【Containers and Storage Areas】Daily Question Submission Thread (Prize-based; participants will receive a reward)
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To liven up the atmosphere of this edition, we are now seeking daily questions. To make the title better reflect everyone’s requirements, we are now seeking input from all members. I. The requirements for the daily question are as follows: 1. The *questions mainly focus on issues related to pressure vessels and vessels operating at atmospheric pressure. Since this activity has just started, it is hoped that more fill-in-the-blank, multiple-choice, and true/false questions will be provided to help everyone review some basic theoretical knowledge and gain a deeper understanding of the standards or regulations ； 2. *The question provider should post a hidden reply here; the answer to *the question should be published along with *the question.* ； 3. Open one floor at a time to facilitate rewards ； 4. No confidentiality or constraints preventing public disclosure ； 5. All members can participate. II. Reward system for one question per day: 1. For each selected question – whether it is a fill-in-the-blank, multiple-choice, or true/false question with an answer – 5 wealth points are awarded; for questions without answers, 3 wealth points are given per question. For multiple-choice and discussion questions, those with answers earn 30 wealth units or an equivalent amount of charm, while those without answers earn 15 wealth units or an equivalent amount of charm. 2. For the *questions that were not adopted, a uniform reward of 5-10 wealth units is given for each *question. III. Precautions: Replies to this post must be limited to the daily question provided; any other content will be treated as spam and subject to penalties. These regulations shall come into effect on December 28, 2010; the final interpretation of these activities lies with the moderators of containers and storage areas. Moderators should be cautious when giving ratings and read the requirements carefully.
Multiple-choice question: According to GB150, the inner diameter corners of plug-in nozzles shall be rounded under ( ) conditions. A. Pressure vessels subjected to fatigue loads B. Low-temperature pressure vessels C. High-pressure vessels D. Vessels whose standard minimum tensile strength of steel is greater than 540 MPa. Answer: A, B, D
This post was last edited by jia717 on 2010-12-29 at 12:34. 1. Under which of the following usage conditions do Q245R and Q345R steel plates need to be used in the normalized state? (A, B, D) A. High-alloy steel plates B. Those used for shells with a thickness greater than 36 mm C. Below 0° D. Those used for other pressure-bearing components (flanges, tube sheets, flat covers, etc.) with a thickness greater than 50 mm
Multiple-choice question: In the formula for calculating elliptical heads, K is known as the shape factor; it represents the ratio of the ___C__ stress on the head to the ___D___ membrane stress of the butted cylinder. A, maximum film thickness B, maximum bending C, maximum total D, circumferential E, axial
4. Among the following thicknesses, the minimum thickness that meets the requirements for strength and service life is ___________. A: Design thickness A: Calculated thickness A: Nominal thickness Answer A
This post was last edited by jia717 on 2011-1-4 at 18:20. 1. A liquid chlorine buffer tank with a design pressure of 0.8 MPa and a volume of 1 m3 should be classified as a （ ） category container. 2. A liquefied petroleum gas residue tank with a design pressure of 1.6 MPa and a volume of 2 m3 should be classified as a ( ) category vessel. 3. A shell-and-tube waste heat boiler with a design pressure of 1.3 MPa should be classified as a （ ） category of vessel.
This post was last edited by jia717 on 2011-1-4 at 18:21. 1. Boilers can be classified by purpose into industrial boilers, power generation boilers, and (C). A. Electric heating boiler B. Waste heat boiler C. Domestic boiler D. Small boiler 2. The standard for the total hardness of the feed water in external water treatment for industrial boilers is (B). A. <0.03 millimoles/liter B. ≤0.03 millimoles/liter C. <0.04 millimoles/liter D. ≤0.04 millimoles/liter 3. The pressure gauges used in boilers are generally inspected at least (B) once. A. 3 months B. 6 months C. 1 year D. 2 years 4. During the operation of a boiler, the safety valve should generally be tested manually for discharge (B) times. A. 1 day B. 1 week C. 1 month D. Half a year 5. According to the Steam Boiler Regulations, boilers with a rated evaporation capacity of ≥ (A) must be equipped with a low water level interlock protection device. A、2T/h B、4T/h C、6T/h D、10T/h
Reply to 7# hywtg: Please hide the reply, thank you
According to GB150-1998, if the calculated thickness of the compressed member is 12.75 mm, the corrosion allowance C2 is 2 mm, and the negative deviation of the steel plate thickness C1 is 0.25 mm. Its designed thickness is A. 14.75 mm B. 15 mm C. 16 mm D. 14.5 mm. The correct answer is A
This post was last edited by May Day on 2011-1-5 at 21:55. Question 1: The test temperature refers to the metal temperature of the container shell during the pressure test, rather than the temperature of the testing liquid. 2. GB150-1998 specifies that the design thickness refers to the sum of the calculated thickness and the corrosion allowance, while the effective thickness refers to the nominal thickness minus the thickness addition. 3. When the temperature is below 0°C, the allowable stress for steel and bolt materials shall be that at 0°C. 4. The weld factor shall be selected based on the type of welds in the pressurized parts of the container and the requirements for non-destructive testing. 5. During the pressure test, the membrane stress in the cylinder shall not exceed 90% of the yield limit at the test temperature. 6. Low-pressure storage containers for flammable media are classified as Class 1 pressure vessels. 7. When the sb value of the pressure vessel shell material is >540 MPa, reinforcement rings should not be used for reinforcement. 8. In terms of material, GB150, GB151, and JB4730 are only applicable to steel pressure vessels. 9. For pressure vessels without inspection holes, 100% non-destructive testing is required for Class A and B welds. 10 The opening pressure of the safety valve must not exceed the design pressure of the pressure vessel. Answer: 1. Right ； 2. Yes ； 3. Wrong ； 4. Wrong ； 5. Yes ； 6. Wrong ； 7. Yes ； 8. Wrong ； 9. Yes ； 10. Yes
Reasons for the failure of refractory linings in pressure vessels, and how to repair them