The Contractor Reality
Contractors perform 15-30% of maintenance work in a typical industrial plant. For turnarounds and major overhauls, that number can exceed 80%. Specialty services — vibration analysis, laser alignment, infrared surveys, motor testing, valve repair, and machining — are often outsourced entirely. Whether you’re using contractors for routine support or specialized expertise, the quality of their work directly impacts your equipment reliability.
Bad contractor work doesn’t just cost money for the initial repair. It causes rework, premature failures, and consequential damage that multiplies the original cost. A pump that’s misaligned during a contractor-performed rebuild will destroy its bearings and seals in months, creating a second repair event that shouldn’t have happened.
Selecting the Right Contractors
Technical Qualification
Evaluate contractor technical capability before they start work, not after they’ve damaged equipment. For mechanical work, verify:
- Experience with your specific equipment types and sizes
- Craft certifications (welding to ASME standards, rigging certification, confined space training)
- Tool and equipment capabilities (do they have their own laser alignment tools, torque wrenches, and lifting equipment, or will they use yours?)
- References from similar industrial facilities — not just a reference list, but actually call them and ask specific questions about quality and timeliness
For PdM services (vibration analysis, oil analysis, thermography, motor testing), verify:
- Analyst certifications (ISO 18436 for vibration, ASNT for thermography, at the appropriate category level for the work scope)
- Equipment calibration records
- Report quality — ask for sample reports from previous clients. A good PdM report includes clear findings, supporting data (spectra, thermal images, trend plots), severity assessment, and actionable recommendations. A poor report lists numbers without interpretation.
- Turnaround time — reports delivered weeks after data collection lose much of their value for detecting fast-moving failures
Safety Qualification
Review the contractor’s safety record (EMR — Experience Modification Rate — and TRIR — Total Recordable Incident Rate). An EMR above 1.0 means worse-than-average safety performance in their industry classification. TRIR benchmarks vary by industry — compare against current Bureau of Labor Statistics rates for their NAICS code.
Verify that the contractor has a written safety program, conducts regular toolbox talks, and provides appropriate PPE for their workers. A contractor with poor safety practices creates liability for your facility and is likely to cut other corners as well.
Defining the Work Scope
Vague work scopes produce vague results. Every contractor work order or service agreement should specify:
What’s Included
- Specific tasks to be performed (not just “overhaul pump” but “remove pump, disassemble, inspect and measure all internal clearances per API 610 Table 4, replace wear rings to original clearances, replace bearings, replace mechanical seal with OEM parts, reassemble per OEM torque specifications, perform laser alignment to within 0.002″ offset and 0.001″/inch angularity, verify rotation and flow before turnover”)
- Deliverables (alignment reports, torque records, dimensional inspection data, as-found/as-left documentation)
- Standards and procedures to follow (API, ASME, OEM procedures, your site-specific procedures)
- Acceptance criteria (vibration limits after repair, alignment tolerances, leak test requirements)
What’s Not Included
Define the boundaries of the work scope explicitly. Who provides parts? Who provides scaffolding and lifting equipment? Who is responsible for electrical isolation and lockout? Who handles disposal of used oil and parts? Ambiguity in scope boundaries causes delays when the contractor encounters work they didn’t plan for and disputes over additional charges.
Documentation Requirements
Specify what documentation the contractor must provide and when. As-found condition reports, dimensional measurements, torque records, alignment data, and test results should be submitted before the job is considered complete. This documentation becomes part of the equipment history file and supports future maintenance decisions.
Field Oversight: Trust but Verify
Hiring a qualified contractor doesn’t eliminate the need for oversight. Your maintenance supervisor or reliability engineer should be involved at key points during the work.
Pre-Job
- Review the scope with the contractor supervisor. Ensure mutual understanding of what’s expected.
- Walk the job site together. Identify safety hazards, access requirements, and logistics.
- Verify the contractor has the correct parts, tools, and procedures before they begin disassembly.
In-Progress
- Inspect as-found conditions before new parts are installed. This is your chance to identify root causes of the failure — was the bearing contaminated? Was the impeller eroded? Were the fits out of tolerance?
- Verify critical assembly steps — bearing installation method, torque sequences, seal setting, and alignment. These are the steps where mistakes have the highest consequence.
- Don’t hover — that’s counterproductive. Focus your oversight on the hold points where quality matters most.
Acceptance
Before signing off on the work and releasing the contractor:
- Review all required documentation (alignment report, torque records, inspection data)
- Verify post-repair vibration readings meet acceptance criteria
- Run the equipment under normal operating conditions and verify performance (flow, pressure, temperature, current draw)
- Conduct a walkdown to confirm housekeeping, guard installation, and removal of all contractor tools and materials
A formal acceptance process prevents the common problem of discovering poor work quality days or weeks after the contractor has left the site. By then, getting the contractor back for warranty repair is difficult and time-consuming.
Performance Measurement
Track contractor performance over time with objective metrics:
- Rework rate — Percentage of contractor jobs that require rework within 90 days. Target: less than 5%. Anything above 10% indicates a quality problem that needs to be addressed.
- Schedule adherence — Did the contractor complete the work within the agreed timeframe? Track the percentage of jobs completed on time. Chronic schedule overruns indicate either poor contractor planning or inadequate scope definition.
- Safety incidents — Any recordable incident, near-miss, or safety rule violation by contractor personnel should be documented and reviewed.
- Documentation compliance — Did the contractor provide all required documentation in acceptable quality and timeliness?
- Cost variance — For time-and-materials contracts, how does actual cost compare to the estimate? Consistent overruns suggest either poor estimating or scope creep during execution.
Review these metrics quarterly. Share the results with your contractor partners. Good contractors want to know how they’re performing and will respond to constructive feedback. Poor performers who don’t improve should be replaced — the cost of repeatedly fixing bad work exceeds the cost of finding a better contractor.
Long-Term Relationships vs. Low-Bid Procurement
The lowest hourly rate rarely delivers the lowest total cost. A contractor charging $85/hour who completes work correctly the first time costs less than a contractor charging $65/hour whose work requires rework, causes premature failures, and extends job durations.
Long-term relationships with qualified contractors provide several advantages. The contractor learns your equipment, procedures, and expectations over time — reducing the learning curve on each job. You develop a track record that supports fair pricing negotiations based on demonstrated performance. Preferred contractor arrangements with guaranteed availability ensure you can get competent resources when you need them, including during peak demand periods like turnarounds.
This doesn’t mean sole-sourcing everything. Maintain relationships with 2-3 qualified contractors for major service categories. Competition keeps pricing honest. But bid every job to the lowest price regardless of quality history, and you’ll get exactly what you paid for — cheap work that costs more in the long run.
The Contractor Management Payoff
Plants that invest in contractor selection, scope definition, field oversight, and performance tracking see measurable improvements in contractor work quality. Rework rates drop, equipment reliability after contractor-performed maintenance improves, and total contractor spending decreases even as the quality of service increases. The investment is management time and attention — structuring the relationship so that contractors are set up to succeed and held accountable for results. That investment pays dividends in equipment reliability that compound over every repair cycle.