Our Products #5146475

HIGH-TEMPERATURE RECIRCULATION AXIAL FLOW FANS
Single Direction and Reversing Flow Applications
Robinsons laboratory facilities are designed for both air performance and sound testing. Qualified lab personnel use state-of-the-art instrumentation to ensure accurate test results.

The emphasis on quality at Robinson is backed by expert workmanship and a thorough quality control program. Dye penetrant testing, magnetic particle inspection, sonic testing, vibration analysis and x-ray testing are all utilized to ensure that Robinson-built fans provide long, reliable service.

Robinson Fans engineers and custom builds high-quality air-moving equipment for industry. This expertise is supported by the latest computerized technology as well as by years of personal engineering evaluation and more than 110 years of fan-building experience. Each fan is precision engineered for its particular application to effectively and efficiently move air.

The Robinson reputation for unique and superbly designed air-moving equipment is well demonstrated by its experience in building special alloy axial flow fans for continuous operation at high temperatures. Thermal expansion is a major consideration in the design of fans for atmosphere furnaces.

Robinson axial flow units are designed for continuous operation at temperatures ranging from 70F to 2, 000F, depending on the application and the materials used in construction of the fan.

Flexibility in design permits Robinson to offer both round and square plugs to accommodate a wide range of furnace requirements. Easy accessibility for preventive maintenance is an additional feature standard at Robinson.

Research Lab: High Temperature Axial Flow Fan Testing
In our laboratory facilities, R&D personnel have actually built furnace mockups to custom-test axial flow high-temperature fan prototypes. This testing is performed within certain furnace configurations with designs predicated on customer engineering and design data. Fan inlet conditions created by testing procedures simulate actual entry conditions on axial fans as they are installed in the furnace. Robinson also runs full-scale mechanical tests on units prior to shipment.

Utilizing years of experience in building high-temperature fan equipment, Robinson is also involved in satisfying customer requirements in the area of fan repair and rebuilding . The Robinson RR program, greatly expanded by rebuilding facilities in Lakeland, Florida, and new large-capacity electronic dynamic balancing equipment, offers a highly favorable alternative to higher capital costs while retaining the same quality service and materials found in Robinson original equipment. Robinson repairs and rebuilds all types of industrial fans, regardless of original manufacturer.

Robinson maintains an expert team of field service representatives who are available for troubleshooting, balancing andor on-site inspection of fans and other types of air-moving equipment. These personnel perform certain on-site repairs or, if necessary, determine whether or not the fan must be returned to a Robinson plant for repair or rebuilding .

Repair and Rebuilding A Cost-Efficient Alternative
As an alternative to the higher costs of designing and building new axial flow equipment, the repair andor rebuilding of existing fans is an option many Robinson customers are choosing today. Robinson also redesigns and upgrades existing fan equipment for increased capacity and efficiency.

The people at Robinson understand that downtime due to fan failure can mean lost revenue, so repairrebuilding projects are expedited through the plant.

In response to the confidence shown in Robinson, as demonstrated by the number of customers sending fans to the plant for repair, Robinson has greatly expanded its RR program. Expanded production facilities, one of the largest dynamic balancing machines in the country and an additional repairrebuilding plant in Lakeland, Florida , have made Robinson perhaps the finest fan repair concern in the nation.

Fan repair and rebuilding is not a sideline at Robinson; it is an important part of our business. Robinson engineers and production personnel have years of experience utilizing the same type of expert craftsmanship and heavy-duty materials used in new fan construction.

Robinson is often able to recycle various original components from the old fan, such as the shaft or hub, to save the customer both valuable time and money. And, Robinson will also rebuild or repair any fan, whether it was built by Robinson or a competitive manufacturer

If your fan shows signs of wear, corrosion, abrasion or unbalance, call to arrange a visit by Robinsons field service representatives. Catching the problem before it becomes critical and repairing fan equipment during a scheduled shutdown can save time and money.

Industries Served
Steel
Mining
Cement
Ceramic
Chemical
Woodworking
Industry Applications
Building ventilation
Fume removal
Dust removal
Dust collection
Pneumatic conveying
Oven and dryer exhaust
Combustion air
Incinerators
Heat recovery

HEAVY-DUTY BACKWARD CURVE FANS
Robinson Backward Curve (BC) industrial fans represent a versatile fan series for quiet, high efficiency service. The Backward Curve design, for forced or induced-draft service, is used for a wide range of applications in many industries. BC fans are engineered and built to accommodate capacities to one million cfm and pressure ranges to 120 inches water pressure.

