Process Engineering Division – Instrumentation and Automation Section – Daily Question – Question from 2020-11-11
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Process Engineering Division – Instrumentation and Automation Section – Daily Question – Question from 2020-11-11: Discussion question: 293. Please list the instances of improper installation of instrument pressure tubes that you have seen
You can refer to the following post: Series of posts on preventing common problems in instrument installation (updated dynamically----10.28) https://bbs.hcbbs.com/thread-3067732-1-1.html
The last edit to this post was made by yyszyj on 2020-11-11 at 08:13. For pressure pipelines, the issues include too many bends, pressure-taking devices located at bends or dead ends, pressure-taking pipes extending into the fluid, the isolation valve being too close to the pressure-taking device, and the installation of the pressure conduit not ensuring an appropriate inclination
The instrument pressure guide tubes were not cleaned or purged before installation; no secondary purging was carried out after the airtightness test, and no expansion compensation bends were used during installation
Too many bends, incomplete drainage, uneven laying, etc
The main issues are: some pipelines are too long, which can lead to blockages； Some installation requirements stipulate that the surface should not be level ； Turning too much or too little ； The installed condenser and gas collector are not appropriate; the safety features of the three-valve assembly are incorrect, etc.
The instrument pressure guide tubes were not cleaned or purged before installation; no secondary purging was carried out after the airtightness test, and no expansion compensation bends were used during installation
Leaks, improper size of the sleeve, lack of protective welding, warping, messy arrangement
The instrument pressure guide tubes were not cleaned or purged before installation; no secondary purging was carried out after the airtightness test, and no expansion compensation bends were used during installation