Water waste is often deemed an unwanted, however inevitable by-product of mining processes. Yet modern pump sealing expertise exists which may virtually get rid of this waste whereas conserving power, enhancing pump reliability and attaining long run operational financial savings.
Water is probably considered one of the most vital, and increasingly imperilled, assets on earth. That much is known and acknowledged by industries throughout the globe.
However, additionally it is one of the unnecessarily squandered assets in mining operations. And whereas the business has begun to embrace efficiency and sustainability-led advances such as automation and renewable vitality, it stays steadfastly set in its methods when it comes to slurry pump technology.
Three approaches are routinely specified by pump manufacturers to seal slurry pumps: mechanical packing, expellers (also generally identified as ‘dynamic’ seals’) and single mechanical seals. All come with vital limitations, including poor reliability, reduced mean times between failure (MTBF), intensive upkeep requirements and higher operational costs.
These components alone should give mine managers cause for a re-evaluation of the sealing methods used on slurry pumps. However, any company with a commitment to the International Standards Organisation ISO-14001 Standard for environmental administration methods and ISO-50001 Standard for power management techniques ought to pay attention to the extreme water waste and high vitality consumption that results from choosing these conventional sealing methods.
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 one of the most wasteful elements 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 each single slurry seals and expellers require a provide of cool, clear flush water to be injected into the process at excessive stress, sustaining a steady fluid film between the delicate seal faces to keep them cool and lubricated, whereas forcing the damaging slurry away.
The flush water required in all three sealing approaches is equipped from an external supply and injected into the method at the next stress than the stuffing box stress, in line with the business normal American Petroleum Institute (API) Piping Plan 32. Water which doesn’t leak onto the ground or into the process is shipped to the tailings dam. This additionally has an impact on the water stability of the plant.
This approach constitutes a lack of clear water amounting to billions of gallons a 12 months globally. One giant, standard slurry pump sometimes consumes 10 US gallons (37.eight litres) per minute, amounting to five.2 million US gallons (19.6 million litres) of water every year – a stunning statistic by any measure.
At a time when global water supply is predicted to fall in want 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 extreme water use, and the higher energy consumption it entails, remain embedded in the processes of many mining firms. Worse still, it’s honest to say that it’s often accepted as simply ‘par for the course’ by reliability engineers and administration alike.
But the fact is that water waste on any scale is a totally unnecessary feature of slurry operations as it might be almost totally eliminated just by employing superior double mechanical seals and trendy water management help methods.
Improve reliability The sort of seal chosen, the surroundings in which it operates, and crucially, the tank support system which supplies the water to maximise seal life, mix to provide the solution to excessive water waste and vitality use.
ราคาpressuregauge have two sets of faces, one sealing to the method fluid and one to environment, with a barrier house between the 2. They are designed to meet the arduous necessities of heavy obligation slurry purposes, with fortified steel components which are highly proof against corrosion and erosion. Large ports and increased radial clearances mean the lubrication which is significant to optimising seal life is maintained continually and consistently.
A pressurised barrier tank system is central to the environmental sustainability of this resolution. It employs a thermosiphon process which supplies clear, cool water to the barrier house between the double seals at a stress higher than the product stress, ensuring a constant, stable and clean fluid film to keep the seal faces cool and lubricated.
As the mechanical seals generate warmth, the new water in the barrier house rises to the tank and is radiated to the ambiance, permitting the cooler, denser water to sink back down to offer cool lubrication to the seal faces. Most importantly, the flush water is constantly recycled, flowing across the seal faces in a steady loop and reducing leakage to absolutely the minimum, roughly a teaspoonful a day.
While API Plan 32 is unsuitable for servicing a quantity of slurry pumps in a ‘series train’ without the necessity to set up special pump methods, pressurised barrier tanks supply ratings as much as 435 psi (30 bar), making them ideal for these applications. Self-topping and self-pressurising, they are also nearly maintenance-free.
Where no plant water provide is available for topping up the tank systems, or the provision has insufficient strain, fluid supply items can be chosen to provide the barrier fluid to seal faces. These have the added benefits of having the ability to supply a water/glycol combination or oil to provide freeze protection in extremely cold climates.
Wide-ranging benefits The advantages of upgrading to modern sealing options and assist techniques were felt by a coal mine in Poland using a slurry pump to produce coal mud at 9 bar (135 psi) to filter press. Flushed packing resulted in big dilution of product, resulting in tremendously increased filtration occasions and prices. The pump was sealed with a double mechanical seal designed to fulfill the arduous requirements of the method.
The supporting seal tank system reduced leakage and product dilution to just about zero. Return on funding was swift and the financial savings long-term. The benefits in phrases of water conservation have been equally longlasting and the company’s popularity enhanced.
The mining business must take care of a tricky and costly problem in relation to sustaining rotating tools. But the planning, processing and disposal of flush water constitutes an operational and financial burden which is completely avoidable.
And when a company can eliminate water waste concurrently increasing reliability and lowering long run operational prices, the decision to upgrade to trendy methods should certainly be a moral crucial in addition to making sound enterprise sense.