KS B 1511-87, JIS B 2214-1967


ич The facing of flanges follow JIS B2202. However, large flat back faces marked by
    broken lines can be used if necessary
иш The size of t in the diagram is decided based on the pipe attachment method.
    Steel welding pipe flanges follow JIS B2224

The relationship between fluid condition and maximum pressure

Follow JIS B 2201

Flange material
Steel ... ... ... SC42, SS41, SF40, S20C         Malleable cast iron ... ... ... BMC 28         Cast iron ... ... ... GC 20

Bolt and nut material