Talking about flange water lines again
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This post was last edited by lim7717fly on 2020-4-22 at 11:31. Regarding the grooves on flanges, after reviewing several flange standards as well as discussions online, I believe that the presence of such grooves improves sealing performance; however, these grooves are formed naturally during the processing of the sealing surface through certain manufacturing methods, rather than being intentionally created. Please correct me. The several standard requirements are as follows: 1. HG/T20592-2009 \"Steel Pipe Flanges\", P15; 2. GB/T9112-2010 \"Steel Pipe Flanges\" – no requirements regarding water ripple lines were found; 3. NBT 47020~027-2012 \"Pressure Vessel Flanges\" – no requirements regarding water ripple lines were found; 4. SH/T 3406-2013 \"Steel Pipe Flanges for Petrochemical Industries\"; 5. ASME B16.5-2017; 6. JS B2220-2012. A post on the internet reads as follows:
Reference can be made to the annotations of the old 97 flange standard
Water ripple patterns are not necessary. In the past, flanges required such patterns, which were quite deep and could damage certain gaskets; therefore, in some cases it was specified that such patterns should be present. Today, the so-called water ripple patterns on flanges refer to a certain level of surface roughness in the sealing area, and there is no need to create additional water ripple patterns.
Based on the principle of gasket sealing, water patterns are not required
Some clients insist on using those old-fashioned water lines; there’s really nothing you can do about it.