Paint Shop Planning—From Floor Plan to First Spray | Article 17 of 28
Writing an Equipment Specification Vendors Can Quote
If it is not written into the specification, do not be surprised when it is missing from the proposal.
A paint-shop equipment specification turns the owner’s requirements into instructions that vendors can understand, price, and contractually commit to deliver.
A weak specification asks for “a paint booth large enough for our parts.” A strong specification defines the parts, production rate, coating process, airflow, utilities, construction, controls, documentation, training, installation responsibilities, testing, and acceptance requirements.
When vendors receive incomplete information, they must make assumptions. One may include freight while another excludes it. One may include installation and startup while another quotes equipment only. One may provide a complete air-makeup system while another assumes the building HVAC will supply replacement air.
The prices may look easy to compare, but the vendors may be quoting entirely different projects.
The workman’s rule: A short specification does not eliminate project details. It merely postpones them until they become change orders.
1. Begin With the Owner’s Project Requirements
The equipment specification should be based on the Owner’s Project Requirements developed earlier in the planning process. Those requirements explain what the finishing system must accomplish.
Before writing the specification, confirm:
- Products and maximum part dimensions
- Part materials and weights
- Production rate and shift schedule
- Liquid or powder coating technology
- Required finish quality
- Color-change frequency
- Manual or automatic application
- Surface-preparation requirements
- Flash-off, drying, and curing requirements
- Available floor space and building height
- Available electrical, gas, compressed-air, and water utilities
- Environmental and permitting requirements
- Maintenance capabilities
- Expected future production
If these items are unknown, the owner is not ready to request a firm equipment quotation.
2. Describe the Project Clearly
Begin the specification with a plain-language project summary. Tell vendors what is being built and why.
Example project-summary information
- Facility location
- New construction or renovation
- Automotive, industrial, aerospace, wood, or other finishing operation
- Primary products being finished
- Current and future production requirements
- Coating technologies being considered
- Major equipment included in the project
- Target installation and production dates
- Special site limitations
A vendor should understand the basic project before reaching the technical requirements.
3. Define the Scope of Supply
The specification must state exactly what equipment the vendor is expected to furnish.
The scope may include:
- Spray booth or preparation station
- Air-makeup unit
- Exhaust fan and ductwork
- Filters and filter-monitoring equipment
- Booth lighting
- Control panel and operator interface
- Heated spray or cure system
- Flash-off enclosure
- Batch or continuous oven
- Mix room
- Paint kitchen or coating-delivery system
- Application equipment
- Conveyor or material handling
- Fire-protection equipment
- Installation supervision
- Startup and commissioning
- Operator and maintenance training
- Spare parts and initial consumables
Separate required equipment from optional equipment. Ask vendors to price options individually so the owner can evaluate them without requesting another complete proposal.
4. Define the Products and Production Rate
The vendor needs representative product data—not just the largest overall dimension.
Provide:
- Maximum length, width, and height
- Minimum and maximum product weight
- Part material and thickness
- Part geometry and enclosed cavities
- Largest production part
- Heaviest production part
- Smallest high-volume part
- Required parts per hour or loads per shift
- Expected rack or carrier arrangement
- Loading and unloading method
- Current and future shift schedule
Include drawings and photographs when possible. A long hollow structure, a dense casting, and a flat panel may fit inside the same dimensional envelope but create very different airflow, handling, and curing requirements.
5. Identify the Coatings and Process Materials
Equipment design depends on what will be sprayed, mixed, pumped, heated, collected, and cleaned.
Provide the vendor with:
- Coating manufacturer and product name
- Safety data sheets
- Technical data sheets
- Mixing ratio
- Application viscosity
- Solids content
- Solvent or water content
- Required film thickness
- Pot life
- Flash and cure schedule
- Cleaning materials
- Maximum hourly coating usage
- Color range and change frequency
If the exact coating has not been selected, define the range of materials the system must accommodate and require the vendor to state all design assumptions.
6. State the Required Finish Quality
“Good finish” is not a measurable requirement. Define how the finished product will be evaluated.
