I would like to ask about methods for cooling high-temperature media
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When using a differential pressure flow meter equipped with a differential pressure transmitter to measure the flow rate of high-temperature media, a common problem arises: the temperature of the medium is too high, and the transmitter cannot handle it, so measures to lower the temperature need to be considered. Simply put, high-temperature steam together with a condensation tank is sufficient. So the question is, what happens when the medium is a high-temperature liquid or a high-temperature gas?
Use a transmitter equipped with a capillary; for the silicone oil, opt for a high-temperature resistant variety (although it can only withstand temperatures around 300 degrees – higher temperatures are not feasible as the silicone oil will vaporize easily). Lead the oil to another location for measurement, and use flanges for the connections during this process.
This is a typical approach, but recently I encountered a project where the medium was washing oil, bottom oil from pre-distillation towers, etc. – materials free of impurities – with temperatures ranging from 105 to 330°C. The design firm specified the use of balanced flow meters along with differential pressure transmitters that did not include any remote transmission devices; it seems that the design firm didn’t take the temperature of the medium into account at all. I originally wanted to use an annular buffer tube after the pressure tap to serve as a liquid seal, but I guess it will work at 105°C; at 330°C it definitely won’t work. The flow meters have already started production, and what needs to be addressed now is how to carry out proper measurements using non-dual-flange transmitters
Isolation measures can be applied to the pressure guiding tubes that connect the differential pressure transmitter.
Is it necessary to use an isolation tank for temperatures above 100°C?
Just use a longer measurement tube; don’t listen to those suggestions about using capillaries.
Not all steam cases require it; just extend the piping and add an overnight tank
This post was last edited by 955559 on 2018-7-20 09:45. It contained advertisements, so it has been edited.
High-pressure resistant transmitters can be used; if the temperature is too high, an isolation device must be installed to prevent the medium from coming into direct contact with the diaphragm box, and the use of an isolation fluid should also be considered.
Pressure guiding tubes with differential pressure are quite acceptable. Capillaries need to be insulated when used at high temperatures, and they are not as durable as pressure guiding tubes. If the temperature isn’t extremely high, you can simply use a condensation elbow; to reduce maintenance costs, many of us do this
Both liquids and high-temperature gases can be handled using a condensation tank; water can be filled into it before putting it into operation, and it should be filled completely before use