Pressure Vessel Exam Questions

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I. True or False Questions (Mark √ for correct and × for incorrect in the brackets.) There are 35 questions in total, 1 point for each question, for a total of 35 points. 1. The Work Safety Law of the People’s Republic of China stipulates that the list of special equipment that involves life safety and poses high risks shall be formulated and approved by the department responsible for the supervision and management of special equipment safety under the State Council. ( ) Answer: × Index: Article 30 of the Work Safety Law of the People’s Republic of China. 2. TSG Z7001—2004, Rules for the Approval of Special Equipment Inspection and Testing Institutions, applies to the approval of special equipment inspection and testing institutions such as comprehensive inspection institutions, type testing institutions, non-destructive testing institutions, and gas cylinder inspection institutions. ( ) Answer: × Index: Article 2 of TSG Z7001—2004 \"Rules for the Approval of Special Equipment Inspection and Testing Institutions\". 3. The \"Requirements for Licensing the Manufacturing of Boilers and Pressure Vessels\" set out requirements regarding the resources necessary for licensing the manufacturing of boilers and pressure vessels, but do not specify any requirements for the resources needed to license the manufacturing of safety accessories. ( ) Answer: × Index: Chapter 6 of the \"Requirements for Licensing the Manufacture of Boilers and Pressure Vessels\"; 4. In accordance with the provisions of the \"Provisions on the Supervision and Management of Imported Boilers and Pressure Vessels in the People’s Republic of China (Trial Version)\", regarding the supervision and inspection of boilers and pressure vessels that are manufactured in China on behalf of foreign parties as part of imported complete sets of equipment, it is principle that the foreign party shall designate a qualified inspection agency to carry out such inspections. After the goods arrive at the site, they can be re-inspected by an inspection unit authorized by the safety supervision agency. ( ) Answer: × Reference: Article 11 of the \"Provisions of the People’s Republic of China on the Supervision and Management of Import and Export Boilers and Pressure Vessels (Trial)\"; 5. The \"Regulations on the Safety Supervision of Special Equipment\" stipulate that special equipment inspection and testing institutions shall submit to the safety supervision authorities for special equipment the oversight and inspections carried out in accordance with the law. ( ) Answer: √ Reference: Article 5 of the Regulations on the Safety Supervision of Special Equipment; 6. The Rules for the Examination and Management of Welders in Boilers, Pressure Vessels, and Pressure Pipelines divide the examinations of welders’ welding skills into those for manual welders and those for welder operators. ( ) Answer: √ Reference: Article 8 of the \"Rules for the Examination and Management of Welders Working on Boilers, Pressure Vessels, and Pressure Pipelines\". 7. According to JB/T 4745—2002 \"Welded Titanium Vessels\", titanium pressure vessels with a design pressure of 1.6 MPa or less do not require the preparation of product welding test plates on a per-vessel basis. ( ) Answer: × Index: JB/T 4745—2002 \"Welded Titanium Vessels\" 10.4.1.1; 8. The \"Regulations on Safety Supervision of Pressure Vessels\" stipulate that when heat-treating spherical storage tanks, the difference between the highest and lowest temperatures in the heating area should not exceed 65°C. ( ) Answer: × Reference: Article 73 of the \"Regulations on Safety Supervision of Pressure Vessels\". 9. The TSG R0002─2005 \"Regulations on Safety Supervision of Ultra-high Pressure Vessels\" stipulates that welded joints should be used for the forged pressure components of ultra-high pressure vessels. ( ) Answer: × Index: TSG R0002─2005 \"Regulations on Safety Supervision of Ultra-High Pressure Vessels\", Article 36. 10. JB 4744—2000 \"Inspection of Mechanical Properties of Welded Test Plates for Steel Pressure Vessel Products\" stipulates that if the tensile and bending tests on the welded test plates of a product fail, retesting is permitted. For non-conforming items, double the number of samples shall be taken for re-inspection. ( ) Answer: √ Index: JB 4744—2000 \"Mechanical Property Tests of Welding Test Plates for Steel Pressure Vessels\", 9.1 11. TSG R0001─2004 \"Regulations on Safety Supervision of Non-metallic Pressure Vessels\" stipulates that graphite-based non-metallic pressure vessels, fiberglass-reinforced plastic pressure vessels, and fully plastic pressure vessels must undergo a comprehensive inspection at least once every 3 years. ( ) Answer: × Index: TSG R0001─2004 \"Regulations for the Safety Technical Inspection of Non-metallic Pressure Vessels\", Article 76, Appendix 8. 12. GB/T 232—1999 \"Metallic Materials – Methods of Testing for Bending\" specifies that the specimen should be machined to remove any parts whose properties have been affected by processes such as shearing or flame cutting. ( ) Answer: √ Index: GB/T 232—1999 \"Metallic materials – Methods of bending test\", 6.1. 13. In accordance with the provisions of TSG R7001―2004 \"Rules for periodic inspection of pressure vessels\", if the failure in the pressure resistance test is due to defects in the vessel itself, it can be classified as grade 5. ( ) Answer: √ Index: Article 48 of TSG R7001―2004 \"Rules for Periodic Inspection of Pressure Vessels\". 