Blade Inspection Robot Cost: A Budget Framework

Define the inspection unit first

A price “per inspection” is ambiguous. It could mean one cavity, one blade, three blades on one turbine or a visit that includes several methods. Choose one unit and specify what makes it complete.

For example, your contractual unit could be one blade with specified internal areas captured, exclusions documented and a reviewed report accepted. That is a proposed scope definition, not a claim about what a particular robot can deliver. What “accepted” should mean is set out inwhat a blade inspection report should include.

Keep exterior inspection, additional nondestructive testing, engineering assessment and repair outside that unit unless explicitly included. Otherwise, two bids can look comparable while delivering different evidence.

Separate the purchase package from annual costs

Ask suppliers to itemize the proposed configuration and exclusions. TheWIT-BR60 product page specifically directs buyers to confirm included equipment, accessories, responsibilities, records and delivery arrangements in the quotation. A published specification does not define a complete supply package.

Use the following budget worksheet to organize quotes and internal estimates.

Treat recoverable taxes consistently with your finance policy. Record currency, quotation validity and payment milestones rather than mixing estimates from different commercial bases.

Build an annualised planning model

Let:

• A = installed acquisition cost, including initial deployment
• S = assumed residual value at the end of the planning life
• L = planning life in years
• T₀ = initial training cost, including trainee time
• Lₜ = years over which initial training is allocated
• F = other annual fixed costs, including recurring training, software and scheduled support
• N = accepted inspection units delivered per year
• V = average variable operating cost per accepted unit

Then a simple annual cost allocation is:

Annual fixed allocation = (A − S) / L + T₀ / Lₜ + F

Direct cost per accepted unit = annual fixed allocation / N + V

This is a management-planning model. It is not a tax-depreciation calculation, cash-flow forecast or financing valuation. Validate useful life, residual value and allocation periods with your finance team. If ownership financing is relevant, model its treatment separately and avoid counting the same capital cost twice.

Build V from field labor, allocated mobilization, travel, consumables, variable maintenance, reporting labor and usage-based fees. Allocate shared trip costs consistently. Include unsuccessful visits and rework in the budget; do not hide them by counting only successful capture time.

Budget for training beyond the controls

Operator familiarization and competent field execution are different budget items. Depending on the task, teams may need instruction in setup, insertion and recovery, image-quality checks, location recording, equipment care and abnormal-condition response. Reporting personnel need the agreed classification and escalation workflow.

Existing site-access and safety requirements still apply.OSHA’s wind-energy lockout/tagout guidance identifies hazardous-energy control as a requirement for relevant servicing and maintenance activities in the United States. Budget for the applicable local and site procedures; robot training does not replace them. The deployment and recovery planning guide sets out who approves what.

Ask whether refresher instruction, replacement operators and supervised initial deployments are included. Staff turnover can make recurring training a meaningful annual expense.

Model downtime separately and carefully

A robot’s capture duration is not the turbine’s total outage. Planning may also involve access, isolation, positioning, insertion, recovery, checks and authorized return to service.

The WIT-BR60 page publishes a 70 m run in no more than 60 minutes for one cavity under its stated setup and unobstructed-path conditions. That is not an end-to-end turbine inspection duration or a universal scheduling allowance.

For an economic scenario, define:

Downtime impact = incremental unavailable hours × expected counterfactual average power × net energy value

Use hours, megawatts and currency per megawatt-hour consistently. Counterfactual power means the generation reasonably expected without this inspection, not turbine nameplate power. Consider curtailment and an already-planned outage. Charge only incremental downtime once, and keep energy-value assumptions separate from supplier charges.

Test utilisation before comparing ownership and service

Utilisation changes the fixed-cost allocation. With the same annual fixed allocation, halving accepted annual volume doubles its fixed-cost component per unit. It does not necessarily double the total unit cost because variable costs may change too.

Build conservative, expected and higher-utilisation scenarios using your own inputs. Check:

• How many planned visits can actually be completed?
• Are blade geometries and access conditions compatible? Start from the access and compatibility checklist.
• How much time is lost to travel, weather or repair?
• Can the review team process the captured material?
• Will extra capacity require another crew or robot?

Compare ownership, rental and an inspection service only when available offers cover equivalent scope, evidence access, review responsibility and acceptance requirements. The lowest purchase price may not produce the lowest accepted-unit cost.