7. DIN flange standard

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DIN 2543 Slip-On Flanges

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Description

DIN 2543 Slip-On Flanges are a type of flange designed to be slipped over the end of a pipe and then welded into place. The flange has a bore slightly larger than the pipe and is slipped into place before being welded on both the inside and outside to increase strength and reduce leakage.

Applications

Slip-On Flanges according to DIN 2543 are commonly used in industries such as:

Oil and Gas
Chemistry
Energy industry
Air and water system
Vending Machine

They are suitable for low to medium pressure and temperature applications where low maintenance and ease of installation are required.

Standards

DIN 2543 is a German standard that specifies the specifications for Slip-On Flanges. Key points include:

Size and Diameter :
- Outside diameter (OD)
- Inside diameter (ID)
- Bolt Circle Diameter (BCD)
- Bolt Hole Diameter
- Number and size of bolt holes
Materials : Carbon steel, stainless steel, alloy steel and other materials suitable for specific applications.
Nominal Pressure : These flanges are designed to withstand different nominal pressures, such as PN6, PN10, PN16, PN25, and PN40.
Construction and Design : Flange thickness. Machining details to ensure the flange fits and functions effectively in the piping system.
Manufacturing and inspection standards : Manufacturing and quality control procedures to ensure flanges meet the required quality standards.

DIN 2543 Slip-On Flanges Dimensions and Thickness Table

Size (Inches)	Outside diameter (OD)	Bolt hole diameter (BCD)	Number of bolt holes	Bolt hole size (mm)	Flange thickness (mm)	Welding thickness (mm)
1/2	90	60	4	11.5	11.5	2.5
3/4	100	70	4	11.5	13	2.5
1	110	80	4	11.5	14	2.5
1 1/4	115	90	4	11.5	15	2.5
1 1/2	140	105	4	14.5	16	3
2	150	120	4	14.5	18	3
2 1/2	180	140	4	14.5	20	3
3	200	160	4	18	22	3.5
4	220	180	8	18	24	3.5
5	250	210	8	18	26	4
6	270	230	8	18	28	4
8	325	280	8	18	30	4
10	380	335	12	22	32	4.5
12	440	395	12	22	34	4.5
14	475	420	12	22	36	5
16	520	460	16	22	38	5
18	580	515	16	22	40	5
20	580	550	20	26	42	5.5
24	685	650	20	26	44	6

Summary table of commonly used materials for DIN 2543 Slip-On Flanges

Material	Symbol	Main ingredient	Characteristic	Application
Carbon steel	ASTM A105	Carbon, Manganese	High durability, easy to process, low cost	Oil, gas, water pipelines
Stainless Steel	ASTM A182 F304/304L	Cr 18%, Ni 8%	Good corrosion resistance, high durability	Chemical, food, pharmaceutical industry
Stainless Steel	ASTM A182 F316/316L	Cr 16-18%, Ni 10-14%, Mo 2-3%	High corrosion resistance in acidic environments	Chemical industry, marine
Alloy steel	ASTM A182 F11	Cr 1.25%, Mo 0.5%	High temperature and pressure resistance	Energy industry, boilers
Alloy steel	ASTM A182 F22	Cr 2.25%, Mo 1%	High temperature and pressure resistance, anti-corrosion	Oil and gas, chemical industry
Duplex Stainless Steel	ASTM A182 F51	Cr 22%, Ni 5%, Mo 3%	High corrosion resistance, good mechanical strength	Oil, gas, chemical, marine industry
Super Duplex Stainless Steel	ASTM A182 F53/F55	Cr 25%, Ni 7%, Mo 4%	Very high corrosion resistance, excellent mechanical strength	Oil, gas, chemical, marine industry