14. GB 150—1998 \"Steel Pressure Vessels\" stipulates that the temperature of the liquid used in the hydrostatic test of low-temperature vessels should be no lower than the impact test temperature of the vessel’s material and welding joints (the higher of the two values), plus 20°C. ( ) Answer: √ Index: Appendix C, C4.7 of GB 150—1998 \"Steel Pressure Vessels\"; 15. GB 151—1999 \"Shell and Tube Heat Exchangers\" requires that the heat exchange tubes after being butted together should be subjected to a hydraulic test one by one, with the test pressure being 1.5 times the design pressure. ( ) Answer: × Index: GB 151—1999 \"Shell and Tube Heat Exchangers\" 6.3.3 (g) 16. In accordance with the provisions of JB 4732—1995 \"Steel Pressure Vessels – Analysis and Design Standards\", at least one product welding test plate must be prepared for each vessel. When a Class A welded joint of a vessel (excluding the Class A welded joints where the spherical head is connected to the cylinder) is to be welded using several welding processes, a test plate must be prepared for each welding process. ( ) Answer: √ Index: JB 4732—1995 \"Steel Pressure Vessels – Code for Analytical Design\", 11.5.1.1 17. In accordance with the provisions of JB/T 4731－2005 \"Steel Horizontal Vessels\", when the saddle supports of a horizontal vessel are welded to the vessel, one of those supports should be of a sliding or rolling type. ( ) Answer: √ Index: JB/T 4731–2005 \"Horizontal Steel Vessels\" 6.1 18. In accordance with the requirements of JB/T 4734–2002 \"Welded Aluminum Vessels\", the oxide film and grease on the surface of the welding wire and the groove must be removed before welding aluminum vessels; this is typically done through chemical cleaning or mechanical cleaning methods. ( ) Answer: √ Index: JB/T 4734-2002 \"Aluminum Welded Containers\" E3.3 19; the \"Rules for Supervision and Inspection of Safety Performance of Boiler and Pressure Vessel Products\" do not apply to the supervision and inspection of ultra-high pressure vessel products. ( ) Answer: × Index: Article 2 of the \"Rules for Supervision and Inspection of Safety Performance of Boiler and Pressure Vessel Products\". 20. In accordance with the provisions of JB/T 4750—2003 \"Pressure Vessels for Refrigeration Equipment\", ammonia storage vessels made of 16MnR material shall undergo post-weld heat treatment. ( ) Answer: √ Index: JB/T 4750—2003 \"Pressure Vessels for Refrigeration Equipment\" 9.4.1 21. In accordance with the provisions of the \"Regulations on the Registration and Management of the Use of Boilers and Pressure Vessels\", the user unit shall apply to the local registration authority for registration before each pressure vessel is put into use or within 30 days after it is put into use, in order to obtain a registration certificate. ( ) Answer: √ Reference: Article 6 of the \"Regulations on the Registration and Management of the Use of Boilers and Pressure Vessels\". 22. JB/T 4781–2005 \"Liquefied Gas Tank Containers\" stipulates that for liquefied gas tank containers used to store and transport media with a high or extremely high degree of toxicity, the openings of the tanks must not be located below the horizontal midline of the tank. ( ) Answer: × Index: JB/T 4781–2005 \"Liquefied gas tank containers\" 6.3.17. 23. JB/T 4700—2000 \"Classification and technical requirements for pressure vessel flanges\" stipulates that the welds joining the flanges must be subjected to 100% radiographic or ultrasonic inspection. ( ) Answer: √ Index: JB/T 4700—2000 \"Classification and Technical Requirements for Pressure Vessel Flanges\" 6.6.1.1 24. In accordance with the requirements of the \"Regulations on the Safe Management of Medical Oxygen Chambers\", the installation of medical oxygen chambers shall be carried out by the manufacturer of such chambers. ( ) Answer: √ Index: Article 23 of the «Regulations on the Safety Management of Medical Oxygen Chambers». 25. GB/T 19624–2004 «Safety Assessment of Defective Pressure Vessels in Service» is not applicable to the safety assessment of pressure-bearing components with volumetric defects (including pits, pores, inclusions, undercutting with a depth of less than 1 mm, etc.). ( ) Answer: × Index: GB/T 19624－2004 \"Safety Assessment of Defective Pressure Vessels in Use\" 1 26. The \"Regulations on the Safety Supervision of Gas Cylinders\" stipulate that gas cylinder filling units may only fill cylinders that are in their own ownership (with the exception of vehicle-use cylinders, breathing apparatus cylinders, fire-fighting cylinders, non-refillable cylinders, and other cylinders approved by the safety supervision agencies of provincial quality supervision departments), and shall not fill cylinders whose technical records are not kept by such filling units. ( ) Answer: √ Reference: Article 29 of the «Regulations on the Safety Supervision of Gas Cylinders». 