Specifications for the installation of instrument pressure tubes

For details, see HG/T 21581-2012 \"Automation Installation Atlas\"

I wonder whether the regulations specify explicitly whether a drain valve must be installed on the pressure guide tube used to measure the pressure or differential pressure of oxygen or vaporized oxygen

There is a claim that a drain valve should not be installed, as oxygen is present during drainage and this creates a fire risk. Is there such a statement?

The standard catalogs contain general guidelines; they indeed do not provide instructions for installing special types of media. Therefore, each specific case involving special media needs to be analyzed on its own. For example, in the case of oxygen or toxic and harmful gases, it is not allowed to discharge these substances, so simply avoid connecting any systems for discharge. We modify the installation diagrams for special media by altering the standard templates themselves

It generally cannot be discharged directly; a closed discharge system must be connected after the discharge valve

The installation manual is merely a template, so specific situations need to be analyzed on a case-by-case basis. Whether the medium is oxygen or oxygen vapor, there is no rule stating that it cannot be released. Additionally, the three elements necessary for a flame are a combustible material, an oxidizing agent, and a source of ignition; the oxygen you release is simply one of these oxidizing agents. Moreover, oxygen is already present in the atmosphere, and without the other two elements, combustion does not occur. Moreover, since it is only a leakage of wastewater here, and the amount is small. It should be fine, but I suggest you check with your engineering team to confirm whether there are any temperature issues with the steam oxygen. The design must comply with the requirements regarding steam emission, in order to prevent accidental injuries to operators and maintenance staff