English — Forum #337 (Page 21/163)

1. Installation of dual isolation valves - HCBBS Forum
2. Production process of diethyl sulfate - HCBBS Forum
3. How should clause 5.2.22 of the petrochemical regulations be understood – namely that if the total volume of flammable liquids in the storage tanks of a facility is less than 1,000 cubic meters, such tanks can be located within the facility? - HCBBS Forum
4. Where do the relief valves and emergency relief manholes go in your factory? - HCBBS Forum
5. Can a steam trap be used as a gas-liquid separator? - HCBBS Forum
6. Casali synthesis tower - HCBBS Forum
7. Compressor – Calculation of cooling water volume - HCBBS Forum
8. May I ask for recommendations of manufacturers that produce metal fans with a spark-proof design conforming to AMCA Class “B” standards? - HCBBS Forum
9. Blowing of the jacket - HCBBS Forum
10. sp3d part-time job - HCBBS Forum
11. May I ask that for storage tanks filled with substances such as methanol at room temperature and under nitrogen sealing, where the volume is not large, can square carbon steel welded tanks be used? - HCBBS Forum
12. Vapor-liquid equilibrium diagram - HCBBS Forum
13. The manufacturers of pneumatic valves fix the triple union on the valves produced without taking into account the actual installation methods – whose responsibility is that? - HCBBS Forum
14. If the operating pressure and operating temperature are at atmospheric pressure and room temperature, is it correct to write atmospheric pressure and room temperature for the design pressure and temperature as well? - HCBBS Forum
15. Dear netizens, which chemical processes that are under strict supervision are included in the chemical reaction equations below? - HCBBS Forum
16. Are there any requirements regarding the distance between carbon dioxide storage tanks and buildings, as well as between such tanks and ordinary factory buildings in Class A, Class B, and regular factories? - HCBBS Forum
17. Adiponitrile production process - HCBBS Forum
18. There are 5 sight glasses on the negative pressure distillation tower; how can the risk of these sight glasses breaking be addressed? - HCBBS Forum
19. Process calculation sheet - HCBBS Forum
20. What specific aspects should be paid special attention to when evaluating bids for the purchase of pneumatic on-off valves and control valves? - HCBBS Forum
21. Do hazardous waste items fall under the category of hazardous chemicals in the \"Catalogue of Hazardous Chemicals\" (2015 edition)? - HCBBS Forum
22. How do I bring up this CAD extension tool menu? - HCBBS Forum
23. Could you please explain how the vacuum pump is used in oil and gas recovery, and what level of vacuum needs to be achieved? - HCBBS Forum
24. Steam generator cooking - HCBBS Forum
25. Is it mandatory to install 2 remote level gauges in the hydrogen peroxide storage tank? - HCBBS Forum
26. [Help] Do any experts have good methods for simulating the recovery of dilute formaldehyde? - HCBBS Forum
27. Regarding the differences in names, quantities, and respective functions of technical documents during project construction - HCBBS Forum
28. The top of the hydrostatic sludge discharge pipe must be above the water surface of the sedimentation tank. Why is this? - HCBBS Forum
29. Instrument air is supplied to the oxidation unit of the maleic anhydride plant - HCBBS Forum
30. Is there any requirement regarding the distance between the fluoride removal chemical dosing plant and the power distribution room? Which provision? - HCBBS Forum
31. Are there pneumatic valves that can be placed underwater? - HCBBS Forum
32. Is there a cover that can isolate the aeration head, allowing air to pass through while creating a liquid seal to prevent outside substances from entering? - HCBBS Forum
33. Is the amount of steam produced the same under different pressures? - HCBBS Forum
34. Why are two columns in series usually used in extractive distillation? - HCBBS Forum
35. Regarding the drawing of steel-lined pipes, how can we ensure accuracy in the drawings, given the deviations between valve sizes, instrument sizes, etc., and the actual values? - HCBBS Forum
36. For steel atmospheric open sedimentation tanks used in water treatment, is it necessary to perform flaw detection on these tanks in accordance with standards? - HCBBS Forum
37. Are there regulations specifying how high the cofferdam for acid and alkali storage tanks should be? Is it necessary to have a storage capacity that can hold the tanks? - HCBBS Forum
38. I keep getting fatal errors when opening CAD 2020 on my computer, but what issues can be identified by using CAD on a mobile phone? - HCBBS Forum
39. Is a steam temperature and pressure reducer essential equipment? - HCBBS Forum
40. Are there any good design references or software available for calculating the air pressure balance in exhaust gas collection duct systems? - HCBBS Forum
41. How is the diameter for nitrogen sealing of atmospheric pressure tanks calculated? Are there any other relevant standards besides 3007? - HCBBS Forum
42. When two standards are conflicting with each other, which one should be followed? What is the basis? - HCBBS Forum
43. I’ve never understood whether it’s better to install the valve and flexible coupling at the pump inlet before or after the diameter reduction at that point - HCBBS Forum
44. How to convert ppm to % - HCBBS Forum
45. Pump-induced floor resonance issue? - HCBBS Forum
46. In SolidWorks, after selecting a component I right-clicked to hide it; how do I make all components visible again? - HCBBS Forum
47. Can expansion joints be installed on steam pipelines? - HCBBS Forum
48. Completed - HCBBS Forum
49. The exhaust gas needs to be condensed using chilled water at -25 degrees Celsius. What methods can be used to prevent and address frost formation on the heat exchanger? - HCBBS Forum
50. Why does the hydrophobicity issue persistently plague many companies - HCBBS Forum