27. JB/T 4746—2002 «End Caps for Steel Pressure Vessels» stipulates that there shall be no longitudinal wrinkles in the straight edges of oval, disc, and folded-cone end caps. ( ) Answer: √ Index: JB/T 4746—2002 \"End closures for steel pressure vessels\" 6.3.9 28. In accordance with the provisions of JB/T 4780—2002 \"Liquefied natural gas tank containers\", the inner container of an LNG tank container shall be equipped with at least 2 full-opening safety valves that are connected in series and can be switched between each other. ( ) Answer: × Index: JB/T 4780—2002 \"Liquefied natural gas tank containers\" 5.3.11.3 29. GB 13004－1999 \"Periodic inspection and evaluation of steel seamless gas cylinders\" stipulates that linear defects on the external surface or sharp mechanical damage detected during inspection should be ground so that their edges have a smooth transition; however, the wall thickness after grinding must be greater than 90% of the designed wall thickness. ( ) Answer: √ Index: GB 13004–1999 \"Periodic Inspection and Evaluation of Steel Seamless Gas Cylinders\", 5.1.2; 30. JB 4708—2000 \"Welding Procedure Qualification for Steel Pressure Vessels\" stipulates that a welding procedure that has been found to be suitable for evaluating butt welds in tubes is not applicable to butt welds in plates. ( ) Answer: × Index: JB 4708—2000 \"Welding Procedure Qualification for Steel Pressure Vessels\" 5.1.1 31. In accordance with the provisions of JB/T 4730.1—2005 \"Non-destructive testing of pressure equipment – Part 1: General requirements\", linear defects refer to defects such as pores, inclusions, and tungsten inclusions whose aspect ratio is 3 or greater. ( ) Answer: × Index: JB/T 4730.1—2005 \"Non-destructive testing of pressure equipment – Part 1: General requirements\" 3.9 32. In accordance with the provisions of TSG R7001–2004 \"Rules for periodic inspection of pressure vessels\", when the annual inspection, comprehensive inspection, and pressure test of a pressure vessel are carried out within the same year, these procedures shall be carried out in sequence: annual inspection, comprehensive inspection, and then pressure test. ( ) Answer: × Index: Article 4 of TSG R7001–2004 \"Rules for Periodic Inspection of Pressure Vessels\". 33. JB/T 4730.2–2005 \"Non-destructive Testing of Pressure Equipment – Part 2: Radiographic Testing\" stipulates that films within the evaluation range with a blackness value D > 4.0 are not allowed to be evaluated. ( ) Answer: × Index: JB/T 4730.2—2005 \"Non-destructive testing of pressure equipment – Part 2: Radiographic testing\" 4.11.2 34. In accordance with the requirements of TSG Z7003—2004 \"Requirements for quality management systems of special equipment inspection and testing institutions\", the top management shall define the responsibilities, authorities, and interrelationships of all management personnel, inspection and testing personnel, and those in key positions who have an impact on the quality of inspections and tests. ( ) Answer: √ Index: Article 14 of TSG Z7003—2004 \"Requirements for Quality Management Systems of Special Equipment Inspection and Testing Institutions\". 35. In accordance with the provisions of TSG Z7001—2004 \"Rules for the Approval of Special Equipment Inspection and Testing Institutions\", inspection institutions applying for initial approval or additional approval must carry out trial inspections for the items for which approval is sought, as required, and must receive confirmation from the supervising authority that their inspection capabilities are sufficient to meet the needs of such inspections. ( ) Answer: √ Index: Article 6 of TSG Z7001-2004 \"Rules for the Approval of Special Equipment Inspection and Testing Institutions\", Appendix 2. II. Multiple-choice questions (Please fill in the code of the correct answer in the blank space.) There are 35 questions in total, 1 point for each question, for a total of 35 points. (The question may have single or multiple choice options.) 1. Special equipment inspection and testing institutions shall carry out inspection and testing work in accordance with the Provisions on the Safety Supervision of Special Equipment, and shall be responsible for their inspection and testing results as well as their assessment conclusions. a. Economic liability b. Responsibility for work quality c. Legal liability Answer: c Reference: Article 6 of the Regulations on the Safety Supervision of Special Equipment 2. In accordance with the Provisions on Administrative Penalties for Safety Supervision of Boilers, Pressure Vessels, Pressure Pipelines and Other Special Equipment, it is prohibited to use such equipment that has passed its inspection expiration date or has failed inspection. a. Order to make corrections, and impose a fine of up to 10,000 yuan. b. Order to make corrections; in the case of non-commercial use, impose a fine of up to 1,000 yuan ； If it is for operational use, a fine of up to 10,000 yuan shall be imposed. Answer: b. Reference: Article 7 of the \"Regulations on Administrative Penalties for the Supervision of Safety in Boilers, Pressure Vessels, Pressure Pipelines, and Other Special Equipment\"; 3. The \"Rules for the Examination and Management of Welders in Boilers, Pressure Vessels, and Pressure Pipelines\" stipulate that the validity period of a welder’s certificate (for the qualified tasks) is several years. a. 1 b. 2 c. 3 d. 4 Answer: c Reference: Article 39 of the «Rules for the Examination and Management of Welders Working on Boilers, Pressure Vessels, and Pressure Pipelines». 4. The «Regulations on Safety Supervision of Pressure Vessels» stipulate that for pressure vessels that cannot be inspected internally due to structural reasons, the requirements regarding regular inspections during use and pressure tests must be indicated on their design drawings. a. Design thickness b. Calculated thickness c. Minimum thickness d. Nominal thickness Answer: b Reference: Article 30, Paragraph 13(3) of the «Regulations on Safety Supervision of Pressure Vessels». 