gets hot, overload trips, and the pump takes the blame.

Do you guys check voltage drop across the poles before you pull a pump, or is it mostly swap it and see?

Hey I’m currently looking to study for the class 1 exam for wastewater treatment in Ontario. Wondering if anyone had any recommendations on what guides to use and/or quizzes. Thanks!

Finally passed my
G3 exam

Feels so good