The first choice for processors
Our CDP has just two major components: MAC's Air Manager System to meter air flow and a precision MAC Airlock to contain air conveying pressure and meter product into the conveying line.

The heart of our control system is the Macturi. We've designed it to meter air flow with extraordinary precision to maintain a stable, smooth movement of product. The Macturi keeps the system stable even under upset conditions.

CDP Systems use MAC High-Pressure Rotary Airlocks to handle high flow rates and long conveying runs. Their rugged construction greatly reduces rotor lift and deflection. To enhance durability and operating performance, the rotor seal has a unique self-aligning feature. Thanks to the positive seal design, the unique end plate seal eliminates shroud cavity blow-by and migration of product into the cavity.

Customers are invited to visit our Houston MACLab™ to see CDP in action. By testing products, we can demonstrate the proper conveying techniques and system configuration.

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Low-Pressure Continuous Dense Phase Conveying Systems (CDP™)

Money-saving low-pressure dense phase conveying for extremely friable, low-density materials.

MAC Low-Pressure CDP Systems provide unmatched gentle handling for fragile food products. MAC's Low-Pressure CDP is the only pneumatic system that can successfully convey many friable processed foods in their intermediate and final stages without loss of product integrity.

Over a decade of research has gone into developing our Low-Pressure CDP Systems. They are built and backed by MAC, the leading manufacturer of pneumatic conveying equipment.

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Ingredient Systems

Designed for Unique Needs
Every process facility has unique needs and similarly the needs for micro and minor ingredient systems can also be unique. Our designs increase productivity, provide flexibility and are customizable based on current and future needs.

Modular or Custom Designs
Ingredient scaling configurations can be based on parallel (simultaneous), additive, or individual scaling of ingredients. System design is based on the required scaling accuracy, number of ingredients, mix formulas and frequency of mix cycles. Scaled ingredients can be transferred via pneumatics, gravity or mechanical delivery. Ingredient use bins are sized based on the preferred methods of filling and can be designed for manual bag dump, super sack or pneumatic filling as determined by usage and refill frequency.

Process Controls for Optimized Performance
Automated control systems for the micro or minor system are available to match most popular brands of PLCs. They can easily be networked to PCs, OITs and MMIs and long-term support can be provided via modem. Recipe management, data collection and reporting or statistical process control are all available. As with all MAC control systems, each system receives a complete panel and logic checkout prior to shipment. A complete documentation package is always provided with the control system.

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Airlocks

High-Quality, Reliable Services
MAC provides a complete line of rotary airlocks suitable for applications ranging from gravity discharge of filters, cyclones and storage devices to precision feeders for dilute phase and continuous dense phase pneumatic convey systems. Airlock performance relates directly to the material being handled and the application. Please contact us for assistance or advice in the selection of an airlock.

Multi-Duty Airlocks are MAC Equipment’s most versatile airlocks, suitable for many material handling applications. The unique TS4 seal ensures long valve life with minimal maintenance. The valve is designed for operating differential pressures less than 15 PSIG. The unique square inlet flange design allows for direct replacement of many competitive valves by matching flange patterns without exceeding overall height dimensions. The Multi-Duty Airlock can be utilized to convey powder or pellets. High-Efficiency Airlocks feature an integral doweled inspection panel for access to the interior of the housing and rotor and an angled, cast inlet to reduce shear and distribute wear.

MTA Airlocks are designed for a maximum differential operating pressure of 30 PSIG. They are available in gray iron, stainless steel and aluminum. The MTA rotary valve is designed to be dimensionally interchangeable from flange to flange with the popular FTA rotary airlock.

SEA Rotary Airlocks have an offset inlet and discharge to reduce product shearing of pelletized and chip materials as they pass through the inlet and discharge rotation. These valves also feature round 150 lb. drilling heavy-duty flanges.

TRA Rotary Airlocks have a tapered rotor design to allow rotor adjustment when wear occurs. The TRA features a body vent on the "up" side of the rotation to vent blow-by air from pressure pneumatic convey systems. These valves also feature round 150 lb. drilling heavy-duty flanges.

CV Rotary Airlocks feature a blow-thru end plate design which allows attachment of the convey line directly to the end plates of the airlock. Convey air flows through the CV valve, blowing material from the rotating pockets directly into the convey line. Style “A” CV valves feature an inlet baffle attachment to vent blow-by air as the empty pocket rotates up to be refilled with product. Style “B” CV valves do not include the inlet baffle arrangement.

RV Rotary Airlocks feature inboard bearings and lip seals. These valves are typically used when handling non-abrasive powders or products that will not damage the seal.

OBRV Rotary Airlocks feature outboard bearings and shaft braided packing seals. They are typically used when handling products that will damage the seals and cause bearing failure if product contact occurs.

Heavy Duty Airlocks are ideally suited for low- and medium- differential pressure systems, gravity or volumetric feeder discharge devices.

