Industrial Waterjetting KZN | Waterjetting Techniques

For decades, the standard ways to clean a piece of industrial equipment were to throw chemicals at it, sandblast it, or send people in with scrapers and brushes. All three have real downsides. Chemicals are expensive, hazardous and create disposal problems. Sandblasting damages surfaces, generates dust that travels everywhere, and uses media that has to be cleaned up afterwards. Manual cleaning is slow, labour-intensive and inconsistent. The technology that has quietly replaced much of this work in modern industrial maintenance is high-pressure waterjetting.

This is a working guide to what industrial waterjetting actually does, where it earns its keep, what pressures and equipment are involved, and where the technology fits into a modern plant maintenance programme.

What waterjetting is

Waterjetting uses pressurised water, usually with no abrasive media added, delivered through specialised nozzles to clean, cut or prepare surfaces. The water does the work through the kinetic energy of the high-pressure jet rather than through any chemical action.

Operating pressures span a wide range depending on the application:

Low to medium pressure (up to 750 bar): general cleaning, light surface prep, paint stripping on softer substrates
High pressure (750 to 1,500 bar): industrial cleaning, boiler tube cleaning, tank cleaning, general surface preparation
Ultra-high pressure (1,500 to 2,800 bar and above): heavy surface preparation, hydro demolition, cold cutting, removing stubborn deposits

Waterjetting Techniques operates equipment across the 750 to 2,800 bar range, with the right pressure selected for each project.

Why waterjetting wins over older methods

No abrasive media to supply, contain, recover or dispose of
No chemical residue contaminating the process or the wastewater system
No surface damage when properly set up: removes deposits without etching the substrate
Lower dust generation: particles are wet and fall locally rather than dispersing as airborne dust
Cleaner working environment and faster post-job clean-up
Safer for adjacent equipment: no sand or grit travelling into sensitive machinery
Higher productivity than manual or sandblast crews

The trade-offs are real: waterjetting needs trained operators, reliable water and power supply, and proper containment of the runoff water. Competent contractors manage all of this routinely.

Boiler tube cleaning

Boilers in sugar refineries, chemical plants, paper mills and power stations accumulate scale, soot and ash on the heat-transfer surfaces. Scale on the water side reduces heat transfer efficiency and pushes up fuel consumption. Ash and soot on the gas side does the same.

Waterjetting cleans boiler tubes inside and out, restoring the heat-transfer surfaces to near-original condition. The standard process during a planned shutdown:

Isolation, drain-down and ventilation of the boiler
Access setup with platforms or rigging as required
Lance and nozzle selection for the tube size and deposit type
Systematic cleaning of each tube to specification
Inspection of cleaned tubes against the agreed standard
Post-clean documentation and handover

The fuel saving from a properly cleaned boiler often pays for the cleaning work within the first month of operation.

Heat exchangers, tanks and drains

Heat exchangers and economisers accumulate fouling on the heat-transfer surfaces. Waterjetting is the standard method for tube bundles in most process industries. Process tanks, storage tanks and vessels accumulate scale, sludge, polymer build-up and product residue, all removed efficiently with rotating nozzle assemblies. Industrial drainage systems are cleared faster and more cleanly than by mechanical augering or chemical dosing.

Surface preparation and coatings

Steel surfaces that need recoating, painting or protective treatment need proper preparation to ensure the new coating bonds correctly. Waterjetting at high pressure removes existing coatings, rust, mill scale and surface contaminants without etching the underlying steel. This produces a surface profile that paint adheres to reliably.

Waterjetting is increasingly the surface prep method of choice in marine, offshore, structural steel and industrial coating applications where dust control and surface integrity matter.

Cold cutting and hydro demolition

At ultra-high pressure with abrasive injection, water can cut through steel, concrete, composites and almost any other material without generating heat. Cold cutting is essential in environments where heat or sparks are unacceptable (refineries, gas plants, explosive atmospheres). It also avoids the metallurgical damage that thermal cutting can introduce.

Ultra-high-pressure water can remove concrete from a structure without damaging the steel reinforcement underneath. Hydro demolition is used in repair of bridges, dams, marine structures, water-retaining structures and any reinforced concrete where the rebar must be preserved. The technique is more precise and less structurally disruptive than mechanical breaking.

Industries where waterjetting is essential

Waterjetting Techniques' established client base across sugar refineries, chemical plants and pulp and paper manufacturers reflects the industries that have most thoroughly adopted the technology.

Sugar refineries (including Hullets and Illovo): boiler and evaporator cleaning, pan cleaning, tank and drain work during the off-crop maintenance season
Chemical plants: vessel cleaning, heat exchanger cleaning, surface prep for recoating, decontamination work
Pulp and paper: digester and recovery boiler cleaning, dryer can cleaning, tank cleaning
General industrial: any facility with process equipment requiring periodic deep cleaning

Beyond waterjetting: the wider services

Waterjetting Techniques operates a broader services offering aligned to the same industrial maintenance market.

Industrial cleaning: plant cleaning, hygiene services and general industrial cleaning
Staffing solutions: welders, fitters, boiler makers and electricians supplied for shutdowns
Plant hire: cherry pickers, bobcats, excavators and tipper trucks
Engineering services: mechanical engineering, turning, machining and fabrication
Civils and maintenance: gutters, plumbing, painting, carpentry and concrete work

The combined offering lets the firm deliver turnkey shutdown and maintenance work rather than just the cleaning component.

Safety and operator training

Waterjetting equipment at 2,800 bar carries serious hazards. A direct strike from a high-pressure jet causes severe injury or death. Operator training, equipment maintenance, work procedures, personal protective equipment and exclusion zones are all critical.

The firm operates with strict adherence to safety guidelines, ongoing training of crew members (both formal and on-the-job), and safety, risk and quality as priorities across every project. For industrial clients, the safety record of the waterjetting contractor is a primary qualification check.

B-BBEE and procurement

Waterjetting Techniques is 100 percent BEE rated and black woman-owned, led by founder Diane Govender on the customer and marketing side, with CEO Nelson Govender (23 years' experience as a qualified fitter and turner in sugar and chemical industries) on the operational and technical side. For public-sector and large corporate clients running B-BBEE-weighted procurement, this is a significant qualifier.

Getting a quote

The firm's working pattern is to conduct on-site inspections and produce fast, detailed quotations. This matters because waterjetting work depends on the specific equipment, deposits and access conditions at the site. A quote produced from a phone call is rarely accurate.

For new clients, the path is straightforward: a site visit, a scope discussion with the client's maintenance leadership, and an obligation-free written quotation. The full service catalogue, industry experience and contact information are on the Waterjetting Techniques website. Diane Govender is reachable on 072 567 6622 (diane@waterjettingsa.co.za), and Nelson Govender on 083 611 4959.

Industrial cleaning is unglamorous work that has a disproportionate effect on plant efficiency, equipment life, energy cost and operational reliability. High-pressure waterjetting has become the technology of choice across the sectors that take this work seriously, and the gap between a properly cleaned plant and a neglected one is visible on the plant's monthly numbers.