8. BS flange standard

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Plate Flanges (Code 101) – BS 4504

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Description

Plate Flanges (Code 101) – BS 4504 are flat flanges manufactured to BS 4504. They are made from steel or stainless steel plates, circular in shape with a circular hole in the middle for attachment to pipes or other equipment.

Applications

Piping systems : Used to connect pipe sections together or to other equipment such as valves, pumps, and tanks.
Oil and Gas Industry : Used in oil and gas pipeline systems.
Chemical Industry : Used in chemical and liquid transport systems.
Energy industry : Applications in thermal, hydroelectric and nuclear power plants.
Water supply and drainage system : Used in water supply and wastewater treatment systems.

Standards

BS 4504 is a British standard that specifies flanges for pipework and other equipment. It covers:

Dimensions : Specifies the nominal size of the flange, outside diameter, inside diameter, number and size of bolt holes.
Material : Specifies the type of material used for the flange such as carbon steel, stainless steel, and other alloys.
Pressure and temperature : Regulations on the pressure and temperature resistance of the flange.
Manufacturing method : Regulations on methods of machining and manufacturing flanges.

BS 4504 ensures that flanges manufactured to this standard are of high quality and suitable for industrial applications.

Plate Flanges (Code 101) Dimensions and Thickness Table – BS 4504

Nominal size (inches)	Outer diameter (OD) (mm)	Center hole diameter (ID) (mm)	Bolt circle diameter (PCD) (mm)	Number of bolts	Bolt hole diameter (mm)	Flange thickness (mm)
1/2	90	15	60	4	14	11
3/4	100	20	70	4	14	11
1	110	25	80	4	14	12
1 1/4	115	32	90	4	14	13
1 1/2	125	40	100	4	14	13
2	150	50	120	4	14	14
2 1/2	180	65	140	4	18	14
3	190	80	150	4	18	16
4	230	100	190	8	18	16
5	255	125	215	8	18	18
6	280	150	240	8	18	18
8	345	200	295	8	18	20
10	405	250	355	12	18	22
12	485	300	425	12	18	24
14	535	350	475	12	22	24
16	595	400	535	16	22	26
18	635	450	585	16	22	26
20	700	500	650	20	22	28
24	815	600	770	20	22	30

Note:

Nominal size (inches) : Nominal size of pipe to flange connection.
Outside diameter (OD) : Outside diameter of the flange.
Center Bore Diameter (ID) : The center bore diameter of the flange.
Bolt Circle Diameter (PCD) : The circular diameter of the bolt holes.
Number of Bolts : Number of bolts required to connect the flange.
Bolt hole diameter : Diameter of the bolt holes.
Flange Thickness : The thickness of the flange.

Material Summary Table of Plate Flanges (Code 101) – BS 4504

Material code	Material	Material standards	Characteristic	Main application
CS	Carbon steel	ASTM A105, ASTM A36	High durability, easy to process, low cost	Water, oil, gas and chemical pipeline systems
SS304	Stainless Steel 304	ASTM A182 F304	Good corrosion resistance, durable, good heat resistance	Food, chemical, medical industry
SS316	Stainless Steel 316	ASTM A182 F316	Higher corrosion resistance than SS304, acid and alkali resistant	Chemical, marine, medical industries
Alloy Steel	Alloy steel	ASTM A182 F11, F22, F91	High heat and pressure resistance, good durability	Energy industry, thermal power plant
Duplex SS	Duplex Stainless Steel	ASTM A182 F51, F53	Good corrosion resistance, high strength, good heat resistance	Oil, gas, chemical, marine industries
Copper	Copper	ASTM B62	Good electrical and thermal conductivity, corrosion resistance in humid environments	Electrical industry, electronic equipment manufacturing
Aluminum	Aluminum	ASTM B247	Light, good corrosion resistance, easy to process	Aviation, transportation, construction industry
Brass	Brass	ASTM B16	Good electrical and thermal conductivity, corrosion resistance, easy to process	Production of valves, mechanical parts, electronic equipment
PVC	Polyvinyl chloride	ASTM D1784	Lightweight, corrosion resistant, non-conductive, low cost	Plumbing, wastewater treatment, chemical pipelines
Titanium	Titanium	ASTM B381	Very high corrosion resistance, light weight, durable	Aviation, medical, chemical, marine industries

Note:

Material code : Identification symbol of the material.
Material : The type of material used to make the flange.
Material standards : Technical standards of materials.
Features : Outstanding features of the material.
Main Applications : Main industries and applications of flanges made from that material.