8. BS flange standard

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Threaded Flanges (Code 113) – BS 4504

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Description

Threaded flanges, also known as threaded flanges, are used to connect pipes to equipment or systems without welding. These types of flanges have internal threads that match the external threads of the pipe. Threaded flanges are made from a variety of materials such as stainless steel, carbon steel, and other alloys, depending on the specific application requirements.

Applications

Threaded flanges are commonly used in low pressure piping systems and in environments where welding is not feasible or unsafe. Common applications include:

Water supply system
Oil and gas processing system
Chemical treatment system
Pneumatic system
Heating and air conditioning systems

Standards

According to BS 4504 standard, the technical requirements of threaded flanges (Code 113) include:

Dimensions and tolerances : Specified to ensure conformance to standard pipe sizes.
Materials : Carbon steel, stainless steel, or other special materials listed in the standard to ensure durability and corrosion resistance.
Operating Pressure and Temperature : Designed to operate safely within the specified pressure and temperature range.
Threads : Thread standards must conform to other international standards to ensure compatibility.
Inspection and testing : Inspection methods such as pressure testing, non-destructive testing, and mechanical testing are specified to ensure product quality.

Threaded Flanges (Code 113) Dimensions and Thickness Table according to BS 4504

Size (inches)	Outer diameter (OD) (mm)	Thread hole diameter (mm)	Eye bolt diameter (mm)	Number of bolt holes	Bolt hole diameter (mm)	Body thickness (C) (mm)	Flange thickness (T) (mm)
1/2	89	15	60	4	11	11.2	14.3
3/4	98	20	70	4	11	12	15.9
1	108	25	79	4	11	13	17.5
1-1/4	117	32	89	4	11	14	18.1
1-1/2	127	40	98	4	11	15	19.1
2	152	50	120	4	11	16	20.7
2-1/2	178	65	140	4	14	18	23.1
3	190	80	152	4	14	20	24.1
4	229	100	190	8	14	24	25.6
5	254	125	216	8	14	26	28.6
6	279	150	241	8	18	28	30.2
8	343	200	298	8	18	30	33.3
10	406	250	362	12	18	32	36.3
12	483	300	432	12	18	36	39.3
14	533	350	476	12	22	38	42.3
16	597	400	540	16	22	40	45.3
18	635	450	578	16	22	42	48.3
20	698	500	635	20	22	44	51.3
24	813	600	749	20	26	48	55.6

Summary table of materials commonly used for manufacturing Threaded Flanges (Code 113) according to BS 4504 standard

Material Type	Material Grade	Characteristic	Application
Carbon steel	ASTM A105	Good bearing capacity, easy to process, reasonable price	Used in low to medium pressure piping systems
Stainless Steel	ASTM A182 F304/F316	High corrosion resistance, durable in harsh environments	Used in chemical, petroleum, food and pharmaceutical systems
Alloy steel	ASTM A182 F11, F22	High heat and pressure resistance	Used in steam, hot water, oil and compressed air systems
Cast iron	ASTM A126	Low cost, easy to process	Used in water supply and drainage systems
Copper	ASTM B62	Good corrosion resistance, good thermal and electrical conductivity	Used in sea water, chemical and compressed air systems
Nickel Alloy	ASTM B564 (Inconel 600, 625)	High heat resistance and corrosion resistance	Used in high temperature applications and highly corrosive environments
Titanium Alloy	ASTM B381	High corrosion resistance, lightweight and durable	Used in the aerospace, chemical, and petroleum industries