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Time：2022/6/5 11:58:20 Category：TECHNICAL ARTICLE Source： Click：
Part I: Safety valve calibration test questions and answers
Safety valve calibrator test questions and answers
A, judgment questions: (in each question after the answer cross "√" or "×" 3 points per question, a total of 30 points)
1、According to JB/T308-2004 "valve type preparation method", the safety valve model A42Y-25 indicates that the valve body material is carbon steel. Answer: √
2、According to JB/T308-2004 "Valve Modeling Method", safety valve model A47H-16C is micro-opening, spring load spring is not closed and with wrench structure.
3、The safety valve with applicable temperature of 150°C＜t≤350°C is a medium temperature safety valve.
4、Safety valves are divided into micro-opening safety valves and fully-opening safety valves according to the opening height.
5、The nominal size DN is a combination of letters and numbers used to identify the size of the piping system components. It consists of the letter DN and the integer number followed by a factorless subdivision. This number is directly related to the characteristic dimensions such as the bore or outside diameter (expressed in mm) of the end connection.
6, safety valve stable discharge, there should be good mechanical characteristics, but allow the presence of frequent jumping, chattering, jamming and other phenomena.
7、Snagging is helpful to open and return to the seat of the safety valve.
8、Safety valve flap and seat between the sealing test, sealing test pressure is 90% of the rectification pressure.
9、The diameter of the flow path of the safety valve is the minimum diameter between the inlet end of the safety valve and the sealing surface of the closing member.
10、A48Y-16C type spring direct load fully open safety valve is mainly used to discharge flammable, explosive and toxic media. Answer：×
Second, single-choice questions: (each sub-question given four options, only one is correct, please select and fill in the answer in the horizontal line space, 2 points per question, a total of 40 points)
1, "People's Republic of China Special Equipment Safety Law" came into force on _________. A, January 1, 2013
B, January 1, 2014 C, January 1, 2015
D、January 1, 2016
2, "special equipment operators card" every _____ year review. Licensed personnel should be reviewed 3 months before the expiry of the review period, the issuing department to submit an application for review.
A, 2 years
B, 3 years
C, 4 years
3、The nominal pressure of medium pressure safety valve PN is
4, TSG ZF001-2006 "Safety Valve Safety Technical Supervision Regulations" applies to "special equipment safety supervision regulations" for boilers, pressure vessels and pressure piping and other equipment used on the highest working pressure greater than or equal to _____ safety valve.
A, 0.01 MPa
B, 0.1 MPa
C, 0.02 MPa
5, according to TSG ZF001-2006 "Safety Valve Safety Technical Supervision Regulations" Appendix E: the pressure gauge on the safety valve calibration table calibration cycle for ______.
6、The opening and closing pressure difference is ______, usually expressed as a percentage of the rectification pressure, or in MPa when the rectification pressure is less than 0.3MPa.
A、Difference between the rectification pressure and the discharge pressure
B、Difference between the rectification pressure and the sealing pressure
C、Difference between setting pressure and return pressure
D、Difference between discharge pressure and return pressure
7、The action process of safety valve is _________.
A, open - discharge - back to the seat - seal
B, open - back to the seat - seal
C. Leak - open - seal
D、None of the above Answer：A
8、According to JB/T308-2004 "Valve Modeling Method", the valve body material is CF8 spring full-open safety valve, the correct model preparation is ______.
9、According to JB/T308-2004 "Valve Modeling Method", the safety valve model A27H-10T indicates that the nominal pressure of the safety valve is ______.
10、Safety valve sealing or lining material, fluoroplastic code is ________.
11、The opening height of fully open safety valve is greater than or equal to the diameter of the flow channel ______.
12, according to GB/T12243-2005 "spring direct load safety valve" provisions: pressure vessels and pressure piping with safety valves, when the rectification pressure is less than or equal to 0.5MPa, the limit deviation of the rectification pressure is: ______.
