Can two convex flanges be connected?
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I would like to ask fellow users: for two convex-faced (M) flanges with a design pressure of 1.66 Mpa, one being the flange on the equipment and the other on the pressure gauge, can they be connected directly? The connection dimensions are the same; I think it’s okay, but I have no experience using it.
This essentially amounts to using two RF-faced flanges in combination, although the sealing surface is narrower. We have built a device like this before; its body features an M-face flange, and users are required to use an M-face component as well for pairing. It’s just not clear whether in actual use it is also M-face to M-face.
Determine the appropriate use based on the application scenario; if it involves flammable and explosive substances, toxic substances, or substances under high temperature and pressure, it is not recommended to use it, while it can be considered in other cases
From personal experience, there aren’t many issues with bolt installation
Oh, the equipment flange is butt-welded, with a nominal pressure of PN25. I made a mistake; the flange on the equipment is of the M face type, while the pressure gauge is of the RF face type
The bolt connection dimensions are fine; the medium is cyclohexane/ethanol, which is a flammable and explosive substance. The operating temperature is 200 degrees Celsius, while the design temperature is 220 degrees Celsius.
It’s better to process it so that the bolts can be attached; it shouldn’t be used in this manner.
The flanges on the equipment all have M/FM (male/female) surfaces, while the flange on the differential pressure gauge has an RF surface; there is also a diaphragm box on that RF surface, which makes processing difficult. Since the equipment has already been manufactured, it’s not easy to make modifications on-site. Is there any other solution? Such as adapters. Additionally, for this operating condition, with a design pressure of 1.83 Mpa and a design temperature of 220°C, and given that the medium is flammable and explosive, can RF-faced flanges be used?