Seek advice on sourcing analysis instruments
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I would like to ask for advice regarding sampling issues with analytical instruments: Can the same sampling point be used for sampling in online analytical instruments as that used for laboratory analysis? If it is not allowed, where is this specified? I have checked the HG-T 20516-2000 Standards for the Design of Automatic Analyzer Rooms and the SHT 3104-2013 Standards for the Installation and Design of Petrochemical Instruments, but neither of them mentions anything on this topic. I believe that it is not allowed to use the same sampling point, and I am seeking regulatory support for this view. Thank you
No relevant requirements are specified in the standards, but the sampling points for the analyzer and those for the laboratory are designed according to different specifications, so it is rare for them to be compatible. I have been installing dry instruments for many years without encountering any suitable situations, and I haven’t paid attention to this issue either.
It depends on the characteristics of the online analyzer. If it only serves for indication purposes, then sharing it with the sampling port in the laboratory poses little risk; however, if it has functions such as adjustment and interlock, there is still a risk associated with sharing it, so this should be avoided.
I don’t understand analysis, but for public sampling points, could there be an impact on the analyzer when taking samples for testing?
Sampling can be combined, but it is necessary to ensure that the pressure for preprocessing by the analysis instruments is sufficient. The syngas at the outlet of the gasification scrubber tower in our company is sampled, then cooled and depressurized to be divided into two streams: one stream is further processed for use with on-line analysis instruments, while the other stream is reserved for sampling by the laboratory.
The sampling point for the analysis instruments is determined based on the opening drawings provided by the piping department; this is very important in order to prevent excessive moisture in the fluid from entering the upstream preprocessor and causing interference with the measurements. As in chromatography, prolonged exposure to water can damage the chromatography column, preventing accurate measurements.