CO₂ dry ice
blasting,
zero residue.
Non-abrasive, non-conductive, zero-secondary-waste cleaning for energized components, generator windings, controls cabinets, and contamination-sensitive surfaces. The only blast method that leaves nothing behind but the dirt that came off.
A blast medium that disappears.
CO₂ dry ice blasting fires solid carbon dioxide pellets at the substrate at supersonic velocity. The pellets impact, kinetically lift the contamination, and immediately sublime — converting from solid back to gas in milliseconds. There is no spent media to recover, no residue to wash down, no abrasive grit to vacuum out of an electrical winding. The only material left to dispose of is whatever contamination you removed.
That property is the entire reason this method exists in power generation. Generator stators, field windings, exciter assemblies, control cabinets, instrument bays, and turbine controls all share one constraint: any blasting medium left behind becomes a long-term reliability problem. Aluminum oxide grit in a stator winding is a future ground fault. Walnut shell stuck in a control cabinet is a future relay misoperation. CO₂ leaves no media to leave behind. That is the whole pitch.
Beyond contamination tolerance, CO₂ is non-conductive and non-abrasive. It will not pit a polished surface, will not abrade a coating, will not introduce a path-to-ground on energized equipment. Some scopes can be run with the equipment hot — generator excitation cleanings, control cabinet maintenance, hot-bus work — without taking the asset offline. That is a different kind of value: not a faster outage, but no outage at all.
The trade-off is cut rate. CO₂ removes contamination, scale, and surface deposits — but it will not strip heavy mill scale or generate an anchor profile for thermal-spray coating. For aggressive surface preparation, see turbine sandblasting. For everything where contamination tolerance matters more than cut rate, this is the method.
Where dry ice blasting earns its place.
CO₂ is not the right tool for every blast scope, but for the scopes below it is the only correct answer in most operating utility specs. These are the recurring applications across our customer base.
Generator Stator Cleaning
Hydrogen-cooled and air-cooled stator windings during scheduled maintenance. Bar-by-bar cleaning of insulation surfaces without abrasive damage to varnish or epoxy systems.
Field Winding Cleaning
Rotor field-pole cleaning between major outages. End-winding deposits, dust, and oil mist removal without scoring the copper or pitting the insulation.
Exciter & Brushgear
Brushgear assemblies, slip rings, and exciter components where carbon dust and brush-grade contamination accumulates. Returns the assembly to a clean surface without disassembly.
Controls & Instrument Bays
Switchgear, relay panels, MCC compartments, and instrument cabinets. CO₂ cleaning de-rates risk on energized panels — common during major outages when the protection scheme stays alive.
Turbine Auxiliary Skids
Lube oil skids, hydraulic power units, and compressor inlet plenums. Surface decontamination without grit-blasting risk near machined sealing surfaces and bearing journals.
Compressor Inlet & IGV
Inlet plenums, IGV (inlet guide vane) assemblies, and compressor first stages where insect, salt, and oil deposits accumulate. Restores efficiency without coating-strip risk.
Combustor & Liner Cleaning
Combustor liners and transition pieces during combustor inspections. CO₂ removes carbon deposits without damaging the thermal barrier coating where the spec disallows abrasive media.
Heat Exchangers
Plate heat exchangers, condenser tube exteriors, and radiator banks where conventional water-blast or chemical-clean methods would damage the substrate or violate plant chemistry limits.
CO₂ vs. abrasive — it is not either-or.
Most outages need both methods on the same scope. The right answer is to know which one belongs on which surface and stop making the other one fit.
Pick CO₂ when the substrate is energized, when the surface is electrical (windings, insulation, brushgear, switchgear), when the equipment cannot be disassembled and shipped out, when contamination tolerance is so tight that even one residual grit particle is a future failure, or when the cleaning has to happen without taking the asset offline. CO₂ wins these scopes hands down.
Pick abrasive blasting when the substrate needs an anchor profile for coating, when there is heavy mill scale or oxide layer to remove, when the surface will be inspected after cleaning and needs to be in defined condition, or when cut rate matters more than residue tolerance. Abrasive is faster on heavy work — it has to be, the laws of energy transfer say so.
The right scope on most outages is both. Abrasive on the rotor, casings, and steam path. CO₂ on the generator end-windings and the exciter at the same time. NDT following both. One mobilization, one crew, three scopes — the entire reason the bundled service exists is so the plant does not pay for three separate mobilizations and three separate critical-path slots in the outage window.
Where customers usually go wrong is letting one contractor try to make their preferred method fit every surface. The blast contractor who only owns abrasive equipment will quote you abrasive on a generator winding, then come back asking for an extra two days when the spec auditor flags the contamination risk. The CO₂-only contractor will quote you CO₂ on a Frame 7FA rotor and silently extend the schedule when the cut rate doesn't get there. We carry both because the answer for any individual surface is one or the other, and the answer across a whole unit is almost always both.
