API 570 open book.pdf
- 1. 1- Which of the following refinery piping system may be excluded from the specific requirement of API 570 ? 1. An NPS 4 catalyst line . (API 570-1.2.1) 2. A 3/4 ‘’ OD tubing gasoline sampling line . 3. An NPS 3 crude oil line operating at 110 ° F . 4. A 1’’ OD tubing gas line . 2- For pipe exceeding 10’’ in diameter, a test point is an area defined by circle of diameter not greater than 1. 1’’. 3. 2.5’’ (API 570-3.1.20) 2. 2’’. 4. 3’’ 3- An NPS 8 pipe operates at maximum of 675 psi and temperature ----700° F--- ASTM A106 GB material. What allowable stress should be used to determine the thickness? 1. 16,500 psi. 3. 17,300psi. (B31.3-Table A-1) 2. 17,000psi. 4. 20,000psi. 4- In the guided bend test used to qualify WPS , crack occaure on specimen are acceptable: 1. Only if they are not associated with the test weld. (ASME IX-QW-163) 2. Under no circumstances. 3. If there is no evidence that they were due to slag inclusion. 4. If the transverse opening is not larger than 1/8’’. 5- Which of the following is not an acceptable temporary repair for 12’’ steel pipe with localized corrosion? 1- 8’’ circular patch. (API-Figure C.2) 2- 6’’ X 6’’ square patch with corner . 3- 6’’ circular patch. 4- 6’’ X 6’’ square patch with corner . 6- A piping system has a design pressure of 500 psig and design temperature 482°c what is the minimum acceptable flange class if the flange material ASTM A105 ? 1. Class 300. 3. Class 600. By material group and pressure and tempreture B16.5 2. Class 400. 4. Class 900.
- 2. 7- The maximum depth of undercut allowed for a girth weld made in normal service for 13mm thickness 1. No visible undercut. (B31.3-Table 341.3.2) 2. 1/32’’ (1mm). 3. 1/16’’(1.5mm). 4. 1/8’’(3mm). 8- The maximum surface temperature for dry magnetic particle testing of weld: 1. Set by the manufacturer of the examination medium. (ASME V T-731-c) 2. 250°F. 3. Limited by the permeability of the magnetic particle. 4. 600°F. 9- In evaluating a thinned area of piping. The allowable stress shall be : 1. ½SMYS (specified minimum yield strength). 2. 2/3 of SMYS (specified minimum yield strength). 3. 90% of the SMYS (specified minimum yield strength). 4. 75% of SUTS (specified ultimate tensile strength). 10- Which of the following is the maximum allowable working pressure conditions of 380 psig at 700°F° ,the material is A53 Grade B ,thickness is 0.28’’ corrosion rate is 0.005 inch per year from now? 1. 337 psig. Missing data are Diameter, Next planed inspection 2. 380psig. MAWP=2St/OD , 3. 390psig. t= measured thickness-2corrosion Rate *next interval inspection 4. 400psig. 11- A piping system has the following conditions: NPS 10, OD:10 ¾’’ , A106 GB, allowable stress :20000psi, weld efficiency :E =1, thickness :0.3’’(from inspection) , corrosion rate :0.02 inch per year Next planned inspection : 5 years MAWP=2St/OD What is the maximum allowable working pressure of this system? 1. 372psig. MAWP=2*20000*(0.3-2*0.02*5)/10.75= 372psig 2. 744psig. 3. 1041psig. 4. 1116psig.
- 3. 12- To verify continuous corrosion control of poorly coated pipes where cathodic protection are inconsistent, a close-interval potential survey may be conducted every: 1. 6 months. (API 570- 9.3.2) 2. 2 year. 3. 3 years. 4. 5years. 13- Threaded carbon steel piping in an NPS 1 ½’’ piping system in normal service replaced. What is the minimum pipe schedule to be used? ( B31,3-Table 314.2.1) 1. Schedule 40. 2. Schedule 60. 3. Schedule 80. 4. Schedule 160. 14- The density of the step wedge comparison films and densitometer calibration comparison with a calibrated step wedge film traceable to: 1. An ASME code, Section V certified film. (ASME V-T-262.1) 2. An ASNT certified step wedge. 3. An ASNT certified procedure. 4. A national standard. 15- Which inspection method is suitable for locating corrosion cell, galvanic coating problems, underground contacts, and areas of low pipe to soil potential: 1. Soil resistivity testing. (API 574- 10.10.1.2) 2. close-interval potential surveys. 3. Particle examination. 4. pipe coating Holiday survey. 16- When reviewing a group of radiographs, all of the following information must be available except. 1. Minimum source to film distance. (ASME V- T-292) 2. Geometric unsharpness. 3. Material type. 4. Exposure technique. 17- Which of the following may be assumed in computation made when calculating maximum allowable working pressure for unknown material? 1. Highest grade material. (API 570- 7.2) 2. Average grade material. 3. Carbon steel material. 4. Lowest grade material.
