How to Spec a Conveyor System: An Engineer’s Checklist
Specifying a conveyor system requires systematic documentation of product characteristics, operating environment, performance requirements, and installation constraints. Incomplete specifications lead to equipment that fails to meet operational needs, requires costly modifications, or necessitates complete replacement. This guide presents a structured approach to developing comprehensive conveyor specifications that enable accurate proposals and successful installations.
The Seven-Category Specification Framework
Effective conveyor specifications address seven primary categories. Each category contains specific data points that influence design decisions, component selection, and cost. Gathering this information before requesting proposals ensures manufacturers can provide accurate solutions rather than educated guesses that may not align with your actual requirements.
- Product Characteristics
- Throughput and Speed Requirements
- Layout and Physical Constraints
- Environmental Conditions
- Control and Automation Integration
- Utilities and Infrastructure
- Maintenance and Operational Considerations
Category 1: Product Characteristics
Product dimensions, weight, and physical properties determine belt width, frame strength, motor horsepower, and dozens of other design parameters. Provide complete information for all products the conveyor will handle—not just typical products, but also extremes.
Critical Product Data Points
| Dimensions | Length, width, height (minimum and maximum for each) |
| Weight | Per unit weight and total load on belt at one time |
| Product orientation | How product sits on belt, whether orientation matters |
| Surface characteristics | Rough, smooth, sticky, slippery, fragile, sharp edges |
| Temperature | Product temperature if not ambient |
| Material properties | Abrasive, corrosive, food-contact, chemical compatibility |
| Packaging | Boxes, pallets, loose parts, totes, individual items |
Why Extremes Matter
A conveyor designed for average product may fail when handling maximum-weight or maximum-size items. If your typical carton weighs 15 pounds but occasionally you handle 50-pound cartons, specify 50 pounds as the design load. Belt strength, roller bearings, and motor sizing must accommodate worst-case scenarios, not averages.
Similarly, the smallest product determines belt opening size for wire mesh belts or slat spacing for chain conveyors. A belt perfect for your primary product line may allow small parts to fall through gaps, requiring complete redesign.
Product Stability and Accumulation
Specify whether products accumulate on the conveyor or maintain spacing during transport. Accumulating conveyors require different drive systems, heavier construction, and specialized control logic compared to continuous-transport conveyors. Products that tip easily need guide rails or containment features to prevent falls during transport.
Category 2: Throughput and Speed Requirements
Throughput defines how much product moves through the system per unit time. This fundamental specification determines belt speed, conveyor width, and overall system capacity.
Defining Throughput Correctly
Specify throughput in units that match your operation:
- Units per minute – For discrete parts or packaged products
- Pounds per hour – For bulk materials or mixed product weights
- Linear feet per minute – For continuous materials or closely-spaced products
Include peak throughput requirements, not just average rates. A conveyor sized for average throughput cannot handle peak production periods, creating bottlenecks during high-demand shifts. We typically recommend designing for 20-30% above anticipated peak throughput to provide operational margin and accommodate future growth.
Speed Calculations and Belt Selection
Belt speed depends on product spacing and throughput requirements. For example, transporting 60 cartons per minute with 12-inch spacing between cartons requires 60 feet per minute belt speed (60 cartons × 12 inches = 720 inches = 60 feet). Add safety margin and round up to standard motor speeds.
Very high speeds (above 300 feet per minute) create product stability challenges and noise issues. Very low speeds (below 20 feet per minute) require specialized gear reducers or drive systems. Most industrial conveyors operate between 40 and 200 feet per minute—speeds that balance productivity with mechanical practicality.
Cycle Time and Dwell Time
For process conveyors where products remain on the belt for specific durations—such as cooling, drying, or assembly—specify required dwell time. A curing oven requiring 10-minute dwell time with continuous product flow needs a conveyor long enough to contain 10 minutes of production. This directly determines conveyor length, which affects building space requirements and cost.
