Process Engineering Division – December 2009 Technical Discussant Assessment and Bonus Distribution Notice (Maximum reward this month: 500 Wealth)

This post was last edited by lxq700918 on 2010-1-1 18:01. Happy New Year, Super Edition! Happy New Year to all colleagues! Serial Number, Post and Link: 1. What is the typical particle size for catalyst particles in fluidized bed reactors? 2 How to recover solid particles from the outlet gas of a fluidized bed reactor? 3 Which dimethyl ether production process is more advanced? 4 Properties of isopentane 5 Basic knowledge of fixed-bed reactors 6 Knowledge of chemical production (39) – True or False questions 7 Knowledge of chemical production (38) – True or False questions 8 Knowledge of chemical production (37) – True or False questions 9 Knowledge of chemical production (35) – True or False questions 10 Knowledge of chemical production (34) – True or False questions 11 What is the corrosion resistance of 316-grade stainless steel? 12 Knowledge of chemical production (33) – True or False questions 13 Problems in the process management of fertilizer plants 14 Knowledge of chemical production (32) – True or False questions 15 Discharging air into flares 16 Reasons for water in gas pipelines 17 Knowledge of chemical production (31) – True or False questions 18 Knowledge of chemical production (30) – True or False questions 19 Purity of hydrogen produced by pressure swing adsorption 20 Operating principle of anti-surge valves 21 Knowledge of chemical production (27) – True or False questions 22 Issues related to the reuse of steam condensate 23 Knowledge of centrifugal pumps 24 Knowledge of chemical production (26) – True or False questions 25 Knowledge of chemical production (24) – Essay questions; answers available on floor 40 26 Essay questions on knowledge of chemical production (22); answers available on floor 20 27 Calculation of compressor suction volume 28 Essay questions on knowledge of chemical production (21) End! The answers can be found on floor 31, question 29 on Chemical Production Knowledge – Essay Questions (20); the answers are also available on floor 23, question 30 on Chemical Production Knowledge – Essay Questions (19). It’s over! The reference answers can be found on floor 14, under 31 Chemical Production Knowledge – Essay Questions (18); it’s already finished! The reference answers can be found on floor 31, under Chemical Production Knowledge – Essay Questions (17); it’s already over! The reference answers can be found on floor 25, under 33 Chemical Production Knowledge – Essay Questions (16); it’s already over! For the answer key, see question 34 on frozen saline on floor 23, and question 35 on chemical production knowledge – multiple-choice questions (15); it has been completed! The reference answers can be found on floor 19, question 36 on Chemical Production Knowledge – Essay Questions (14); it’s now over! The reference answers can be found on floor 23, question 37 on Chemical Production Knowledge – Essay Questions (13); it’s already over! The reference answers can be found on floor 22: question 38 regarding the reasons for high dust emissions from the urea granulation tower, and question 39 on chemical production knowledge – multiple-choice questions (12). It’s now over! The reference answers can be found on floor 34: Questions 40 on the causes of leakage in the steam heater head, Question 41 on whether circulating water can be used as make-up water for wet air cooling, Question 42 on issues related to the reboiler at the bottom of the wastewater stripping tower, and Question 43 on chemical production knowledge – multiple-choice questions (11). The discussion is now complete! Reference answers can be found on the 23rd floor. 