What's actually happening at the nozzle.
The pellets we shoot are 3mm rice-sized solid CO₂ at -109°F. They leave the nozzle at roughly Mach 1, impact the substrate, and convert from solid to gaseous CO₂ inside about 50 milliseconds — expanding ~700x in volume in the process. That micro-explosion is what lifts the contamination off the surface; the kinetic energy alone would barely register on a hardened substrate.
The thermal differential between the cold pellet and the warm contamination layer also helps. Surface deposits — oil, grease, carbon, paint, biological — contract on impact, fracture along the substrate boundary, and lift cleanly. Hard adhesion is rarely an issue because the contamination is a different material than the parent surface and they shrink at different rates.
Power requirements are modest: a standard 175 CFM diesel compressor at the curb is enough for most scopes. Pellet supply comes from on-site sublimation chambers we mobilize with the crew, fed from bulk liquid CO₂. Total mobilization footprint is a panel truck and a trailer — meaningfully smaller than a contained abrasive job, which matters in tight plant geometry.
From phone call to clean equipment.
Scope & Quote
Phone call confirms the substrate, the contamination, and whether the equipment will be energized or off-line during the cleaning. Quote is written on the same call.
Mobilize
CO₂ supply, pellet equipment, air compressor, and PPE travel together. Smaller footprint than abrasive — typically a truck and trailer rather than a containment-truck convoy.
Execute
Contamination removed surface-by-surface. CO₂ sublimes to gas; only the lifted contamination remains. Vacuum capture for the residue, no wash-down, no media recovery step.
Demob & Verify
Surface verification, photo documentation, asset returned to plant. No spent media to dispose of, no waste-stream paperwork, equipment back to plant ops same day.
Four reasons CO₂ comes off our truck and not someone else's.
Most blast contractors do not own CO₂ equipment because the upfront capital is real and the use cases are narrower than abrasive. We carry it because not carrying it means saying no to the highest-margin specialty scopes in the industry.
A real generator. A real outage window.
Plant name withheld under standard utility NDA terms. Full references available upon request from procurement.
Generator Coil & Stator Cleaning — Hydrogen-Cooled Unit
Forced outage on a hydrogen-cooled generator stator and field winding. Dry-ice blasting on the stator bars and end-winding assembly without disassembling the generator from the turbine. Zero secondary waste, no media to ship out, generator returned to test inside the 7-day outage window. The alternative — full disassembly and shop cleaning — would have run 21+ days minimum.
Questions buyers ask before they ask for a bid.
Can you really clean energized equipment?
Yes — CO₂ is non-conductive, so the standard scope on switchgear, instrument cabinets, control bays, and similar equipment is performed without de-energizing. We will still confirm the live-work plan against your plant's energized-work permit process before the truck rolls. Some scopes require de-energization regardless because of access or proximity rules; we will tell you on the bid call which is which.
Will dry ice damage the insulation on my windings?
No. The pellets are non-abrasive and the contact event is over in milliseconds — dramatically gentler on epoxy, varnish, and resin systems than any conventional cleaning method. CO₂ is the OEM-specified cleaning method on most major-utility generator scopes for exactly this reason.
What about CO₂ accumulation in confined spaces?
Always managed actively. Standard procedure includes continuous atmospheric monitoring, forced ventilation sized to the work area volume, and a confined-space entry plan when the geometry calls for it. CO₂ is heavier than air; the safety plan addresses pooling at low points before the work starts. This is standard work, but it is work — not an afterthought.
When should I use CO₂ vs abrasive sandblasting?
CO₂ when contamination tolerance and substrate sensitivity matter most. Abrasive when surface profile and cut rate matter most. Most outages need both, on different surfaces. If you are not sure, send us the scope and we will tell you which method goes on which component — that recommendation is part of the bid call.
What does CO₂ blasting cost compared to abrasive?
Per square foot of substrate, CO₂ runs higher than abrasive — the consumable cost of CO₂ pellets is meaningful. Per outage cleared, CO₂ usually wins on the scopes it is meant for, because the alternative is full equipment disassembly and shop cleaning. The bid will show the line items so the comparison is honest.
How quickly can you mobilize for a forced outage?
24 hours to anywhere in CONUS. CO₂ supply is the only logistical wildcard — for very large scopes we may stage bulk liquid CO₂ at a nearby industrial gas distributor instead of trucking it from base. That is part of the pre-mobilization call.
Generator coming out? Let's get to work.
Every quote request gets a written response inside one business day. Emergency outage line is monitored 24/7 by an American crew based in Brookhaven, Mississippi.