Is it appropriate to install a positive-pressure rupture disc on negative-pressure equipment?
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The operating pressure of the negative-pressure device is -80 kPa, with a rupture disc set at 300 kPa for positive pressure. Is such a setting reasonable? What is the basis?
I think it’s unreasonable. The burst pressure of a rupture disc under a positive pressure of 300 kPa is indeed a positive pressure value; whereas the safety device in negative-pressure equipment is designed to activate at a certain level of negative pressure.
I don’t think it’s possible; the operating principles of positive-pressure rupture disks and negative-pressure rupture disks should be different
Of course not. A burst disc designed for low-pressure conditions should be used; the positive pressure is too high. The positive pressure in the original post is 300 KPa
It definitely won’t work; it’s necessary to choose based on the actual operating conditions
I need to know about the materials, temperature, etc., as well as the reaction mechanism of the materials in order to provide an answer.
Installing a rupture disc with a pressure rating of 300 kPa on this device is fine, as long as it can withstand a negative pressure of -80 kPa during normal operation without being drawn into the device; theoretically, there is nothing wrong with that. There are many ways to ensure the safety of positive and negative pressures in equipment, and there are also rupture discs designed as part of a system that can provide protection against both positive and negative pressures simultaneously. If you want to know more, you need to provide the various parameters of the equipment and processes. If you can consider using a breather valve or a safety valve, that would also be a good choice.
Definitely not; we used 1.6 MPa dome-shaped blast discs here before, and they deformed even when negative pressure was applied!
Your question is easy to answer; you can use a two-way rupture disc. The negative pressure is set at -80 ka. The positive pressure can be designed based on the pressure tolerance of your device. For example, if your device can withstand a positive pressure of 300 kPa. You can then choose a vacuum-80ka blast; a rupture disc capable of withstanding around 200 kPa of positive pressure will suffice. Two-way rupture discs are currently rare both domestically and internationally, but they do exist. If needed, please contact me!