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A jet of water at 40,000 PSI cuts through steel. It cuts through concrete. And it cuts through human tissue in a fraction of a second—without the operator even feeling the initial impact.
This is the most powerful tool available in industrial cleaning. And, like any powerful tool, the problem is rarely what it can do. It's knowing when it's needed—and when it's not.
What is UAP hydroblasting?
UAP stands for Ultra High Pressure. It refers to hydroblasting performed with pressures above 30,000 PSI (approximately 2,070 bar), and can reach up to 40,000 PSI.
The principle is the same as any hydroblasting: pressurized water is projected against the surface, and the kinetic energy of the impact breaks down the adhered material. What changes is the intensity of this energy—and, with it, the type of material that can be removed.
SAP, SUP and UAP: the three tracks
Hydroblasting is not a single process. The pressure ranges serve distinct purposes:
| Range | Pressure | Typical application |
|---|---|---|
| SAP Super High Pressure | 10,000 to 20,000 PSI | Heat exchangers, piping, tanks — light to medium fouling. This is the routine range. |
| SUP High Pressure | 20,000 to 30,000 PSI | Heavy cleaning, coke removal, reactors, pressure vessels. |
| UAP Ultra High Pressure | 30,000 to 40,000 PSI | Removal of coatings, cold cutting, concrete cutting, surface preparation for painting. |
“The question I always ask when someone requests UAP is: have you tried lower pressure? Many people request ultra-high pressure because it seems more efficient. But if a fouling comes off at 15,000 PSI, using 40,000 is wasteful—and risks damaging the surface. The right pressure is the lowest pressure that solves the problem.”
— Reimar Cruz, Operations Director at TSL
When is UAP really needed?
Removal of coatings and paints
Layers of industrial paint, epoxy coatings, and anti-corrosion systems adhere strongly to the substrate. UAP removes these layers without attacking the metal underneath—something that abrasive methods do with far less precision.
Surface preparation for painting
UAP hydroblasting achieves cleaning standards equivalent to SA 2½ and SA 3, ensuring adequate adhesion for new paint systems. The advantage over abrasive blasting is significant: it generates much less solid residue and no suspended particles.
Cold cut
The UAP cuts steel, concrete, and composites without generating heat. This matters when hot cutting is impractical—in areas with flammability hazards, in structures where thermal distortion is unacceptable, or in temperature-sensitive materials.
Severe incrustations
Hardened deposits, coke in reactors, cemented materials inside equipment — situations where smaller strips simply won't remove them.
Why doesn't the UAP generate sparks?
This is the feature that makes UAP viable where no other method is.
Mechanical removal methods—grinding, brushing, abrasive blasting, thermal cutting—generate sparks or heat through friction. In a classified area, where flammable vapors may be present in the air, any of these sparks poses an explosion hazard.
Hydroblasting uses only water. There is no metal-to-metal friction, no combustion, and no sparks. This allows for surface cleaning and preparation on offshore platforms, refineries, and petrochemical plants in operation—environments where thermal shedding would require a complete unit shutdown.
“On the platform, the UAP is often the only viable option. It's not that it's better: it's that any alternative would require stopping production of the entire unit to eliminate the risk of ignition. The cost of this shutdown is orders of magnitude greater than the cost of operation.”
— Reimar Cruz, Operations Director at TSL
Offshore applications
On offshore platforms, the UAP is mainly used for:
- Structural maintenance — removal of corrosion from metal structures exposed to the marine environment.
- Surface preparation for repainting — the offshore anti-corrosion system requires periodic renewal.
- Cleaning of tanks and process equipment
- Removal of deteriorated coatings on decks and structures.
The combination of a corrosive environment, classified area, and the impossibility of shutdown makes offshore the scenario where UAP (Unmanned Aerial Vehicle) has the greatest advantage over any alternative, directly benefiting from... Hydroblasting | Hydrojet Rental and Operation.
Security: what the operation requires
The energy involved in UAP (Unmanned Aerial Vehicle) does not allow for improvisation. Operations proceed as follows:
- NBR 14533 — specific Brazilian technical standard for safety in hydroblasting
- NR-12 — safety in machinery and equipment, applied to high-pressure pumps
- NR-33 — when the operation takes place inside tanks or confined spaces
- NR-35 — when performed at height
- NR-06 — Specific PPE, including protective clothing against jet impact.
UAP operators receive specific training. It's not an extension of conventional hydroblasting—it's a separate training program because the margin of error is different.
Frequently Asked Questions
What does UAP mean in hydroblasting?
UAP stands for Ultra High Pressure. It refers to hydroblasting with pressures above 30,000 PSI, reaching up to 40,000 PSI.
What is the difference between SAP, SUP, and UAP?
These are pressure ranges. SAP (Super High Pressure) operates between 10,000 and 20,000 PSI for routine cleaning. SUP is between 20,000 and 30,000 PSI for heavy-duty cleaning. UAP exceeds 30,000 PSI and is used for coating removal, cold cutting, and severe encrustations.
Can UAP (high-pressure water jetting) damage the surface?
Yes, if the pressure is incorrectly sized for the material. That's why a prior technical assessment is essential: it defines the appropriate pressure for the substrate and the type of waste. The rule of thumb is to use the lowest pressure that solves the problem.
Why is UAP safe in classified areas?
Because it doesn't generate sparks. Unlike mechanical or thermal methods, hydroblasting uses only pressurized water—without metal-to-metal friction, combustion, or sparks. This allows it to operate in environments with a risk of explosive atmospheres.
Does UAP replace abrasive blasting?
In most surface preparation applications, yes — and with advantages: it meets SA 2½ and SA 3 standards, generates much less solid residue, and does not produce suspended particles. In specific situations requiring a determined roughness profile, the methods can be combined.
How much water does UAP hydrojetting consume?
Less than you might think. The efficiency of UAP comes from pressure, not volume. Water consumption is relatively low compared to low-pressure, high-volume methods—and there is no generation of chemical effluent, only water and the removed material.
TSL Engenharia e Serviços operates ultra-high pressure systems up to 40,000 PSI, serving projects of industrial hydroblasting, naval and offshore with certified teams, in addition to a specialized fleet in 40,000 PSI water jet.