BC Series fans from Robinson are currently in operation in cement, power, coal, lime and paper facilities throughout the U.S. and the world. Robinson builds BC wheels to 180 inches diameter and, as required, units are constructed of special alloy materials.

Induced-Draft and Forced-Draft Service
Heat Recovery
Incineration
Air Pollution
Waste-to-Energy
Boiler Operations
Fluidized Bed
Combustion Air
Process Air
ResearchPerformance Testing
The BC fan is available from Robinson as a result of ongoing research and testing in Robinsons lab facilities. BC prototype fans have been tested by Robinson on the basis of air performance, sound and vibration. Test data and field experience provide Robinson with the expertise to engineer and build fans for quiet, high-efficiency service.

Engineering
Robinson engineered fans are designed to satisfy the requirements of individual applications and service conditions. Finite element stress analysis and resonant frequency testing are utilized to engineer fans that are dependable for optimum performance.

BC Repair and Rebuilding
Robinson Fans offers extensive repair and rebuild services as an alternative to new or replacement equipment.

Fan repair is cost effective
Robinson determines and corrects causes of equipment failure.
Robinson re-uses original components when possible.
Robinson incorporates unique design features for improved efficiency.
Wear, corrosion, component damage and material buildup lead to fan failure and costly system shutdown. A thorough maintenance program and periodic inspection of equipment help prevent problems.

Robinsons team of service representatives is available for fan inspection and emergency consultationservice.

Primary Industries Served
Steel
Mining
Cement
Ceramic
Chemical
Woodworking
Typical Air-Moving Applications
Building ventilation
Fume removal
Dust removal
Dust collection
Pneumatic conveying
Oven and dryer exhaust
Combustion air
Incinerators
Heat recovery

BACKWARDLY INCLINED INDUSTRIAL FAN TYPE J
The Robinson backward curve unit is designed to give quiet, highly efficient, stable operation through a wide performance range with the protection of absolute non-overloading characteristics.

Both the airflow principles and structural design feature incorporated are based on 60 years in the fan design application and manufacturing business.

The heart of the unit is a 12 blade rotor of shrouded design. The 12 blades are welded to a heavy back plate. The hub assembly is in turn attached to the back plate on most sizes through a second heavy plate approximately one-half wheel diameter. A fabricated steel cone is used to ensure squareness of the hub to the back plate and to complete the assembly. All rotors are statically and dynamically balanced to G-2.5 on special equipment to ensure smooth operation at operating speed. The rotor is mounted on machined shafting of extra-heavy size which in turn is carried on bearings as described in later pages.

Housings are fabricated throughout with electric welding except when specifically requested otherwise. Material gauges meet or equal all standards in the various classes. Bracing in excess of required standards is furnished on all size units.

The spun inlet piece is the final major component. Designed to give desirable flow conditions to the unit and manufactured to close tolerances to maintain minimum running clearances, it ensures the excellent operating characteristic as illustrated on the accompanying curve.

Robinson Fans, Inc. has furnished all welded construction in fan equipment of all classes, wherever possible, since 1925. Experience has proven it the most desirable type of construction where access area can accommodate the size of the units thus formed. It gives extra strength, increased rigidity, and cleaner appearance.Classes and Construction
Type J Fan

This bulletin covers class I and class II equipment. Type J fans are also produced in the class III and class IV range and, by contacting your nearest representative or the home office, proper sizes and performance can be supplied for any desired performance in these ranges. Our company, after 110 years of experience as custom fan builders, feels than when operating conditions in excess of class II requirements are encountered, a better job can be done for the customer by dealing individually with his application.

Class I equipment is designed for operation against a maximum 3-34" water gauge total pressure when handling air of a density of .075 pounds per cubic foot and a maximum wheel tip speed of 10, 000 feet per minute.

Class II equipment is designed for operation against a maximum of 6-34" water gauge total pressure when handling air of a density of .075 pounds per cubic foot and a maximum wheel tip speed of 13, 000 feet per minute.

