English — Forum #337 (Page 28/163)

1. Why are spiral nozzles designed to be spiral-shaped? - HCBBS Forum
2. What is the difference between a butterfly head and an elliptical head? What are the differences in application scenarios? - HCBBS Forum
3. Expert advice: Selection and control of condensate pump in condensate recovery systems - HCBBS Forum
4. Is there a valve to prevent water hammer that allows steam to pass through and water to stay out? - HCBBS Forum
5. What are commodity-grade hex head bolts - HCBBS Forum
6. Cabinets are not allowed in Class A and B workshops, but if complete sets of equipment come with their own control cabinets that are placed in such workshops, who will be held responsible in the event of an accident? - HCBBS Forum
7. \"Design of Oil and Gas Gathering, Transportation, and Processing Processes\" - HCBBS Forum
8. Does anyone know any standards or process flow diagrams related to the vaporization of liquid ammonia? Please share them, thanks! - HCBBS Forum
9. Do all Class A liquid storage tanks require safety valves for discharge in case of a fire? - HCBBS Forum
10. Static electricity issues with fluorinated lining pipes and equipment - HCBBS Forum
11. Process flow of synthetic graphite - HCBBS Forum
12. How should check valves be selected for the inlet and outlet pipelines of a reciprocating vacuum pump? - HCBBS Forum
13. What are good ways to remove bubbles from wastewater? Use a reducing agent as a filler? - HCBBS Forum
14. Filter velocity of mechanical filters - HCBBS Forum
15. Powder pneumatic conveying systems and equipment - HCBBS Forum
16. Are manual valves required before and after the belt-type fan in exhaust gas treatment? Same as for pump inlet and outlet - HCBBS Forum
17. The burst disc comes with its own signal line, which is led out through an opening in the clamp - HCBBS Forum
18. Input for the batch reactor Rbatch in Aspen - HCBBS Forum
19. Which company is responsible for the design and technology related to pentaerythritol at Guizhou Kailin? - HCBBS Forum
20. Class A tank area air dryer principle - HCBBS Forum
21. For an open rectangular tank with aeration at the bottom and exhaust gas to be collected at the top, what type of cover is the most cost-effective to use? - HCBBS Forum
22. How is the volume of EHA elliptical heads with different heights calculated? Is there a table available for reference? - HCBBS Forum
23. Calculate the maximum lifting height of liquid ammonia in one-eighth of a pipe - HCBBS Forum
24. Introduction to the burners in the cracking furnace of ethylene plants - HCBBS Forum
25. Boiling point of methanol at 25 MPa and 200°C - HCBBS Forum
26. Should steam condensers be considered pressure vessels? - HCBBS Forum
27. 【Principles of Chemical Process Safety Design】Pressure Vessels - HCBBS Forum
28. Gasifier process package - HCBBS Forum
29. Magnetostrictive level gauge jump - HCBBS Forum
30. Issues with temporary power usage - HCBBS Forum
31. Sharing of teaching materials for registered chemical engineer professional examination - HCBBS Forum
32. Should very small sampling valves or sampling devices be installed on fluorinated piping? And what about the sampling devices used for carbon steel piping? - HCBBS Forum
33. Why are the safety valve vents in chemical plants always inserted at an angle into the flare header? Can it not be inserted at an angle? - HCBBS Forum
34. Negative pressure dehydrogenation for the production of styrene – Control of the mixture content in styrene - HCBBS Forum
35. What do the markings on valves in P&ID diagrams mean? - HCBBS Forum
36. Instructions for the installation and operation of second-hand multi-effect or MVR evaporators - HCBBS Forum
37. Should a shell-and-tube heat exchanger be insulated? - HCBBS Forum
38. “Distillation Simulation” by Song Haihua - HCBBS Forum
39. I would like to ask: there should be no negative pressure in pressure vessels, right? Is there a valve that can eliminate negative pressure? - HCBBS Forum
40. How should one deliver items when doing business? Can it only be sent out then? Are there any tips? - HCBBS Forum
41. What is the reason why a pulse signal must last for 2 seconds? - HCBBS Forum
42. I need to prepare a solution using 500 kg of sodium chloride per day. Can sodium chloride be transferred using silos and screw conveyors, or via pneumatic transport? - HCBBS Forum
43. Issues regarding the provision of subcooling protection for liquid pipelines - HCBBS Forum
44. What is the difference between basic design and preliminary design? - HCBBS Forum
45. Coating material for the inner wall of propylene oxide carbon steel storage tanks - HCBBS Forum
46. L-carnitine - HCBBS Forum
47. Can a interlock quick cut valve be equipped with a bypass line? - HCBBS Forum
48. Magnetic pumps, metering pumps, shielded pumps, pneumatic diaphragm pumps, ordinary centrifugal pumps, screw vacuum pumps, Roots vacuum pumps, water ring vacuum pumps, reciprocating vacuum pumps – for these types of pumps, there’s basically no need to prepare spare parts, right? - HCBBS Forum
49. Certification is required to operate the reaction processes in polymerization; what about condensation? - HCBBS Forum
50. Steel plant chimney exhaust temperature - HCBBS Forum
51. For acidic gases, should activated carbon be used after spraying with alkali followed by water, or after spraying with water first and then alkali? Why? - HCBBS Forum
52. Jiangsu Province’s safety regulations for nitration processes - HCBBS Forum