Category 3: Layout and Physical Constraints
Available floor space, ceiling height, and existing equipment locations define the physical envelope within which the conveyor must fit. Detailed layout information prevents designs that cannot be installed in your facility.
Dimensional Documentation
Provide the following measurements:
- Available floor space (length and width)
- Overhead clearance (minimum height to obstructions)
- Required transfer heights at load and discharge points
- Column locations, wall offsets, and other obstacles
- Door openings if conveyor must be brought in as complete sections
- Floor load capacity (pounds per square foot)
A dimensioned floor plan—even a rough sketch with measurements—communicates spatial constraints far more effectively than verbal descriptions. Photographs help manufacturers understand the installation environment and identify potential interference issues.
Access Requirements
Conveyors require access for maintenance. Technicians must reach motors, gearboxes, and belt tensioning devices without dismantling adjacent equipment. Specify minimum clearances you can provide on each side of the conveyor. If space is severely limited, manufacturers can design access panels, removable sections, or other features that enable maintenance in tight quarters.
Expansion and Reconfiguration
If future expansion is anticipated, specify this during initial design. Conveyors can be designed with mounting provisions, electrical capacity, and structural strength that accommodate future additions without requiring replacement of installed equipment. This approach costs slightly more initially but prevents expensive retrofits later.
Category 4: Environmental Conditions
Operating environment directly affects material selection, component ratings, and protective features. Conveyors for climate-controlled facilities differ fundamentally from those exposed to weather, chemicals, or extreme temperatures.
Temperature Range
Specify minimum and maximum ambient temperatures. Standard conveyors function reliably from 40°F to 120°F. Outdoor installations in cold climates may require heated bearing compartments or special greases that remain fluid at low temperatures. High-temperature environments require materials and components covered in our separate article on high-temperature conveyors.
Moisture and Washdown
Food processing and pharmaceutical facilities often require washdown capability. Specify whether the conveyor will be cleaned with water spray, detergents, or sanitizing chemicals. Washdown-rated conveyors use stainless steel construction, sealed bearings, and electrical components rated for wet environments (typically NEMA 4X enclosures).
Even light moisture exposure requires consideration. Conveyors in humid environments benefit from corrosion-resistant coatings or stainless fasteners that prevent rust formation over extended service life.
Dust, Debris, and Contamination
Dusty environments—such as woodworking, grain handling, or metalworking facilities—require sealed bearings and totally-enclosed motors that prevent dust intrusion. Explosive dust environments require conveyors rated for Class II, Division 1 or Division 2 hazardous locations, using spark-resistant materials and explosion-proof motors.
Cleanroom applications require the opposite approach: conveyors must not generate particles that contaminate the environment. Specify cleanroom classification (Class 10, Class 100, etc.) so manufacturers can select appropriate materials and designs.
Category 5: Control and Automation Integration
Modern conveyors integrate with facility control systems, safety circuits, and upstream/downstream equipment. Control requirements significantly impact system cost and complexity.
Basic Control Requirements
At minimum, specify:
- Start/stop method (local push button, remote signal, automatic)
- Speed control needs (constant speed vs. variable speed)
- Safety device requirements (emergency stops, light curtains, pull cords)
- Status indication (running lights, fault alarms)
Simple on/off control costs far less than variable speed drives with PLC integration. If your application functions adequately with basic control, avoid over-specifying complex systems that add cost without operational benefit.
PLC and Network Integration
For automated facilities, specify:
- PLC brand and model currently used
- Communication protocol (Ethernet/IP, Modbus, Profinet)
- Required data points (speed, current, runtime hours, fault codes)
- Interlock requirements with other equipment
Manufacturers can provide conveyors with control panels that integrate seamlessly with existing systems or supply standalone panels if existing PLC capacity is limited. Clarifying these requirements early prevents incompatibility issues during installation.
