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"Live and act within the limit of your knowledge and keep expanding it to the limit of your life." Ayn Rand, Atlas Shrugged.
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
We would lose more ultra-purified, de-inonized water through the main feed pump seal water glands per day than was used by 1/2 the crew taking showers for the shift.
Gland seal water is water pumped into a cavity beside the pump seal. The gland seal water both leaks out the seal and leaks into the fluid being pumped.
It's used for many reasons.
You'll find it on condensate pumps to prevent air from entering the condenser when the condensate pump is idle. (Typically the seal is under pressure when the pump is running).
On feed pumps, heater drain pumps, and rector coolant pumps it is used to prevent the water from flashing to steam once leaving the pump because the water being pumped is above 100°C. If the water were to flash in the seal, the seal would rapidly erode by the two phase flow.
In the case where the pump is handling radioactive water, it also keeps the radioactive water from escaping. At a PWR, the primary loop seal water comes from the reactor makeup and the condensate, and feed pumps comes from the output of the condensate pumps. I'm not familiar with BWR systems.
An organ seal is embodied a chamber which houses stationary fixing parts, for example, Lantern Rings, Neck Rings and Gland Packing. The chamber takes into consideration flushing water to be nourish into the fixing range through a food opening. Going through the focal point of the chamber is a pole which may have a conciliatory wear sleeve which turns against the stationary pressing in the fixing chamber or stuffing box. Weight is connected between the pressing and shaft sleeve through an organ adherent which when fixed packs the pressing, this structures a fixing line between the sleeve and the pressing, between the weight in the pump and climate outside the pump.
Actually this contact makes heat for which the motivation behind flushing water is to do what it says, flush and cool the fixing line between the stationary and pivoting parts. Inside of a slurry pump which can pump solids loaded item as well as acidic or soluble arrangements remittances should be made to lessen not just the impacts of grinding between the sleeve and pressing additionally consumption and disintegration.
