The text below is excerpted from the WJTA's Industry Best Practices for the Use of High Pressure Waterjetting Equipment, First Edition, and provides an example of a pre-service and operational checklist for high pressure water cleaning.
Example of a Pre-Service and Operational Checklist for High Pressure Water Cleaning
Equipment, structure, or area being cleaned :
• Is the area, including the other end of the unit being cleaned, adequately barricaded, with proper warning signs posted?
• Have precautions been taken to protect all electrical equipment?
• Is there any hazard to personnel from possible damage to equipment, such as release of corrosive chemicals, flammable liquids, or gases?
• Are all fittings of the correct pressure rating in accordance with 14.12 in the Glossary?
• Are all hoses of the correct pressure rating in accordance with 14.17 in the Glossary?
• Have all hoses and fittings been visually inspected and deemed to be in serviceable condition?
• Are all hoses identified to be in compliance with hose testing requirements and WJTA color coding based on pressure?
• Are all nozzles free from plugging and in good operating condition?
• Have precautions been taken to prevent line-mole reversal?
• Are anti-withdrawal devices properly installed and in operable conditon?
• If applicable, has the customer issued the valid work permit?
• Is the scope of work clearly defined?
• Is the pump level and positioned on level ground?
• Are the wheels properly chocked?
• Is the pump grounded?
• Have all identified hazards been eliminated or controlled and communicated to the waterjetting crew? • Have all high pressure connections been properly assembled, including the use of Teflon tape or the correct lubricant as required?
• Have whip checks been installed at all high pressure hose connections?
• Has line of sight or other communication been established between the lance/gun operator and pump operator?
• Have hand signal communications been defined and communicated to the waterjetting crew?
• Do all members of the waterjetting crew have a waterjet medical alert card in their possession?
• Have appropriate PPE requirements been determined and implemented?
• Is the filter on the pump inlet water supply clean and in good operating condition?
• Is there an adequate water supply?
• Have precautions been taken against freezing?
• Do all personnel have the proper equipment for this job?
• Do all personnel have the proper training for this job?
• Are all personnel qualified to perform this work?
• Has the complete system from pump to nozzle been flushed and air removed from the system before installing the nozzle?
• Has hookup, including pipes, hoses, and connections, been pressure tested with water at the maximum operating pressure and found to be leak free?
• Is the dump system operating properly (will it dump when released)?
• Are all control systems operational?
• Have you held a job site safety meeting and discussed site specific safety procedures, including how to activate the Emergency Medical Services (EMS) System?
• Have all hazards located within the work area been identified and secured or controlled? Are crew members aware of the hazards and controls? • Is the location of first aid equipment and an emergency medical center known?
• Has the job site been examined to determine if Confined Space Entry Requirements apply?
• Has all the relevant moving equipment, such as conveyors, choppers, mixers, valves, etc., been mechanically or electrically disable with appropriate lockout-tagout procedures?
• Has the job been examined for environmental considerations, with action as appropriate?
See the complete section in the Industry Best Practices for Use of High Pressure Waterjetting Equipment. The Industry Best Practices includes information about responsibility, accidents, pre-service and operational checklists
and procedures, PPE, training requirements, waterjet team responsibilities, care and maintenance of equipment, automated equipment, permanent cleaning areas, design criteria, and a glossary of definitions and guidelines.
Source : www.waterjet.org