Here a pump is operating close to the vapor pressure of the fluid being pumped.

In this way, the water always gains heat from the collector when the pump operates.

That way, if the primary pump does not operate, the secondary will automatically start when the water rises higher than normal.

It was the first time in 36 years, said an Iraqi supervisor, that the pumps had operated at full capacity.

This pump will operate well so long as all other parameters are correct.

These pumps operate during periods of low power demand, filling the reservoir.

Conventional pumps operate on household electricity and will not run in a power failure.

A pump for an oxygen line on the ground operated erratically, as it had before.

The circulating pump that supplies water pressure - it is usually near the furnace - should be operating as well.

The lower pool must, of course, be large enough to contain sufficient water to maintain a good depth when the pump is operating.