The power used in water jetting is enough to create a serious injury to any limb. Health and Safety within the water industry is of paramount importance, and is recognised by the understanding that trained staff will have a greater awareness and appreciation of safe working practices with high pressure water. Councils, insurance companies, water utilities and the major contractors all demand that subcontract staff have the correct training and hold valid Certificates.
A number of training courses are available now, starting with the Safety Awareness Certificate. The Safety Awareness course is essential as it “Validates” the other courses. It lasts three (3) years. After three years, another Safety course must be taken and passed in order to re-validate other course certificates. If your Safety certificate goes out of date, for any reason, your other certificates immediately become invalid, which means useless! A valid Safety certificate is required to keep all certificates validated.
The Safety Awareness Certificate is the first course to be passed, followed by the Surface Preparation, Drain Cleaning, Water Cutting and Tube Cleaning modules. This module can be completed by the candidate within 3 years of the initial safety awareness course being successfully completed. There is both classroom and a strong practical content to this module. At the end of the course there is a multiple choice questionnaire. The candidate has to pass this questionnaire and to successfully undertake the practical side of the course before a certificate can be issued. The module details can then be added to the candidate's Identity/medical card. For course details please see the attached course itinerary
WJA MANDATORY SAFETY AWARENESS COURSE CONTENT
1 REGISTRATION & INTRODUCTION
2 APPLICATIONS & MACHINES:
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 and recognition by the HSE Management Regulations - Risk Assessment, PPE at Work Regulations, COSH - 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 & 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 dampers, 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, and automatic off-load engine speed control systems.
7 JETTING EQUIPMENT - WATER JETTING 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 & anti freeze procedures. Use of Do / Do Not Guide.
Review of course content as above - with opportunity for any further discussion before Questionnaire.
The Water Jetting Association © 2014