WJA Surface Preparation Module (SP)

Candidates will learn the safe operation of jetting equipment for surface preparation application

Water Jetting Association (WJA) Surface Preparation & Cleaning Module (SP)

In addition to classroom instruction, we provide practical instruction and training on the safe and efficient use of high-pressure water jetting equipment. Whether it’s to clear floor areas, strip coatings, remove graffiti, or clean industrial equipment the WJA Surface Preparation and Cleaning Module has you covered. The WJA Surface Preparation and Cleaning training module provides a thorough understanding of high pressure water jetting equipment, its safe and effective use, as well as various types of surface preparation and cleaning techniques. The course takes you from start to finish in surface preparation and cleaning, with a focus on safety, operator productivity, and environmental impact. With the knowledge and skills acquired in this course, students will be able to safely prepare and clean surfaces using high pressure water jetting equipment.

Key features of WJA Surface Preparation Module


One Half Day Contact Time


Classroom and Practical Elements


Receive an Operational Jetting Card

Welcome to ASL Group

Benefits of WJA Training


Candidates will gain a greater understanding of the dangers and safety requirements of high pressure water jetting.

Hands On

Candidates will gain hands on time with the kind of jetting equipment commonly used in surface preparation and cleaning applications as well as carry out some cleaning opertations.


Candidates will gain a deeper understanding of the jetting principles increasing their ability to carry out surface preparation and cleaning tasks.


Candidates who successfully complete the course gain a City and Guilds approved certificate and photo card showing their credentials.


Registration & Introduction

Nozzles & jets – pumps &ancillaries- pressure controls- water jetting hose – hazards & injuries – PE – operational procedures.

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.

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

Hose used in surface cleaning & preparation applications, damage & wear possibilities, hose ancillaries. Review bore size & flow ratings.

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.

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.

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 fo operation – flying debris, waste containment, work standard.
Job completion – client inspection, waste removal, equipment decontamination, return site to safe condition.

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 teams). 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 further discussion prior to Questionnaire.