Large-diameter 8-shaped blind flange
Thread Content
May I ask, are there any standard codes that can be referred to for the 8-shaped blind flanges in the European standard flange series, such as those with DN700 size?
It seems there are none available for DN500 and above; it can be replaced with a plug-in plate.
That is, using an insertion wrench – are there any reference standards for DN700 and above?
For petrochemical applications, there is no 8-character code for DN350 and above
Up to DN600; for larger sizes, drawings are required
For anything that exceeds the standards, it is necessary to turn to a design institute to create the designs.
May I ask, do design institutes generally have their own set of standards, namely standards for the dimensions of large-diameter plug plates, which they use as their drawing specifications?
Reply to 5# geng1013: Then how did the design institute calculate it? What kinds of references and materials are generally used?
HG21547-93: Gland plate, 8-character blind flange; maximum diameter of D600. For larger diameters, specialized mechanical design is required. However, at such a large size, an 8-character blind flange is not used – instead, a gland plate is employed.
If the size exceeds a certain limit, 8-character blind plates cannot be used, as they are not capable of bearing such heavy weights and are prone to breaking, posing a safety risk.
Reply to 8# Zhongnong: For sizes larger than DN600, gaskets and shims are required; it’s not possible to calculate the wall thickness precisely, so one can refer to the thickness of flange covers with the same pressure rating. For reference only