Chapter 7 - waterjetting Flashcards
The WJ-1 (visual cleanliness) is comparable to which abrasive blast cleaning standard?
ISO SA3
A general description of Robotic waterjetting includes?
Attaches using vacuum, cables, or magnets.
Vertical, horizontal or overhead surface.
Controlled by single operator.
Collects in excess of 95% of the water, removed coatings and rust ( waste generated).
A typical waterjetting team consists of?
The nozzle operator
The pump operator
Additional operators or workers
Waterjetting is effective for removing?
Surface oil and grease.
Rust.
Concrete (shot-Crete) spatter
Existing coatings
Water-soluble contaminants that cannot otherwise be removed by abrasive blasting
An underwater unit used to clean barnacles or other micro-organisms for ship hills or off-shore platform legs
Describe two of the considerations with regards to “back thrust”.
Causes fatigue
Should be no more than 1/3 of operators body weight
To ensure a safe work place, before commencing the job, the waterjet team should ensure that?
The work area is properly barricaded.
Electrical equipment protected from the water.
Electrical connections are not allowed to sit in water.
All fittings and hoses are in good condition/proper pressure rating.
Nozzles free of obstruction.
Systems is flushed clean and air removed.
The dump system and all control system are operational.
Proper LOTO provisions/confined space entry requirements.
Waterjetting advantages include?
Worker safety. Worker air quality. Respiratory requirements may be less stringent. No dust contamination or clean-up Friendly to the environment Relatively cost efficient. It requires less clean up.
Disadvantages of waterjetting include?
The surface must have a profile (waterjetting leaves no profile).
Equipment is very expensive.
Danger of injection into the skin or serious cuts
Danger of UHP hose breaking.
Collecting and disposing of the contaminated water.
Proficient operators.
