6. JIS flange standard

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JIS B2220 20K Flanges

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Description

JIS B2220 20K Flanges are flanges designed and manufactured according to JIS (Japanese Industrial Standards) B2220 with a nominal pressure of 20K (equivalent to 20 kg/cm² or about 285 psi). These types of flanges are often used in industrial piping systems to connect pipe sections together, connect pipes to equipment or to seal pipe ends.

Applications

JIS B2220 – 20K Flanges are widely used in many industries, including:

Oil and gas industry: Used in oil and gas pipeline systems, refineries.
Chemical industry: Used in chemical pipeline systems, chemical production and processing plants.
Water industry: Used in water supply and wastewater treatment systems.
Energy industry: Used in thermal power plants, hydroelectric power plants and renewable energy.
Shipbuilding Industry: Used in piping systems on ships.

Standards

JIS B2220 – 20K standard specifies the technical requirements for dimensions, materials, pressure, manufacturing methods and testing of flanges. Here are some key points in this standard:

Dimensions and tolerances: The standard specifies the nominal dimensions of the flange, including inside diameter, outside diameter, thickness, number of bolt holes and bolt hole diameter.
Materials: Common materials used to manufacture flanges include carbon steel, stainless steel, steel alloys, copper, aluminum, and other alloys.
Pressure and Temperature: The standard specifies the nominal pressure rating and operating temperature range that the flange can withstand.
Manufacturing methods: Including machining, welding, heat treatment and non-destructive testing processes.
Inspection and testing: The standard specifies the testing methods required to ensure the quality and durability of flanges, including pressure testing, dimensional inspection, material testing and non-destructive testing.

JIS B2220 – 20K Flanges Dimensions and Thickness Table

Nominal size (Inches)	Outer diameter (OD) (mm)	Inside diameter (ID) (mm)	Flange thickness (T) (mm)	Number of bolt holes	Bolt hole diameter (mm)	Washer diameter (BCD) (mm)
1/2	95	15	18	4	15	70
3/4	105	20	20	4	15	75
1	120	25	22	4	19	90
1 1/4	135	32	22	4	19	100
1 1/2	140	38	24	4	19	110
2	160	50	26	4	19	125
2 1/2	185	62	28	4	23	145
3	210	75	30	4	23	160
4	250	100	32	8	23	195
5	280	125	34	8	23	225
6	320	150	36	12	23	265
8	380	200	40	12	25	320
10	445	250	44	16	25	385
12	510	300	46	16	25	450
14	570	350	50	20	25	510
16	620	400	52	20	27	560
18	675	450	56	24	27	620
20	735	500	60	24	27	670
24	850	600	66	28	30	780

Material Summary Table of JIS B2220 – 20K Flanges

Material Type	Material code	Describe
Carbon steel	SS400, S20C, S25C	Plain carbon steel, easy to process and weld, low cost.
Low alloy steel	S35C, S45C	Carbon steel has higher carbon content, high strength, used for high load bearing applications.
Stainless Steel	SUS304, SUS316, SUS304L, SUS316L	Stainless steel has high corrosion resistance, suitable for harsh environments and applications in the chemical and food industries.
Alloy steel	SCM435, SCM440	Alloy steel has high strength, good heat resistance and wear resistance.
Copper	C3771, C3604	Copper and copper alloys have good electrical and thermal conductivity and good corrosion resistance.
Aluminum	1050, 5052, 6061	Aluminum and aluminum alloys are lightweight, corrosion resistant, and easy to process.
Cast iron	FC200, FCD450	Cast iron has good casting ability, low cost, used in applications that do not require high durability.
Nickel alloy	Inconel 600, Inconel 625	Nickel alloys have high heat resistance, corrosion resistance and pressure resistance.