53. How can saturated steam at 6 kg be used to produce superheated steam at around 130 degrees in a DN65 pipeline? Urgent! Urgent! Urgent! ! ! - HCBBS Forum
54. For 10-class flammable liquid storage tanks, it is necessary to keep the storage temperature below 20 degrees. What measures can be taken in summer to ensure this? - HCBBS Forum
55. Could you recommend any manufacturers that produce high-quality air coolers (finned coolers)? - HCBBS Forum
56. How to enter the following substances in Aspen? - HCBBS Forum
57. The storage tank has three layers; it is heated using Miller plates, and its exterior is insulated with stainless steel. What are Miller plates? What is the purpose of this type of storage tank? - HCBBS Forum
58. Is it necessary to install blast vents on exhaust pipes? - HCBBS Forum
59. What is the principle of the pressure tank at the pump outlet? - HCBBS Forum
60. Is the emergency vent valve of the spherical tank an automatic valve or a manual valve? - HCBBS Forum
61. Where can I buy the PTFE material used inside the steel-lined PTFE products? Are there any recommended manufacturers of high-quality PTFE materials, both domestic and international? - HCBBS Forum
62. Calculation of steam consumption in atmospheric thermal deaerators - HCBBS Forum
63. 【Exclusive Release】The “Handbook of Domestic and Foreign Metal Materials” includes a comparison table of material grades from various countries - HCBBS Forum
64. What is the required nitrogen pressure in front of the nitrogen supply valve for nitrogen sealing? - HCBBS Forum
65. Can the instrument alarm of a stationary device be disabled? - HCBBS Forum
66. There is a pasty, slightly viscous precipitate in sulfuric acid; how can it be separated? - HCBBS Forum
67. Can an emergency relief manhole be used for horizontal nitrogen-sealed low-pressure methanol tanks in the context of fire scenarios? - HCBBS Forum
68. Issues regarding differential pressure, vortex flow meters, mass, electromagnetic methods, and flow meter range expansion! - HCBBS Forum
69. What are the hazards of not draining condensate from steam pipes? - HCBBS Forum
70. PDMS isometric drawing direction arrow (pictured) - HCBBS Forum
71. How should carbon dioxide and nitrogen be stored and used after being purchased? Should it be classified as Category B? - HCBBS Forum
72. At what concentration does an aqueous acrylate solution cease to be a hazardous chemical? - HCBBS Forum
73. Level control of tank V1101 - HCBBS Forum
74. The pressure of the leakage gas from the dry gas seal of the GE compressor is 0.1 Mpa; there is a safety valve that activates at 6.5 Mpa before that pressure is reached. Why is that? - HCBBS Forum
75. When saltwater evaporates, will the water that remains contain salt? - HCBBS Forum
76. Deep cooling in ethylene plants - HCBBS Forum
77. I have 3 methanol tanks with a capacity of 20 cubic meters for a wastewater treatment project. If pressure pipelines and pressure vessels are not involved, is it possible to prepare design drawings under Class B environmental protection standards? - HCBBS Forum
78. Has anyone used the electrochemical treatment process for circulating water? - HCBBS Forum
79. Are there any online instruments that can measure the moisture in exhaust gases, especially free water? - HCBBS Forum
80. PID automatic control (with diagram) - HCBBS Forum
81. Compilation of Chemical Engineering Technologies - HCBBS Forum
82. May I ask if the duct for the fresh air valve (intake air valve) of the blower needs to be routed outside the workshop? - HCBBS Forum
83. What qualifications are required for the installation unit of pressure pipelines? What inspections are needed after installation? Are approval procedures required? - HCBBS Forum
84. 【hcbbs】Reference compilation of the national design institute directory – free to share - HCBBS Forum
85. Does reducing steam pressure lower the temperature? - HCBBS Forum
86. Regarding the assessment of acute toxicity? - HCBBS Forum
87. That expert has procedures for the maintenance of petrochemical equipment - HCBBS Forum
88. 【Haichuan Equipment Guessing Game】The first domestically produced version – **shortens the process** - HCBBS Forum
89. Regarding pneumatic valves and electromagnetic flowmeters used for hazardous media, are there any differences in process interfaces between WN-RF and PLRF? - HCBBS Forum
90. Convert 1 ppm to milligrams per liter - HCBBS Forum
91. UASB treatment - HCBBS Forum
92. Acetylene gas purification - HCBBS Forum
93. Mechanical seal leakage standard - HCBBS Forum
94. Chloropropene process package - HCBBS Forum
95. Does Jinneng Chemical have an advantage in terms of energy consumption for 900,000 tons of PDH production? - HCBBS Forum
96. Regarding process cards - HCBBS Forum
97. May I ask, for a steam pipeline with DN200, can an 8-character blind plate be used as a shut-off device during maintenance? - HCBBS Forum
98. How can the actions of valves controlled by step-by-step sequencing in a PLC program be represented in a PID control system to manage the control process? - HCBBS Forum
99. Is it necessary to install an explosion vent in an activated carbon adsorption box for exhaust gases? - HCBBS Forum
100. For waste gas treatment systems installed in chemical plants that meet emission standards, what is the appropriate load classification for power supply, and what is the required lightning protection level? - HCBBS Forum