The medium toxicity poses a moderate level of hazard, and the pressure is less than 0.6 MPa; is it appropriate to use plate flanges for the pipe flanges?
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The medium toxicity poses a moderate level of hazard, and the pressure is less than 0.6 MPa; is it appropriate to use plate flanges for the pipe flanges?
There’s nothing inappropriate. It’s often used this way.
Other properties of the medium, such as permeability and oxidizing capacity, also need to be considered; generally speaking, I think it can be used
For most purchased pipe flanges, there is not much difference between those designed for a pressure of 0.6 Mpa and those designed for 1.0 Mpa; it is therefore more reliable to use pipe flanges rated for 1.0 Mpa, as this reduces the risk of leaks.
In addition to toxicity, determine whether the medium is explosive or flammable; if it is explosive or flammable, indicate the corresponding grade as well
If it is a process medium, a flat-faced weld flange at 1.6 MPa should be used.
Generally, wafer flanges with necks are still the most commonly used, as the welding quality is easier to ensure.
In such a case, I use plate-type butt weld flanges with a pressure rating of 1.0 MPa. If the medium is flammable and explosive, flanges with a neck design should be used at the very least; weld-on type flanges would be even better, in my opinion~~~
SH/T3074-2007 has relevant provisions
The medium toxicity poses a moderate level of hazard; plate flanges are generally used for pipe flanges, and PN1.0 is chosen to facilitate connection to external valves.
The design allows the use of different flanges, as long as the strength considerations are appropriate. As for corrosion resistance, etc., it has little to do with the type of flange and is related to the flange material. For flat flanges, when pipes are inserted and welded at both sides, the gap size should be minimized as much as possible; there are regulations regarding this. A gap of 2 mm is definitely acceptable, since such a gap can lead to fouling and subsequent corrosion. RFWN is of course better, as mentioned earlier – the welding quality is easier to ensure in the case of butt joint groove welding