Why does the water tower (next to the house) have a tent during the day in thirty-degree heat, but not at night? That’s what I thought too. It turns out – I thought wrong.
It turns out that the tent is temporary, necessary for painting the tower. Once painted, it will be removed. At night, the paint is aired out and dries.
By the way, the tower is metallic, which means it changes size with temperature fluctuations. Hence, the paint is elastic.
Interestingly, how they check if everything has been covered with paint (because otherwise it will start rusting). They use a method, amusingly still called Holiday Detection since the early days of shipbuilding, which is essentially spark testing for defects.
A specialist takes a device that looks like a mop with a metal brush, to which a high voltage is applied (up to several thousand volts). Since dry epoxy resin is a dielectric and the steel wall behind it is a conductor, the inspector slowly moves the brush over the freshly painted wall. If there is even the slightest microscopic defect in the coating, the electrical circuit is completed, a loud beep sounds and a spark jumps. This spot is immediately marked and repainted.
Also, by the way, just in case someone didn’t know, these towers don’t even come close to creating enough pressure for the water to reach your faucet. They act as accumulators, softening the uneven consumption. And at the same time, they serve as a shock absorber.
And another interesting fact is that in the northern states the problem is not with heating but with freezing in the winter. A layer of ice forms on the surface and along the walls, comparable to a meter or two in thickness. And there, they really do have water heaters.
Hi, I'm Rauf Aliev. 