Mobile on-site blasting: how do you prepare the site?

For mobile on-site blasting, the client prepares vehicle and equipment access, a power source for lighting and auxiliary equipment, a water point if the method requires one, a cleared and marked work zone, the site work permits and protection for nearby equipment. The crew brings the compressor, blasting equipment, abrasive, containment, dust collection and inspection instruments.

Mobile blasting means cleaning a surface where it stands, without shipping parts to a shop. It applies to steel frames, tanks, conveyors, fixed equipment and concrete slabs. Success depends as much on site preparation as on the operator: a blocked access road, a missing permit or a poorly protected motor is enough to stop the job. This guide is written for maintenance managers and project managers in Quebec and Ontario. For the choice between methods, see also our comparison of wet vs dry abrasive blasting.

What access does the equipment need?

You need a drivable route for a truck and trailer to a stable setup area, at a reasonable distance from the structure. The compressor and blast pot sit outdoors or in a ventilated area, and the air and abrasive hoses run to the work zone.

Points to check before mobilization:

• Setup area. Firm, clear ground, away from site traffic lanes, with room to unload abrasive and store waste.
• Hose route. A path without tight bends, protected from forklifts and vehicles, that blocks no emergency exit.
• Work at height. Scaffolding, boom lift or scissor lift depending on the height of the structure; state who supplies and who inspects that access.
• Access hours. Gate opening hours, any escort requirement and parking rules.

Should the client supply power and water?

Yes in most cases: power runs the lighting, ventilation, dust collector or dehumidifier, and water is used for wet blasting, soluble salt washing or final cleaning. The compressor is usually self-contained, but auxiliary equipment is not always.

To specify at the quote stage:

• Power. Panel location, available voltage and amperage, distance to the work zone, site rules for extension cords and protected outlets.
• Water. Tap or hydrant nearby, water quality (wash water must be clean and must not add salts), and whether waste water can be collected and discharged under site rules.
• Plant compressed air. It generally does not replace the blasting compressor; its use is confirmed with the crew.

If the job requires humidity or temperature control, see our article on dehumidification and heating for coating jobs.

How do you set up the work zone?

You mark a perimeter around the structure, closed to anyone without protective equipment, then clear the zone of anything abrasive could damage or contaminate. The containment level depends on the environment, the nature of the existing coating and how close production is.

Containment classes are covered in our guide to SSPC Guide 6 blasting containment, and dust measures in an operating plant in blasting in operating plants and dust control.

Which permits and authorizations are needed?

You need the site's own work permits, issued before mobilization: general work permit, lockout of affected equipment, confined space entry permit if the work is inside a tank or pit, and work at height authorization where needed. Blasting is not hot work in the strict sense, but some sites treat it as such near flammable products; the site rule applies.

The client also provides:

• The site health and safety rules and the required site orientation.
• Safety data sheets for products present in the zone.
• Notice to internal neighbours, such as production and maintenance teams.
• Environmental authorizations if waste or wash water must be handled in a particular way.

A joint hazard analysis done before day one prevents most job stoppages.

How do you protect nearby equipment?

You protect everything abrasive can wear, scratch or contaminate: motors, bearings, gearboxes, electrical cabinets, instruments, glass, seals and machined surfaces. Abrasive grit gets in through openings and vents, and dust settles far from the zone.

• Rotating equipment. Cover and seal motors, bearings and couplings; check they are stopped and locked out if the zone requires it.
• Electrical and instrumentation. Close cabinets, plug cable entries, protect sensors and displays.
• Surfaces that must not be blasted. Nameplates, threads, flange faces, cylinder rods and nearby stainless steel or aluminum parts.
• Building ventilation. Isolate nearby air intakes so dust does not circulate through the plant.

The client states what must remain accessible or in service during the work. The crew then adjusts containment and the schedule.

What does the blasting crew bring?

The crew arrives with all the blasting, containment, safety and inspection gear. Our crews and qualified subcontractors mobilize equipment suited to the structure and to the chosen method.

• Air supply and blasting. Compressor, aftercooler and moisture separator, blast pot, hoses, nozzles and remote controls.
• Abrasive. Chosen for the required profile, the metal and whether it can be recovered; see our guide to choosing a blasting abrasive.
• Containment and dust control. Tarps, temporary structures, dust collector and vacuum recovery of spent abrasive.
• Safety. Supplied-air blast helmets, breathing air filters, hearing protection and personal protective equipment.
• Inspection. Instruments to measure dew point, surface profile and cleanliness, with a record of readings.

How does a mobile blasting job run?

A job follows a simple sequence: visit, work plan, mobilization, blasting, inspection, coating, cleanup and handover. The duration of each step is set at the quote stage based on area, access and the work window.

1. Visit and survey. Photos, dimensions, condition of the existing coating, production constraints.
2. Work plan. Method, target cleanliness grade (for example SSPC-SP 6 or SP 10), containment, schedule and the list of each party's responsibilities.
3. Mobilization. Setup of equipment, barriers, containment and protection.
4. Blasting. By sections, with continuous monitoring of ambient conditions.
5. Inspection. Cleanliness, profile and dust checked before any coating.
6. Coating. Primer applied within the planned window to avoid flash rust, then the specified protective coatings system.
7. Cleanup and demobilization. Abrasive collection, removal of protection, delivery of a report.

During a plant shutdown, this sequence fits into the overall schedule; our article on planning coating work in a shutdown and our project management service cover this.

How do you get a quote for mobile blasting?

Send photos of the structure and its access, approximate dimensions, the existing coating if known, the required cleanliness grade and the available work window. This information lets us propose the right method, containment and equipment. Price factors are explained in our article on sandblasting cost.

Our abrasive blasting page presents our surface preparation methods. We work from LaSalle, including in Montreal, Abitibi-Temiscamingue and Ontario. Submit a request for a quote: pricing on consultation, reply within 24 business hours.

Frequently asked questions

Can mobile blasting be done while the plant is running?

Often, yes, provided the zone is contained, dust is controlled and running equipment is protected. Some zones still require a shutdown or lockout for safety.

Who handles blasting waste?

The crew collects and bags spent abrasive and paint debris. The client states the disposal route accepted by the site, especially if the original coating contains lead or other metals.

Does the whole area have to be cleared of staff?

The marked perimeter must stay closed to anyone without protection. The rest of the plant can keep running if containment and dust collection are adequate.

What happens if it rains or humidity is too high?

Blasting is suspended or the air inside the enclosure is controlled. A surface blasted in poor conditions may rust before priming and will have to be blasted again.