scope:

This Standard specifies steel pipe flanges (hereafter referred to as "flanges") of nominal sizes 10 A to 1 500 A for nominal pressures 5 K, 10K, 10K light type, 16K, 20K, 30K, 40K and 63K which are used to join parts for piping, such as steel pipes and valves used for ordinary piping ¹⁾, pressure piping ²⁾, high pressure piping ³⁾, high temperature piping ⁴⁾, alloy steel piping ⁵⁾ and stainless steel piping ⁶⁾ for steam, air, gas, water, oil, etc.

This Standard is also applicable to flanges which are integral with the piping part, and constituting a part thereof (hereafter referred to as the "integral flanges").

NOTE 1: The outside diameters of JIS steel pipes are shown in Annex B.

NOTE 2: All the pressure values indicated in this Standard are of the gauge pressure.

Notes ¹⁾ Piping using carbon steel pipes for ordinary piping of JIS G 3452 and arc welded carbon steel pipes of JIS G 3457.

²⁾ Piping using carbon steel pipes for pressure service of JIS G 3454.

³⁾ Piping using carbon steel pipes for high pressure service of JIS G 3455.

⁴⁾ Piping using carbon steel pipes for high temperature service of JIS G 3456.

⁵⁾ Piping using alloy steel pipes of JIS G 3458.

⁶⁾ Piping using stainless steel pipes of JIS G 3459 and large diameter welded stainless steel pipes of JIS G 3468.