5. The TSG R0002─2005 «Regulations on Safety Supervision of Ultra-high Pressure Vessels» stipulates that the phosphorus content in the chemical composition of ultra-high pressure vessel forgings shall be less than or equal to , and the sulfur content shall be less than or equal to . a. 0.005% b. 0.008% c. 0.012% d. 0.015% Answer: c b Index: TSG R0002─2005 \"Regulations on Safety Supervision of Ultra-High Pressure Vessels\", Article 11. 6. In accordance with the provisions of GB/T 19624－2004 \"Safety Assessment of Defective Pressure Vessels in Service\", those who conduct non-destructive testing as part of the safety assessment of pressure vessels must hold qualification certificates corresponding to the specific non-destructive testing methods used, and they should also have extensive experience in identifying defects and determining their dimensions (including their height). a. Grade II b. Above Grade II c. Grade III Answer: c Reference: GB/T 19624－2004 \"Safety Assessment of Defective Pressure Vessels in Service\" 4.2.1.2 7. The \"Regulations on the Safety Management of Railway Tank Cars for Liquefied Gases\" stipulate that before filling tank cars carrying liquid chlorine or liquid sulfur dioxide, a sealing test using dry air must be conducted; only after the test is successful and all gas in the tank has been removed can filling take place (the standard for dry air is a water content of less than or equal to 100 ppm). The sealing test pressure is times the design pressure. a. 0.9 b. 1.0 c. 1.1 Answer: a Reference: Article 39 of the \"Regulations on the Safe Management of Railway Tank Cars for Liquefied Gases\" 8. In accordance with the requirements of JB/T 4705—2000 \"Wound Gaskets\", the thickness deviation for gaskets with a nominal diameter of DN≥300～1200 mm is mm. a. ±0.1 b. ±0.2 c. ±0.3 Answer: b Index: JB/T 4705—2000 \"Wound Gaskets\", Table 5. 9. In accordance with the provisions of TSG R0001—2004 \"Safety Technical Inspection Regulations for Non-metallic Pressure Vessels\", the graphite tubes in graphite pressure vessels shall undergo a hydrostatic test one by one before assembly. The pressure value for the hydrostatic test should be no less than times the design pressure value; a hold time of 10 minutes is required, and no leakage indicates success. a. 2 b. 1.5 c. 3 d. 1.25 Answer: a Index: TSG R0001—2004 \"Regulations on Safety Supervision of Non-metallic Pressure Vessels\", Article 46. 10. In accordance with the \"Regulations on the Management of Special Equipment Inspection and Testing Institutions\", determine which of the following statements regarding inspection and testing activities are correct a. An approved inspection and testing institution shall not subcontract the inspection and testing tasks it has undertaken to other inspection and testing institutions when carrying out such work. b. Inspection and testing agencies may subcontract non-destructive testing tasks, but shall not subcontract specialized testing tasks such as material testing and metal surveillance. Answer: a Index: Articles 19/20 of the Regulations on the Management of Special Equipment Inspection and Testing Institutions. 11. According to the Rules on the Qualification Licensing and Management of Design Units for Pressure Vessels and Pressure Pipelines, determine which of the following statements regarding the qualifications of personnel responsible for the approval of pressure vessel designs are correct a. Design approvers for pressure vessels must undergo specified training, pass relevant examinations, and obtain the corresponding \"Design Approver Qualification Certificate\". b. Personnel engaged in the design of pressure vessels, including those responsible for design, verification, review, approval (or certification), must undergo specified training, pass relevant examinations, and obtain the corresponding \"Design Approval Officer Qualification Certificate\". c. Design approvers refer only to those who grant (or approve) approval. Answer: a. Reference: Article 8 of the \"Rules for the Qualification, Licensing, and Management of Design Organizations for Pressure Vessels and Pressure Pipelines.\" 12. JB/T 4709—2000 \"Welding Procedures for Steel Pressure Vessels\" stipulates that during post-weld heat treatment, the temperature inside the furnace must not exceed ______°C when the welded parts are placed in the furnace, and it must not exceed ______°C when they are taken out of the furnace. a. 300 b. 400 c. 500 d. 600 Answer: b b Index: JB/T 4709－2000 \"Welding Code for Steel Pressure Vessels\" 8.10 13. Among the following inspection items, which ones are classified as Category A inspection items as specified in the \"Table of Inspection Items for the Safety Performance of Pressure Vessel Products\" in Appendix (2) of the \"Rules for Supervision and Inspection of the Safety Performance of Boiler and Pressure Vessel Products\"? a. Certificates of material for the main stressed components and welding materials. b. Welding procedure qualification. c. Withstand voltage test. d. Factory data. Answer: b, c. Reference: Article 8 of the \"Rules for Supervision and Inspection of the Safety Performance of Boiler and Pressure Vessel Products\", Appendix (2) – \"Table of Items for Supervision and Inspection of the Safety Performance of Boiler and Pressure Vessel Products\" (IV). 14. In accordance with the provisions of TSG R7001–2004 \"Rules for Periodic Inspection of Pressure Vessels\", after the on-site inspection is completed, reports should be issued within a certain number of working days for regular equipment, and within another specified number of working days for large-scale equipment. a. 7 b. 10 c. 15 d. 30 Answer: b, d. Reference: Article 50 of TSG R7001―2004 \"Rules for Periodic Inspection of Pressure Vessels\". 