6. JIS flange standard

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JIS B2220 16K Flanges

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Description

JIS B2220 16K Flanges are Japanese standard flanges, manufactured according to JIS B2220 standard with pressure rating 16K (16 kgf/cm² or 16 bar). These flanges are used to connect pipes, valves, pumps and other equipment in the pipeline system, helping to ensure safe and secure connections.

Applications

JIS B2220 – 16K flanges are widely used in various industries, including:

Oil and Gas Industry : Used in oil and gas pipeline systems, from oil and gas fields to refineries and distribution stations.
Chemical industry : Used in liquid and gas transmission systems in chemical plants.
Power Industry : Used in power plants, including nuclear power plants and coal-fired power plants.
Food and pharmaceutical industry : Used in food and pharmaceutical production and handling systems to ensure hygiene and safety.
Shipbuilding industry : Used in piping systems on ships and marine structures.

Standards

JIS B2220 standard specifies technical requirements for flanges, including the following parameters:

Nominal size : Flange size from DN10 to DN2000.
Nominal pressure : 16K (16 kgf/cm² or 16 bar).
Materials : Carbon steel, stainless steel, and other materials suitable for specific working conditions.
Dimensions and tolerances : Specified in detail for each type of flange, including outside diameter, inside diameter, thickness, number and diameter of bolt holes.
Inspection and testing : Requirements for quality inspection, pressure testing and other tests to ensure flanges meet technical standards.

JIS B2220 – 16K Flange Dimensions and Thickness Table

Nominal size (inches)	Outer diameter (mm)	Bolt hole diameter (mm)	Number of bolt holes	Bolt diameter (mm)	Flange thickness (mm)
1/2	95	15	4	15	16
3/4	105	19	4	19	18
1	120	19	4	19	20
1 1/4	130	19	4	19	21
1 1/2	140	23	4	23	22
2	160	23	8	23	24
2 1/2	185	23	8	23	26
3	210	23	8	23	28
4	250	23	8	23	30
5	280	25	8	25	32
6	320	25	12	25	34
8	380	25	12	25	36
10	445	29	16	29	38
12	510	29	16	29	40
14	570	32	16	32	42
16	620	35	16	35	44
18	675	35	20	35	46
20	730	38	20	38	48
24	850	41	24	41	50

Note:

Nominal Size (inches) : The nominal size of the pipe the flange will connect.
Outside diameter (mm) : Outside diameter of flange.
Bolt hole diameter (mm) : Diameter of holes for mounting bolts.
Number of bolt holes : Number of bolt holes on the flange.
Bolt diameter (mm) : Diameter of bolt used to connect flange.
Flange thickness (mm) : Flange thickness.

Create material summary table of JIS B2220 – 16K Flanges

Material	Describe	Main application
SS400	Medium tensile carbon steel	Pipeline for oil, gas, water, steam, and other fluids
SUS304	Austenitic stainless steel	Food, pharmaceutical, chemical industry
SUS316	Austenitic stainless steel with added molybdenum	Chemical industry, highly corrosive environments
A105	Carbon steel forgings for flanges and pipe parts	Applications in petroleum, chemical, and other industries
A182 F304	Forged Austenitic Stainless Steel	Chemical, petroleum, food industry
A182 F316	Forged austenitic stainless steel with added molybdenum	Highly corrosive environments, chemical industry
A350 LF2	Low temperature carbon steel	Application in low temperature conditions
A694 F52-F70	High strength carbon steel	High pressure, oil and gas applications
Duplex 2205	Duplex Stainless Steel	Applications in corrosive and high-pressure environments
Super Duplex 2507	Super Duplex Stainless Steel	Extremely corrosive environments, oil and gas, chemicals
Alloy 625	Nickel-Chromium-Molybdenum Alloy	Highly corrosive, high temperature environments
Alloy 825	Nickel-Iron-Chromium-Molybdenum-Copper Alloy	Highly corrosive environments, chemical industry
Titanium	Titanium Alloy	Applications in aviation, medical, chemical industries
Inconel 600/625	Nickel-Chromium Alloy	High temperature and corrosive environments

Note:

SS400 : Ordinary carbon steel, easy to process and low cost, suitable for applications that do not require high corrosion resistance.
SUS304 and SUS316 : Austenitic stainless steel with good corrosion resistance, in which SUS316 has added molybdenum to enhance corrosion resistance in acidic environments.
A105 and A182 : Forged steel grades, commonly used in high pressure and high temperature applications.
A350 LF2 : Special carbon steel for low temperature applications.
Duplex and Super Duplex : Stainless steel with a two-phase structure (ferritic and austenitic), providing high corrosion resistance and strength.
Alloy and Titanium : Special alloys, used in harsh conditions of corrosion and temperature.