NACE CIP Level 2 Questions and Answers Already Passed

NACE CIP Level 2 Questions and Answers Already Passed Describe what the characteristics of a heavy flash rusted surface are. 7-5 Rust that is loosely adherent, easily comes of, & leaves significant marks on a cloth that is lightly wiped over the surface. Describe what the characteristics of a moderate flash rusted surface are. 7-5 Rust that is reasonably well adherent and leaves light marks on a cloth that is lightly wiped over the surface. Describe what the characteristics of a light flash rusted surface are. 7-5 Rust that is tightly adherent & not easily removed by lightly wiping with a cloth. At what psig is low-pressure cleaning preformed at? 7-2 below 5000 psig At what psig is high-pressure cleaning preformed at? ,000 psig At what psig is high-pressure waterjetting preformed at? 7-2 10,000-30,000 psig At what psig is ultrahigh-pressure waterjetting preformed at 7-2 above 30,000 psig What does waterjetting not create? 7-1 An anchor profile In the marine industry, waterjetting is widely used for what purposes? 7-1 Removal of marine growth, depleted antifouling coatings and surface preparation of tank/hold interiors What industries is waterjetting particularly well suited for? 7-1 Marine, process and utility industries. What standard specifies the amount of non visible contaminants that are allowed to be left on the surface? 7-5 None. If the coating specification does not require testing, the inspector should not request the contractor to do so or do so on his own accord. What parts does a commercial waterjet unit consist of? 7-6 pumps, hoses, prime mover, and various tools such as guns, nozzles and lances What should the minimum burst strength of high-pressure equipment be? 7-7 2 1/2 times the capability of its maximum-rated operating strength. What is the safety device that high-pressure hoses are fitted with? 7-7 whip-lock or whip check What is the section of hose next to the gun fitted with? 7-7 hose shroud What are the two basic categories that waterjetting equipment fall into? 7-7 Manual & Robotic What category does the majority of waterjetting fall into? 7-8 manual What is the effect when waterjetting at pressures lower that 10,000psig? loose rust, debris, and material in depressions and pits are removed but magnetite remains. A matte finish is not achieved. Describe what robotic waterjetting is. 7-8 It is a cleaning vehicle that attaches itself, using vacuum, cables or magnet to a vertical, horizontal or overhead surfaces. What type of waterjetting collects 95% of water, removed coatings and rust? 7-8 Robotic waterjetting What is waterjetting effective for removing? 7-10 Surface oil & grease Rust Concrete splatter Existing coatings Describe two of the considerations with regards to "back thrust". 7-18 fatigue & 1/3 of body weight for an extended period of time. A round jet can produce waterjest at what psig? 7-11 35,000 Round jets are used for what purpose? 7-12 cutters Fan jets are used for what purpose? 7-12 scrapers andor pushers What is the typical water flow rate? 7-12 1 to 4 gal/min What is the effect when waterjetting at 10,000 psig? a uniform matte finish is obtained and the black oxide is removed but at a rate too slow to be considered practical. What is the effect when waterjetting at 34,000 to 36,000 psig? a uniform matte finish is obtained. Surface materials, including most mill scale are removed. What is the effect when waterjetting at 20,000 psig? a uniform matte finish is obtained. Black oxide, paint, elastomeric coatings, enamel, red oxide, and polypropylene sheet finish are removed. Chemical contaminants will be removed, but with varying degrees of effectiveness. At what distance should the tip be held from the surface when removing mill scale and rust scale? 2 inches Before beginning work, what should the waterjet team ensure be done? Area properly barricaded Electrical equipment properly covered Electrical connections are not in water All fittings and hoses are in good condition Nozzles are open and free of obstructions System is flushed clean and air removed All moving equipment are mechanically disabled List some advantages of waterjetting over dry abrasive blasting. Less dangerous for crew Better air quality Respiratory requirements are less stringent No dust contamination Less damaging to environment Cost efficient Requires less clean up List some disadvantages of waterjetting over dry abrasive blasting. Surface must have a prior profile Equipment is very expensive Dangers of a breached UHP hose Danger of water injection Collection &disposal of the contaminated water Lack of proficient operators In addition to inspection and testing, list what the inspector may also be required to do. Monitor clean-up Ensure water run-off is collected, treated and disposed of properly Document carefully each phase of operation