All fans are furnished with fixed housings as standard, universal housings optional for sizes 12" 36-12". Fan discharges are available to the locations indicated in the dimension sheets for either the standard fixed housing or the optional universal housing.

Split housings are available as an option. All welded construction standard. Bolted construction can be furnished if requested. All standard discharges furnished. Other discharges are available on request.

Bearings
Anti-Friction Bearings

Heavy series, grease-lubricated, self-aligning, ball bearing pillow blocks, such as illustrated will be furnished as standard equipment on shaft sizes up to and including 3-1516".

Spherical roller, self-aligning pillow blocks, as illustrated, will be furnished as standard equipment on shaft sizes 4-716" and larger.

Timken Roller pillow blocks are available on all sizes at a slightly higher cost.

Sleeve

Sleeve bearings furnished are the Dodge self-aligning Sleevoil pillow block. This is a babbitt-lined, ring-oiling, self-aligning lock with special seals specifically designed for fan work. Oil lubricated, it can be piped for remote indication and filling through a site glass provided on the unit. Collars for thrust loads can be installed within the bearing housing.

This bearing can be provided with water-cooled features for high-temperature operation.

Arrangement No. 2 Ball Bearing Pillow Block

Ball bearing fan and blower pillow block equipped with two precision, single-row, deep-groove ball bearings. The inner race is locked to the shaft through set screws so that both radial and thrust load carrying capacity are provided. Bearing effectively sealed for grease lubrication.

A bronze bushed fan and blower pillow block will be furnished. Pillow blocks are fitted with two bronze bushings of high lead content and two T section oil rings. Two steel thrust collars adjustable from the outside are used. Piston ring seals keep oil chamber sealed. Oil gauge can be placed on either side of the pillow block and can be piped to extended distances. Oil indication and filling through site glass gauge.

Optional Extras
Outlet Dampers

Outlet dampers of the multi-leaf, airfoil blade design are offered. Generous shafts mounted in ball bearings, bolted to set-out plates for temperature operations are interconnected for operation by a single lever. Quadrant locking device furnished if requested. Positive air seal at shaft is ensured by design. Bolting flanges both sides to attach to fan outlet flange and duct.

Inlet Dampers

Inlet dampers are of the multi-leaf type, made of a set of pivoted radial blades suitable for power saving where wide operating range is encountered. Operating mechanism is outside of the air stream. Bolting flanges are located on both faces. Single lever control for automatic operation or quadrant locking, as requested, and may be interconnected on double-inlet installations.

Inlet Screens

Inlet screens of heavy mesh, double crimp wire with outside frame for bolted attachment and ease of removal can be provided.

Inspection Doors

Inspection doors of the bolted design are provided. Set-out doors can be provided on casings where insulation of the casing is contemplated. Quick-opening inspection doors can be supplied on special request at extra cost.

Guards

Belt guards and coupling guards of fabricated steel and expanded metal can be provided where necessary to ensure protection from moving components.

Bearing Pedestals

Independent bearing pedestals of heavy welded steel construction are available on arrangement No. 3, single inlet and double inlet, at extra cost.

Isolation Bases

Isolation bases of various designs can be supplied to eliminate transmission of vibration from operating unit to mounting floor. Units can be fabricated to receive both fan and driving motor for isolation of complete unit.

Special Construction Features

Units can be furnished in stainless steel, aluminum and other special alloy materials.

Coatings of Neoprene sheet vulcanized to steel, rubber sheet vulcanized to steel, Baked Phenolic or other special coatings of this nature can be furnished.

Other features, such as standard and custom shaft seals, blade liners, temperature and vibration detectors, stuffing boxes, special paints and drain openings are available for all sizes of equipment.

Primary Industries Served
Steel
Mining
Cement
Ceramic
Chemical
Woodworking
Typical Air-Moving Applications
Building ventilation
Fume removal
Dust removal
Dust collection
Pneumatic conveying
Oven and dryer exhaust
Combustion air
Incinerators
Heat recovery

HIGH-TEMPERATURE CENTRIFUGAL FORWARD CURVE FANS
Robinson FC fans are furnished with forward-curve wheels that are ideally suited for applications involving continuous operation at temperatures ranging from 70 F to 2, 000 F. FC Series units are often constructed of special alloy materials for high-temperature service, but are used also for low-temperature operations. Other fan types designed and built by Robinson for high-temperature applications include axial flow, paddle wheel and radial blade series.