- 4. 18- A piping system made of mixed grades of piping including A-53 carbon steel with silicon killed elbows and fittings, has recently been rerated from 400°Fto 500°F.the processes fluid contains 0.52% weight sulphur. The unit inspector should : 1. Increase number of TML on the system . 2. Continue monitoring the system utilizing existing TML if they have 0.002inch per year Corrosion rates. 3. Relocate the TML to the fittings. 4. Not be concerned with the 100°F change. 19- What is the minimum required of thickness (tm)(including corrosion allowance c =0.02 )NPS 4 inch if it operates at 525psi at 400°F ,material is API 5L A25 ERW IS C.A 0.0625 inch 1. 0.099 inch. 2. 0.147 inch. 3. 0,150inch. 4. 0.161inch. 20- A buried piping designed for 100 psi (0.689MPa)service is hydrostatical 125PSI(0.861MPa) for 8 hours, after 4 hours the pressure has dropped 5psig and pumped back up to 125psig (0.861MPa) .during the remaining 4 hours the pressure drops by 5psi (0.03MPa) ,according to instructions in API standard 570 the inspector should 1. Accept the test. 2. Evacuate the pipe and conduct an external visual inspection. 3. Reject the test and conduct further inspection. 4. Visually inspect the pipe and find the leak. 21- Piping system is designed for 300 psig at 700°F the allowable stress value at test 20,000 psig the allowable stress value at design temperature is 15,000 psig . which of is pneumatic test pressure? 1. 330 psig. 2. 440 psig. 3. 450 psig. 4. 600 psig. 22- What is the maximum BRINELL hardness number allowed when welding pipe using P6 material ? 1. BHN 200. (B31.3- Table 331.1.1) 2. BHN 225. 3. BHN 241. 4. Hardness testing is not required for this material.
- 5. 23- In general, the corrosion resistance of iron and nickel alloys in sulfidation atmospheric is depend upon the content of : 1. Molybdenum. (API 571- 5.1.1.5.6) 2. Chromium. (API 571- 4.4.2.6) 3. Nickel. 4. Niobium or Titanium. 24- Reheating of hardened metal to a temperature below the transformation range improper toughness is known 1. Stress relieving. (B31.3-300.2-h) 2. Tempering. 3. Annealing. 4. Normalizing. 25- Which of the following is the standard height of the raised face section of class 400 FF flange: 1. 0.060 inch(2mm). 2. 0.100 inch(2.5mm). 3. 0.125 inch(3mm). fig 7 b16.5 4. 0.250 inch(7mm). 26- Which of the following factors does not contribute to galvanic corrosion : 1. An electrical connection. 2. Anode and cathode. 3. Service temperature between 212°F to 250°F. 4. Presence of an electrolyte. 27- The most extensively used NDE method for welds is: 1. PT. 2. VT. 3. RT. 4. MT. 28- The rate of corrosion under insulation will usually not increased by insulator: 1. Contain chloride salts. 2. Do not utilize vapour barrier. 3. Wick moisture. 4. Are made of closed-cell foam glass.
- 6. 29- When cracking is suspected and an internal visual inspection reveals no indication of cracks which of the following testing method is not recommended by API RP 574 to use as spot crack check? 1. MT. 2. PT. 3. UT. 4. RT. 30- Plate material can be used only for which of the following flanges? 1. Class 150. 2. Threaded. 3. Blind. 4. Class 150 and Class 300 up to NPS ½. 31- An inspection reveals that a repaired NPS 4 seamless pipe ,A53 G B, has the thickness of .180 inch.if service is 1000psig at 500°F, what is the actual remaining corrosion allowance) , considering only internal pressure? 1. 0.043 inch. 2. 0.064 inch. 3. 0.070 inch. 4. 0.116 inch. 32- When unexpected movement of piping system is observed, what should the inspector do to evaluate the problem? 1. Increase the frequency of inspection. 2. Check the piping stress analysis. (API 570- 7.5) 3. Develop an inspection plan. 4. Discuss these observations with a piping engineer. 33- An ASTM A 106 G B NPS 10 pipe with a wall thickness of 1.125 inch must have a section replaced what preheat is recommended? 1. None. 2. 50°F. (B31.3- Table 330.1.1) 3. 175°F. 4. 200°F. 34- Which of the following is a predominant factor in mechanical fatigue crack? 1. Operating equipment past remaining life. 2. Impact toughness. (API 571- 4.2.16.3) 3. Low stress stamping. 4. Surface notches.