Sensing and Feedback
Specify any product detection, counting, or tracking requirements. Photoelectric sensors detect product presence. Encoders provide accurate speed feedback. Load cells measure product weight during transport. Each sensing requirement adds components and wiring that affect system design and cost.
Category 6: Utilities and Infrastructure
Electrical service, compressed air availability, and other utilities must be identified before design begins. Mismatched utility requirements cause expensive field modifications during installation.
Electrical Specifications
Document available electrical service:
- Voltage (208V, 240V, 480V, 600V)
- Phase (single-phase or three-phase)
- Frequency (60 Hz standard in North America)
- Available amperage
- Distance from electrical panel to conveyor location
Most industrial conveyors use 480V three-phase power for efficiency and motor availability. Smaller conveyors may operate on 208V or 240V. If only single-phase power is available, this limits motor selection and may increase cost. Specifying electrical service correctly ensures motors and controls match your facility infrastructure.
Compressed Air
Pneumatic systems for product diversion, elevation, or braking require compressed air supply. Specify available pressure (typically 90 PSI in industrial facilities) and volume. Some applications require instrument air with specific cleanliness ratings—specify if your application has such requirements.
Installation Responsibilities
Clarify which utility connections the conveyor supplier provides versus customer-installed infrastructure. Typically, conveyor manufacturers provide equipment through the disconnect switch, while customers provide electrical service to that disconnect. However, practices vary, so explicit specification prevents misunderstandings about scope of supply.
Category 7: Maintenance and Operational Considerations
Design decisions that simplify maintenance reduce lifetime operating costs substantially. Specifying maintenance requirements during initial design yields equipment optimized for your operational practices.
Maintenance Access and Serviceability
Indicate whether your maintenance team has specialized tools or skills. Conveyors can be designed with quick-change belt systems, externally adjustable tension devices, and other features that simplify maintenance but add initial cost. For facilities with limited maintenance capability, these features prove worthwhile. For facilities with skilled millwrights and complete machine shops, simpler designs may suffice.
Spare Parts and Standardization
If you operate multiple conveyors, standardizing components simplifies spare parts inventory. Specify preferred motor brands, bearing types, or control components if you have existing inventory you wish to leverage. Manufacturers can often accommodate these preferences without significant cost impact.
Service Life Expectations
A conveyor designed for 10-year service life differs from one intended for 3-year use during a temporary production campaign. Longer service life requires heavier construction, premium bearings, and oversized components that cost more initially but reduce replacement frequency. Short-term applications may justify lighter construction that minimizes upfront investment.
Duty cycle also matters. Conveyors operating 24/7 require more robust design than those running single shifts. Specify operating hours per day and days per week so manufacturers can select components rated for your duty cycle.
Comprehensive Specification Checklist
Use this checklist when preparing conveyor specifications. Not every item applies to every application, but reviewing each category ensures nothing critical is overlooked.
Product Information
- ☐ Minimum and maximum dimensions (L × W × H)
- ☐ Minimum and maximum weight per unit
- ☐ Product orientation and stability
- ☐ Surface characteristics and fragility
- ☐ Product temperature if not ambient
- ☐ Material compatibility requirements
- ☐ Packaging type
Performance Requirements
- ☐ Required throughput (units/min or lbs/hr)
- ☐ Peak vs. average throughput
- ☐ Belt speed or dwell time requirements
- ☐ Accumulation vs. continuous transport
- ☐ Product spacing requirements
Physical Layout
- ☐ Available floor space (length × width)
- ☐ Overhead clearance
- ☐ Transfer heights (loading and discharge)
- ☐ Obstacles, columns, or interferences
- ☐ Floor load capacity
- ☐ Access requirements for installation
- ☐ Maintenance clearance needs
Environmental Conditions
- ☐ Minimum and maximum temperatures
- ☐ Indoor vs. outdoor installation
- ☐ Moisture or washdown requirements
- ☐ Dust, debris, or contamination concerns
- ☐ Chemical exposure
- ☐ Cleanroom or hazardous location rating
Control and Integration
- ☐ Start/stop control method
- ☐ Variable speed requirements
- ☐ PLC brand and communication protocol
- ☐ Required sensors and feedback devices
- ☐ Safety device requirements
- ☐ Interlock requirements with other equipment
Utilities
- ☐ Available electrical voltage and phase
- ☐ Distance to electrical panel
- ☐ Compressed air pressure and volume
- ☐ Installation responsibility clarification
Operational Factors
- ☐ Duty cycle (hours/day, days/week)
- ☐ Expected service life
- ☐ Maintenance capability and access
- ☐ Spare parts standardization preferences
- ☐ Budget constraints or cost targets
- ☐ Timeline requirements
Common Specification Mistakes to Avoid
Mistake #1: Specifying Only Average Conditions
Designing for average product weight, average throughput, and typical conditions creates systems that fail when handling maximum loads or operating under worst-case scenarios. Always specify maximums, not averages.
