Applications

Slip on Flanges according to JIS B2220 – 30K standard are commonly used in the following industries:

Oil and Gas Industry: Used in oil, gas and chemical transmission systems.

Chemical industry: Connecting high pressure chemical piping systems.

Energy industry: Used in power plants, heating and cooling systems.

Shipbuilding industry: Used in piping systems on ships.

Water supply and drainage industry: Used in water supply and wastewater treatment systems.

Standards

JIS B2220 is a Japanese standard that specifies flanges for piping systems. Here are some key points in this standard:

Size: Various, from DN10 to DN2000 (depending on request)

Surface: Can be coated with anti-corrosion coating such as galvanized, epoxy paint

Working pressure: Specifies the maximum pressure the flange can withstand (30K equivalent to 30 kg/cm²).

Materials: Specifies suitable materials for flanges, including carbon steel, stainless steel and alloys.

Design and manufacturing: Regulations on design, manufacturing process and product quality control.

Installation and maintenance: Instructions for proper installation and maintenance measures to ensure durability and safety in use.

Size (inches)	Outer diameter (OD) (mm)	Inside diameter (ID) (mm)	Bolt hole diameter (BC) (mm)	Number of bolt holes	Bolt hole diameter (mm)	Flange thickness (T) (mm)
1/2	95	15	60.5	4	15	20
3/4	105	20	70	4	15	22
1	115	25	75	4	19	24
1 1/4	135	32	90	4	19	26
1 1/2	140	38	95	4	19	28
2	160	50	120	8	19	30
2 1/2	185	62	135	8	23	32
3	210	75	150	8	23	34
4	255	100	190	8	23	38
5	280	125	215	8	23	42
6	320	150	260	12	23	46
8	380	200	320	12	25	50
10	445	250	385	16	25	54
12	510	300	450	16	25	58
14	540	350	485	20	25	60
16	600	400	550	20	27	64
18	670	450	620	24	27	68
20	730	500	680	24	27	72
24	845	600	790	24	30	80

Note:

OD (Outside Diameter): Outside diameter of the flange.
ID (Inside Diameter): Inside diameter of the flange.
BC (Bolt Circle Diameter): Diameter of the bolt hole circle.
T (Thickness): Flange thickness.

Summary table of commonly used materials for JIS B2220 – 30K Slip on Flanges

Material Type	Symbol	Main ingredient	Main application
Carbon steel	SS400	C, Mn, Si, P, S	Oil, gas, water pipes, HVAC systems
Stainless Steel	SUS304	Fe, Cr (18-20%), Ni (8-10.5%)	Food, chemical, medical industry
Stainless Steel	SUS316	Fe, Cr (16-18%), Ni (10-14%), Mo	Highly corrosive, chemical, marine environments
Low alloy steel	A105	C, Mn, Si, P, S	High pressure pipeline, oil and gas, power plant
Heat resistant stainless steel	SUS310S	Fe, Cr (24-26%), Ni (19-22%)	High temperature environment, boiler, thermal power plant
Duplex Steel	S31803	Fe, Cr (21-23%), Ni (4.5-6.5%), Mo (2.5-3.5%)	Chemical environment, sea water, oil and gas industry
Super alloy stainless steel	S32750	Fe, Cr (24-26%), Ni (6-8%), Mo (3-4%)	Extremely corrosive environments, oil and gas, chemical industries

Note:

SS400: Standard carbon steel with high tensile strength, commonly used in basic applications.
SUS304: Stainless steel with high chromium and nickel content, has good corrosion resistance in normal environment.
SUS316: Stainless steel with added molybdenum, providing higher corrosion resistance, especially in chemical and marine environments.
A105: Low alloy carbon steel, used in high pressure applications.
SUS310S: Heat-resistant stainless steel, commonly used in high temperature environments.
S31803: Duplex steel has high strength and good corrosion resistance in harsh environments.
S32750: Super alloy stainless steel with extremely strong corrosion resistance, often used in particularly harsh applications.

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JIS B2220 30K Slip on Flanges

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