WJA Safety Awareness Course

This course is the first to be completed and must be passed prior to any further jetting modules. (For additional course modules please click on any of the blue buttons to the right). This is a classroom only course but a practical jetting exercise ie. HP water jetting lancing can be instructed subject to the client having the equipment to use on site in a safe manner. At the end of the course there is a multiple choice questionnaire. The candidate has to pass this questionnaire before a certificate and photo site ID card can be issued. For course details please see the course summary below. Please note the WJA Safety Awareness Course has a 3 year validity period and the trainee has to re-sit the course within the 3 year period otherwise any additional modules taken within the 3 year period will have to
be re-taken in addition to the Safety Awareness Course.

WJA SAFETY AWARENESS TRAINING COURSE - CONTENT SUMMARY

1 REGISTRATION & INTRODUCTION

2 APPLICATIONS & MACHINES:
Cleaning & surface preparation - surfaces / drain & sewers / pipes / tubes. Jet cutting - precision and volume removal. Effect of varying pressure / flow at the nozzle. Range of jetting machines, configurations & categories (Pressure Washers / General Purpose / Medium-Heavy Duty / UHP / Drain & Sewer Jetters).

3 LEGISLATION & THE WJA CODES OF PRACTICE:
Health & Safety at Work Act. WJA Codes of Practice, status, use & recognition by the Health and Safety Executive (HSE). Management Regulations - Risk Assessment, PPE at Work Regulations, COSHH. Employer/ Employee responsibilities. Enforcement Powers. Other relevant legislation - e.g. Environmental Protection Act, Control of Pollution Act.

4 JETTING EQUIPMENT - NOZZLES:
Jet principles - purpose of nozzles, power of water jet, jet pressure/flow characteristics, jet reaction force. Types of nozzle - forward facing, fixed & spinning jets, multi-jet fixed & jet spinning nozzles

5 JETTING EQUIPMENT - PUMPS:
Pump configuration - standard piston ~ plunger pump, positive displacement action, operating features, effects of blockages, variation of plunger sizes. Other pump configurations, diaphragm and intensifier types. Drive arrangements, engine / electric motor, hazardous area equipment
Water supply/delivery features - filtration requirements, boost feed pumps, pulsation dampeners, jump jet. Pressure safety relief options - relief valve / bursting disc. Pressure gauge features.

6 JETTING EQUIPMENT - PRESSURE CONTROLS:
Dump & dry shut controls, fail-safe / selector versions, direct manual operation / remote operation via electric-pneumatic-hydraulic controls, automatic unloader valve for dry shut, pressure regulators, automatic off-load engine speed control systems.

7 JETTING EQUIPMENT - HIGH PRESSURE HOSE:
Hose construction & pressure ratings, external & internal damage possibilities, hazards arising from damaged hoses, inspection requirements. Hose end fittings, construction / assembly / testing. Connectors & hose end couplings - types & features. Bore size & flow ratings. Hose for general / high flow / small bore tube & pipe cleaning.  Pressure drop due to flow through hose & lances - effect on pressure available at the nozzle.

8 WATER JETTING HAZARDS:
Hazards arising - directly from the water jet - from operational regime - from site environment.

9 WATER JETTING INJURIES:
Effects of impact by high pressure water jet, nature of internal injuries caused, action in event of a jetting injury -awareness of possible absence of visual injury & use of WJA Medical Card.

10 PERSONAL PROTECTIVE EQUIPMENT:
General principles regarding use of PPE, as a last resort. Main body protection - limits on effectiveness against direct impact of water jet. Protection of head / hands / feet / hearing / respiration. Particular requirements when using UHP

11 OPERATIONAL PROCEDURES:
Routine care & inspection, site preparations, preparations for operation, team operation.  Safety points during operation - use of manual jetting gun/lance, tube/pipe/drain cleaning nozzle/lance/hose combinations & techniques. Safe use of non-standard equipment - e.g. tee nozzle. Site shutdown & antifreeze procedures. Use of Do/Do Not Guide.

12 SUMMARY:
Review of course content as above, with opportunity for any further discussion before Questionnaire.

The Water Jetting Association © 2003