8. BS flange standard

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Slip On Flanges (Code 112) – BS 4504

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Description

Slip On Flanges are a type of flange that is designed to slide over the end of a pipe and weld into place. They have a hole that is larger than the outside diameter of the pipe, allowing the pipe to fit inside. To secure the flange, it is welded on both the outside and inside of the pipe.

Applications

Piping systems : Widely used in piping systems in the petroleum, chemical, pharmaceutical, energy, and other industries.
Pipe and Equipment Connections : Commonly used to connect pipe sections to equipment such as valves, pumps, and other types of process equipment.
Pressure systems : Suitable for high and low pressure systems.

Standards

BS 4504 is a British standard that specifies the technical and dimensional requirements for steel and steel alloy flanges. Here are some key points of this standard:

Dimensions and tolerances : BS 4504 provides detailed dimensional tables for various types of flanges, including bore sizes, outside diameters, and bolt holes.
Materials : The standard specifies suitable materials for flanges, including carbon steel, stainless steel, and other alloys.
Working pressure : Flanges according to BS 4504 standard are designed to withstand different working pressures, which are clearly specified in the standard.
Welding : Regulations on welding flanges to pipes, ensuring durability and safety during use.
Inspection and testing : The standard requires inspection and testing methods to ensure the quality and durability of flanges, including pressure testing, non-destructive testing, and dimensional inspection.

Slip On Flanges Dimensions and Thickness Chart as per BS 4504

Nominal Pipe Size (NPS)	Outside Diameter (OD)	Flange Thickness (T)	Diameter of Bolt Circle (D)	Number of Bolts (n)	Diameter of Bolt Holes (d)
1/2 inch	90 mm	11.2 mm	60.3 mm	4	15.9 mm
3/4 inch	100 mm	11.2 mm	69.9 mm	4	15.9 mm
1 inch	110 mm	12.7 mm	79.4 mm	4	15.9 mm
1 1/4 inch	115 mm	14.3 mm	88.9 mm	4	15.9 mm
1 1/2 inch	125 mm	15.9 mm	98.4 mm	4	15.9 mm
2 inch	150 mm	17.5 mm	120.7 mm	4	19.0 mm
2 1/2 inch	180 mm	19.1 mm	139.7 mm	4	19.0 mm
3 inch	190 mm	20.6 mm	152.4 mm	4	19.0 mm
4 inch	230 mm	22.2 mm	190.5 mm	8	19.0 mm
5 inch	255 mm	23.8 mm	215.9 mm	8	22.2 mm
6 inch	280 mm	25.4 mm	241.3 mm	8	22.2 mm
8 inch	345 mm	28.6 mm	298.5 mm	8	22.2 mm
10 inch	405 mm	30.2 mm	362.0 mm	12	25.4 mm
12 inch	485 mm	31.8 mm	431.8 mm	12	25.4 mm
14 inch	535 mm	35.0 mm	476.3 mm	12	28.6 mm
16 inch	595 mm	36.5 mm	539.8 mm	16	28.6 mm
18 inch	635 mm	39.7 mm	577.9 mm	16	31.8 mm
20 inch	700 mm	42.9 mm	635.0 mm	20	31.8 mm
24 inch	815 mm	47.6 mm	749.3 mm	20	35.1 mm

Note:

Nominal Pipe Size (NPS) : Nominal size of pipe.
Outside Diameter (OD) : Outside diameter of the flange.
Flange Thickness (T) : Flange thickness.
Diameter of Bolt Circle (D) : Diameter of bolt circle.
Number of Bolts (n) : Number of bolts.
Diameter of Bolt Holes (d) : Diameter of bolt holes.

Summary table of common materials used for manufacturing Slip On Flanges according to BS 4504 standard

Material Code	Material Type	Material Characteristics	Application
A105	Carbon steel	High durability, easy to process, good bearing capacity	Oil, gas, chemical and water pipeline systems
A182 F304	Stainless Steel 304	Good corrosion resistance, durable, high temperature resistance	Chemical, food, pharmaceutical industry
A182 F316	Stainless Steel 316	Higher corrosion resistance than F304, high temperature resistance	Chemical, oil and gas, seawater treatment
A350 LF2	Low Carbon Steel	High strength at low temperature, good pressure resistance	Low temperature, gas, oil and gas applications
A694 F52	Alloy steel	High tensile strength, good pressure resistance	Oil and gas, mining, heavy industry
A182 F11	Cr-Mo Alloy Steel	High temperature and pressure resistance, durable	Energy industry, power plants
A182 F22	Cr-Mo Alloy Steel	High temperature and pressure resistance, durable	Energy industry, power plants
A516 Gr.70	Carbon steel	High durability, easy to weld, good bearing capacity	Oil, gas, chemical, boiler industry
A182 F51	Duplex Stainless Steel	High corrosion resistance, high durability	Oil and gas, chemical, water treatment industries

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