44. What kind of material is Incoloy 800H? 45. Production technology for sebacic acid. 46. Scope of production technologies. 47. 2,3,5-Tribromobenzoic acid. 48. Knowledge of chemical production—Q&A questions (10). It’s now over! For the answer, see question 49 on floor 18: How is the mesh size of the filter determined? 50 Relationship between the critical fluidization velocity and the terminal velocity 51 Key design considerations for fluidized bed reactors 52 What factors should be taken into account when designing liquid-phase reactors? 53 The significance of level measurement during the installation of tower internals

This post was last edited by The wise are enlightened on 2010-1-2 22:04. Wishing all sea friends a happy New Year! 1. May I ask at which stage of the engineering construction process is foundation laying carried out? http://bbs.hcbbs.com/viewthread.php?tid=598930&page=1#pid34014222 Regulations on the selection of contractors http://bbs.hcbbs.com/viewthread.php?tid=598985&page=1#pid33984433 What are the main tasks of the project management department established by the owner in terms of construction management? http://bbs.hcbbs.com/viewthread.php?tid=595737&page=1#pid33981834 Transportation of large-scale equipment http://bbs.hcbbs.com/viewthread.php?tid=597289&page=1#pid33981105 Transportation of large-scale equipment http://bbs.hcbbs.com/viewthread.php?tid=597289&page=1#pid33981116 PMBOK http://bbs.hcbbs.com/viewthread.php?tid=599099&page=1#pid33980377 Coal-based ethylene glycol project http://bbs.hcbbs.com/viewthread.php?tid=597772&page=1#pid33977988 International bidding http://bbs.hcbbs.com/viewthread.php?tid=598192&page=1#pid33918909 Do construction companies tend to overstate the amount of materials needed? http://bbs.hcbbs.com/viewthread.php?tid=593826&page=1#pid336333610 Calculation of progress measurement weights http://bbs.hcbbs.com/viewthread.php?tid=593818&page=1#pid336322811 Which manufacturers offer ethylene for sale in the northwest region and provide ethylene transportation services? http://bbs.hcbbs.com/viewthread.php?tid=592978&page=1#pid335939712 Seeking help regarding chemical project issues http://bbs.hcbbs.com/viewthread.php?tid=593054&page=1#pid335912213 Question: When is the appropriate time to arrive at the site to provide assistance? http://bbs.hcbbs.com/viewthread.php?tid=592787&page=1#pid335727214 Division of management responsibilities and coordination among departments in large-scale project construction http://bbs.hcbbs.com/viewthread.php?tid=598930&page=1#pid340142215 Division of management responsibilities and coordination among departments in large-scale project construction http://bbs.hcbbs.com/viewthread.php?tid=598930&page=1#pid340142316 Division of management responsibilities and coordination among departments in large-scale project construction http://bbs.hcbbs.com/viewthread.php?tid=598930&page=1#pid340142417 Construction managers, take a look! http://bbs.hcbbs.com/viewthread.php?tid=591944&page=1#pid335331118 Is it necessary for the owner to approve the technical agreements signed between the design institute and suppliers in an EPC turnkey project? http://bbs.hcbbs.com/viewthread.php?tid=565189&page=1#pid335319219 Does Shell focus on coal gasification projects in China? http://bbs.hcbbs.com/viewthread.php?tid=472074&page=1#pid335053820 A summary of the main coal gasification technologies currently used in China http://bbs.hcbbs.com/viewthread.php?tid=591752&page=1#pid335052821 Why are there no windows in control rooms and cabinet rooms? http://bbs.hcbbs.com/viewthread.php?tid=591657&page=1#pid335046522 