Selection of instrument process connections under high temperature and pressure conditions
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This post was last edited by A Entropy on 2022-7-21 at 09:57. I just received the relevant materials yesterday; I need to select some instruments, mainly for measuring temperature and pressure. After checking the operating conditions, I saw that they involve high temperatures and pressures, something I haven’t dealt with before. In previous operations, the temperature was kept below 200 degrees Celsius and the pressure below 2 MPa. There were also guidelines provided by those who worked there before. Now it’s a new system, and from what I can see, the temperature range is 0–400 degrees Celsius, while the pressure ranges from 0–30 MPa; in some cases it even reaches 40 MPa. Under such high temperature and pressure conditions, the pressure gauges used previously had M20 thread connections. But at a pressure of 30 MPa now, can’t it be connected in this way anymore? Does one have to use flange connections instead? Are there any special requirements as well for pressure transmitters? And the temperature is also much higher than before? I hope the seniors can give me some advice. Thank you.
M20*15 is also fine for 100 MPa, and M20 is also suitable for 1000 degrees
High dielectric temperature affects the proper performance of electronic devices. A split installation is adopted under high-temperature conditions. Avoid direct exposure to high temperatures.
1000 degrees Celsius? Do you confirm that threaded connection is feasible at 1000 degrees Celsius?
This post was last edited by Ding Xiaoshuai on 2022-7-21 at 14:08. I’m not sure about pressure gauges, but threaded connections for thermocouples and temperature transmitters should be fine. :D I’m not sure if it’s feasible if high temperature is accompanied by high pressure as well
Please don’t be vague again. What you said in the previous post is fine; so that means that under the aforementioned pressure of 100 MPa, it’s also okay even at a temperature of 1000 degrees Celsius, right? Is that how I should understand it? How can you say you don’t know again? What can the original poster do about this?
This post was last edited by qugd on 2022-7-21 at 14:50. Whether it is pipe and valve fittings for instruments, or those used in process pipelines and equipment, the pressure and temperature constraints on their connection methods are detailed in the relevant standards for such fittings; based on your specific situation, you should be able to find the appropriate reference information. It is recommended that the original poster consult the contents of the national standard GB/T 9124, and seek the latest version. There, information is provided on the material of the connectors, their pressure ratings, and the maximum allowable temperature ranges. As the temperature rises, the applicable limits for pressure ratings decrease significantly; otherwise, safety cannot be ensured. Those opinions that claim there are no problems right from the start are either the result of thoughtless statements, which is very irresponsible ； Either they simply don’t have any brains to function with, in which case they have no understanding of the complexity of chemical processes and the high standards required for safety.
:Lol, after all, the pressure and temperature in the original post’s situation aren’t that high either. . . . With the current cooling measures in place, threading connection works fine for him: lol, please spare me. If you get it wrong, give me a lesson{:1_90:}
You’re being unreasonable and stubborn; as for people like you and your attitude toward others, I’ll try not to say anything more