51. What standards are followed for soil-buried tanks on the ground? - HCBBS Forum
52. Is there any specification stating that a high-level tank must be equipped with an on-site level gauge? - HCBBS Forum
53. Evaporator operating liquid level height - HCBBS Forum
54. I have a question: In CAD, the black text in the box appears only when a point is highlighted; it disappears again once the highlight is removed. What is this feature for? - HCBBS Forum
55. Fire foam pipeline - HCBBS Forum
56. How do airflow and wind pressure change when the fan is placed at different altitudes? - HCBBS Forum
57. The manager asked me to calculate the flow rate of the circulating water in the reactor; please help - HCBBS Forum
58. Considerations regarding the relief operation of safety valves. - HCBBS Forum
59. Are there any differences between butt-welded and socket-welded flanges for steel pipes lined with plastic or PTFE? - HCBBS Forum
60. Fire protection design standards - HCBBS Forum
61. For saline wastewater with chloride levels in the tens of thousands, which type of steel has good resistance to chlorides? - HCBBS Forum
62. Regarding the treatment of methamine wastewater, since methamine is classified as Category A, does that mean the entire factory building also has to be classified as Category A? - HCBBS Forum
63. Sulfurous acid solution is oxidized to sulfuric acid solution - HCBBS Forum
64. For the wastewater discharged from the spray tower, is it better to have a separate outlet at the exit of the spray pump, or to install an automatic drain valve in the circulation water tank? - HCBBS Forum
65. Since there is a large amount of hydrogen peroxide in the wastewater treatment workshop, aeration is required to remove it; should this workshop be classified as Category A? - HCBBS Forum
66. May I ask whether a condenser is still needed for the exhaust gas from the storage tank after it has been nitrogen-sealed with methanol or ethanol? - HCBBS Forum
67. Are there any **standard specifications or industry standards** for PPH pipes and tubing? - HCBBS Forum
68. Activity of iron and aluminum - HCBBS Forum
69. How can the project’s business expenses be covered? - HCBBS Forum
70. Are the manual valve clutch device and the accompanying handwheel the same thing? If not, what’s the difference? - HCBBS Forum
71. 9. How can a SolidWorks 3D model be imported into CAD 3D to be used directly as a CAD 3D model? - HCBBS Forum
72. JetBlack Light Dust Station: There is hope for controlling pneumoconiosis! - HCBBS Forum
73. Is it necessary to install a nitrogen inlet pipe for the nitrogen-sealed storage tank? Can it be blown directly at Class A liquids? - HCBBS Forum
74. How to recover the oil and gas from the exhaust pipe of the turbine oil tank - HCBBS Forum
75. Regarding the use of two towers in parallel for exhaust gas adsorption, what methods can be employed to ensure an even distribution of the exhaust gas flow between these two parallel towers? - HCBBS Forum
76. I would like to ask about the dechlorination process technology for compound fertilizers - HCBBS Forum
77. How to determine the pipeline purging speed in chemical plants - HCBBS Forum
78. I would like to ask: for corrosive waste gas/vapor condensers, is it better for the waste gas/vapor to flow through the shell side or the tube side? - HCBBS Forum
79. Resin specifically designed for filter elements in water softening systems - HCBBS Forum
80. Are there any sleeve assemblies with flanges that come equipped with self-cleaning sight glasses available? - HCBBS Forum
81. I would appreciate your guidance on some issues affecting the system when the purity of recycled hydrogen decreases and the flow rate of mixed hydrogen increases in a hydrocracking unit - HCBBS Forum
82. Design temperature - HCBBS Forum
83. Which instruments in Class A workshops, such as pressure transmitters, thermometers, pneumatic valves, level switches, etc., need to be intrinsically safe? - HCBBS Forum
84. How can the vaporization latent heat of commonly used mixed refrigerants such as R404A be looked up? - HCBBS Forum
85. Principles of distillation - HCBBS Forum
86. How can pH be precisely controlled using a pipeline mixer, with an accuracy of up to 0.1? - HCBBS Forum
87. Is it in compliance with the regulations for a small device used for the adsorption and recovery of hydrochloric acid to also be classified as Category A, and to be placed in the external corridor outside another unrelated Category A workshop? - HCBBS Forum
88. In the production of ammonium sulfate using a spray saturator, the mother liquor heater - HCBBS Forum
89. Seeking information on the vaporization temperature of propane - HCBBS Forum
90. The ASPEN calculation result data is not displayed as shown in the figure - HCBBS Forum
91. At neutral temperature and without considering other factors, what concentration of chloride ions can duplex steel withstand? - HCBBS Forum
92. How should the accuracy of instruments such as pressure transmitters, temperature transmitters, and level sensors be selected? Are there any guidelines? - HCBBS Forum
93. I need to heat 500 cubic meters per hour by 5-10 degrees. What are some good solutions? If a heat exchanger is to be used, which type would be suitable? - HCBBS Forum
94. Simulation of the absorption tower in an acrylonitrile plant - HCBBS Forum
95. Are there any good websites for finding project information, business information, and for carrying out business activities? Hope it gets recommended! - HCBBS Forum
96. Volume calculation - HCBBS Forum
97. Online measurement method for the concentration of dilute sulfuric acid containing organic matter - HCBBS Forum
98. Is there any communication group for people in the chemical industry? Could you add me? - HCBBS Forum
99. A saturation vapor pressure table for epichlorohydrin at various temperatures is needed - HCBBS Forum
100. What is explosion-proof insulation for pipelines, and what are the specific requirements and methods? - HCBBS Forum