- 7. 35- To inspect for CUI ,an insulated stainless steel class 1 system operating 450 F required what percentage of follow up examination at areas with damaged insulation. 1. O % 2. 25% 3. 50% 4. 75% 36- What is the maximum permissible height of weld reinforcement for a girth weld in sever cyclic condition piping having wall thickness 3/8 inch 1. 1/16 inch 2. 1/8 inch 3. 5/32 inch 4. 3/16 inch 37- Chloride stress corrosion crack of 300 series SS generally occur above about: 5. 100°F (38°C). 6. 140°F (60°C). (API 571-4.5.1.3-g) 7. 180°F (82°C). 8. 212°F (100°C). 38- Insert repair patches may be of any shape but must : 1. Have a test hole. API 570- 8.1.4.2-c) 2. Be of double the pipe thickness. 3. Be 1.5 times the minimum stress of the original material. 4. Have rounded corner. 39- With respect to piping systems for which service condition have been changed if data for the same or similar service are not available, a corrosion rate for a piping circuit is estimated from the experience of the owner/operator or from: 1. Published data on piping systems in comparable service. 2. The highest known corrosion rate on the unit. (API570- 7.1.2-b) 3. ‘’worst case’’ industry data. 4. A default corrosion rate of 10 mils per year (0.01 inch per year). 40- A welding discontinuities is: 1. A condition of being imperfect a departure of a quality characteristic from its intended condition. 2. A lack of cohesion an interruption in the normal physical structure. 3. An imperfection or unintentional non-conformance that is dectable by NDE . 4. The response or evidence from the application of NDE.
- 8. 41- What is the nominal plate thickness required for a permanent blank made from A-36 plate (E =1) for a flange connection with a design pressure 300 psi at 400°F with total Cross ion allowance .125 inch ,and gasket inside diameter of 12.5? 1. 0.625 inch. 2. 0.750 inch. 3. 0.875 inch. 4. 1.000 inch. 42- An NPS 12 carbon steel standard wall pipe in (class2) ,pressure 450 psig (3.1 MPa) and 500°F with an allowable stress 20,000 psi at inspection of 0.28 inch .what is the maximum interval for the next thickness measurement inspection if no RBI analysis has been performed ? E =1 , corrosion rate 0.025inch per year. 1. 2.7 years. (half the remaining life or Acc to table2 whichever less) 2. 3.0 years. 3. 5.0 years. 4. 5.5 years. 43- The size of fillet weld refers to the dimension of the weld? 1. Throat. 2. Leg. 3. Reinforcement. 4. Toe. 44- Subject to specific approval of the inspector, welding procedures qualified by others may be used provided that all of several conditions are met. One of this condition is that : 1. The employer has made only slight changes to the WPS. 2. The employer has not made any change in the welding procedure. 3. The base material P number is either 1, 3, 4 GR # 1 or 8and impact testing is required . 4. The material to be welded is not more than 1 inch thick and requires PWHT. 45- During inspection for CUI ,an insulated austenitic stainless steel class 1 piping system operating at 300°F would require what percentage of following –up examination at areas with damage insulation? 1. 0 %. 2. 25 %. 3. 50 %. 4. 75 % C SE P dg tm 16 3
- 9. 46- The number of TML required on high-temperature hydrocarbon lines containing sulphur corrosives are often fewer than on other corrosive system because the Sulfur lines (API 570- 5.6.3) 1. Exhibit very uniform corrosion independent of location in the system. 2. Are not considered to be a potential environment risk. 3. Corrode at such a fast rate that they are considered consumable and are rep---- predetermined time schedules. 4. Are constructed of high –alloy materials that are unlikely to erode. 47- Which discontinuity is normally found at the weld toe or root surface? 1. Underfill. 2. Concavity. (API 577- Table 2) 3. Overlap. 4. Incomplete fusion.