|Quoting dlramp4life (Thread starter):|
My question is if there is power from a GPU going into the aircraft, how the plane having power does prevent the water from freezing over in potable water tank?
Even a powered airplane makes a bit of heat. We tried this approach once. Once.
No, not really. The water lines are optionally heated; the tank is not.
Exactly; the ribbons heat the lines, not the tank. I'm not aware of any aircraft that has optional tank heat.
|Quoting bartonsayswhat (Reply 1):|
as not all of the water from the lines will come out and cracking in the lines could occur.
Not if it's designed properly. When rampers drain the potable tank, they're not getting the water out of the system, sure. But when we mechanics do it, we know to open the OTHER drain valve, which lets the remainder of the water gravity feed out of the system's lowest point.
|Quoting Tristarsteve (Reply 2):|
I see you live in Canada. Maybe your water tanks are heated. It is not normal.
I doubt it; here in Alaska, the 737 tanks aren't heated... just the lines.
After learning the hard way that forward lavatory lines are VERY HARD TO
THAW, we leave heat on the planes, and drain the water anyway! If someone (ramp) leaves L1 cocked while they are servicing the cabin, the door hinge covers aren't sealed shut, and blow icy air straight into the forward lav cavity that houses the water line! Took us ages to figure that one out.
All of this is why I eagerly await the arrival of May, when temps no longer warrant potable water worries!