Pressure Washer Course
WJA PRESSURE WASHING COURSE CONTENT
1 REGISTRATION & INTRODUCTION
2 APPLICATIONS & MACHINES:
Effect of varying pressure/flow at the nozzle - range of jetting machines - configurations & categories (pressure washers).
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. Confined Space entry requirements.
Jet principles - purpose of nozzles - power of water jet - jet pressure/flow charatcteristic - jet reaction force. Types of nozzle - forward facing, fixed & spinning jets, multi-jet fixed & spinning nozzles.
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 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 WATER JETTING HOSE:
Hose construction & pressure ratings, external & internal damage possibilities, hazrds 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.
Hazards arising directly from water jet - from operational regime - from site environment.
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.
11 OPERATIONAL PROCEDURES:
Routine care & inspection - site preparations - preparations for operation - team operation. Safety points during operation - use of manual jetting gun, tube / pipe / drain cleaning nozzle / hose combinations & techinques. 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 © 2013