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Water waste is often deemed an unwanted, however inevitable by-product of mining processes. Yet ราคาเกจวัดแรงดันลม sealing technology exists which may virtually eliminate this waste while conserving power, enhancing pump reliability and attaining long run operational financial savings.
Water is amongst the most vital, and more and more imperilled, sources on earth. That a lot is known and acknowledged by industries across the globe.
However, additionally it is one of the most unnecessarily squandered resources in mining operations. And whereas the trade has begun to embrace effectivity and sustainability-led advances such as automation and renewable power, it remains steadfastly set in its ways in phrases of slurry pump know-how.
Three approaches are routinely specified by pump producers to seal slurry pumps: mechanical packing, expellers (also often identified as ‘dynamic’ seals’) and single mechanical seals. All include significant limitations, together with poor reliability, decreased mean occasions between failure (MTBF), intensive upkeep requirements and higher operational prices.
These components alone ought to give mine managers trigger for a re-evaluation of the sealing strategies used on slurry pumps. However, any company with a commitment to the International Standards Organisation ISO-14001 Standard for environmental administration systems and ISO-50001 Standard for energy management systems should pay consideration to the excessive water waste and excessive energy consumption that outcomes from choosing these conventional sealing strategies.
Inefficient sealing When used to seal the method pumps in a mine’s scrubber and floatation circuits, gland packing, single mechanical seals and expeller seals all demand some of the wasteful features of slurry processing which is seal flush water injection.
On gland packed pumps it’s important that packing is flushed with clean water to keep it cool and lubricated, while both single slurry seals and expellers require a supply of cool, clear flush water to be injected into the method at excessive strain, maintaining a stable fluid movie between the delicate seal faces to keep them cool and lubricated, while forcing the damaging slurry away.
The flush water required in all three sealing approaches is provided from an external supply and injected into the process at a higher stress than the stuffing field stress, according to the industry standard American Petroleum Institute (API) Piping Plan 32. Water which doesn’t leak onto the ground or into the process is sent to the tailings dam. This additionally has an impact on the water balance of the plant.
This strategy constitutes a loss of clean water amounting to billions of gallons a 12 months globally. One giant, typical slurry pump sometimes consumes 10 US gallons (37.8 litres) per minute, amounting to 5.2 million US gallons (19.6 million litres) of water yearly – a shocking statistic by any measure.
At a time when global water provide is predicted to fall in need of demand by some 40% by 20301 , removing pointless use of this valuable useful resource should arguably be a central plank of any accountable sustainability programme. Yet excessive water use, and the higher energy consumption it entails, stay embedded in the processes of many mining corporations. Worse nonetheless, it is truthful to say that it is usually accepted as merely ‘par for the course’ by reliability engineers and management alike.
But the very fact is that water waste on any scale is a totally pointless function of slurry operations as it can be almost completely eliminated just by using superior double mechanical seals and modern water administration help methods.
Improve reliability The type of seal selected, the setting by which it operates, and crucially, the tank assist system which provides the water to maximise seal life, combine to provide the solution to extreme water waste and power use.
Modern double mechanical seals have two sets of faces, one sealing to the process fluid and one to environment, with a barrier space between the two. They are designed to meet the arduous requirements of heavy responsibility slurry functions, with fortified metal elements that are highly resistant to corrosion and erosion. Large ports and increased radial clearances mean the lubrication which is vital to optimising seal life is maintained constantly and constantly.
A pressurised barrier tank system is central to the environmental sustainability of this answer. It employs a thermosiphon course of which provides clean, cool water to the barrier house between the double seals at a stress higher than the product strain, guaranteeing a constant, stable and clean fluid film to maintain the seal faces cool and lubricated.
As the mechanical seals generate warmth, the new water within the barrier area rises to the tank and is radiated to the environment, permitting the cooler, denser water to sink again down to supply cool lubrication to the seal faces. Most importantly, the flush water is consistently recycled, flowing throughout the seal faces in a steady loop and lowering leakage to absolutely the minimal, roughly a teaspoonful a day.
While API Plan 32 is unsuitable for servicing a number of slurry pumps in a ‘series train’ with out the want to set up particular pump systems, pressurised barrier tanks provide ratings as much as 435 psi (30 bar), making them best for these functions. Self-topping and self-pressurising, they are also virtually maintenance-free.
Where no plant water supply is out there for topping up the tank methods, or the supply has insufficient strain, fluid delivery models can be selected to produce the barrier fluid to seal faces. These have the added benefits of being in a position to supply a water/glycol mixture or oil to provide freeze safety in extremely cold climates.
Wide-ranging benefits The advantages of upgrading to modern sealing options and help methods were felt by a coal mine in Poland using a slurry pump to supply coal mud at 9 bar (135 psi) to filter press. Flushed packing resulted in huge dilution of product, resulting in significantly increased filtration times and prices. The pump was sealed with a double mechanical seal designed to satisfy the arduous necessities of the method.
The supporting seal tank system reduced leakage and product dilution to virtually zero. Return on funding was swift and the financial savings long-term. The benefits in terms of water conservation have been equally longlasting and the company’s reputation enhanced.
The mining industry must cope with a tough and dear challenge when it comes to maintaining rotating equipment. But the planning, processing and disposal of flush water constitutes an operational and financial burden which is completely avoidable.
And when a company can get rid of water waste at the identical time as rising reliability and lowering long run operational costs, the choice to upgrade to modern techniques ought to absolutely be an ethical imperative as properly as making sound enterprise sense.
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