Can the pressure ratings of the flanges at the equipment outlets be different?
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As the title says. If the design pressure of the equipment is 10 barg, can a flange on one of the pipe connections be 300#? Is there a standard specifying whether the flanges at the pipe ends must be the same or can differ? Thank you!
The flange class of the pipe ends can vary; there is no specification requiring them to be the same...
It must be possible, right? I have money – can’t I use a higher-grade one? Having money means being willful. (In fact, the actual situation is that we have high-grade flanges in stock.) I work in design, and in practice I’ve also encountered situations where clients requested that a certain flange be upgraded to a higher grade, which is no problem
The pound rating of the pipe flanges can vary; the pound rating of the instrument ports on many devices is relatively high, in order to ensure the reliability of the connections.
Generally, the flange class of small-diameter fittings (such as those used for instruments) is one grade higher than that of other fitting flanges.
Flanges of different pressure ratings also come in different sizes
I think that’s okay too, but be sure the mating flanges should also be of the same weight class.
It’s quite common; depending on the pipe end, there are flanges of various grades. I have also designed ones with a pipe end rating of 300 pounds and ones with a rating of 1500 pounds. . .
Flanges of different grades can be selected
Of course it can be different, but generally the pipe size is determined by the manufacturing process; however, the minimum nominal pressure must be suitable and must not be lower than the pressure of the equipment.