Mistake #2: Incomplete Dimensional Information
Stating “about 20 feet long” forces manufacturers to guess. Provide exact available space, transfer heights measured from floor to centerline, and clearances to obstacles. Dimensional errors discovered during installation require expensive field modifications or equipment replacement.
Mistake #3: Assuming Standard Control Compatibility
Not all PLCs communicate using the same protocols. Verify your facility’s communication standard before specifying control integration. Incompatible protocols require protocol converters or control panel redesign, adding cost and complexity.
Mistake #4: Overlooking Future Requirements
Production requirements change. Product lines expand. Throughput increases. Designing conveyors with modest expansion capability costs little initially but prevents premature obsolescence. Consider specifying motors and frames sized for 25-30% above current requirements.
Mistake #5: Neglecting Maintenance Accessibility
Conveyors installed against walls or between equipment banks may be impossible to service without disassembling adjacent systems. Specify access requirements during design so manufacturers can incorporate appropriate service panels, removable guards, or clearances.
Working with Conveyor Manufacturers
Complete specifications enable accurate proposals, but the best results come from collaborative relationships with manufacturers who understand your application and operational constraints.
The Application Review Process
At Custom Conveyor & Equipment Corporation, we review specifications with customers to clarify requirements, identify potential issues, and explore alternative approaches that may improve performance or reduce cost. This application review often reveals specification areas that need refinement or alternative solutions that better meet operational needs.
For example, a customer may specify a 50-foot conveyor to achieve required dwell time, but discussion reveals that an 80-foot conveyor operating at higher speed would provide the same dwell time while allowing future throughput increases without replacing equipment. These insights emerge from dialogue between customer and manufacturer.
Prototype Testing and Validation
For critical applications or unusual products, consider requesting prototype testing before committing to full system purchase. Testing actual products on sample conveyor sections verifies belt selection, speed calculations, and transfer geometry. The cost of prototype testing is minimal compared to the expense of correcting design errors after installation.
From Specification to Solution
Comprehensive conveyor specifications enable manufacturers to design systems that meet operational requirements without guesswork. The time invested in documenting product characteristics, environmental conditions, and performance expectations pays dividends through equipment that functions as intended from day one.
Custom Conveyor & Equipment Corporation has manufactured conveyor systems in Cedar Rapids, Iowa since 1984. Our engineering process—Define Your Need, Engineer A Solution, Deliver For You—begins with thorough understanding of your specifications and application requirements.
Our manufacturing capabilities support diverse conveyor designs across a wide range of applications. We fabricate frames from our 3kW fiber laser cutting system with 6’×12′ capacity, form structural components on our 300-ton press brake with 12-foot bed, and weld carbon steel, stainless steel, and aluminum using processes appropriate for each material. We build products ranging from 6 grams to 6 tons per unit, applying the same engineering rigor to small specialty conveyors as to large industrial systems.