Depending on the operation, requirements may include:
- Dry-film-thickness range
- Color tolerance
- Gloss range
- Adhesion requirement
- Coverage in recessed areas
- Maximum allowable dirt or defects
- Corrosion-performance requirement
- Cure verification
- Appearance-panel approval
- Customer or industry specification
Equipment alone cannot guarantee finish quality. Parts, pretreatment, coating, environment, application technique, maintenance, and operator training also affect the result. However, the equipment must be capable of supporting the specified process.
7. Specify the Required Operating Envelope
Equipment should perform throughout the stated range of production conditions—not only at one ideal operating point.
Minimum condition
Small load, low production rate, cold startup, or minimum spray demand.
Normal condition
The expected day-to-day production load and operating schedule.
Maximum condition
Heaviest product, peak production, maximum coating use, or severe seasonal condition.
Future condition
Planned expansion, additional shift, new product, or increased automation.
Require vendors to identify any condition the proposed equipment cannot support.
8. Define Dimensional and Access Requirements
State both internal working dimensions and maximum external equipment dimensions. Include required service clearances.
Document:
- Usable internal length, width, and height
- Door width and height
- Personnel-door locations
- Product entry and exit arrangement
- Floor, pit, or raised-platform requirements
- Roof and wall penetrations
- Maximum equipment height
- Required maintenance access
- Filter-removal clearance
- Motor and fan-removal space
- Clearance from building structure
- Required aisles and exits
The proposal drawing should show the equipment inside the owner’s building layout—not floating alone on a blank page.
9. Specify Airflow and Ventilation Performance
State the required booth airflow arrangement and performance without prescribing an unverified fan size.
Requirements may address:
- Crossdraft, semi-downdraft, side-downdraft, or downdraft airflow
- Required operating airflow or velocity
- Method and locations used for field measurement
- Clean-filter operating point
- Loaded-filter operating point
- Allowable booth-pressure range
- Exhaust-stack arrangement
- Replacement-air volume
- Temperature-control range
- Filter efficiency and construction
- Airflow alarms and interlocks
Require the vendor to state fan airflow, calculated static pressure, motor horsepower, filter pressure drop, and the performance point used for equipment selection.
10. Specify Heating and Cure Performance
Heated systems should be specified around the product and coating—not merely the maximum oven-air temperature.
Define:
- Minimum and maximum product load
- Starting part temperature
- Required part-metal temperature
- Required time at temperature
- Maximum allowable part temperature
- Production rate or conveyor speed
- Maximum volatile load
- Allowable temperature variation
- Heat source
- Product-profiling requirements
- Cooling requirements
State how cure performance will be demonstrated during acceptance testing.
11. Define Every Available Utility
Vendors should not be left to guess what utilities are available at the site.
Utility information
- Electrical voltage, phase, frequency, and available capacity
- Natural-gas pressure and available volume
- Compressed-air pressure, quality, and available flow
- Process-water quality, pressure, and flow
- Sanitary and industrial-waste connections
- Fire-protection water availability
- Communication and data-network requirements
- Outdoor winter and summer design conditions
Require the vendor to provide final utility consumption and connection requirements with the proposal.
12. State Applicable Codes and Approvals
Identify the project location and require compliance with the locally adopted code editions, permit requirements, equipment listings, and decisions of the Authority Having Jurisdiction.
Depending on the project, applicable requirements may involve:
- Building code
- Fire code
- Mechanical code
- Fuel-gas code
- Electrical code
- Plumbing code
- Environmental regulations
- Occupational safety requirements
- NFPA standards
- Equipment listing requirements
- Property-insurer requirements
Avoid the vague statement “equipment shall meet all applicable codes” as the only compliance requirement. Identify known requirements and require the vendor to list the standards, editions, approvals, and assumptions included in the proposal.
13. Define the Control Sequence
The equipment specification should include a written sequence explaining how the system starts, operates, changes modes, responds to faults, shuts down, and restarts.
Address:
- Normal startup
- Ventilation proving
- Spray-equipment enabling
- Flash, bake, cure, and cooling modes
- Conveyor operation
- Filter and pressure alarms
- Fan or airflow failure
- Burner failure
- Emergency-stop operation
- Fire-system activation
- Power failure and restoration
- Manual and automatic reset
Require the vendor to identify any deviation from the owner’s requested sequence.
