Blog

  • Crushed Limestone Conveying Systems, Poland

    System loaded on transport vehicle The Mactenn (a sister company of Macawber Engineering Inc. in the U.S.) Macpump T150, a single system, but with two vessels. As one is conveying, the other is filling and preparing to convey. The pneumatic conveying distance is 900.68 m horizontal and 19.81 m vertical conveying over 100t/h of crushed limestone. The convey line starts at 304.8 mm and finishes at 355.6 mm. This was a challenging application d... read more

    What is the difference between dilute phase and dense phase pneumatic conveying?

    Dilute phase conveying occurs at or above the saltation velocity of the material. Dense-phase conveying occurs below the saltation velocity. There are various regimes of dense phase conveying. Bed flow, slug flow, solid flow, etc. These regimes are determined by the characteristics of the material and the conveying velocity. You can read more about dense phase pneumatic conveying elsewhere on the Mactenn website. Click here to contact Mactenn (... read more

    Case Study: Mixed Mortar Conveying Systems, Holland

    The low velocity dense-phase pneumatic conveying system supplied conveys in 90t/h of mixed mortar over a distance of 109.728 m horizontal and 35.052 m vertical. The system uses a 1.47248 cubic meter vessel with a 203.2 mm pipe line. The system is located under a mixer which in turn is fed by multiple product feed hoppers. The starting and stopping sequence of the system is controlled automatically from a central control room via an internet con... read more

    Why Mactenn?

    Mactenn Systems Ltd. is part of Macawber Group, specializing in the dense-phase pneumatic conveying systems. The Group has stayed true to its core business for over 40 years. While other companies have been distracted by diversification and/or been taken over by larger companies, the Group has stayed on the course for becoming an expert in everything related to low velocity, dense-phase pneumatic conveying, frequently called in to deal with diff... read more

    Pneumatic Conveying of Fish Food Pellets

    Pneumatic Conveying of Fish Food Pellets Two dense-phase pneumatic conveying systems were supplied to handle 31751.5 kg per hour of Fish Food Pellets over a distance of 80.772 meters horizontal and 27.432 meters vertical. The systems were 0.849505 cubic meter vessels with a 254 mm pipe line. Both systems were located under a feed hopper with start and stop controlled in automatic mode by the feed hopper and silo reception level probes. The ... read more

    What do we need to know to pneumatically convey our chunky slightly sticky material

    Pneumatic Conveying First of all decide what kind of dense-phase pneumatic conveying regime is required – dilute phase or dense-phase. Dilute phase relies on a high air flow to maintain the material particles in a suspended condition. With chunky material the velocity to achieve complete suspension is extraordinary high and not very practical. So dense-phase conveying, which does not rely on a high velocity for conveying is a better ch... read more

    Case Study: Coal Dust & Pellet Conveying Systems, Holland P2842

    Maxflo 85/8-3 pneumatic conveying systems  Three dense-phase, low velocity pneumatic conveying systems were supplied to convey coal dust between 1.5 t/h and 2.7 t/h over a distance of 160 m horizontal and 9 m vertical. Three systems were running on a 76.2 mm convey pipe line. All pneumatic conveyors are located under a feed hopper with start and stop controlled automatically by the feed hopper and silo reception level probes. The material... read more

    Bed Ash Pneumatic Conveying Systems, Sardinia.

    Bed Ash Pneumatic Conveying Systems, Sardinia.

    Three Mactenn (a sister company of Macawber Engineering Inc. in the U.S.) dense-phase pneumatic conveying systems were supplied to convey bed ash between 5t/h for the two smaller conveying systems and 56t/h for the larger system 3. Material transfer distances are between 48.158 m and 70.104 m. The ash systems use 2 x 0.113 cubic meter vessels with 101.6 mm pipe lines and system 3 uses a 0.8495 cubic meter vessel on a 254 mm pipe line. All dense-... read more

    Hot Stuff! High Temperature valve for Dense-Phase Conveying and more

    One of the notable features of Mactenn (a sister company of Macawber Engineering Inc. in the US) pneumatic conveying systems is their ability to handle hot materials. We first encountered hot material applications in the foundry industry. A common application is the handling of hot knock-out sand (the remains of the sand mold after the hot metal has been poured and the casting made) which could reach temperatures of 350-400C°. The problem wi... read more

    Fly Ash Pneumatic Conveying Systems, Poland

    Two Mactenn fly ash dense-phase pneumatic conveying systems were supplied to convey 30t/h each over a distance of up to 385 meters horizontally and 36 meters vertically. The ash systems are designed to convey 31,500 Kg/h of ash. Both conveying systems are located under a feed hopper with start and stop controlled in automatic by the feed hopper and silo reception level probes. The fly ash systems are working very reliably with no line blockages... read more

    Service Life of Dense Phase Pneumatic Conveying

    [P3674] Mactenn Installation Case Study: Sodium Bicarbonate Conveying System, Northwich, UK. In brief: The dense phase pneumatic conveying system was supplied to convey 14 t/h of sodium bicarbonate over a distance of 8m horizontal and 30m vertical. The system is a 228 liter Maxflo with a 125mm pipe line and is located under a feed hopper with start and stop controlled in automatic by the feed hopper and silo reception level probes. The sy... read more

    Mactenn Announces Collaboration with Lysair

    Mactenn is proud to announce that Lysair Air Solutions will become the exclusive representative of Mactenn in Belgium, the Netherlands, and Luxembourg. They will also be the non-exclusive representative in France.   Lysair will develop the market for dense phase pneumatic conveying systems in Benelux and France. The parties will combine forces; Lysair will add scope to its existing offering by including Mactenn’s dense-phase equi... read more

    Mactenn Design Philosophy

      1.Dense phase pneumatic conveying pressure vessels were introduced to the U.S. markets in the early 1960’s.  Pressure vessels were used because the pressures required for dense phase conveying normally exceeded 15 psig – the limit at that time for rotary airlock valves which were used almost exclusively by manufacturers of positive pressure dilute phase systems. In order to accommodate the higher pressures necessary f... read more

    Blocked Pipelines? No problem for Mactenn

      What are the reasons for blocked conveying lines? All pneumatic conveying systems block sometimes.  Clearing a pipeline means downtime, loss of production and can be a maintenance headache so ensuring your system runs as smoothly as possible day after day is critical. Here at Mactenn we have been designing pneumatic conveying systems for years using our knowledge and experience to design systems that aim to provide the most reli... read more

    Another 3-way Diverter Valve Tested Successfully

    We have successfully tested another 250 mm Stainless Steel 3-way T-Type Diverter Valve to be used for conveying fish food. The Diverter Valve is designed to be used in dense-phase pneumatic conveying applications for handling fragile materials minimising material breakage. The diverter valve is also available in the US via our sister company Macawber Engineering   To find out more information about Mactenn please click here ... read more

    Dense Phase Pneumatic Conveying and Its Benefits

    Dense Phase Pneumatic Conveying and Its Benefits

    Dense phase pneumatic conveying is best described as using the lowest attainable material velocities to ensure the majority of material remains below the saltation level. It is a simple, efficient, cost effective and safe mode of transport particularly beneficial for handling difficult to convey materials. What are the benefits of dense phase pneumatic conveying? *Low air/energy consumption (cyclical and autonomous functionality) *Minimal mate... read more