Performance Ratings
Robinsons FC design is a result of thorough and exacting laboratory testing. Documented performance ratings from this work enable Robinson to provide equipment for quiet, efficient service over a broad performance range.

Design Considerations
FC fans may be furnished with either non-insulated or fully insulated units.
FC fans are also offered with an insulated plug and non-insulated housing. In this type of construction, the non-insulated housing is usually mounted on the inside wall of the furnace or oven.
All Robinson FC Series are available in multiple fan arrangements. Flexibility in design also allows Robinson to offer both round and square plugs to accommodate a wide range of furnace requirements. Other capabilities include gas-tight designs.
For reliable, efficient service, Robinson has always stressed the importance of preventive maintenance. Fan casings are therefore designed with either plug-type housings or split housings for accessibility to the wheel for service andor removal.
Quality Control
Dye penetrant testing, ultrasonic testing, vibration analysis, x-ray testing and, in some cases, magnetic particle inspection, are utilized to ensure that FC Series fans meet Robinsons stringent quality control requirements. Other steps taken to ensure long fan life include dynamic balancing of the wheel and shaft assembly on independent, computerized equipment. Full-scale mechanical testing is performed on the assembled FC unit (when possible) prior to shipment.

Fan Repair and Field Service
Robinson field service representatives are available for troubleshooting, field balancing and diagnostic inspection of fans and other types of rotating equipment. These personnel supervise certain on-site repairs or, if necessary, determine whether the unit must be factory-repaired.

Robinson repairs and rebuilds FC units as well as all types of industrial fans, regardless of original manufacturer. In addition to fan repair as a cost-saving alternative, Robinson redesigns and upgrades existing air-moving equipment to increase capacity and improve efficiency.

Primary Industries Served
Steel
Mining
Cement
Ceramic
Chemical
Woodworking
Typical Air-Moving Applications
Building ventilation
Fume removal
Dust removal
Dust collection
Pneumatic conveying
Oven and dryer exhaust
Combustion air
Incinerators
Heat recovery

INDUSTRIAL EXHAUSTERS FOR AIR MOVING EQUIPMENT
Materials Handling
The Materials Handling Wheel is designed to handle and move air or gas containing granular materials, dust, buffing and grinding wheel exhaust, wood or metalworking machine exhaust. It is also used for dirty, tough or general industrial materials-handling applications. Wheels are heavy welded steel construction with six radial blades. Sizes from 12"- 84-" diameter, other sizes available. Available in standard and extra-heavy construction.

Paddle Wheel
The Paddle Wheel is a must for extremely dirty air streams or for material-conveying applications. These wheels are of heavy-duty welded construction, furnished with six radial blades, sizes 12" through 85-". Other sizes available.

Housings
All fans are furnished with fixed housings as standard, universal housings as optional, for sizes 12" through 57-". Fan discharges are available to the locations indicated in the dimension sheets for either the standard fixed housing or the optional universal housing. Available fan arrangements are shown in the dimension section.

Split housing available as option. All-welded construction standard. Bolted construction can be furnished if requested. All standard discharges furnished. Other discharges available on request.

Special Features
The IE Exhauster is furnished with standard construction when operating with impeller tip speeds to 15, 00 feet per minute. Extra-heavy construction is required, as indicated by the shaded areas on the multi-rating tables, when impeller tip speeds are in excess of 15, 000 feet per minute. Extra-heavy construction will, in most cases, require an extra-heavy wheel, larger-than-standard shaft and bearings. A heavy-duty casing is furnished on standard and extra-heavy-duty units.

Special Materials of Construction IE Exhausters can be furnished fabricated from mild steel with the following protective coating: dipped or sprayed PVC, sprayed epoxy, aluminized, rubber linings or hot-dipped galvanizing. If required, equipment can be supplied with lead lining. Equipment also can be fabricated from 300 series alloy, monel, inconel, aluminum or other higher-grade alloy of various types. Abrasion-resistant materials also can be furnished.

