Introduction to Japan Application Standard System JIS

03.22.2024

◆Pipe: Large outer diameter series (JIS G3454, JIS G3458, JIS G 3459) Most of the same as ANSI

Nominal diameter of seamless steel pipe: (DN6~DN650)mm

Wall thickness expression method: The pipe number “Sch” indicates wall thickness

Carbon steel and alloy steel JIS G3454, JIS G3458:

Sch10, Sch20, Sch30, Sch40, Sch60, Sch80, Sch100, Sch120, Sch140, Sch160 10 levels;

Stainless steel JIS G 3459: 7 grades: Sch5s, Sch10s, Sch20s, Sch40s, Sch80s, Sch120s, Sch160s;

Nominal diameter of welded steel pipe: (DN350~DN2000)mm

Wall thickness expression method: directly expressed by wall thickness numerical value.

◆Pipe flange: (JIS B2201, JIS B2220, etc.) has its system and is neither an “American flange” nor a “European flange”

Nominal diameter: (DN10~DN1000)mm

Nominal pressure levels: 2K, 5K, 10K, 16K, 20K, 30K, 40K, 63K, 8 levels in total

Flange sealing surface: 5 types: smooth surface, large convex surface, small convex surface, concave and convex surface, tongue and groove surface

Flange types: 6 types: flat welding type, socket welding type, butt welding type, threaded connection type, loose sleeve type and flange cover

The JIS application standard system cannot be used with ANSI and DIN. To make up for this shortcoming, the Japan Petroleum Institute compiled a set of JPI standards, which are basically equivalent to the ANSI/API application standard system so that it can be interchanged with ANSI.