14. Establish a Responsibility Matrix
A responsibility matrix lists each project task and identifies who will furnish, install, connect, test, and approve it.
Furnish
Who purchases and delivers the equipment or material?
Install
Who unloads, assembles, mounts, and supports it?
Connect
Who supplies final wiring, piping, controls, ducts, and utilities?
Test and approve
Who starts, verifies, witnesses, documents, and accepts it?
Include responsibility for:
- Permits and plan review
- Freight and unloading
- Foundations and pits
- Roof and wall penetrations
- Structural steel and supports
- Equipment assembly
- Electrical feeders and controls
- Gas and compressed-air piping
- Exhaust ductwork
- Fire protection
- System startup
- Testing and balancing
- Training and documentation
If responsibility is assigned to “others,” identify those others by name or contract package.
15. Require Vendors to List Exclusions
Every proposal should contain a specific exclusions section. Require vendors to list everything not included in their price.
Common exclusions include:
- Freight
- Taxes
- Permits
- Unloading and rigging
- Installation labor
- Roof work
- Foundations and pits
- Utility service upgrades
- Final electrical and gas connections
- Fire-suppression equipment
- Testing and balancing
- Travel and lodging
- Startup and training
- Consumables and filters
An exclusion is not automatically unreasonable. The problem is an exclusion that is discovered after the purchase order is issued.
16. Require a Line-Item Price Breakdown
A single lump-sum price makes proposal comparison and later changes difficult. Request separate pricing for major equipment, installation, startup, training, freight, options, and recommended spare parts.
The breakdown should include:
- Base equipment
- Each major subsystem
- Required accessories
- Optional features
- Installation
- Freight and delivery
- Permits and engineering
- Startup and commissioning
- Training
- Initial filters and consumables
- Recommended spare parts
- Taxes, if applicable
Require vendors to identify estimated pricing, allowances, and items subject to later adjustment.
17. Define the Required Proposal Format
Give every vendor the same response format. This reduces the chance that important information is buried in sales literature.
Required proposal sections
- Executive summary
- Scope of supply
- Equipment description
- Performance data
- Utility requirements
- Codes, listings, and approvals
- Control sequence
- Preliminary layout drawing
- Responsibility matrix
- Project schedule
- Itemized pricing
- Options and alternates
- Deviations and exceptions
- Exclusions
- Warranty and service
- Payment terms and proposal validity
18. Control Alternates and Substitutions
Vendors may have better or more economical ways to achieve the project goals. Allow alternates, but require the vendor to quote the specified base design first.
An alternate should explain:
- Exactly what changes
- Why the vendor recommends it
- Price difference
- Schedule difference
- Performance effect
- Utility effect
- Maintenance effect
- Code or approval effect
- Any change to warranty or responsibility
This preserves a common comparison while allowing useful vendor expertise to improve the project.
19. Require Submittals Before Fabrication
The purchase order should identify documents the owner must review before the vendor releases equipment for fabrication.
Required submittals may include:
- General arrangement drawings
- Equipment dimensions and weights
- Foundation and pit drawings
- Structural loads and support details
- Utility connection schedule
- Electrical load schedule
- Control-system drawings
- Sequence of operation
- Airflow and fan-performance data
- Filter data
- Burner and fuel-train information
- Equipment listings and certifications
- Recommended spare-parts list
- Installation schedule
Owner review should confirm coordination with the specification. It should not transfer the vendor’s design responsibility to the owner.
20. Define Factory and Field Testing
State which functions must be tested before shipment and which must be demonstrated after installation.
Factory testing may include:
- Control-panel inspection
- Input and output simulation
- Software and alarm review
- Motor and component verification
- Dimensional inspection
- Equipment labeling
Field testing may include:
- Airflow measurement and balancing
- Building and booth pressure verification
- Temperature-uniformity testing
- Product-temperature profiling
- Alarm and interlock testing
- Fire-system interface testing
- Emergency-stop testing
- Production demonstration
- Finish-quality verification
21. Write Measurable Acceptance Criteria
The specification should explain what the equipment must demonstrate before final acceptance and payment.
