Chemical Cleaning
Engineered chemical cleaning that dissolves what water cannot — with chemistry matched to deposit and metallurgy, and full effluent control.
Why This
Matters
The wrong specification here doesn't show up on day one — it shows up as downtime, contamination or wasted energy later.
Asset protection
The wrong acid on the wrong alloy destroys equipment faster than any fouling; cleaning chemistry is an engineering decision, not a generic off-the-shelf procedure applied to every metallurgy the same way.
Process integrity
Deposits water cannot touch — hardened scale, process polymers, oil films — keep exchangers below duty no matter how often they are jetted. Mechanical cleaning alone cannot reach what chemistry dissolves.
Operational efficiency
Chemical cleaning reaches every tube and crevice simultaneously, restoring circuits that mechanical methods cannot fully access — including headers, U-bends and other geometry a lance cannot reach.
Where It's
Used
Chemical Cleaning in service — sector by sector, application by application.
Power & Energy
Boiler and condenser circuit cleaning and pre-commissioning flushes.
View Power & EnergyOil & Gas
Preheat exchanger and cooler descaling during shutdowns.
View Oil & GasPetrochemicals
Polymer and organic deposit removal from process circuits.
View PetrochemicalsWater & Desalination
Acid cleaning of scaled evaporator and brine heater surfaces.
View Water & DesalinationFood & Beverage
Validated CIP-compatible cleaning of process exchangers.
View Food & BeveragePulp & Paper
Liquor circuit and evaporator scale dissolution.
View Pulp & PaperHow It Works
Chemical cleaning circulates an engineered solvent through the equipment, dissolving deposits chemically, then passivates the cleaned metal and neutralises the spent solution.
- 1
Deposit samples are analysed to select solvent, inhibitor, concentration and temperature.
- 2
Temporary circulation loop is rigged with pumps, heaters and monitoring.
- 3
Solvent circulates while iron counts and pH are tracked to determine the cleaning endpoint.
- 4
Rinse, neutralise and passivate to leave a protected metal surface.
- 5
Spent chemicals are neutralised and disposed of per environmental regulations, with a documented close-out report.
Configurations
We Offer
Every variant Dolphin builds — each engineered for a specific duty, not a catalogue default.
Circulation Cleaning
- Best For
- Installed exchangers, boilers and closed circuits.
- Advantage
- Cleans in place — no disassembly or bundle pulling.
Immersion (Bath) Cleaning
- Best For
- Pulled bundles and plate packs at the workshop.
- Advantage
- Full immersion reaches geometry circulation cannot.
Pre-commissioning Cleaning
- Best For
- New circuits before first start-up.
- Advantage
- Removes mill scale and construction debris that would destroy machinery.
How to
Choose
| Criterion | Guidance |
|---|---|
| Deposit chemistry | Carbonate, sulphate, iron oxide, or organic — lab analysis picks the solvent that actually dissolves it. |
| Metallurgy | Inhibitor packages and chemistry are constrained by the most sensitive alloy in the circuit. |
| System configuration | Circuit volume, dead legs and drain points shape the rig design and flush plan. |
| Environmental constraints | Effluent neutralisation and disposal route are engineered into the job plan, not an afterthought. |
Key
Benefits
What sets chemical cleaning from Dolphin apart, in specific and measurable terms.
- 01
Reaches inaccessible deposits
Dissolves deposits mechanical cleaning cannot reach.
- 02
Base metal protected
Inhibited chemistries with monitored corrosion rates during cleaning.
- 03
Full-circuit restoration
Restores full-circuit performance in one operation.
- 04
Corrosion-protected finish
Passivation leaves surfaces protected against flash corrosion.
- 05
Compliant disposal included
Full effluent neutralisation and compliant disposal.
- 06
Cleaned to data
Documented endpoint determination — cleaned to data, not to schedule.
Technical
Specifications
Design codes, materials and testing scope confirmed for every chemical cleaning order.
| Chemistries | Inhibited HCl · citric · EDTA · alkaline degreasers · solvent blends |
| Methods | Circulation · immersion · foam/fill-and-soak |
| Monitoring | Fe counts · pH · corrosion coupons · temperature |
| Scope | Exchangers · boilers · piping circuits · pre-commissioning |
| Close-out | Passivation · neutralisation · disposal certificates |
Why Dolphin for
Chemical Cleaning
Chemistry chosen by engineers
Deposit analysis and metallurgy drive solvent selection — we clean to an endpoint, monitored in real time.
Combined-method capability
Chemical plus hydrojetting in one mobilisation tackles layered deposits other vendors bounce between.
Compliant by default
Effluent handling, neutralisation and disposal documentation are built into every job plan.
Frequently Asked Questions
From laboratory analysis of a deposit sample plus circuit metallurgy — solvent, inhibitor, temperature and duration are engineered per job.
Inhibited chemistries hold base-metal corrosion to negligible rates, verified with corrosion coupons during the clean.
Yes — temporary circulation rigs clean installed exchangers, boilers and circuits without disassembly.
By data: dissolved iron and pH stabilisation define the endpoint, followed by inspection.
Full neutralisation and disposal through approved routes, with certificates in the close-out dossier.
Yes — degreasing, pickling and passivation of new circuits ahead of first start-up.
Yes, with chloride-controlled chemistries for stainless and dedicated protocols per alloy.
Send circuit details and, ideally, a deposit sample through our RFQ form; we return an engineered method statement.
Talk to an Engineer About Chemical Cleaning
Send your duty requirements or existing datasheet — our engineers will confirm the right configuration and get you a quote.