What is the difference between patent technology and proprietary technology? http://bbs.hcbbs.com/viewthread.php?tid=589699&page=1#pid333886223 Location of the project site http://bbs.hcbbs.com/viewthread.php?tid=589546&page=1#pid333881724 What are the technical origins of MTG? http://bbs.hcbbs.com/viewthread.php?tid=584129&page=1#pid333715025 Costs associated with the hydrogenation processing of coal tar http://bbs.hcbbs.com/viewthread.php?tid=569324&page=1#pid333538826 Guess what kind of device this is – Picture http://bbs.hcbbs.com/viewthread.php?tid=584563&page=1#pid333568827 IGCC – Integrated Gasification Combined Cycle http://bbs.hcbbs.com/viewthread.php?tid=580843&page=1#pid332208128 What are the development trends in natural gas chemistry? http://bbs.hcbbs.com/viewthread.php?tid=586645&page=1#pid332176029 Research on combustible ice http://bbs.hcbbs.com/viewthread.php?tid=586938&page=1#pid332175030 SW process – Ethylene production units, cracking units – Steam purging methods http://bbs.hcbbs.com/viewthread.php?tid=562394&page=1#pid332173531 Bid invitation for project equipment! http://bbs.hcbbs.com/viewthread.php?tid=586903&page=1#pid332171132 What is the indicator for establishing a quality management system for engineering projects? http://bbs.hcbbs.com/viewthread.php?tid=586807&page=1#pid332118733 Pains associated with EPC turnkey projects http://bbs.hcbbs.com/viewthread.php?tid=584836&page=1#pid331896134 Why use Japanese compressors? – It’s really frustrating http://bbs.hcbbs.com/viewthread.php?tid=585842&page=1#pid331759535 Three questions regarding quotes? http://bbs.hcbbs.com/viewthread.php?tid=585992&page=1#pid331689736 I’m going to be in charge of a project! http://bbs.hcbbs.com/viewthread.php?tid=584810&page=1#pid330869037 How can environmental protection and emission reduction projects obtain **financial support? http://bbs.hcbbs.com/viewthread.php?tid=583982&page=1#pid330693638 Third-party inspection during project construction
http://bbs.hcbbs.com/viewthread.php?tid=583996&page=1#pid330688339 Who has the “Procedures for Charging Design Fees in Petrochemical Engineering Construction Projects”?
http://bbs.hcbbs.com/viewthread.php?tid=583812&page=1#pid330232040 Sample tender documents
http://bbs.hcbbs.com/viewthread.php?tid=583431&page=1#pid330116741 How to properly prepare for the pre-handover phase of electrical works. http://bbs.hcbbs.com/viewthread.php?tid=583306&page=1#pid330113942 What if the basic design and detailed design are not done by the same team? http://bbs.hcbbs.com/viewthread.php?tid=582254&page=1#pid329419543 Which country are the materials used for manufacturing hydrogenation reactors and gasifiers generally imported from? http://bbs.hcbbs.com/viewthread.php?tid=580960&page=1#pid329010844 Comprehensive inspection of project quality
http://bbs.hcbbs.com/viewthread.php?tid=581727&page=1#pid328853645 For land used in new projects, which is more cost-effective: leasing or buying? http://bbs.hcbbs.com/viewthread.php?tid=581014&page=1#pid3283698

Posts from the production area in December. Posts from November regarding discussion topics in the production area: 1. How to separate sodium acetate from sodium bromide; 22. How to separate sodium acetate from sodium bromide; 53. How to cool down the circulating water; 84. Discoloration of products during fatty acid distillation; 25. Compilation of posts from the Production Technology Exchange Area – Recent compilation posts (34) – Torch; 26. Compilation of posts from the Production Technology Exchange Area – Recent compilation posts (34) – Torch; 57. Washing methods for acidic materials with particle sizes ranging from 200 to 400 mesh; 48. Annoying abnormal noises; 39. What books should operators of engineering plastics read? 210 What to do if the chloride ion level in the circulating water is high? 611 Do you know anything about low-carbon technologies? 