Acceptance criteria should be:
- Specific: The requirement is clearly stated.
- Measurable: It can be tested or inspected.
- Achievable: It reflects a realistic process.
- Documented: The result is recorded.
- Assigned: The responsible testing party is identified.
Examples include required airflow, allowable pressure range, maximum temperature variation, parts per hour, cure profile, alarm response, utility consumption, noise limit, or demonstrated finish quality on representative parts.
Do not make final payment or sign final acceptance merely because the equipment has been delivered and can be turned on. Acceptance should follow completion of testing, corrections, training, and documentation.
22. Define Training Requirements
“Training included” is too vague. State who will be trained, what will be covered, how long the training will last, and what materials will be provided.
Training should address:
- Normal startup and shutdown
- Operating modes
- Safety systems and emergency response
- Alarm recognition and approved reset procedures
- Filter and routine maintenance
- Burner and ventilation checks
- Application-equipment operation
- Process-control limits
- Lockout/tagout awareness
- Troubleshooting boundaries
- Required inspection records
Operators and maintenance personnel may require separate training sessions because their responsibilities are different.
23. Define the Required Final Documentation
Final documents are part of the equipment—not optional paperwork.
- Final as-built drawings
- Electrical schematics and panel schedules
- Control-program backups
- Sequence of operation
- Operating and maintenance manuals
- Component data sheets
- Replacement-parts lists
- Lubrication and maintenance schedules
- Equipment listings and certifications
- Startup and commissioning reports
- Air-balance and temperature-profile reports
- Warranty certificates
- Training records
- Vendor service contacts
Specify paper and electronic formats. Require the final electronic files and control backups before the project is closed.
24. Address Warranty and Service Support
The specification should define when the warranty begins, what it covers, who provides service, and how warranty problems are reported.
Ask vendors to state:
- Warranty duration
- Whether the warranty begins at shipment, startup, or acceptance
- Parts and labor coverage
- Travel coverage
- Response time
- Remote-support availability
- Local service capability
- Excluded components and consumables
- Required owner maintenance
- Extended-warranty options
A long warranty has limited value if qualified service and replacement parts are not available when production stops.
25. Issue One Addendum to Every Bidder
Vendors will ask questions. Record each material clarification and send the same answer to every bidder through a numbered addendum.
This keeps one vendor from pricing different information than another and creates a permanent record of changes to the original specification.
Require vendors to acknowledge every addendum in their proposals.
Questions to Ask Before Releasing the Specification
- Can every vendor identify exactly what equipment is required?
- Are product dimensions, weights, materials, and production rates documented?
- Are coating and cure requirements included?
- Are available utilities verified?
- Are responsibilities for permits, installation, connections, and testing assigned?
- Must vendors list exclusions, deviations, and assumptions?
- Is a common proposal format required?
- Are field-performance tests defined?
- Are acceptance criteria measurable?
- Are training, documentation, warranty, and service requirements included?
Knowledge Check
- Why do incomplete specifications produce proposals that are difficult to compare?
- What information belongs in a responsibility matrix?
- Why should vendors list exclusions and deviations?
- What is the purpose of an operating envelope?
- Why should acceptance criteria be measurable?
- What documents should be received before final project closeout?
Planning and contractual notice: This article provides general educational information and is not an engineering specification, construction contract, legal opinion, or code interpretation. Project specifications should be prepared and reviewed by qualified engineers, legal or contracting professionals, equipment specialists, and the owner’s project team. Requirements must reflect the actual process, equipment listings, locally adopted codes, permit conditions, insurer requirements, and decisions of the Authority Having Jurisdiction.
Next in the series: Article 18 of 28—How to Compare Paint-Booth Proposals
Three vendors can answer the same request with three different equipment packages, scopes, and assumptions. Article 18 explains how to level the proposals, identify missing costs, evaluate exceptions, compare long-term value, and avoid selecting a low bid that becomes an expensive project.