A, ± 0.015MPa B, ± 0.025MPa C, ± 3% of the rectification pressure D, ± 5% of the rectification pressure
13, according to GB/T12243-2005 "spring direct load safety valve", the medium for steam safety valve setting pressure is less than or equal to 0.3MPa, sealing test pressure for _______MPa . A、80％ of the setting pressure
B、90% of the setting pressure
C、0.03 lower than the setting pressure
D、0.05 lower than the setting pressure
14, the factory test of the safety valve is divided into _________. A. Strength test, sealing test and rectification pressure test
B, strength test, sealing test and back to the seat pressure test
C, strength test, sealing test and discharge pressure test
D, sealing test and rectification pressure test
15, according to TSG ZF001-2006 "Safety Valve Safety Technical Supervision Regulations" provisions: to carry out in-service equipment inspection, safety valve using the unit itself when the safety valve calibration, should be submitted to the calibration report ______. A, the use of safety valves in the unit using the department
B, the provincial safety supervision agencies
C, the inspection and testing agency responsible for the inspection of the equipment
D, the local safety monitoring agencies
16, if the use of the safety valve medium for oxygen, the safety valve parts must be _____ before reassembly.
A, grinding treatment
B, passivation treatment
C, low-temperature cooling treatment
17, the safety valve stem is significantly bent, should take ________ approach to deal with. A、Turning method
D、Maintain as is
18, the safety valve sealing surface repair, fine grinding can be used for the abrasive is
A, W40 micronized powder
B、W20 micronized powder
C、W10 micronized powder
D、W2.5 micronized powder
19、The safety valve rectification pressure value is determined by _______.
A, "Safety Valve Safety Technical Supervision Regulations
B、GB/T12243-2005 "spring direct load type safety valve
C, the regulations and standards of the protected equipment
D、Using unit or user
Answer: C 20, under what circumstances should the safety valve stop using and scrapped? _______ A, historical information is lost B, improper selection
C. Accessories are incomplete and can not be configured D. All of the above
Third, multiple-choice questions: (each sub-question given in the four options, one or more is correct, 3 points per question, a total of 30 points, multiple choice, less, wrong choice are not scored)
1, the safety valve according to the action characteristics are divided into ________ ?
A, proportional action safety valve
B. Two-stage action safety valve
5 C. Direct-acting safety valve
D、Non-direct acting safety valve
2、______ is a category of direct-loaded safety valve. A、Leveraged heavy hammer safety valve
B、Heavy hammer safety valve
C、Pilot-operated safety valve
D、Spring type safety valve
3, according to TSG ZF001-2006 "Safety Valve Safety Technical Supervision Regulations" provisions: engaged in the use of safety valves of which work personnel should obtain "special equipment operator card"? A, disassembly and maintenance personnel
B, calibration work of personnel
C, operation and maintenance personnel
Answer: A, B, C
4, according to TSG ZF001-2006 "Safety Valve Safety Technical Supervision Regulations" provisions: safety valve maintenance, overhaul, calibration unit technical files should include which content?
A, the safety valve maintenance and overhaul records
B, safety valve periodic inspection records and reports
C, the scrapped safety valve records
D, the extension of the calibration approval documents
Answer: A, B, C
5, safety valve calibration bench at room temperature, such as to meet the flow requirements, to determine the project are ______. A, the rectification pressure
B, seal test pressure
C, back to the seat pressure
D discharge pressure
Answer: A, B, C
6、According to the national standard GB1047, which of the following safety valve specifications is not present? ______ A、DN25
7、According to JB/T308-2004 "Valve Modeling Method", the safety valve model number WA42F-16C is indicated by ________.
A、The sealing surface is fluorine plastic
C, the valve body material is stainless steel
D、Bellows balanced type Answer: A, D
8, the basic requirements of the spring for safety valve is _________.
A, the requirements of stability B, the requirements of strength
C, the requirements of corrosion
D, the requirements of geometric dimensions
Answer: A, B, C, D
9, pilot operated safety valve in normal working condition, ________ statement is correct. A, the main valve to maintain a sealed state, the pilot valve in the open state B, the main valve and pilot valve are kept sealed state
C, the main valve valve cavity pressure and the main valve inlet pressure equal D, the main valve valve cavity pressure is greater than the main valve inlet pressure
10、Safety valves should be prepared before repair work: __________ A, issued a maintenance task book
B, spare parts and materials of relevant parts C, disassembly of the safety valve corresponding tools
Answer: A, B, C, D