Temperature Corrections
Where operation temperatures are other than 70 F, determine factor from the curve for the desired temperature. Divide pressure at operating condition by the factor taken from the curve. This provides the 70 F pressure condition. Select fan size from the capacity table, using the CFM desired and the corrected SP. Read the RPM and BHP from the table at this point. For horsepower at operating conditions, multiply the HP from the tables by the correction factor taken from the curve.

Primary Industries Served
Steel
Mining
Cement
Ceramic
Chemical
Woodworking
Typical Air-Moving Applications
Building ventilation
Fume removal
Dust removal
Dust collection
Pneumatic conveying
Oven and dryer exhaust
Combustion air
Incinerators
Heat recovery

HIGH-TEMPERATURE CENTRIFUGAL PADDLE WHEEL FANS
Performance Ratings
Robinson PW fans are furnished with radial bladed wheels specifically suited for applications involving continuous operation at temperatures from 70 F to 2000 F. PW units are often constructed of special alloy materials for high-temperature service, but are also used for low temperature operations. Other Robinson fans designed for high-temperature applications include axial flow and FC (forward curve) blade series.

Robinsons PW design is a result of thorough and exacting laboratory testing and documented performance ratings. These ratings were calculated on the basis of complete fan units, including wheel, casing and inlet section.

Components are also furnished separately by Robinson, but the fan unit must be set up with wheel, shaft, casing, inlet and all other components in place to Robinson design specifications to achieve rated performance.

Design Considerations
PW fans may be furnished as either non-insulated or full-insulated units.
PW fans are also offered with an insulated plug and non-insulated housing. In this type of construction, the non-insulated housing is usually mounted on the inside wall of the furnace or oven.'
All Robinson PW Series are available in multiple fan arrangements. Flexibility in design also allows Robinson to offer both round and square plugs to accommodate a wide range of furnace requirements. Other capabilities include gas-tight designs.
For reliable, efficient service, Robinson has always stressed the importance of preventive maintenance. Fan casings are therefore designed with either plug-type housings or split housings for accessibility to the wheel of servicing andor removal.
Optional designs include inlet and outlet flanges, split housings, inspection doors, inlet or outlet dampers and insulation studs.
Quality Control
Dye-penetrant testing, ultrasonic testing, vibration analysis, X-ray testing, computer finite element stress analysis and, in some cases, magnetic-particle inspection are utilized to ensure that the PW series fans meet Robinsons stringent quality-control requirements. Other steps taken to ensure long fan life include dynamic balancing of the wheel and shaft assembly on independent, computerized equipment. Full-scale mechanical testing is performed on the assembled PW unit (when possible) prior to shipment.

Fan Repair and Field Service
Robinson field service representatives are available for troubleshooting, field balancing and diagnostic inspection of fans and other types of rotating equipment. These personnel supervise certain on-site repairs or, if necessary, determine whether the unit must be factory repaired.

Robinson repairs and rebuilds PW units as well as types of industrial fans, regardless of original manufacturer. In addition to fan repair as a cost-saving alternative, Robinson redesigns and upgrades existing air-moving equipment to increase capacity and improve efficiency.

Industries Served
Steel
Mining
Cement
Ceramic
Chemical
Woodworking

PRE-ENGINEERED INDUSTRIAL AIR MOVING EQUIPMENT
Robinson PE Fans are built with quality materials by skilled, experienced craftsmen for reliability and longevity.

In a market which is increasingly calling for high quality, standard fans with great versatility and a competitive price, the PE Series fan is the answer. The PE (pre-engineered) Series fan is the culmination of over 100 years in the fan design and manufacturing business.

The PE fan is a combination of one of three wheels in a standard housing. This combination allows quiet, efficient operation throughout a broad range of performance requirements. The choice of wheels allows the fan to operate in a variety of air stream conditions.

Each of the three wheels - an airfoil, a backward inclined, and a backward curved - has been designed specifically for this PE application. All three wheel types have undergone extensive stress analysis.

Robinson Fans, Inc. introduced the PE Series with one main goal in mind - to make the inquiry-to-shipment process as quick and easy as possible at a competitive price.

