6. JIS flange standard

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JIS B2220 30K Weld Neck Flanges

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Description

Weld Neck Flange

Standard: JIS B2220 – 30K
Manufacturing materials: Carbon steel, stainless steel (Inox), copper alloy, aluminum, and other alloys depending on the requirements of the specific application.
Size: Nominal diameter (DN) from 10 mm to 600 mm or customized as required.
Working pressure: 30K (equivalent to 3000 psi pressure)
Structure: Has a long neck, easy to weld with pipes, helps reduce concentrated stress in the welding area, ensuring durability and good bearing capacity.

Applications

Oil and gas industry: Used in oil and gas pipeline systems, oil exploitation and processing equipment.
Chemical industry: Applied in chemical piping systems, chemical reaction and processing equipment.
Energy industry: Used in power plants, steam and cooling water piping systems.
Shipbuilding industry: Applied in ship piping system, cooling system and fuel supply.
Food and beverage industry: Used in food and beverage piping systems, manufacturing and processing systems.

Standards

JIS B2220 is a Japanese standard that specifies the dimensions, shapes, and technical requirements of flanges. This standard applies to weld-neck flanges with a nominal pressure of 30K, suitable for systems operating under high pressure.

Dimensions and Tolerances: Includes detailed tables of diameters, thicknesses, and tolerances for each flange size.
Materials: Clear regulations on the types of materials used, ensuring durability, mechanical properties and corrosion resistance.
Manufacturing process: Requirements for manufacturing, processing and quality control processes to ensure products meet standards.
Marking and testing: Regulations on product marking, pressure testing, non-destructive testing (NDT) and other testing requirements to ensure quality.

Size and thickness table of weld neck flange according to JIS B2220 – 30K standard

Size (inches)	Outer diameter (mm)	Inside diameter (mm)	Bolt diameter (mm)	Number of bolts	Bolt diameter (mm)	Thickness (mm)	Neck length (mm)
1/2	90	15	60	4	15	16	38
3/4	105	20	70	4	19	18	38
1	120	25	80	4	19	20	38
1 1/2	140	40	100	4	19	22	42
2	160	50	120	8	19	24	44
2 1/2	185	65	140	8	22	26	46
3	210	80	160	8	22	28	48
4	255	100	200	8	25	32	50
5	280	125	235	8	29	34	54
6	320	150	270	12	29	38	56
8	380	200	330	12	32	44	60
10	445	250	395	16	35	50	64
12	520	300	460	16	38	54	68
14	570	350	520	20	41	60	72
16	625	400	580	20	45	64	74
18	685	450	640	24	45	70	78
20	745	500	700	24	48	74	82
24	860	600	815	24	52	82	88

Summary table of common materials used for weld neck flanges according to JIS B2220 – 30K standard

Material Type	JIS Symbol	International Symbols	Main Applications
Carbon steel	S20C, S45C	ASTM A105	Used in high pressure oil, gas, chemical and water piping systems.
Stainless Steel	SUS304, SUS316	ASTM A182 (F304, F316)	Used in systems requiring high corrosion resistance such as food, pharmaceutical, and chemical industries.
Low alloy steel	SCM435	ASTM A350 (LF2)	Used in low temperature environments, such as liquefied natural gas (LNG) pipeline systems.
Nickel alloy	NCF600, NCF625	ASTM B564 (Inconel 600)	Used in highly corrosive and high temperature environments, such as petrochemical and nuclear power industries.
High alloy steel	SNC631	ASTM A182 (F11, F22)	Used in high temperature applications, such as boilers and heat treatment systems.
Brass and Copper	C3771, C2720	ASTM B62	Used in plumbing, air conditioning and steam systems.
Other special alloys	Hastelloy, Monel	ASTM B366 (Hastelloy)	Used in harsh, highly corrosive chemical environments.

Đánh dấu và kiểm tra: Các quy định về đánh dấu sản phẩm, kiểm tra áp suất, kiểm tra không phá hủy (NDT) và các yêu cầu kiểm tra khác để đảm bảo chất lượng.