7. DIN flange standard

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DIN 2573 Slip-On Flanges

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Description

DIN 2573 Slip-On Flanges

Product Type: Slip-On Flange
Standard: DIN 2573
Material: Stainless steel, carbon steel, alloy, and other special materials
Size: Usually from DN 10 to DN 600
Working pressure: PN 6
Features: Slip-On flanges are manufactured with a sliding hole for easy installation on pipes. These flanges are commonly available in two forms: flat flanges and flanged flanges.

Applications

Industry: Oil and gas, chemical, energy, food and beverage, and other industries.
Function: Connect pipes together, connect pipes to equipment such as valves, pumps, or tanks. Slip-On Flanges are easy to install and can be adjusted in position before welding.

Standards

DIN 2573: This standard specifies the technical requirements for Slip-On Flanges with a working pressure of PN 6. It includes specifications for dimensions, tolerances, materials, and testing methods.

The main technical parameters in DIN 2573 standard include:

Nominal size (DN)
Nominal Pressure (PN)
Outside diameter (OD)
Center hole diameter
Flange thickness
Bolt ring diameter
Number and size of bolts
Dimensional tolerance

This standard is intended to ensure that flanges are manufactured to the correct dimensions and tolerances specified to ensure consistency and correct installation in industrial piping systems.

Size and thickness table of Slip-On Flanges according to DIN 2573 standard

Size (DN)	Outer diameter (OD) (mm)	Bolt circle diameter (PCD) (mm)	Hole Diameter (ID) (mm)	Flange thickness (T) (mm)	Number of bolts	Bolt size
1/2″ (15)	95	65	21.3	12	4	M12
3/4″ (20)	105	75	26.7	14	4	M12
1″ (25)	115	85	33.4	14	4	M12
1 1/4″ (32)	140	100	42.2	16	4	M12
1 1/2″ (40)	150	110	48.3	16	4	M12
2″ (50)	165	125	60.3	16	4	M12
2 1/2″ (65)	185	145	76.1	18	4	M12
3″ (80)	200	160	88.9	18	8	M12
4″ (100)	220	180	114.3	18	8	M12
5″ (125)	250	210	141.3	20	8	M16
6″ (150)	285	240	168.3	20	8	M16
8″ (200)	340	295	219.1	22	8	M16
10″ (250)	395	350	273	24	12	M16
12″ (300)	445	400	323.9	24	12	M20
14″ (350)	505	460	355.6	26	12	M20
16″ (400)	565	515	406.4	26	16	M20
18″ (450)	615	565	457	28	16	M20
20″ (500)	670	620	508	28	20	M20
24″ (600)	780	725	610	30	20	M24

Note:

DN size (Diameter Nominal): Nominal size of the flange.
Outside diameter (OD) : Outside diameter of the flange.
Bolt circle diameter (PCD) : Distance between bolt hole centers on flange.
Bore Diameter (ID) : Diameter of the flange center hole.
Flange thickness (T) : Flange thickness.
Number of bolts : Number of bolts required to install the flange.
Bolt Size : The size of the bolt used.

Summary table of commonly used materials for Slip-On flanges according to DIN 2573

Material Type	Material standards	Main application	Outstanding features
Carbon steel	ASTM A105	Used in oil, gas, chemical, and heavy industrial piping systems	Withstand high pressure and temperature, low cost
Stainless Steel	ASTM A182 (F304/F316)	Food, pharmaceutical, and highly corrosive environments industries	Good corrosion resistance, durable in harsh environments
Alloy steel	ASTM A182 (F11/F22)	Applications in thermal power, oil and gas, and chemical industries	Withstand high temperature and pressure, wear resistant
Duplex stainless steel	ASTM A182 (F51/F53)	Marine environments, oil and gas industry, and highly corrosive applications	Good corrosion and abrasion resistance, high mechanical strength
Super duplex stainless steel	ASTM A182 (F55)	Applications in harsh environments such as offshore oil and gas industry and chemical plants	Excellent corrosion resistance, high durability
Nickel alloy steel	ASTM B564 (Inconel 625/825)	Chemical, petroleum, and high temperature environments	Corrosion resistance and high temperature resistance, oxidation and sulfidation resistance
Copper-nickel alloy	ASTM B151 (C70600/C71500)	Marine industry and marine environment	Seawater corrosion resistance, high durability
Titanium stainless steel	ASTM B381 (Gr2/Gr5)	Aviation, maritime, and medical industries	Lightweight, high strength, excellent corrosion resistance
Aluminum alloy	ASTM B247 (6061)	Automotive, aerospace, and construction industries	Light, high strength, good corrosion resistance
Ferritic Stainless Steel	ASTM A182 (F430)	Applications in industries requiring high durability and corrosion resistance	High mechanical strength, good corrosion resistance