The constant emptying and refilling of mains -- in flat Karachi, all water must be pumped under pressure -- strains 40-year-old pipes and creates bacteria-attracting leaks.
The electrolyte, usually an aqueous salt solution, is pumped under pressure through the inter-electrode gap, thus flushing away metal dissolved from the workpiece.
Finally, Mr. Kornfeld said, boards that want to know the true condition of their fuel storage tanks can have them pressure-tested -- a procedure in which air is pumped under pressure into a sealed tank.
The adjacent desalination plant will use a reverse osmosis process with its source water coming from the generating plant cooling supply, treated and pumped under pressure through membranes to remove salt and other microscopic impurities.
In this method, two fluidized streams interact at high velocities and were pumped under pressure from a reservoir through the interaction chamber.
The powder mixture was dried by a water-jet pump under the pressure of 10 kPa at 90°C for 120 min. After drying, the catalyst powder was ground in an agate mortar.
One benefit of pumping water under pressure was that a system could be built that followed the contours of the land; the earlier free-flowing systems had to maintain certain gradients over varied terrain.
"I was proud of the way the lads handled the second half because we were under the pump, we were under pressure," O'Mahony said.
Through these risers, a highly viscous concrete mixture is pumped under high pressure into the waiting forms above.
Underground injection wells (into which liquid waste is pumped under high pressure) must deposit the liquid in a permeable layer of rock that is sandwiched between impervious layers of rock or clay.
The process industries never stay still for very long, and keeping up with the demands of a market that has to handle ever increasing temperatures and more aggressive substances pumped under higher pressure is far from easy.
