Rotary Valve regulate the flow from one chamber to another while maintaining a good airlock condition. The product is mainly in dry powder or granular form. In the dust filtration field good airlocks are essential on cyclone and bag filter applications in order that the manufacturer’s quoted high dust collection efficiencies can be maintained. Airlocks are also important in the pneumatic conveying industry, where product is regulated into a high pressure conveying line while minimising air leakage.

Signs of industry recovery at bauma CONEXPO AFRICA amidst regional economic challenges 14167 visitors attended the trade fair The premier trade fair for construction machinery, building material machines, mining machines and construction vehicles in Africa has firmly established itself in the market following its third edition. 454 exhibitors from 34 countries and 14,167 visitors attended the international trade fair,“The trade fair reflected a sense of renewed optimism and highlighted the opportunities in the industry, despite recent economic challenges”, Stefan Rummel stated, Managing Director of Messe München. Petra Kaiser, Senior Director of International Exhibitions & Events at the Association of Equipment Manufacturers (AEM), added: “It is significant to have a consistent and engaged presence in the region in order to take advantage of long-term business potential. bauma CONEXPO AFRICA creates a platform to help facilitate these  opportunities.”

In one of its most recent surveys, the Chambers of Mines estimated that the mining industry was responsible for creating approximately 450,000 direct jobs in South Africa. The most recently published Fraser Institutes
research also reported that South Africa had Labour Regulations/Employment Agreements and Labour Militancy/Work Disruptions which could act as a relatively high deterrent to investment.

Leading property development group, Montague Properties partnered with heat tracing specialists eltherm South Africa to overcome temperature maintenance challenges in its water reticulation systems at Jackal Creek Golf Estate in Roodepoort, Johannesburg, Gauteng.

Economists expect the Zambian economy to grow at a faster pace in 2018 due to higher investment inflows and strong agricultural and mining output (Zambia Economic Growth, FocusEconomics, Jan 2018) and this growth is expected to continue in 2019. The Zambian mining industry is also expected to expand steadily over the next eight years as the prices of key minerals trend higher and the regulatory environment remains favourable.

With the ever-increasing use of variable speed drives for pump systems, the question of what specifically an inverter duty motor is, seems to remain unclear to many. Reece Robinson, senior technical trainer for the Grundfos Technical Institute, attempted to bring some clarity on the subject during a recent international webinar.

From wine farms to the mining industry, the new LTP-B Eco drive from SEWEURODRIVE is finding application in a range of sectors. The purpose-built drive is distinguished by the fact that different parameters can be set for a range of functions, from fan to pump control. While SEW-EURODRIVE does have general-purpose units
for fans, pumps, and even conveyors, it initially saw a niche for a unit specifically for the Heating, Ventilation and Air-Conditioning (HVAC) industry, targeted at building designers focusing on ‘green’ design, National Sales Manager Norman Maleka comments.

With the rainy season approaching in most of South Africa’s mining regions, monitoring the capacity of process water return ponds becomes increasingly critical – to monitor whether silt build-up is jeopardising the dams’ functioning. “Managing the water balance on mines is becoming more demanding as mines work to become more
self-sufficient, and to draw less water from municipal sources,” says Lee Vine, managing director at dredging and dewatering specialist, Integrated Pump Rental.

Construction company, Pace Contracting recently completed removal and installation of three vertical turbine pumps, used in emergency flooding situations in downtown Louisville, Kentucky. Integral to the project were four 50-ton capacity Straightpoint (SP) wireless compression load cells supplied by Lifting Gear Hire (LGH).

Anyone who buys dewatering pumps should not just focus on the pumping quantity and delivery head. The ability of a pump to withstand the loads it is subjected to primarily depends on its design and components – and these are hidden inside the pump. What are the things to look out for?

Desalination must form part of the future water-source mix in a large coastal city in a water-scarce environment like Cape Town. However, it must be carried out responsibly from an environmental and financial perspective. The impact of higher water tariffs to fund water augmentation schemes will be long-lasting, and may be a future burden for ratepayers, especially when the drought is past, Hatch’s Pieter de Kock cautions.

They offer improved safety, compact layout, factory-tested systems and sole source responsibility for the system if problems arise. During a recent webinar Todd Loudin, president of North American operations and vice president of global sales for Flowrox, shared his insights on these systems.

Robust valves and actuation accessories for the mining industry

The range of valves and actuation accessories from AR Controls of Vanderbijlpark is very robust and extremely well-suited for typically harsh mining environments. Here valves and accessories often suffer environmental attack and can perish as a result. AR Controls provides pneumatic enclosures in various materials to house and protect valve instrumentation, and to ensure that valves installed in hard-to-reach areas can be operated with ease from an accessible and clearlymarked remote area.

Diaphragm operated control valve solutions

A diaphragm style, pilot operated pressure relief valve responds only to a high pressure wave. If the standard
operating pressure is 105psi (7bar), you can choose to set the relief pressure on the pilot slightly higher: for example, at 115psi (7.5bar). If an overpressure occurs (fast closing valves, etc.), the relief valve quickly opens and discharges water to atmosphere and reduces the overpressure. When the pressure has stabilized, the pressure relief valve closes and normal operation of the system resumes.

Doubling valve lifespan

Problems with the valves can lead to unplanned downtime and equivalent losses in output. This is why saving on valves can end up being expensive. With the help of Metso’s service experts, the Tarkwa mine has been able to achieve consistent reliability, leading to improvements in the plant’s overall efficiency.

A platinum concentrator in Rustenburg was experiencing problems with their original feed splitter in the plant keeping an equal split to the two flotation banks. eDART Slurry Valves (Pty) Ltd was asked to assess the feed splitter operations and make corrective recommendations. Richard Rule, Director, eDART Slurry Valves said “The
mine had a simple feed splitter to two parallel rougher flotation banks. The aim was to split the feed to the two
banks evenly by volume. 

Enhanced performance, greater reliability and longer life: that’s the reputation OMAL’s ball valves have built across the world’s process industries over the last 30 years. OMAL manufactures a complete range of ball valves
for the process industry, which are distributed in sub-Saharan Africa exclusively by drive and control automation specialists Tectra Automation. The company maintains a number of these valves ex-stock, including wafer and split wafer valves and Thor Split Body valves in both carbon steel and stainless steel versions.

A more than customer-supplier relationship between specialist pipeline contractor, JDC, and thermoplastic piping supplier, Plasti-Tech, was the recipe for success on a challenging pipe installation project recently completed by JDC for Henric Ferro Chrome in the North West Province of South Africa. In business, maintaining strong working relationships means everything. Strong working relationships are entirely possible, but it takes trust and transparency on both sides.

Multi Alloys (Pty) Ltd recently boosted its product offering with the addition of centrifugal castings. “With effect from 1st October 2017 we are able to offer customers centrifugally cast pipes and similar axial-symmetric items,” says director Ken Perel.

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