812 Seeking techniques for the recovery of copper sulfate. 313 [Activity] An activity aimed at finding compounds with a structure similar to glyphosate. 814 Team leaders in production management (classic edition). 215 Can activated carbon be used to decolorize used cooking oil? 516 Issues related to solving thixotropy problems. 217 The best spray drying systems available in China. 518 Scope of production technologies. 519 Iron-based pigments. 220 Questions regarding the risks associated with liquid seals. 621 Are there any books on on-site operations in the chemical industry? 222 Structure and functions of production management departments. 323 How to install sampling valves in a way that promotes energy conservation and efficiency. 2624 For such materials, what methods can be used to remove large amounts of water from them, with low energy consumption and high efficiency? 1025 What kind of filter aid is suitable for filtering sodium bromide mother liquor? 326 Should people be given top priority in a company’s culture? 927 How can production efficiency be improved? 1328 What is the corrosion resistance of stainless steel of grade 316? 929 Issues related to heat tracing for steam and fresh water pipelines. 1030 Research and development in chemical companies. 931 How can the solubility of calcium sulfate be reduced? Questions regarding the selection of 332 filter cloth 6

In December 2009, a total of 125 posts were made; over 95% of them were posts for technical discussions. Below is a list of the titles and links for 100 of these posts. 1. How to solve the water leakage problem in wet flue gas desulfurization towers in winter? http://bbs.hcbbs.com/thread-595554-1-1.html, Page 1 ； 2. The difference between having the tailpipe of a water jet vacuum pump extend below and above the liquid surface: http://bbs.hcbbs.com/viewthread.php?tid=598721&page=1#pid3393877, Post 2 ； 3. Consultation on the selection of Roots vacuum pumps: http://bbs.hcbbs.com/viewthread.php?tid=598764&page=1#pid3393842, 2nd floor ； 4. Design and selection of steam ejectors: http://bbs.hcbbs.com/viewthread.php?tid=598782&page=1#pid3393818, 2nd post ； 5. What is a thin-film evaporator like? http://bbs.hcbbs.com/viewthread.php?tid=597970&page=1#pid3389280, 2nd floor ； 6. Regarding the differences between rotary vacuum filters and centrifugal settlers: http://bbs.hcbbs.com/viewthread.php?tid=597997&page=1#pid3389228, Post 2 ； 7. Are tension cables installed on the tower? http://bbs.hcbbs.com/viewthread.php?tid=597847&page=1#pid3389206, 6th floor ； 8. What is the approximate pressure drop during the pipeline transportation of hydrogen? http://bbs.hcbbs.com/viewthread.php?tid=597985&page=1#pid3389177, Post 5 ； 9. What type of pipe fitting is convenient and practical for connecting the tank truck to the inlet of the unloading pump? http://bbs.hcbbs.com/viewthread.php?tid=594828&page=1#pid3387426. 