English — Forum #723 (Page 521/642)

1. One post per day to learn about occupational health - HCBBS Forum
2. What are the manufacturers of electromagnetic cut-off valves, those made in China? - HCBBS Forum
3. Issues with modifications by the user’s unit - HCBBS Forum
4. Constant pressure principle of blowers - HCBBS Forum
5. Issues regarding the installation of eye wash stations in chemical manufacturing enterprises - HCBBS Forum
6. With the approval of CMTX technology, another pathway for coal-based olefins has been established, which can complement MTO and MTP - HCBBS Forum
7. How to assign personnel for the inspection and maintenance of pressure pipelines in chemical plants - HCBBS Forum
8. The power supply board is overheating - HCBBS Forum
9. Why is direct current used in the control circuit of high-voltage motors? - HCBBS Forum
10. For young parents, how much time should we set aside each day after work to spend with our children? - HCBBS Forum
11. How to consider fire separation distances in the closed-design of liquid chlorine storage tanks - HCBBS Forum
12. Material of the flushing ring - HCBBS Forum
13. 【Daily Question】Question from Issue 20150922 - HCBBS Forum
14. 【Help】How to calculate the heat transfer coefficient of a glass-lined tank? - HCBBS Forum
15. Who has an introduction to the utility systems for space furnaces? - HCBBS Forum
16. What is the purpose of a water jacket in a gasification furnace? - HCBBS Forum
17. Selection of flowmeter lining for low-concentration sulfuric acid - HCBBS Forum
18. Carbon supplementation in methanol production from coke oven gas - HCBBS Forum
19. Doubts about distillation column operation - HCBBS Forum
20. I have two questions regarding compressors? - HCBBS Forum
21. Double-flange level gauge - HCBBS Forum
22. What kind of welding technique is medium-frequency induction welding? What are the advantages of using it to weld products, and what does the welded joint look like? - HCBBS Forum
23. Maintenance of low-voltage distribution cabinets - HCBBS Forum
24. Experiment on adding water to 93# gasoline - HCBBS Forum
25. What is the main function of a saltwater pretreater? - HCBBS Forum
26. What type of reboiler is suitable for the solvent regeneration tower? Siphon or kettle-type? - HCBBS Forum
27. What are global environmental problems? - HCBBS Forum
28. 【Daily Question】0913: Into which main sections is a complete tower divided? - HCBBS Forum
29. Pressure swing adsorption oxygen production technology was applied for the first time in the glass bottle manufacturing industry - HCBBS Forum
30. I’m not quite understanding a few issues related to the two-in-one synthesis furnace; I need help. - HCBBS Forum
31. What are the advantages of a two-stage sodium ion exchange system compared to a single-stage sodium ion exchanger? - HCBBS Forum
32. Vacuum pump - HCBBS Forum
33. Grounding issue with three-wire alarms? _? - HCBBS Forum
34. Before the sulfur deacidification plant is put into operation, do the pipes need to be pickled with acid or cleaned with alkali? Is water intermodal transport still needed? - HCBBS Forum
35. What is the difference between leading a shift and being on duty? Different job responsibilities? Are the task requirements different? - HCBBS Forum
36. 【Weekly Question】Describe the wear of metal components in circulating fluidized bed boilers? - HCBBS Forum
37. 2015 First-Class Constructor Exam – looking for comfort - HCBBS Forum
38. Methods to prevent voltage fluctuations in chemical production - HCBBS Forum
39. The awkward thing that happened last night. . . - HCBBS Forum
40. What are the ecological studies on environmental pollution? Please specify. - HCBBS Forum
41. Pressure testing of large-diameter circulating water pipes: Can large-diameter butterfly valves be used as blind flanges for pressure testing? - HCBBS Forum
42. 7. How does oxygen shear the coal slurry? - HCBBS Forum
43. 32. Which manufacturers’ oxygen flow control valves are most commonly used? What is their performance? What are the typical pressure differences before and after the valve, as well as the valve position? - HCBBS Forum
44. As the weather gets colder, will the oil and coal markets improve? - HCBBS Forum
45. 【Weekly Question】Those who answer correctly receive 6 wealth points, while those who participate earn 3 wealth points； Close this post every Sunday - HCBBS Forum
46. Fundamentals of Chemical Engineering: One Question per Day – Pump Head - HCBBS Forum
47. Can a catalytic combustion type combustible gas detector measure several types of combustible gases at the same time? - HCBBS Forum
