Can temperature and pressure transmitters for flammable and explosive media be connected by threading?
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Gentlemen: There is a flammable and explosive reaction vessel in which media such as styrene, xylene, butyl acrylate, and butyl acetate are poured in, followed by stirring to initiate the reaction. A temperature sensor is inserted into the top of this vessel – can it be connected using threads? Can pressure transmitters be connected via threads or in a direct connection?
When using temperature and pressure transmitters in reactors handling flammable and explosive media, threaded connections are acceptable, but special attention must be paid to sealing and safety. Threaded connections enable quick installation and removal, making them suitable for situations where devices do not need to be replaced frequently. However, since the media you mentioned are all highly flammable and explosive, it is recommended to use explosion-proof temperature and pressure transmitters, and to ensure that all connections meet the relevant safety standards. If conditions permit, using welding connections may be safer, especially in high-pressure or high-temperature environments. It is advisable to consult a professional or refer to relevant safety standards before installation. .
It’s not exactly a special medium, and the pressure is likely low as well; I think it should be fine. Let’s wait for an expert to provide a more comprehensive answer
The thermometer flange sleeve is installed; a flange capillary pressure transmitter is used for the transmitter. It’s unacceptable for the design institute not to design it this way.
While ensuring safety, accuracy, and stability, the pressure transmitter can be directly connected to the reactor via threaded connection. It should be noted, however, that additional safety measures must be taken during direct connection, such as using explosion-proof pressure transmitters and ensuring there are no leaks at the connection points.
Add a sleeve for temperature and a valve for pressure.
It’s understandable to choose a flanged pressure transmitter in cases where the medium is non-corrosive; but since the temperature isn’t a factor, why use a capillary tube?
Flange pressure transmitters are less likely to leak, while joint-type pressure transmitters are more prone to leakage
Yes, I understand what you mean by the French type. But why choose a capillary type? Couldn’t a direct-connected diaphragm pressure transducer be used instead?
Abroad, I’ve seen ABB products with directly mounted flanges for joint ventures; when it comes to capillary flanges, there are multiple brands to choose from
Rosemount and E+H both offer them; Yokogawa’s official website does not list them, but domestic contract manufacturers also provide them. Direct-mount types are becoming the trend, and most direct-mount versions come standard