How should contractors compare robotic preparation proposals with different equipment and support requirements?

Contractors should compare robotic preparation proposals by converting every bid to the same baseline: identical surface area, target surface standard, pressure range, crew size, support equipment and downtime assumptions. Only then does a price comparison mean anything. A cheaper proposal often leaves out the vacuum unit, power supply, waste handling or operator training that another bid includes. The proposals that look most different on paper are often the most similar in practice, once you strip out what each one leaves unsaid. Below, we answer the questions contractors ask most when they put robotic waterjetting, abrasive blasting and similar offers side by side.

What hidden assumptions make robotic proposals hard to compare?

Robotic proposals are hard to compare because each supplier assumes different things about the job: surface condition, access, utilities, waste handling and who supplies the support equipment. These assumptions rarely appear on the front page of a quote, yet they decide whether the final cost matches the quoted price.

The most common hidden assumptions fall into a few groups:

• Surface condition: One bid assumes light coating on flat plate, another assumes heavy scale, weld seams and curvature.
• Surface standard: “Clean” can mean different things. Check whether the target is a defined cleanliness grade, a roughness profile or simply visual cleanliness.
• Productivity rates: A quoted square meters per hour figure may be a peak value on an ideal surface, not an average over a full shift.
• Utilities and access: Power, water quality, compressed air, scaffolding and lifting gear may or may not be included.
• Waste and containment: Open blasting and closed, vacuum-collected blasting create very different cleanup and compliance workloads.

Ask every bidder to list their assumptions in writing. If two proposals differ widely in price, the gap usually sits in this list rather than in the equipment itself.

How do you normalize scope across different bids?

Normalize scope by building a single scope template and asking each bidder to price against it. The template should define area in square meters, surface condition, target finish, pressure range, access method, working hours and the exact boundaries between what the contractor supplies and what the client supplies.

A practical normalization process looks like this:

1. Write one scope sheet with surface area, coating or deposit type, substrate, geometry and finish requirement.
2. Fix the technical envelope. For example, state that water jetting should operate in the 500 to 3000 bar range, and specify any abrasive or vacuum requirements.
3. Define the boundaries for utilities, waste disposal, scaffolding, permits and site supervision.
4. Request line item pricing for mobilization, equipment, labor, consumables, support gear and demobilization.
5. Ask for stated productivity and its basis, such as average rate across a shift versus best case.

Once every bid is expressed in the same structure, gaps become visible immediately. A missing line is far more informative than a low total.

What support requirements should be priced into each proposal?

Every proposal should price the equipment that keeps the robot working: the high-pressure pump, vacuum or recycling unit, power and water supply, spare parts, a trained operator and a technician for first-line fixes. If any of these is absent, the client or contractor ends up paying for it later.

Check each bid for these support items:

• High-pressure pump unit: Confirm the pressure and flow ratings match the tool. Many robotic jetting tools work with pressures up to 3000 bar, so the pump must be rated accordingly.
• Vacuum or recovery equipment: Closed blasting needs a vacuum unit connected to the tool to collect water and debris. Sandblasting with recovery needs a recycling unit.
• Power and water: Electrical capacity, cable length, filtration and water consumption affect site setup.
• Personnel: Operator numbers, certification and standby cover for shifts.
• Spares and consumables: Nozzles, seals, wear plates and abrasive all add cost over a long job.
• Transport and handling: A compact crawler can move by hand through narrow spaces, while heavier setups need lifting equipment.

On safety, it pays to confirm that operators follow recognized water jetting practice. The relevant bodies include SIR in the Netherlands, EWJI in Europe, WJA in the UK, WJTA in the USA and DIRV in Germany. Ask each bidder which of these standards or training schemes their crews follow.

How do you compare equipment capabilities side by side?

Compare equipment by matching technical specifications to the actual job: surface type, curvature, pressure range, flow, cleaning path width, vacuum capability and hazardous area rating. A capability table built from the scope sheet shows which machine truly fits and which one only looks impressive on a datasheet.

Which specifications matter most?