9th floor ； 10. Issues regarding the selection of steam valves: http://bbs.hcbbs.com/viewthread.php?tid=595801&extra=&page=2, Page 22 ； 11. Are there enamel-lined shells for film-evaporator tanks? http://bbs.hcbbs.com/viewthread.php?tid=597590&page=1#pid3386994, Page 2 ； 12. Selection of the mesh size for the pre-filter before the flow meter: http://bbs.hcbbs.com/viewthread.php?tid=597497&page=1#pid3386979, Page 4 ； 13. Questions regarding compressed air filters: http://bbs.hcbbs.com/viewthread.php?tid=597250&page=1#pid3386962, Page 4 ； 14. Regeneration of activated carbon? http://bbs.hcbbs.com/viewthread.php?tid=597105&page=1#pid3382887, 4th floor ； 15. Selection of materials for hydrogen pipelines http://bbs.hcbbs.com/viewthread.php?tid=597111&page=1#pid3382886, Page 4 ； 16. What are the reasons for the high return temperature of the cooling water at the top of the distillation tower? http://bbs.hcbbs.com/viewthread.php?tid=597039&page=1#pid3382885, 5th floor ； 17. What does it indicate when a standby pump fails to discharge liquid? http://bbs.hcbbs.com/viewthread.php?tid=593888&page=1#pid3380659, Post No. 10 ； 18. Comparison of screw chiller models: http://bbs.hcbbs.com/viewthread.php?tid=595448&page=1#pid3380643, Page 3 ； 19. For extractive distillation, are plate columns or packed columns generally used? http://bbs.hcbbs.com/viewthread.php?tid=596427&page=1#pid3380631, 5th floor ； 20. Regarding vertical pumps and horizontal pumps: http://bbs.hcbbs.com/viewthread.php?tid=596645&page=1#pid3380622, Page 2 ； 21. What are the issues with liquid feeding in a tubular heat exchanger, where the fluid enters at the top and exits at the bottom? http://bbs.hcbbs.com/viewthread.php?tid=595999&page=1#pid3377813, 3rd floor ； 22. Please recommend domestic centrifuge manufacturers: http://bbs.hcbbs.com/viewthread.php?tid=595766&page=1#pid3377801, Page 6 ； 23. Steam generation issues in incinerators http://bbs.hcbbs.com/viewthread.php?tid=594676&page=1#pid3377791, 4th post ； 24. Reboiler circulation port at the bottom of the tower: http://bbs.hcbbs.com/viewthread.php?tid=580963&page=1#pid3377784, 12th floor ； 25. How to operate an extraction tower: http://bbs.hcbbs.com/viewthread.php?tid=585810&page=1#pid3377534, Page 5 ； 26. Currently, I’m using steam at 1.6 MPa in my process. Which type of steam trap would be suitable? http://bbs.hcbbs.com/viewthread.php?tid=596005&page=1#pid3377523, 5th floor ； 27. Operation manual for desulfurization equipment: http://bbs.hcbbs.com/viewthread.php?tid=595679&page=1#pid3376644, Page 3 ； 28. Where can nitrogen oxide absorption devices be manufactured? http://bbs.hcbbs.com/viewthread.php?tid=580828&page=1#pid3372045, 4th floor ； 29. Technical assistance: Circulating cooling water in the tube side or shell side http://bbs.hcbbs.com/viewthread.php?tid=594861&page=1#pid3372043, Page 7 ； 30. Can cups made of PP material be used to drink boiled water? http://bbs.hcbbs.com/viewthread.php?tid=584424&page=1#pid3372041, post 17 ； 31. Transportation of the sheets formed by the scraper? http://bbs.hcbbs.com/viewthread.php?tid=593680&page=1#pid3370362, 4th floor ； 32. Who has used a film-evaporation evaporator? http://bbs.hcbbs.com/viewthread.php?tid=594808&page=1#pid3369958, 7th floor ； 33. Question regarding how to cool the spray liquid in a spray absorption tower: http://bbs.hcbbs.com/viewthread.php?tid=594870&page=1#pid3369951, Page 5 ； 34. Regarding the installation of heat tracing pipes: http://bbs.hcbbs.com/viewthread.php?tid=594938&page=1#pid3369942, Page 3 ； 35. Pressure and steam flow rate issues. http://bbs.hcbbs.com/viewthread.php?tid=594995&page=1#pid3369924, Page 2 ； 36. Who has a good method for dehydrating heat transfer oil furnace systems? ? http://bbs.hcbbs.com/viewthread.php?tid=593091&page=1#pid3368184, 3rd floor ； 37. 