48. What should be done with the chloromethane released by the safety valve of the chloromethane storage tank? - HCBBS Forum
49. Water content in low-temperature methanol washing - HCBBS Forum
50. 【Daily Question】Test Issue 20150915 - HCBBS Forum
51. Use and classification of gas masks - HCBBS Forum
52. Ways to follow Haiyou - HCBBS Forum
53. Piping design pressure - HCBBS Forum
54. Is it necessary to use a dust extraction hood when performing TIG welding? - HCBBS Forum
55. What pump should be used to transfer material containing 10% solid particles? - HCBBS Forum
56. Question 37, multiple-choice question on boiler foundations on September 20: (A certain score will be given to the top 40) - HCBBS Forum
57. 【Daily Question】Issue 20150923 Test - HCBBS Forum
58. Emergency! - HCBBS Forum
59. 【Home.Life.Life Edition】Daily Question Summary Post - HCBBS Forum
60. Thermal engineering of steam turbines - HCBBS Forum
61. What is the maximum temperature that the 12Cr1MoVG material used in main steam pipes can withstand? How long can it last? - HCBBS Forum
62. How should the dense packing system used at the start-up of catalytic cracking be coordinated with the purging of other process pipelines, and is there a sequence to follow? ? Please - HCBBS Forum
63. If it is found that the flange’s steel stamp lacks the factory mark and furnace batch number, what should be done if the flange is rejected? - HCBBS Forum
64. Registered Fire Engineer - HCBBS Forum
65. Weekly topic: 5 Wealth points for those who answer correctly, 2 Wealth points for participation； Question 173 - HCBBS Forum
66. What are the precautions for safe production in autumn? - HCBBS Forum
67. 【Daily Question】Wastewater Knowledge - 9.22 (2 points for answering, 4 points for a correct answer) - HCBBS Forum
68. 【Safety & Environment Section】Special thread for applying for expense subsidies for events (trial) - HCBBS Forum
69. 15. What are the hazards of excessive H2S in the feed gas for low-temperature methanol washing? - HCBBS Forum
70. What are the chemical engineering design institutes in Tianjin? - HCBBS Forum
71. What impact do highly viscous materials have on control valves, flow meters, pressure gauges, and similar devices in pipelines? - HCBBS Forum
72. I would like to ask if there are any standard classification systems for venturi mixers? - HCBBS Forum
73. Why is the wet-bulb temperature defined as not exceeding 40 degrees? - HCBBS Forum
74. Selection of fan types - HCBBS Forum
75. What are the materials used for the bubbles in a bubble column? - HCBBS Forum
76. How to change the single-acting cylinder valve from fo to fc - HCBBS Forum
77. After discharging from the reactor, the small amount of material remaining at the edge of the tank will accumulate at the bottom valve - HCBBS Forum
78. 【Weekly Topic】Maintenance of Liquid Sulfur Tank - HCBBS Forum
79. How to adjust a gas chromatograph to monitor certain gases? - HCBBS Forum
80. What materials does a company need to prepare for the acceptance inspection after safe trial production? - HCBBS Forum
81. Regarding the methods for oil and vapor recovery in the triphenyl tank area - HCBBS Forum
82. Instrument repairman and having a baby - HCBBS Forum
83. Top two and bottom two - HCBBS Forum
84. Who is the best person to carry out the maintenance? - HCBBS Forum
85. [Repost] Has anyone been scammed like this? - HCBBS Forum
86. All trial production of hazardous chemicals in Shandong Province has been halted - HCBBS Forum
87. Some questions regarding chemical phosphorus removal; seeking advice - HCBBS Forum
88. Should a mother have such love for her child? - HCBBS Forum
89. Regarding process management - HCBBS Forum
90. September 13: Boiler Basics – 30 True/False Questions 2: (A certain score will be given to the top 40) - HCBBS Forum
91. 【Daily Question】9.15 Reply +2； To +3 - HCBBS Forum
92. System airtightness - HCBBS Forum
93. Consult about the water scrubber tower - HCBBS Forum
94. Issues regarding the determination of total phosphorus in circulating water - HCBBS Forum
95. Distillation purification of trimethylaluminum?? - HCBBS Forum
96. Membrane pole distance in proton membrane electrolyzers and chlorate decomposition cells - HCBBS Forum
97. Indicators for the content of heavy metals in catalytic cracking feedstocks - HCBBS Forum
98. For what type of medium storage tanks is it necessary to lead the flame arrestor vent outside? - HCBBS Forum
99. Issues regarding the determination of iron content in tap water using a spectrophotometer - HCBBS Forum
100. Reciprocating compressors operating in parallel - HCBBS Forum