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Terms in this set (62)
In most cases, brittle fracture occurs only at what temperatures?
below the Charpy Impact transition temperature
A carbon steel storage tank is operating at a temperature of 125°F. It is storing 90% sulfuric acid. What is the anticipated corrosion rate?
A carbon steel storage tank is storing Sour Water. What pH does a thin iron sulfide layer limit the corrosion rate?
above a pH of above 4.5
What must be done to accommodate the operating parameters for the vapor recovery system on tanks, such as a fixed cone roofs, umbrella roofs, and vapor dome roofs?
adjustment in relieve value settings will be required
Hemispheroid, spheroid, and noded spheroid tank types are commonly used for:
pressures above about 5 5 lbf/in.2 gauge
Which weld examination device can be used to determine the weld preparation angle prior to welding?
bridge cam gauge
If a residual field is left in a partially completed weld, what may happen during weld deposit?
deflect the weld arc
How far shall a drip ring extend beyond the outer periphery of the foundation ringwall?
What is the minimum nominal thickness of carbon steel anchor straps?
What materials in the flush-type cleanout fitting assembly must conform to the requirements in API 650 Section 4?
What is the maximum size fillet weld on the top side of a frangible roof?
A hydro is being performed on a storage tank that has a bottom shell course thickness of 5/8". At what point does it require a maximum fill rate of 12 in/hr?
when filling the top course
How much spot radiography is required when plate thickness is < 1"?
one spot in first 10'
Support legs shall provide at least how much clearance (in the high roof position) between the roof and the tank bottom, unless specified otherwise?
Permeability of the leak detection barrier shall not exceed
4 × 10-5 mils per second
What may provide information about the corrosivity of the material used under and around a tank?
What dry film thickness are inorganic zinc coatings typically applied to internal tank surfaces?
3 - 5 mils
Repairs of a new liner should be performed after what kind of testing?
What is the typical anchor pattern required for liners?
1.5 - 4 mils
Maximum allowable settlement Bew is shown in Figure B.11 for settled areas that include bottom lap welds essentially:
parallel to the shell (±20°)
Maximum allowable settlement Be is shown in Figure B.12 for areas of edge settlement with no welds, butt welds, or lap welds in the bottom that are essentially:
perpendicular to the shell (±20°)
When inspecting a swing line, what are scribe marks used for?
checking the joint's freedom of movement
If the calculated angle of a swing line exceeds 65° what is recommended?
installation of a limiting bracket
When determining whether the candidate tank is in similar service as the control tank, what two Ambient Condition factors must be assessed?
low one day mean temperature
exposure to salt air or other corrosive elements
When must areas that are pitted on a floating roof be repaired or replaced?
if through-pitting is likely to occur prior to the next scheduled internal inspection
When evaluating a LTA, profile measurements shall be taken along which plane?
What do shell distortions include?
out-of-roundness, buckled areas, flat spots, dents, and peaking and banding at welded joints
During a change of service, when can the service be considered more severe and create a greater risk of brittle fracture?
if the service temperature is reduced, or the product is
changed to one with a greater specific gravity
When is butt welding to an adjacent existing patch not permitted?
in the critical zone
For welds made by SMAW, after completion of welding and without allowing the weldment to cool below the minimum preheat temperature, the temperature of the weldment shall be raised to a temperature of 260 °C ±30 °C (500 °F ±50 °F) for a minimum period of two to four hours to assist out-gassing diffusion of any weldmetal hydrogen picked up during welding.
What is this treatment called?
What NDE methods shall be used on completed welds attaching nozzle neck to shell, and reinforcing plate to shell and to nozzle neck welds?
magnetic particle or liquid penetrant
When must completed welds of stress-relieved assemblies be examined by the magnetic particle or liquid penetrant methods?
after stress relief, but before hydrostatic testing
How shall welds of permanent attachments (not including shell-to-bottom welds) and areas where temporary attachments are removed and the remaining weld projections have been removed, be examined?
In what material groups shall completed welds of new permanent attachments (not including shell-to-bottom welds) and areas where
temporary attachments have been removed, be examined by the magnetic particle method (or, at the option of the Purchaser, by the liquid penetrant method)?
IV, IVA, V, VI
Who must perform a fitness-for-service evaluation?
engineer experienced in storage tank design and the evaluation methodologies used
How long must radiographs be retained?
When qualifying either a procedure or an examiner, who proves up the indications, the examiner must be able to determine the flaw depth to what degree of accuracy, on uncoated tank bottom?
Welded-on patch plates shall not be placed over areas of the tank bottoms that have:
Testing for holidays on a lining that has been in service:
not typically recommended
For what period of time are ultrasonic shear wave operators qualified?
Up to what temperatures do atmospheric corrosion rates continue to increase?
CUI corrosion becomes more severe at what temperature?
212°F - 350°F
MIC is often found where?
heat exchangers, bottom water storage tanks, piping with stagnant or low flow, and piping in contact with soil
CS and 300 SS have serious corrosion problems in high strength caustic solutions above what temperature?
Sulfuric acid corrosion: 80% sulfuric acid operating at 125°F can produce a corrosion rate of:
What are the most common types of atmospheric storage tanks?
fixed cone roof tanks, umbrella roof tanks, and floating-roof tanks
What weld joints would UT inspection method be applicable for?
Butt, Corner, Tee
What inspection methods would be applicable for a Butt joint?
RT, UT, PT, MT, VT, ET, LT
Equipment used in inspection of a 10 mil liner:
low voltage holiday
Advantage of galvanic anode systems:
no external power supply is required
A sealing system that uses metal against the shell:
What can plugage of floating roof drains cause?
What type of NDE is required on welded scaffold clips that have been removed after construction?
What should be considered when deciding to install a CP system? 220.127.116.11
Guides and stabilizers on floating roof prevent what?
Who should be consulted when a course is being added to the top of tank and significant external loads are expected? 18.104.22.168
Thick film coating are defined as?
How much RT is required on an insert plate with a nozzle? 9.8.6 & 22.214.171.124.2
How far must a lap patch overlap a vertical seam?
What is the max size of a shell lap patch?
48" x 72"
A new tank floor is being added, what is the minimum distance between an existing reinforced nozzle weld and the new shell to bottom weld ?
A new tank floor is being added, what is the minimum distance between an existing nozzle weld and the new shell to bottom weld ?
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