15. In accordance with the requirements of JB/T 4746—2002 \"End Caps for Steel Pressure Vessels\", the misalignment amount at the joints of the plates shall not exceed 10% of the thickness of the steel material, and shall also not be greater than a certain value in millimeters. a. 1.0 b. 1.5 c. 2.0 d. 3.0 Answer: b Index: JB/T 4746—2002 \"Ends for Steel Pressure Vessels\" 6.2.4 16. TSG R7001―2004 \"Rules for Periodic Inspection of Pressure Vessels\" stipulates that the wall temperature for strength verification shall be taken as ； For low-temperature pressure vessels, use . a. Design temperature b. Normal temperature c. Maximum operating temperature d. Measured maximum wall temperature e. Minimum operating temperature Answer: d b Reference: Article 25(10) of TSG R7001–2004 \"Rules for Periodic Inspection of Pressure Vessels\" 17. In accordance with GB 150–1998 \"Steel Pressure Vessels\", when assembling the vessel, the length of the outer arc between the centerlines of the A-class welds of adjacent cylinder sections should be greater than . a. 3 times the thickness δs of the steel b. 100 mm c. 5 times δs, with a minimum value of 100 mm d. 3 times δs, with a minimum value of 100 mm Answer: d Reference: GB 150—1998 “Steel Pressure Vessels” 10.2.4.5 18. According to GB 150—1998 “Steel Pressure Vessels”, the steel used for the pressure-bearing components of low-temperature vessels must meet certain requirements; the minimum operating temperature of the steel may differ from the lowest test temperature specified in the steel standards. a. Killed steel b. Semi-killed steel c. Boiled steel d. Converter steel Answer: a Index: GB 150—1998 \"Steel Pressure Vessels\", Appendix C C2.1 19. In accordance with the provisions of JB 4732—1995 \"Steel Pressure Vessels — Analysis and Design Standards\", for composite steel plate laminations, the grinding depth shall not exceed % of the thickness of the laminate, and shall not be greater than 1 mm. a. 10 b. 20 c. 30 d. 40 Answer: c Index: JB 4732—1995 \"Steel Pressure Vessels — Code for Analytical Design\", 11.2.4.13; 20. GB 151—1999 \"Shell and Tube Heat Exchangers\" stipulates that the butt joints of gusset plates shall be subjected to radiographic or ultrasonic testing, with a radiographic inspection meeting the specified grade as per JB 4730, or an ultrasonic inspection reaching the designated grade, to be considered satisfactory. a. 20% b. 100% c. I d. II e. III Answer: b d c Index: GB 151—1999 \"Shell and Tube Heat Exchangers\" 6.4.1 21. According to JB/T 4731－2005 \"Steel Horizontal Vessels,\" when gaskets are used for reinforcement, it is required that their thickness be not less than ______ of the cylinder’s thickness. a. 0.5 times b. 0.6 times c. 1 time d. 2 times Answer: b Index: JB/T 4731–2005 \"Horizontal Steel Vessels\" 7.3.4.1.2. 22. JB/T 4781–2005 \"Liquefied Gas Tank Containers\" stipulates that the hydrostatic test pressure PT = P ； Pneumatic test pressure PT = P. a. 1.25 b. 1.3 c. 1.15 d. 1.5 Answer: b, c. Reference: JB/T 4781–2005 \"Liquefied gas tank containers\", 6.3.13. 23. In accordance with the provisions of JB/T 4700–2000 \"Classification and technical requirements for pressure vessel flanges\", which of the following steel plates shall not be used as flanges for pressure vessels containing highly or extremely hazardous toxic substances? a. Q235-A. b. Q235-B. c. 16MnR. d. 15CrMoR. Answer: a b Index: JB/T 4700—2000 \"Classification and Technical Requirements for Pressure Vessel Flanges\" 6.2.2 24. In accordance with the provisions of JB 4728—2000 \"Stainless Steel Forgings for Pressure Vessels\", the heat treatment state of 0Cr13 is . a. Solid solution b. Stabilization c. Annealing d. Normalizing Answer: c Index: JB 4728—2000 \"Stainless steel forgings for pressure vessels\" 5.5 25. GB 16749—1997 \"Wave-shaped expansion joints for pressure vessels\" specifies: the longitudinal weld of the bellows after overall forming. a. Repair is not allowed. b. Repair welding is allowed. c. Heat treatment is performed after weld repair. Answer: a. Reference: GB 16749–1997 \"Wave Expansion Joints for Pressure Vessels\" 7.2.5.1. 26. TSG R7001–2004 \"Rules for Periodic Inspection of Pressure Vessels\" stipulates that pressure vessels should generally undergo their first comprehensive inspection after being in service for a certain period of time. a. 1 year b. 2 years c. 3 years d. 6 years Answer: c Reference: Article 5 of TSG R7001―2004 \"Rules for Periodic Inspection of Pressure Vessels\"; 27. The \"Regulations on the Safety Supervision of Special Equipment\" stipulate that when special equipment inspection and testing institutions conduct such inspections and tests and discover certain issues, they must promptly inform the units that use the special equipment, and at the same time report to the authorities responsible for the safety supervision of special equipment. a. Serious potential accident hazards b. Potential accident hazards Answer: a Index: Article 49 of the Regulations on the Safety Supervision of Special Equipment 28. Based on JB/T 4736—2002 \"Strengthening Rings\", determine which of the following statements regarding the technical requirements for strengthening rings are correct a. The weld joints used in low-temperature pressure vessels must adopt a fully penetrated structure. b. The reinforcement ring shall be manufactured as a single piece and must not be joined together. c. The welding