Primary Industries Served
Steel
Mining
Cement
Ceramic
Chemical
Woodworking
Typical Air-Moving Applications
Building ventilation
Fume removal
Dust removal
Dust collection
Pneumatic conveying
Oven and dryer exhaust
Combustion air
Incinerators
Heat recovery

HEAVY-DUTY AIR FOIL FANS
Air foil fans are designed, engineered and tested for airstreams requiring high efficiency and quiet operation. They are used extensively for continuous service to 850F in forced and induced draft applications in the metals, chemical, power generation, paper, rock products, glass, resource recovery, incineration and other industries throughout the world.

Designed for Variable Speed Applications
Robinsons AF Series fans are also designed for use with variable-speed motors. The additional design considerations and requirements of such applications are taken into account during fan development and construction.

Induced Draft and Forced Draft Service
Heat Recovery
Incineration
Air Pollution
Waste-to-Energy
Boiler Operations
Fluidized Bed
Combustion Air
Process Air
Research, Engineering and Testing
Like all Robinson products, AF fans are built with quality materials by skilled, experienced craftsmen for reliability and longevity. This level of quality is a result of ongoing research and testing in Robinsons own lab facilities. Robinson builds prototype fans and tests them for air performance and sound. Finite element stress analysis, computational fluid dynamics (CFD), and resonant frequency testing are other procedures used regularly to help Robinson engineers design in optimum reliability and performance. This, together with extensive field experience, provides Robinson with the information and expertise to engineer fans that satisfy the requirements of individual applications and service conditions.

Performance Capabilities and Features
Robinson AF fans are custom engineered and built to accommodate capacities to over one million cfm and pressure ranges through 90 inches static pressure. Robinson builds AF wheels to 180 inches diameter, custom engineers single and double-inlet arrangements and, where applicable, constructs units of special alloy materials.

Quality Assurance
Robinsons experienced quality control department with in-house expertise in nondestructive testing includes:

Magnetic particle inspection
Ultrasonic testing
Dye-penetrant testing
Radiographic (X-ray) testing
Vibrational resonance testing and modal analysis
Dynamic strain gauge testing
Computer finite element stress analysis
Computational Fluid Dynamics (CFD)
Fan Repair Services - at the factory or in the field
Robinson airfoil fans are backed by excellent field service and convenient repairrebuild centers. The Robinson network is equipped to repair and service air-moving equipment of any type, by any manufacturer.

Robinson repair and rebuild services are cost effective and can provide years of additional service from even the most damaged or out-of-date equipment. Fans ravaged by industrial gases, dust, chemicals or other materials can be restored and improved. Robinson upgrades can transform inefficient fans into high-efficiency equipment that continues to save you money in operational expenses.

Industries Served
Steel
Mining
Cement
Ceramic
Chemical
Woodworking
Industry Applications
Building ventilation
Fume removal
Dust removal
Dust collection
Pneumatic conveying
Oven and dryer exhaust
Combustion air
Incinerators
Heat recovery

ROBINSON BLO BEARINGS FOR ULTIMATE RELIABILITY
Robinson has been manufacturing high-quality fans and blowers since 1892. So naturally, we know a thing or two about the critical components. When performance and reliability demands increase, the need for robust bearings increases as well. Thats why we created Robinson BLO Bearings for high-speed fan applications.

BLO Bearing Features:
Two-bearing unit ensures precision alignment of bearing inserts
Includes two single-row, deep groove ball bearings (Alternate bearing combinations available upon request.)
Higher speed capabilities than separate pillow block housings
Ideal for fans and other overhung rotating equipment
Heavy cast iron construction
Oil lubrication
Shaft size ranges from 65 mm to 100 mm
Complete BLO line acquired from DodgeBaldorABB
Manufactured in the USA
Calpine cannot thank Robinson Fans enough for the upgrade AIG blower fans for our LM6000 Package they have been nothing short of exceptional. Prior to installing the upgraded fan with the oil bath bearing, our service life on the bearings were very short lived (measured in weeks). They were very unreliable and costly to repair. Since we have installed the upgraded fans with the BLO bearing the only maintenance needed is to change the oil every six months and thats it. If there are any doubts on whether the upgrade is worth the money give me a call because it is!

