Mechanical Pack

mechanical seal for pump?

Why do some pumps need seal pot and nitrogen gas as blanketing

*Nitrogen is an inert gas,which do not react with puming fluid.
Reciprocating pumps are having pulsating flow and to minimise the pulsations there is a pulsation dampener in a suction and discharge line which uses nitrogen.
*Dampeners reduces wear and tear of the moving parts of a pump and 84 % power saning in head loss due to friction.
*Seal pots are chambers that capture water, thus preventing inaccurate measurement by a gas flowmeter.
*[Occupational health risks may derive from worker exposure to
hazardous chemical substances, including active ingredients
and pesticide dusts, during all production phases. Worker
exposure to solvent vapors may occur during manufacturing and
formulation processes, including operations for recovering or
isolating products; handling wet cakes in drying operations; wet
granulation; uncontained filtration equipment; equipment
cleaning; and fugitive emissions from leaking pumps, valves and
manifold stations (e.g. during extraction and purification steps).
In pesticides formulation and packaging processes, workers
may be exposed to airborne dusts during drying, milling and
mixing operations. Occupational hazards are associated with
exposure to mixtures containing high proportions of active
ingredients, and with exposure to carriers / fillers and additives.
These agents, although inert in terms of pesticide activity to the target pest, may be toxic and should be assessed for
occupational health impacts.
Recommended hazard prevention and control measures
include:
· Unloading of toxic raw materials and products with a gas
balancing system to minimize fugitive emissions and
prevent worker exposure;
· Gravity charging from enclosed containers, and enclosed
vacuum, pressure, and pumping systems during charging
and discharging operations to minimize fugitive emissions;
·Partitioning of workplace areas with dilution ventilation and
/ or differential air pressures. Where toxic materials are
processed, consider maintaining the plant under slight
overpressure (e.g. nitrogen blanketing);
· Installation of laminar ventilation hoods or isolation devices
where toxic materials are handled.
*[A mechanical seal, is a type of seal utilised in rotating equipment, such as pumps and compressors. When a pump operates, the liquid could leak out of the pump between the rotating shaft and the stationary pump casing. Since the shaft rotates, preventing this leakage can be difficult. Earlier pump models used mechanical packing to seal the shaft. Since WWII, mechanical seals have replaced packing in almost all applications.

A mechanical seal is an improvement on gland type sealing pumps.It is highly recommended when chemical/fluid handled is costly,hazardous,toxic and it is used to save marginal amount of power.In gland type pump there is always leakage through a gland housing(1 drop/sec) which goes to ETP which has treat it and hence load on ETP WHICH IS ALSO A LOSS of power.Basically there are two types of mechanical seal:balanced and unbalanced. Balanced seal are recommended in high pressure applications.
A mechanical seal is a device which helps join systems or mechanisms together by preventing leakage (e.g., in a plumbing system), containing pressure, or excluding contamination.
Please visit for detailed information:

http://www.mcnallyinstitute.com/02-html/...

(The function of a mechanical seal is to seal the opening where the shaft enters the pump, preventing fluid leakage.Originally mechanical seals were developed to overcome the negative issues affiliated with packed stuffing boxes. Simple mechanical seals offered an alternative to fluid leakage; none, least not detectable with the naked eye. They eliminated the need for a routine maintenance schedule as once properly selected and installed they would function without attention until the seal faces themselves wore out which could be years later, versus packing months. While initial cost to purchase a pump with a simple seal may have been higher their were no post installation costs and the return for this investment could be realized immediately with virtually zero product loss over the life of the seal.
(http://answers.yahoo.com/question/index?...

http://en.wikipedia.org/wiki/rotating_fa...]

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