Focus on the specifications that change results on site. Pressure and flow decide stripping power, so check both: a tool running at 3000 bar with up to 25 liters per minute (about 6.6 gallons per minute) behaves very differently from a lower-rated one. Cleaning path width drives productivity, and vacuum performance decides whether the surface is left clean and dry or still wet.

Which application limits should you verify?

Magnetic crawlers suit flat and slightly curved steel surfaces, so non-ferrous or heavily contoured surfaces call for a different approach. Check the minimum curvature radius, the weight and size for transport, and whether the unit is available in an explosion-protected version when work happens in a hazardous zone, such as an ATEX Zone 2 area. Ask what tooling options exist, for example, closed vacuum blasting versus open swing arm blasting, since the right tool depends on whether debris must be collected.

Should contractors weigh safety and risk above price?

Yes. Safety and risk should carry more weight than the lowest price, because one incident, rework cycle or failed inspection can cost more than the entire saving. A robotic approach also moves personnel away from the jet, which reduces exposure to high-pressure water, dust and confined or elevated work areas.

Weigh these risk factors alongside price:

• Operator exposure: Remote-controlled equipment keeps people out of the jetting zone, a major benefit at working pressures between 500 and 3000 bar.
• Containment: Closed systems that collect water, debris or abrasive reduce airborne particles and cleanup liability.
• Hazardous area suitability: Confirm certification where flammable atmospheres are possible.
• Training and compliance: Look for crews trained to the standards of SIR, EWJI, WJA, WJTA or DIRV, depending on your region.
• Reliability: A machine that stalls mid-turnaround creates schedule risk that no discount covers.

A practical method is to score each bid on safety and risk first, then compare prices only among the proposals that pass a minimum safety threshold.

What is the real total cost of a robotic preparation proposal?

The real total cost is the quoted price plus everything the quote leaves out: support equipment, consumables, downtime, rework, waste disposal, training and demobilization. In euros, a proposal that is 10 percent cheaper on paper can end up costing more once these items are added back in.

Build a simple total cost model for each bid:

1. Direct costs: Equipment hire or purchase, labor, mobilization and demobilization, all in euros.
2. Support costs: Pumps, vacuum or recycling units, power, water, lifting gear and transport.
3. Consumables and wear: Nozzles, seals, wear plates and abrasive over the full job duration.
4. Waste and cleanup: Collection, treatment and disposal of water, paint residue and used abrasive.
5. Schedule risk: The cost of each extra day of downtime, multiplied by the likelihood of delay.
6. Quality risk: The cost of rework if the surface fails to meet the coating or inspection requirement.

When the equipment will be reused across several projects, add ownership factors such as maintenance, spare parts availability and operator training. Long-term cost per square meter, not the opening quote, is the number worth comparing.

How Our Robotic Systems Help with Comparing Preparation Proposals

We build robotic surface preparation equipment in the Netherlands, so we know where proposals tend to go wrong and what a complete bid should contain. Our MagTrack robotic system is a modular magnetic crawler built around a universal carrier, which makes it easier to define scope and compare like with like.

• Modular tooling: One carrier takes different tools, from a vacuum water jetting blast can to a curved blast can for surfaces with a radius of up to 3 meters, and a sandblaster swing arm for open abrasive blasting.
• Clear technical envelope: High-pressure tools operate up to 3000 bar, giving you a defined specification to hold every bid against.
• Closed, collected blasting: The vacuum blast can collects water and debris without leakage, leaving a clean and dry surface and reducing cleanup assumptions.
• Compact option for tight spaces: The MagTrack Mini is lightweight, easy to transport, available as a certified ATEX Zone 2 unit, and works at up to 3000 bar at 25 liters per minute.
• Training and support: Through our subsidiary DERC Adviesgroep, we offer certified training that helps crews work safely and consistently.

Planning a turnaround or comparing bids right now? Contact us with your scope sheet, and we will help you check pressure range, tooling, support equipment and safety requirements before you commit. Visit magtrack.nl to see the full range.