Descripción: Examen unidad 9 del libro de inglés highfive 1 1º eso
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API 510. DAILY EXAM 9 (Closed book) Note: Encircle the letter of only one answer which you think is most appropriate.
1.
Cracks are likely to occur in or adjacent to welded seams in which of the following vessels? a. b. c. d.
2.
If alloy steels have undergone “temper embrittlement”, embrittlement”, the appropriate testing to confirm the same is: a. b. c. d.
3.
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The API authorized pressure vessel inspector may give prior authorization for repairs that do not involve: a. b. c. d.
5.
Hardn ardne ess tes testin ting Impact testing Ductil ctilit ity y tes esti ting ng Tens Tensil ile e stre streng ngth th test testin ing g
The rules for impact testing of carbon steel in Section VIII vessel materials require what kind(s) of impact test? a. b. c. d.
4.
Vessels Vesse ls co const nstruc ructed ted of high high stren strength gth steels steels (above 70,000 psi) Vesse Ve ssels ls made made from from coa coarse rse grain grain steels steels Vesse Ve ssels ls made made of low chrom chrome e materi materials als and operating at high temperature All of the above
Pressure tests Radiography Pneu Pn euma mati tic c test testin ing g of pads pads Fina Finall visu visual al insp inspec ecti tion ons s
Prior to witnessing a pneumatic test of a pressure vessel, the inspector should: a. b.
Ensure Ensure that welds welds around around nozz nozzles les were inspecte inspected d by PT or MT prior to commencement of test. Ensure Ensure that test pressure pressure is maintaine maintained d througho throughout ut the leak testing inspection. D:\Documents D:\Documents and Settings\Administrator\D Settings\Administrator\Desktop\IRS-510esktop\IRS-510-JanJan- 06\IRS-510-VOLUME-1\Daily 06\IRS-510-VOLUME-1\Daily Quiz, Answer keys\API_510_PC_20_31_Aug05_Exam_9_Closed.doc 1/11/2006 / 9:24:21 PM / NCD
c. d. 6.
Ensure that all butt welds were UT checked prior to commencement of test. Both a and b
Widely scattered pits may be ignored as long as the following conditions are satisfied: i. Thickness at bottom of pits is greater than one half the vessel’s required wall thickness ii. The total area of the pits does not exceed 7 square inches (45 square centimeters) within any 8-inch (20-centimeter) diameter circle. iii. The sum of their dimensions along any straight line within the circle does not exceed 2 inches (5 centimeters). iv. ? What is the missing item in “iv” above? a. b. c. d.
7.
The thickness at bottom of pit must be measured by pit gauge. The 8”diameter is to be measured from the center of the deepest pit. There are no missing items; there are only 3 items to be considered The total area of the pits cannot exceed 3.5 square inches in a 4-inch diameter circle.
Before any repair to a pressure vessel in accordance with its code of construction, what if any additional requirements (over and above those in API 510) may need to be considered? a.
8.
Jurisdictional requirements that might override the API 510 Code. b. Is repair being done by repair organisation? c. The quality of the repair materials. d. The need for qualified welding procedures. Reduction in likelihood of brittle fracture can be obtained by performing a. b. c. d.
A first internal inspection A first internal inspection, however if a manufacturer’s data report (U1) assuring that the vessel is satisfactory for its intended service is available the first internal inspection may be waived. Base line thickness readings must be taken per OSHA 1920 (j). Base line thickness reading must be taken per OSHA 1910 (j).
Ordinarily non-metallic coatings and linings effectively inspected by what technique?
can
be most
a. Low voltage holiday tester b. Radiography c. Hammer testing d. Using a high voltage low current brush type electrode device. (Spark Tester) 11.
Titanium alloys are subject to loss of ductility in certain environments, what is this condition called? a. b. c. d.
12.
Which of the following describes a crack in metal? a. b. c. d.
13.
Cracks run parallel to the surface. Cracks run at right angles to the surface. Cracks are usually wide at one end and narrow at the other. Cracks always run slant to the surface.
Temper embrittlement is best described as: a. b. c. d.
14.
High temperature embrittlement Low temperature embrittlement Hi-alloy effect Hydriding
Cracking due to operating at high temperatures above 700°F Loss of ductility and notch toughness due to exposure above 700°F Flaking of the metal surfaces, causing dip pits Cracking due to low temperature service
Erosion/Corrosion mitigation can be achieved by a. b. c. d.
16.
Overheating Erosion Corrosion Cracks
The inspection of a vessel to determine if a hydrogen blister is present is often best performed by: a. b. c. d.
18.
Increasing the pipe diameter to decrease velocity Increasing surface hardness by using harder alloys or hard facing Using corrosion resistant alloys All of the above.
Which of the following is a major concern when operating vessels that utilize the slurries with solid suspensions? a. b. c. d.
17.
Branching, Transgranular and initiate from within the material. Dagger shaped, intergranular and initiate form within the material. Dagger shaped, oxide filled and initiate form the surface. Dagger shaped, clean and intergranular .
Researching the inspection records Determine the vessels material to see if hydrogen attack is likely Swaying a flash light parallel to the vessel’s surface Recommending metallurgical tests for blisters in a laboratory
When preparing to inspect a vessel which has had previous inspections what is the initial step in preparation for the inspection? a. b. c. d.
Assemble all the required tools to perform the inspection. Review previous inspection records. Advice maintenance of any anticipated repairs. Insure that all non-destructive examinations required have been scheduled.
Which of the following best describes a “Corrosion Button” as might be found in a pressure vessel? a. b.
c. d.
20.
Buttons made of highly corrosion resistant material from which corrosion loss can be measured. Buttons which corrode at about the same rate as the vessel’s material and are used to estimate the vessel’s corrosion losses. No such thing exists; there is however a corrosion tab used in vessels. A form of corrosive product produced by certain chemicals in a vessel when is constructed of high chrome alloy material.
In a PRV in which the major relieving device or main valve is combined with and controlled by a self activated auxiliary pressure relief valve is: a. b. c. d.
Pilot operated valve Bellow type balancing valve Relief valve Safety valve
