Issues regarding the drainage of differential pressure transmitters and pressure transmitters
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Recently, I came across the installation diagrams for pressure transducers and differential pressure transducers as specified in the design standard HG/T 21581-2012. Some of these diagrams show no provision for drainage, while others do include such provisions. What is the reason for this? If the medium being measured is toxic or harmful, which approach should be followed for piping?
In my opinion, the installation of a drain valve is related to the medium used for measurement and the way it is installed; if the measurement medium or installation method could lead to blockages, then a drain valve should be installed. However, such valves are not necessary when dealing with toxic or harmful substances.
The discharge of toxic media should be incorporated into the system for sealed emissions within the process, especially for large-volume discharges, such as those from magnetic flap level gauges. As for whether to install a pressure-guiding pipe for drainage, it depends on the degree of \"dirtiness\" of the medium (referring to the properties of the process medium) as well as the practices followed in the plant; there is no standard answer. @jiaguoyun