WG, FS, and FR Airlocks are fabricated airlocks with flexible, wiper blade rotors, designed to be used for applications handling stringy or fibrous products and products that have a high shear rating. These valves are intended to be used in gravity flow applications limited to a pressure of 20” W.C. and 220° F.

All airlocks feature a variety of rotor configurations and right angle or parallel shaft drive arrangements based on specific application and process needs.

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Pulse Jets

MAC Pulse Jet filters can be used in a wide variety of air filtration applications. Depending on the configuration, they can be used as the filter in a dust collection system or as the product receiver in a pneumatic conveying system. Filters can also be equipped with a HEPA high efficiency filter on the clean air exhaust where the air is being reintroduced into the work environment. Contact MAC for all of your industrial filtration needs.

Reliable Filtration
A full line of pulse jet filters is available. All models feature the same compressed air cleaning technology, reliable components and quality construction. Each model includes factory assembly and pre-wiring of the timer board and solenoid valves to ensure proper installation and operation.

Select a MAC Pulse Jet Filter for your next air filtration application.

With the hopper (Style III), the filter can receive the dust through a hopper entry inlet and discharge the collected dust through an airlock for dust disposal or recycling. The filter can also be configured with a pneumatic receiver section and receive product from a vacuum or pressure convey system.

ST filters (Square-housing Top-removal) are counterparts to the AVS filter. Filter media is installed and removed through the clean air plenum of the filter. On larger sizes, the plenum can be designed as a walk-in plenum so that filter media replacement and maintenance can occur in an enclosure. On smaller sizes, or when the option of a walk-in plenum is not selected, hinged doors on top of the plenum provide access to the filter media.

LST filters (Large Square-housing Top-removal) are counterparts to the ST filter. Filter media is installed and removed through the clean air plenum of the filter. The plenum can be designed to be a walk-in plenum so that filter media replacement and maintenance can occur in an enclosure. When the option of a walk-in plenum is not selected, hinged doors on top of the plenum provide access to the filter media. RT filters (Round-housing Top-removal) are counterparts to the AVR filters. Filter media is installed and removed through the topside, or clean air plenum of the filter. On larger sizes, the plenum can be designed as a walk-in plenum so that filter media replacement and maintenance can occur in an enclosure. On smaller sizes, or when the option of a walk-in plenum is not selected, hinged doors on top of the plenum are provided for access to the filter media.

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Dilute Phase Conveying

Dilute Phase Theory
Dilute phase pneumatic conveying systems, also know as suspension flow, operate on the principle that the solids will be suspended in the conveying line air stream. This is accomplished by metering product into a moving air stream. Dilute phase conveying velocities typically are greater than 3500 FPM and material to air ratios are less than 12 to 1. Individual particles in the air stream will have some separation by their suspension in the air stream.

Commonly Conveyed Products
Products commonly conveyed in dilute phase systems include flours, resins and compounds, specialty chemicals, ground feeds, and granular and pelletized products. In many cases, the product needs to be evaluated based on process needs and possibly lab tested prior to final system selection to ensure the desired results can be achieved. Lab testing will also allow the product properties to be evaluated.

System Design
Pressure, vacuum, combination vacuum pressure and vacuum sequencing are the common types of dilute phase systems. The motive gas is typically generated by a positive displacement blower with pressure capability ranging from 2 - 15 PSIG. Pressure systems generally use a rotary airlock as a feed device. A vacuum system simply needs a product flow control device such as a probe box or screw feeder, although rotary airlocks are commonly used.

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Dense Phase Conveying

Dense Phase Theory
Dense phase pneumatic conveying systems operate below the minimum suspension velocity and are characterized by product moving along the bottom of the pipe in slugs or a moving bed. Product is conveyed below its saltation velocity at high differential pressures. Conveying velocities are typically less than 2600 FPM and material to air ratios of up to 100 to 1 are possible. Interaction of the particles in a dense phase system is greater than in dilute phase systems.

Commonly Conveyed Products
Common applications for dense phase systems include products with heavy bulk-densities, abrasive products, friable products, blended products and in some instances products that do not require continuous delivery to their destination. In many cases, the product needs to be evaluated based on process needs and possibly lab tested prior to final system selection to ensure the desired results can be achieved. Lab testing will also allow the product properties to be evaluated.

System Design
Pressure vessel systems are the most common dense phase system. MAC's innovative Continuous Dense Phase (CDP) and Low Pressure Continuous Dense Phase (LPCDP) offer other dense phase options. Single vessel systems typically will operate in four distinct cycles:

1. Load vessel with product
2. Pressurize vessel
3. Convey product
4. Purge

Dual vessel systems can be configured to operate in a semi-continuous dense phase manner where the first vessel loads with product while the second vessel conveys the product. The motive gas typically will be compressed air with system pressures operating up to 80 PSIG. Due to this, the vessels need to be ASME Code stamped.

