Surface Preparation

A one day module combining classroom and practical elements for holders of valid Safety Awareness certificates. Leads to operational status.

Key Facts

The WJA Surface Preparation module is a one day course that builds upon the Safety Awareness course.

The course covers safe water jetting operations for surface cleaning and surface preparation activities

Dependant on a valid Safety Awareness Certificate

The WJA Surface Preparation module, like the other individual individual modules offered through the WJA can only be completed whilst holding a valid Safety Awareness certificate. The WJA Safety Awareness course is a pre-requisite for all of the WJA’s modules.

Forever Certified 

The WJA Surface Preparation module, like the other individual individual modules offered through the WJA does not need to be repeated/refreshed whilst a WJA Safety Awareness certificate remains valid.  Refreshing the Safety Awareness certification every three years revalidates associated modules.

It is therefor important to understand that if an operator should let their Safety Awareness certificate expire then all associated modules expire with it. To become certified in this case all modules would need to be completed after completing the Safety Awareness course.


Adding a WJA Surface Preparation certificate to a WJA Safety Awareness certificate grants the holder of the qualification ‘operational’ status on their WJA Photocard.


At the end of the module a 20 question multiple choice assessment must be completed. A score of 75% or greater must be achieved in order to pass the course and gain certification.

WJA Surface Preparation Course Content

Below is a comprehensive schedule of the course content

Tap/click to expand

Registration & Introduction
Review of Key Safety Awareness Issues

Nozzles & jets – pumps & ancillaries — pressure controls — water jetting hose — hazards & injuries — PPE —
operational procedures

Applications & Machines

Scope of surface cleaning & preparation applications. Range of tasks and differentiation between surface cleaning & surface preparation. Range of jetting machines suitable for surface cleaning / preparation.

Jetting Equipment - Nozzles & Ancillaries

Review nozzle principles fixed jet nozzles, rotating nozzles, life & wear characteristics, associated ancillary equipment including automatic, semi automatic & wet abrasive blasting.

Jetting Equipment — Water Jetting Hose

Hose used in surface cleaning & preparation applications, damage & wear possibilities, hose ancillaries.

Review bore size & flow ratings.

Jetting Equipment - Machines

Range of jetting machines used engine controls & instruments. Pump pressure controls, review dump/dry shut & selector/fail safe types, auto engine speed control systems, pressure safety relief.

Water supply/delivery features filtration requirements, boost feed pumps, built-in anti freeze provisions.

Job Assessment & Planning

Information & assessment site location, access to work area, surface to be cleaned & layout; base material & contaminants initial condition and required finished condition; water provision, waste disposal, hazards.

Selection of equipment & manning levels jetting machine/nozzles/accessories, number & duties of operators, single person operation. Determine job method, based on safe system of work.

Operational Procedures

Daily checks manufacturers’ instructions, other items requiring regular checks.

Setting up permits/authorisations, barriers & warning signs, positioning of machine & equipment, team duties & signals, flushing, leaks check, trial run. Monitoring of operation flying debris, waste containment, work standard.

Job completion client inspection, waste removal, equipment decontamination, return site to safe condition.

Practical Exercises

Jetting machine & equipment review features and demonstrate daily checks, start / run / stop.

Job assessment review & discuss site location & constraints, accessibility, screening/extraction requirements.

Work surface nature of contamination, work to be carried out & standard of finish. Water supply, effluent drainage. Hazards & use of PPE. Discussion of options, agree job method.

Site preparation setting up work area. Team talk review job method, signals, set up team(s). Positioning of jetting machine, layout & check equipment.

Demonstrate all procedures to full group. For all teams, instruct each operator in each duty.

Trainees carry out exercise each team following instructions to set up, flush, check for leaks, carry out trial run, proceed with operation. Rotate team members through duties. Review at each rotation and final review.

Disconnect equipment & clear site.


Review of course content as above – with opportunity for any further discussion before Questionnaire.

Train at our purpose built training facility

Built from the ground up as a water jetting training centre we can deliver all WJA courses in true to life scenarios

COVID-19 secure featuring one way system, social distancing, sanitisation stations and regular anti-bacterial fogging.

Tube bundles, concrete blocks, coated surfaces, sewer pipework. All available for practical demonstration and training purposes.

Our facility is flood lit to make training possible around the clock and all year round. 

We use bespoke resources to enhance our delivery and aid understanding. 

Our classroom environment features up to date audio/visual equipment to support our expert delivery.  

Our trainers are experienced in both water jetting and delivering training courses ensuring high levels of instruction.

Next Steps

Once a candidate has successfully completed the WJA Safety Awareness course any of the further modules can be completed in any of the specific disciplines in order to gain operational status. 


Tube, Pipe & Bundle

Drain & Sewer