10,000 tons of liquid sulfur dioxide http://bbs.hcbbs.com/viewthread.php?tid=580341&page=1#pid3368183, Page 7 ； 38. Are there any centrifuges that are entirely made of plastic? http://bbs.hcbbs.com/viewthread.php?tid=594723&page=1#pid3368182, 2nd floor ； 39. How to increase the air delivery volume of a compressor: http://bbs.hcbbs.com/viewthread.php?tid=594708&page=1#pid3368181, Page 3 ； 40. What is the effect of adding salts in organic mixture systems? http://bbs.hcbbs.com/viewthread.php?tid=594051&page=1#pid3368179, 4th floor ； 41. What is carbon trading? http://bbs.hcbbs.com/viewthread.php?tid=594728&page=1#pid3368177, Page 2 ； 42. How to prevent gas hammer when using steam to heat circulating water http://bbs.hcbbs.com/viewthread.php?tid=594621&page=1#pid3368176, Page 6 ； 43. Which are the manufacturers of crystalline sulfuric acid? http://bbs.hcbbs.com/viewthread.php?tid=594454&page=1#pid3367375, 2nd floor ； 44. Anti-corrosion of carbon steel: http://bbs.hcbbs.com/viewthread.php?tid=593446&page=1#pid3367360, Page 5 ； 45. Design regarding the mixing of liquid in tanks: http://bbs.hcbbs.com/viewthread.php?tid=594229&page=1#pid3367347, Page 8 ； 46. Explosion-proof fans: http://bbs.hcbbs.com/viewthread.php?tid=594210&page=1#pid3367338, Page 3 ； 47. Where are the better heat pipes? http://bbs.hcbbs.com/viewthread.php?tid=593589&page=1#pid3367332, 5th floor ； 48. Advantages and disadvantages of steam vacuuming, advantages and disadvantages of water vacuuming, as well as common faults: http://bbs.hcbbs.com/viewthread.php?tid=594516&page=1#pid3367325, Page 2 ； 49. What is the typical efficiency of centrifugal pumps? http://bbs.hcbbs.com/viewthread.php?tid=594354&page=1#pid3367314, Page 5 ； 50, Installation of 350y rule fillers: http://bbs.hcbbs.com/viewthread.php?tid=594571&page=1#pid3367310, Page 2 ； 51. Does industrial methanol corrode Hastelloy C alloy? http://bbs.hcbbs.com/viewthread.php?tid=593961&page=1#pid3367294, Page 5 ； 52. Do shielded pumps belong to centrifugal pumps or positive displacement pumps? http://bbs.hcbbs.com/viewthread.php?tid=593957&page=1#pid3364621, Page 6 ； 53. Methods for measuring hydrogen flow rate: http://bbs.hcbbs.com/viewthread.php?tid=593954&page=1#pid3364598, Page 5 ； 54. How to heat steam feedwater directly? http://bbs.hcbbs.com/viewthread.php?tid=593953&page=1#pid3364583, 7th floor ； 55. Do construction companies like to overstate the amount of materials used? http://bbs.hcbbs.com/viewthread.php?tid=593826&page=1#pid3364560, 10th floor ； 56. Do vertical pipeline oil pumps belong to centrifugal pumps? http://bbs.hcbbs.com/viewthread.php?tid=593956&page=1#pid3364540, Page 7 ； 57. Material of the saltwater sump tank: http://bbs.hcbbs.com/viewthread.php?tid=594047&page=1#pid3364532, Page 2 ； 58. What type of pump is suitable for ammonia water with a concentration of over 25%? http://bbs.hcbbs.com/viewthread.php?tid=593662&page=1#pid3364528, 7th floor ； 59. What is the function of diesel demulsifiers? http://bbs.hcbbs.com/viewthread.php?tid=594048&page=1#pid3364518, Page 2 ； 60. How to learn Fluid Phase Equilibrium well? http://bbs.hcbbs.com/viewthread.php?tid=594049&page=1#pid3364502, 2nd floor ； 61. How do people conduct pressure testing and leak checks on pipelines in winter? http://bbs.hcbbs.com/viewthread.php?tid=594025&page=1#pid3364495, Page 3 ； 62. Frozen saline valve: http://bbs.hcbbs.com/viewthread.php?tid=585505&page=1#pid3344406, 6th floor ； 63. Does a water jacket count as a pressure vessel? http://bbs.hcbbs.com/viewthread.php?tid=590466&page=1#pid3344396, Page 10 ； 64. Two centrifugal pumps installed in my system are experiencing high current levels. http://bbs.hcbbs.com/viewthread.php?tid=590482&page=1#pid3344369, Page 7 ； 65. Liquid sulfur http://bbs.hcbbs.com/viewthread.php?tid=590636&page=1#pid3344346, Page 2 ； 66. Are the three atmospheric legs used for vacuum creation under positive pressure or negative pressure? http://bbs.hcbbs.com/viewthread.php?tid=272445&extra=&page=2, floor 30 ； 67. Mass measurement of liquid ammonia – it vaporizes easily; which type of gauge is suitable for this purpose? http://bbs.hcbbs.com/viewthread.php?tid=590151&page=1#pid3344311, Page 5 ； 68. Pump selection: http://bbs.hcbbs.com/viewthread.php?tid=587889&page=1#pid3340841, Page 12 ； 69. Nylon 6, Nylon 66: Use http://bbs.hcbbs.com/viewthread.php?tid=589987&page=1#pid3340792, Page 2 ； 70. Differences between multi-stage centrifugal pumps, two-stage centrifugal pumps, and single-stage centrifugal pumps: http://bbs.hcbbs.com/viewthread.php?tid=590010&page=1#pid3340764, Page 2 ； For pipes of 71 and 80 meters long containing steam at 190 degrees, is there significant expansion? http://bbs.hcbbs.com/viewthread.php?tid=589974&page=1#pid3340751, 3rd floor ； 72. Classification of liquid ammonia storage tanks: http://bbs.hcbbs.com/viewthread.php?tid=588524&page=1#pid3332315, Page 4 ； 73. The design load of the tower is low; increase the height to http://bbs.hcbbs.com/viewthread.php?tid=552791&page=1#pid3332290, 10 floors ； 74. How many hours of parking counts as long-term parking? http://bbs.hcbbs.com/viewthread.php?tid=587131&page=1#pid3322606, Page 2 ； 75. Problem of rising pressure after the standby pump is started: http://bbs.hcbbs.com/viewthread.php?tid=587129&page=1#pid3322603, Page 3 ； 76. Displacement inside the tower: http://bbs.hcbbs.com/viewthread.php?tid=586455&page=1#pid3318429, Page 3 ； 77. Selection of 37% formaldehyde level gauges: http://bbs.hcbbs.com/viewthread.php?tid=586439&page=1#pid3318414, Page 4 ； 78. On the selection of pump materials: http://bbs.hcbbs.com/viewthread.php?tid=585377&page=1#pid3318410, Page 7 ； 79. Are fire alarm systems necessary in Class A, Class B, and Class C factories? http://bbs.hcbbs.com/viewthread.php?tid=586292&page=1#pid3318388, Page 4 ； 80. Which brand of glass-lined reactors has better quality? http://bbs.hcbbs.com/viewthread.php?tid=478671&page=1#pid3314781, page 17 ； 81. Regarding pipeline insulation issues: http://bbs.hcbbs.com/viewthread.php?tid=522074&page=1#pid3314777. 10th floor ； 82. Can steam be used for the vaporization of liquid ammonia? http://bbs.hcbbs.com/viewthread.php?tid=584613&page=1#pid3307315, Page 3 ； 83. What is the required pressure for sulfur heating steam? http://bbs.hcbbs.com/viewthread.php?tid=455532&page=1#pid3307314, 11th floor ； 84. Heat exchangers using heat transfer oil as a heat source: http://bbs.hcbbs.com/viewthread.php?tid=583537&page=1#pid3303947, Page 6 ； 85. Operations related to shutting down pumps in long-distance pipelines: http://bbs.hcbbs.com/viewthread.php?tid=581948&page=1#pid3302611, Page 5 ； 86. Is the inlet pressure of a centrifugal pump positive or negative? http://bbs.hcbbs.com/viewthread.php?tid=583708&page=1#pid3302327, 5th floor ； 87. Methods and steps for breaking the vacuum in a vacuum distillation tower: http://bbs.hcbbs.com/viewthread.php?tid=583803&page=1#pid3302326, Page 4 ； 88. Advantages and disadvantages of hot water tracing and steam tracing http://bbs.hcbbs.com/viewthread.php?tid=583853&page=1#pid3302317, Page 5 ； 89. The quality of thermal energy: http://bbs.hcbbs.com/viewthread.php?tid=582352&page=1#pid3300253, Page 5 ； 90. What are the main tasks in the early stage of a project? http://bbs.hcbbs.com/viewthread.php?tid=577922&page=1#pid3300192, 10th floor ； 91. When conducting a pressure test on a vessel at normal pressure, should the test pressure be the design pressure or 1.15 times the design pressure? http://bbs.hcbbs.com/viewthread.php?tid=582998&page=1#pid3300178, Page 6 ； 92. Problems with centrifugal pumps: http://bbs.hcbbs.com/viewthread.php?tid=582853&page=1#pid3298805, Page 5 ； 93. 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