of the reinforcement ring to the housing and connectors shall be carried out using welding procedures that have been approved in accordance with JB 4708—2000. d. When installing the reinforcement ring, the M10 screw holes on the reinforcement ring should be positioned at the highest point of the housing. Answer: a c. Index: JB/T 4736—2002 \"Reinforcing Rings\"; 5 29. The \"Regulations on the Safety Management of Medical Oxygen Chambers\" require that the design of medical oxygen chambers follow a certain system. a. Qualification approval for design agencies b. Approval of design drawings c. Approval of design documents Answer: c Reference: Article 6 of the «Regulations on the Safety Management of Medical Oxygen Chambers» 30. In accordance with the provisions of Annex 1, «Outline for Supervisory Inspection of the Safety Performance of Boiler and Pressure Vessel Products», in the «Rules for Supervisory Inspection of the Safety Performance of Boiler and Pressure Vessel Products», inspectors shall select sample bottles from each batch to supervise the hydrostatic pressure burst test on-site. a. 1 b. 2 c. 3 d. 5 Answer: a Index: Appendix (1) of the «Rules for Supervision and Inspection of Safety Performance of Boiler and Pressure Vessel Products», III(III)14 31. JB/T 4710–2005 «Steel Tower-Type Vessels» stipulates that for single-sided welded butt joints (with gaskets in close contact with the base metal along the entire length of the weld root), the welding joint coefficient Φ for 100% non-destructive testing is %. a. 0.90 b. 0.85 c. 1.00 d. 0.95 Answer: a Index: JB/T 4710–2005 \"Steel Tower-Type Vessels\" 5.3 32. JB 4708–2000 \"Welding Procedure Qualification for Steel Pressure Vessels\" stipulates that after the test specimen is bent to the specified angle, there shall be no cracks or defects of a length greater than ______ mm in any direction on its tensile surface; cracks at the corners of the specimen are generally not considered, but cracks at the corners caused by slag inclusions or other welding defects must be taken into account. a. 1.5 b. 2 c. 3 d. 5 Answer: c Index: JB 4708－2000 \"Welding Procedure Qualification for Steel Pressure Vessels\" 7.2.2.5.4 33. In accordance with the provisions of TSG Z7001—2004 \"Rules for the Approval of Special Equipment Inspection and Testing Institutions\", the financial capacity of non-self-inspection institutions (comprehensive inspection institutions) to cover compensation for any negligence in carrying out inspections shall be no less than . a. 500,000 yuan b. 1 million yuan c. 3 million yuan d. 6 million yuan e. 9 million yuan Answer: c Reference: Article 6 of TSG Z7001—2004 \"Rules for the Approval of Special Equipment Inspection and Testing Institutions\", Appendix 2, II(11); 34. The \"Measures for the Supervision and Management of Boiler and Pressure Vessel Manufacturing\" stipulate that the validity period of a manufacturing license is . Manufacturing enterprises applying for a renewal must submit a written application for renewal to the safety supervision agency of the issuing authority before the expiration date of their Manufacturing License. Upon successful review, the issuing authority will issue a new Manufacturing License. a. 4 years b. 5 years c. 3 months d. 6 months Answer: a, d Reference: Article 18 of the «Regulations on the Supervision and Management of Boiler and Pressure Vessel Manufacturing»; 35. GB 3531—1996 «Low-alloy steel plates for low-temperature pressure vessels» stipulates that the steel plates shall be delivered in either or state. a. Normalizing b. Normalizing followed by tempering c. Quenching and tempering d. Tempering Answer: a, b Index: GB 3531—1996 \"Low-alloy steel plates for low-temperature pressure vessels\" 4.3 III. Comprehensive questions (30 points in total: 10 points for Question 1) ； Question 2 (20 points): 1. There is a reactor feed heater that was put into use in 2000. Its first comprehensive inspection along with pressure testing was carried out in July 2005. The issues identified during the inspection were defects in the shell side casing where the spacing between welds was less than the specified value; no new defects were detected. The conclusion report of the comprehensive inspection, some individual inspection reports, and the pressure test report for the shell side have been selected. You are to review the contents filled in these reports (with the exception of the entries marked as “omitted” in the reports and the contents of the pressure vessel inspection report). Please identify any errors in the reports and make the corrections (fill in the table below): Sequence Number, Errors in the Report, Correct Content to Be Filled In: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10. Conclusion Report of Comprehensive Inspection of Pressure Vessel: Report Number: (omitted), User Unit: (omitted), Unit Address: (omitted), Unit Code: (omitted), Person in Charge: (omitted), Contact Number: (omitted), Postal Code: (omitted). Name of Vessel: Reactor Feed Heater, Equipment Code: (omitted), Type of Vessel: (omitted), License Number: (omitted), Internal Unit Number: (omitted), Structural Design: (omitted). Main Inspection Standards: GB150-1998 “Steel Pressure Vessels”. Locations, severity, nature of defects found during inspection, and recommendations for handling (photos or additional pages may be attached if necessary): There are defects in the weld spacing of the shell side, where the spacing is less than the specified value; no new defects were detected during the inspection. (Schematic