What is the difference between standard flanges and non-standard flanges?
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What is the difference between standard flanges and non-standard flanges? 1. National standard flanges are general-purpose components; the outer diameter, screw holes, and thickness of flanges of various specifications are fixed. Moreover, national standard flanges take safety factors into account, so the safety margins for their dimensions and thicknesses are relatively large. 2. Non-standard flanges are generally flanges designed by enterprises or individuals to save materials or to use locally available materials. Generally, non-standard flanges are designed to be smaller and thinner than standard flanges in order to save material; the design of the sealing surface can also be changed, for example by using O-rings for sealing. 3. Standard flanges are available on the market, while custom flanges must be designed and manufactured by oneself. 4. Standardized flanges have limited applications; for example, if the working pressure of a flange on a equipment cylinder is only 0.3 MPa, and you feel it’s not necessary to use a standardized flange with a pressure rating of 0.6 MPa, then you can design your own small, thin customized flange. However, you must ensure that the cost of designing and manufacturing it is less than the cost savings resulting from using less material.
In fact, the most direct difference is that standard components can be selected directly based on standards, whereas non-standard ones require manual calculation
Under normal circumstances, standard flanges used in various applications cannot be validated through strength calculations, as they are designed based on engineering experience... Whether to use standard parts or custom-made ones should be determined depending on the location where they will be used and the importance of that location; for example, standard flanges are typically used for ordinary pipe connections, while flanges used on equipment, especially those on heat exchanger manifolds, require strength calculations and are thus custom-made flanges
As for standard flanges saving material, it depends on the situation... Additionally, in terms of manufacturing, both standard and custom flanges are processed from raw materials; standard flanges purchased from outside generally are not in stock either, and production only begins after a contract is signed
Useful info – I finally manage to make a bit of a distinction between the two.
Custom non-standard flange CHEJ0211