Is it necessary to insulate the pressure tap tube when measuring high-temperature gases?
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Is it necessary to insulate the pressure tap tube when measuring high-temperature gases? For example, when measuring pressure in high-temperature air at temperatures above 600°C, the pressure tube is lengthened to a certain extent in order to reduce the temperature and thus protect the pressure gauge. But the front end of the pressure tap should be very hot, right? Does this section need to be wrapped with insulation material? If it is covered, it will definitely affect the heat dissipation of the pressure guiding tube, which goes against our original intention. I wonder how people handle this situation in engineering?
What you are measuring is air pressure; as long as the medium inside the pressure transduction tube can transmit pressure, insulation is not necessary
In the event of a safety accident that results in someone getting burned, the responsibility falls on the designers. But honestly, I don’t plan to insulate it either; just putting up some warning signs will do
Aren’t there enough warning signs? We use something similar to a fence to separate things
A heat-dissipating, heat-resistant protective sleeve is added to the outside of the pressure tap pipe; this sleeve has a diameter of around 50 mm, and its wall is equipped with numerous cooling holes whose diameter is slightly smaller than that of a little finger.
What is the lowest temperature throughout the year? The anti-freezing issue after the medium condenses must be considered.
Measure pressure at 600 degrees Celsius? What kind of pressure gauge is this, so resistant to high temperatures?
If heat dissipation is required, a heat-proof design should be implemented, such as a shielding enclosure.
External insulation is not necessary, but it is advisable to install simple protective measures around it and hang warning signs.
This approach is quite right; we considered it before as well. The issue was that we couldn’t find ready-made components for this sleeve, so in the end we gave up on it and simply used warning signs instead
It will not freeze up while in operation. When it is not in use, and the ambient temperature is low, no condensation water will form in the pressure transducer tube, thus preventing freezing; therefore, insulation for this pressure transducer tube is not necessary.