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Vacuum Dense Phase Conveying

Vacuum Dense Phase Theory
MAC Vacuum Dense Phase (VDP) pneumatic conveying systems offer end users the flexibility of a vacuum system with the product protection properties of a dense phase conveying system. Using high vacuum pumps and special feeding mechanisms, moving slugs of material are formed and conveyed at sub-atmospheric pressures. The result is minimized pipe friction and maximum protection for multiple applications.

Commonly Conveyed Products
Products commonly conveyed in vacuum dense phase systems include: friable products, blended products and abrasive materials. These products include sugar, pet food products, carbon black prills, plastic pellets, detergents and more. In many cases, the product needs to be evaluated based on process needs and possibly lab tested prior to final system selection to ensure the desired results can be achieved. Lab testing will also allow the product properties to be evaluated.

System Design
MAC Vacuum Dense Phase Systems are designed for simple operation, reduced horsepower, minimal capital investment and ease of maintenance. MAC VDP systems can be designed as automated material handling systems featuring either batch or continuous operation.

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Hoppers

Storage, Containment and Scaling
A complete line of hoppers is available for intermediate storage, containment and scaling of products. Integration of flow aid devices can promote consistent flow of products that have non-free flowing tendencies.

Available hoppers include:

Airlock surge hoppers

Work bins with capacities ranging up to 1000 cu. ft

Scale hoppers with capacities up to 140 cu. ft

Storage silos

Non-standard and custom hoppers are available to fulfill the needs of custom design requirements.

Bag dump hoppers are available with integral filters and fans, or with dust hoods for aspiration of airborne dust to a remote or central filter.

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Diverters

Complete Line of Product, Gravity and Air Diverters
A versatile line of product and clean air diverters are available in 22.5 degree, 30 degree, 45 degree and 90 degree deflection angles for use in diverting air-conveyed or gravity-flow products into either of two destinations or from either of two sources to one destination.

Product Diverters:

BV Diverters are available in both 30 degree and 45 degree angles with port to port rotation of 150 degrees. This valve is designed for pellet handling applications at line pressures up to 15 psi and has a machined housing with Teflon packing gland seals, bronze shaft bushings and flanged 150 lb. drilling inlet and outlet connections. Valves are available in either aluminum or stainless steel construction.

YV Diverters feature a stainless steel diverting blade that diverts at a 22.5 degree angle. The valve includes a replaceable resilient urethane sleeve to provide a tight seat for the diverting blade. Units are available in either cast iron, cast aluminum, or stainless steel and are designed for systems operations up to 15 psi.

Sealed Blade Line Diverters divert product at a 30 degree angle. This valve features a heavy-duty wear blade with a synthetic polymer insert to seal against the valve end plates.

SD Diverters discharge into scale hoppers and feature a stainless steel diverting blade and extended spout to minimize carry-over of product from the scale hopper. The valve includes a replaceable resilient urethane sleeve to provide a tight seat for the diverting blade.

Gravity Flow Diverters:

Gravity Flow Diverters feature a urethane seal sandwiched between 10 ga. plates and include flanges on all connections. Gravity flow diverters are for use in gravity-flow systems only, operating at pressures less than 20" W.C. and temperatures less than 80º F.

GA Diverters are designed to divert product flow from one source to two use points within a gravity system. The angle of each leg is 30 degrees off vertical centerline.

GY2 Diverters are designed for gravity systems with one straight through leg and a second leg to divert product flow at 30 degrees.

GY3 Diverters are three-way, gravity-flow product diverters.
 

Air Diverters:

AD Air Diverters are designed to direct the flow of clean air from an air source to one of two use points. Or it can be used for one of two air sources delivering to one use point.

DV Dump Valves are designed to direct the flow of clean air from a vacuum filter receiver, or loader, to a vacuum source. The dump valve allows multiple vacuum receivers configured with the valve to share one common vacuum blower.

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Cyclones

Product Separation and Filtration
The primary function of a cyclone is to separate product from a gas stream. After separation, the product discharges out the bottom of the cyclone and air discharges through the top exhaust.

System Design
Cyclone design is application-specific based on material size distribution, specific gravity and inlet velocities. Therefore, varying efficiencies will result, depending on the cyclone design selected. In bulk powder handling systems, it is advisable to incorporate a filter as a secondary high efficiency separator. The filter then captures the particulate emissions from the cyclone and efficiency is based on the filter media selected. In final consideration, the degree of separation efficiency and performance reliability will determine the types of separation devices incorporated in the system design.

Cyclones available from MAC include: Airflow ratings from 100 CFM to 72,000 CFM for a variety of applications including dryer and cooler emissions control. Pneumatic receivers for powders and pellets. Primary and secondary separators for wet and dry products, and elutriators for pellets. Designs with and without vortex chambers. Available in carbon steel, stainless steel and aluminum construction.

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Bin Vents

See "Pulse Jets AVS/AVR Filters" (above)

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