diagram omitted) Upon inspection, the safety status level of this pressure vessel has been rated as Grade 2. Allowed/monitored operating parameters (criteria for monitoring or shutdown): Pressure: 1.4 MPa on the shell side / 1.4 MPa on the tube side. Temperature: 175°C on the shell side / 159°C on the tube side. Medium: Saturated steam (shell side) / Cyclohexane (tube side). Other: The operating conditions to be monitored are that overheating and overpressure are not permitted. Next date for comprehensive inspection: July 20, 2011. Institutional approval number: (omitted) (Institutional inspection seal) (omitted). Inspection date: July 31, 2005; Review date: July 20, 2005; Approval date: July 31, 2005. Report on the review of pressure vessel documentation. Internal unit code/equipment code: (omitted). Report number: (omitted). Designing agency: (omitted). Design date: April 1999. Design standard: GB151-89. Vessel diagram number: (omitted). Manufacturing agency: (omitted). Serial number at time of manufacture: (omitted). Manufacturing standards: GB151-89 and “Regulations for Pressure Vessels”. Manufacturing date: December 1999. Installation agency: (omitted). Date of commissioning: June 2000. Inner diameter of vessel: 1000 mm. Height/length of vessel: 7334 mm. Heat exchange area: 157.4 m². Loading mass/coefficient: None. Head type: Elliptical. Support type: Saddle support. Material of the main body: Cylinder – 0Cr18Ni9 (for shell/tube sides). Thickness of the main body: Cylinder – 8 mm (for shell/tube sides); Head – 0Cr18Ni9, thickness 10 mm. Heat exchange tubes: 0Cr18Ni9, thickness 2 mm. Lining: None. Design pressure: Shell side – 1.4 MPa. Actual operating pressure: Shell side – 0.8 MPa; Tube side – 1.4 MPa; Tube side – 1.1 MPa. Design temperature: Shell side – 250°C. Actual operating temperature: Shell side – ≤175°C; Tube side – 200°C; Tube side – ≤159°C. Corrosion allowance: Cylinder – 0 mm. Working medium: Shell side – Saturated steam; Head – 0 mm; Tube side – Cyclohexane. Any issues identified during document review: None. Issues identified from previous comprehensive inspections: This is the first comprehensive inspection. Inspection: (Omitted) Date: July 18, 2005 Review: (Omitted) Date: July 18, 2005 Magnetic Particle Inspection Report Unit internal number/equipment code: (Omitted) Report number: (Omitted) Model of inspection instrument: (Omitted) Number of inspection instrument: (Omitted) Type of magnetic particles: (Omitted) Magnetic suspension: (Omitted) Sensitivity test piece: (Omitted) Magnetization method: (Omitted) Lift force/magnetization current: (Omitted) Spraying method: (Omitted) Inspection standards: (Omitted) Inspection ratio: (Omitted) % mm Schematic diagram of inspection area and defect location: Inspection area: Shell butt weld Schematic diagram of defect location: Omitted Evaluation table for magnetic particle inspection Section number Defect location Size of defect mark (mm) Nature of defect Evaluation Remarks A1-1 None None None Grade I A1-2 None None None Grade I A2-1 None None None Grade I A2-2 None None None Grade I B1 None None None Grade I B2 None None None Grade I B3 None None None Grade I Inspection result: Qualified Inspection: (Omitted) Date: July 18, 2005 Review: (Omitted) Date: July 18, 2005 Note: If the evaluation table for magnetic particle inspection results is insufficient, additional pages can be added in accordance with the format of the table. Pressure resistance test report: Unit internal number/equipment code: (omitted) Report number: (omitted) Design pressure: 1.4 MPa; Maximum operating pressure: 0.8 MPa; Test pressure: 0.84 MPa. Material of the main body: Head: 0Cr18Ni9; Cylinder: 0Cr18Ni9. Test medium: Water; Medium temperature: 4°C. Location of the pressure test: Workshop; Ambient temperature: 0°C. Pressure gauge range: 0–1 MPa ； Accuracy grade 1.6. Pump model: (omitted). Test procedure record: Slowly increase the pressure to the test pressure of 0.84 MPa, and maintain this pressure for 10 minutes ； Slowly reduce the pressure to the maximum operating pressure of 0.8 MPa, and hold it for 15 minutes ； Check the container: no leaks, no visible deformation, no abnormal noises. Actual test curve: (Omitted) Test result: No leakage. Inspection: (Omitted) Date: July 19, 2005. Reviewer: (Omitted) Date: July 19, 2005. Sequence number, Errors in the report, Correct content to be filled in, Score 1. Main inspection standard: GB150-1998, Rules for periodic inspection of pressure vessels. 1. 2. Weld spacing is less than the specified value (no new defects); rated as Grade 2 or Grade 3. 1. 3. Allowable operating parameters: design pressure of 1.4 MPa, operating pressure of 0.8 MPa (shell)/1.1 MPa (tubes). 1. 4. In the “Other” column, it should state that overheating and overpressure are not allowed; it should be filled with “None” or “/”. 1. 5. For austenitic stainless steel, the magnetic particle inspection report is omitted. 1. 6. The pressure for the pressure resistance test is 0.84 MPa; it should be at least 1 MPa (1.25×0.8). 1. 7. The location for the pressure resistance test is indicated as the workshop; it should be the shell side. 1. 8. The range of the pressure gauge is 0.1 MPa; it should be 0(1.5–3) MPa. 1. 9. The holding time under test pressure is 10 minutes; it should be 30 minutes. 1. 10. Test result: No leakage; it should be marked as “Pass”. 1. Answers: Note: 0.5 points for identifying errors, 0.5 points for providing the correct content ； 1 point will be deducted for marking the correct answer as incorrect, with a maximum deduction of 10 points. 