Mike Buchanan, Mechanic
Calpine Corporation, Yuba City Energy Center

INDUSTRIAL DAMPERS FOR HIGH-SPEED FAN EQUIPMENT
Robinson has provided fans and dampers for industry since 1892. In the early years, the company built equipment primarily for coal mine ventilation. In the 1930s, experience in high-temperature applications was acquired as a result of units built for brick-drying operations.

As its customer list has expanded to steel, cement, aluminum, pulp and paper, fertilizer, glass, chemical, coal preparation and utility industries, Robinsons experience and expertise in building dampers have steadily increased. Input from Robinsons field servicemen enables the company to handle the hot, dirty and corrosive jobs as well as high-efficiency, clean-air applications. Today, this experience is available to industry in the form of long-lasting, low-maintenance dampers.

Industrial Dampers are engineered for:
Air performance control
Power savings
System isolationshutdown
High tempdust-laden conditions
Air dilution systems
Low leakage applications
Engineering Design
Robinsons staff of mechanical engineers uses the same technical expertise in the design of custom dampers that is so critical in the design of high-speed rotating fan equipment. Important design considerations include:

Shaft deflection
Torque requirements (for sizing actuator)
Frame stiffness
Bolt sizing and spacing
Bearing selection
Shaft seal design
Low leakage seals (when required)
Material selection
Correct damper design involves use of laboratory test data and years of field experience in addition to textbook engineering and computer-aided calculations.

Laboratory Testing
An AMCA-registered laboratory with prototype fans of nearly every design makes it possible for Robinson to carefully test damper designs. In addition to air performance characteristics and effects on fan performance, prototype testing of damper torque under load is also done at Robinson.

Test setups of new damper designs include cycling tests involving reliability of the actuatorlinkage system. Leakage tests use AMCA design ducts for accurate volume measurement at various pressure drops.

Quality Assurance
Robinsons quality assurance program was developed as a result of involvement with large public utilities over the years. In-house procedures for handling critical dimensions, welding fit-up, weld procedures, etc., are well established.

Nondestructive testing includes magnetic-particle and dye-penetrant inspection expertise as well as in-house X-raying of butt-welds . Hold points for customer witnessing andor inspection can be set up if desired on critical jobs.

Critical path scheduling includes all such quality assurance procedures, which are integrated into the production schedule.

Product Types
Louvered Damper

15% leakage (typical).
Special (1% leakage).
Air-dilution type available.
Parallel blade operation.
Lower efficiency when dampered.
Avoid if large percent run time at very low damper opening (high turn-down).
Good for dirty air stream; no mechanism in air stream.
Opposed blade available for fan outlet side (no HP savings).
Synchronized operation for DWDI available.
Radial Damper

Good dampered efficiency.
Minimizes rotating stall.
Supported center or cantilever design.
Adds to complexity if there are inlet boxes involved.
Good for open inlet, SWSI.
10-15% leakage (typical).
Operating linkage outside air stream.
Vortex Damper

Minimizes rotating stall.
High efficiency in dampered condition.
Mechanism outside air stream.
Straight or conical inlet pieces can be used.
10-15% leakage (typical).
Cannot be used without inlet box.
No need to extend bearing centers for DWDI.
Split design available.
Synchronized operation for DWDI available.
Operating linkage outside air stream.
Variable Inlet Vane (VIV)

Built as a part of the inlet piece.
High efficiency when dampered.
Minimizes rotating stall.
No need to extend bearing centers on DWDI (shaft goes through).
Tapered boxes are possible.
Mechanism in air stream.
Requires cone-shaped inlet piece design.
10-15% leakage (typical).
Robinson Damper Repair and Rebuilding
Complex damper components are often repaired to like-new condition at a fraction of the cost of a new unit. Robinsons experience in fan and damper repair provides an alternate solution to difficult problems.

When equipment fails in service, a plant slowdown or shutdown usually results. Robinsons repair and rebuilding department emphasizes quick turnaround , completing and shipping first-quality repair jobs for on-time delivery. This priority commitment minimizes customer downtime and lost profits.

Primary Industries Served
Steel
Mining
Cement
Ceramic
Chemical
Woodworking
Typical Air-Moving Applications
Building ventilation
Fume removal
Dust removal
Dust collection
Pneumatic conveying
Oven and dryer exhaust
Combustion air
Incinerators
Heat recovery