2. A 100 m3 liquid ammonia storage tank in a certain cold storage facility has the following basic parameters: Design pressure: 2.16 MPa ； Maximum operating pressure: 2.0 MPa ； Design temperature: 50℃ ； Material: 16MnR ； Specifications: Ф3000×14000×24mm ； Volume: 100m3 ； Medium: liquid ammonia ； Corrosion margin: 2mm ； Weld coefficient: 1.0. 50℃ = 163 MPa, 20℃ = 163 MPa, σs = 325 MPa. This storage tank was manufactured in April 1996 and put into use in June of the same year. Its first inspection was conducted in June 1999, and no defects exceeding acceptable limits were found; its safety rating is grade 1. The second tank inspection was conducted in June 2005, with inspection items including visual inspection, wall thickness measurement, and 20% magnetic particle testing on the inner surface of the butt-welded joints. Inspection revealed multiple cracks on the surface of the bottom butt weld and along the fusion line inside the tank. Question: 1. Analyze the possible causes of the cracks (5 points) 2. After detecting cracks on the inner wall surface, do you think further inspection measures should be taken? What additional testing measures should be taken if necessary? (2 points) 3. The largest surface crack was polished to create a smooth transition, resulting in a pit. Tests on this pit revealed no surface or internal defects. The dimensions of the pit are as follows: length 150 mm, depth 4.5 mm, width 50 mm. The actual wall thickness at the defective area before polishing was 23.1 mm. If the next inspection period is no more than 3 years, is it necessary to weld repairs to this pit? (8 points) 4. Is a voltage withstand test required for this inspection? If necessary, which type of voltage withstand test should be used? How is the test pressure determined? (3 points) 5. What should be the key focus areas for the next comprehensive inspection? Why? (2 points) Answer: 1. Stress corrosion cracks occur under the combined action of liquid ammonia and tensile stress. (5 points) 2. (1) Increase the proportion of surface flaw detection on the joints located on the inner surface of the storage tank; if cracks are still detected in those areas that were inspected more thoroughly, then non-destructive testing of the surfaces of all welding joints should be carried out ； (0.5 points) (2) Conduct random surface flaw inspections on the outer surface of their corresponding mating joints ； (0.5 points) (3) If non-fluorescent magnetic particle testing is used for the joint inspections on the inner surface of the original storage tank, it should be replaced with fluorescent magnetic particle testing ； (0.5 points) (4) 20% ultrasonic testing should be used as a sampling method for the tank joint connections. (0.5 points) 3. (1) Wall thickness remaining in the pit: The corrosion amount in the next cycle, C2, is given by C2 = (24 – 23.1) ÷ 9 × 3 = 0.3 mm (0.5 points). The checked thickness δ = (0.5 points). Comparing the δ thickness at the bottom of the pit with the calculated thickness: δ = 23.1 – 4.5 = 18.6 mm, which is less than 18.82 mm. Since the depth of the pit exceeds the remaining wall thickness, it is necessary to determine whether it falls within the allowable range in accordance with the ‘Rules for Periodic Inspection of Pressure Vessels’. (1 point) The pit is transformed into a semi-elliptical shape based on the rules of its enclosing rectangle; the length of the major axis, the length of the minor axis, and the depth are respectively 2A = 150 mm, 2B = 50 mm, and C = 4.5 mm. (1 point) R = (3000 + 23.1)/2 = 1511.55 mm; T = 23.1 – 0.1×3 = 22.8 mm. The ratio T/R is less than 0.18. (1 point) Since C = 4.5 mm is less than T/3, the minimum thickness at the bottom of the pit is (T – C) = 22.8 – 4.5 = 18.3 mm, which is greater than 3 mm. (1 point) A is less than 1.4 mm. (1 point) B is greater than 3C, where 3C = 3×4.5 = 13.5 mm. (1 point) G0 is less than 0.10; therefore, this pit falls within the allowable limits, and no repair welding is required. (1 point) 4. This inspection requires a pressure resistance test (0.5 points), which is carried out using air pressure ； If a hydraulic test is used, vacuum pumping should be carried out after the test is successful. (0.5 points) (1) If a pressure test is conducted: The test pressure is PT = 20°C = 50°C; therefore, PT = ηP = 1.15 × 2 = 2.3 MPa. (1 point) Stress verification for the pressure test: δmeasured = 23.1 – 4.5 = 18.6 mm. σT = … MPa. Since σT < 0.8σsφ = 0.8 × 325 × 1 = 260 MPa, the stress requirements for the pressure test are met. (1 point) (2) If a hydraulic test is conducted: Test pressure: PT at 20°C = 50°C; therefore, PT = ηP = 1.25×2 = 2.5 MPa (1 point). Stress verification for the pressure resistance test: δmeasured = 23.1 – 4.5 = 18.6 mm. σT = … MPa. σT < 0.9σsφ = 0.9×325×1 = 292.5 MPa. The stress requirements for the hydraulic test are satisfied. (1 point) 5. In accordance with the Regulations on Periodic Inspection of Pressure Vessels, during the next thorough inspection after opening the vessel, in addition to the regular inspection areas, surface flaw detection should be carried out specifically on the depressions resulting from the grinding of surface cracks, and surface flaw detection should also be increased for the butt welds located near the areas that have been ground. (1 point) Because the pits after grinding have significant stress concentration, stress corrosion may occur as a result of this stress concentration, leading to the formation of surface cracks again. (1 point)