7. DIN flange standard

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DIN 2576 Slip-On Flanges

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Description

DIN 2576 Slip-On Flanges are flanges manufactured according to DIN 2576 standard. The main features of this type of flange include:

Material: Usually made from carbon steel, stainless steel, or other alloy.
Design: Slip-On Flanges are simple in design and are easily installed by simply sliding over the pipe and welding into place. The inside diameter of the flange is larger than the outside diameter of the pipe so that the pipe can slide in.
Size: Available in various sizes to suit different pipe types, complying with DIN 2576 standard.
Surface: Usually machined smooth to ensure tightness when mating with other flanges.

Applications

Slip-On Flanges DIN 2576 are widely used in many different industries due to their convenience and ease of installation. Some common applications include:

Oil and gas industry: Used in oil and gas pipeline systems.
Chemical industry: Used in chemical piping systems.
Food and pharmaceutical industry: Used in piping systems for water and other liquids.
Construction industry: Used in water supply and drainage systems and air conditioning.

Standards

DIN 2576 standard specifies the technical and dimensional requirements for Slip-On Flanges, including:

Nominal size (DN): From DN 10 to DN 600.
Nominal pressure (PN): PN 10.
Materials: Carbon steel, stainless steel, and other alloys.
Bolt hole size: Clearly specified for each nominal size.
Flange thickness and outside diameter: Specified to ensure pressure resistance and durability.

DIN 2576 Slip-On Flanges Dimensions and Thickness Table

Nominal size (DN)	Nominal size (inch)	Outer diameter (D)	Hole diameter (d)	Flange thickness (t)	Bolt diameter (k)	Number of bolt holes	Bolt diameter (d1)
DN 15	1/2	95	15.5	12	65	4	14
DN 20	3/4	105	20.5	14	75	4	14
DN 25	1	115	26.5	14	85	4	14
DN 32	1 1/4	140	32.5	16	100	4	18
DN 40	1 1/2	150	38.5	16	110	4	18
DN 50	2	165	50.5	18	125	4	18
DN 65	2 1/2	185	66.5	18	145	4	18
DN 80	3	200	82.5	20	160	8	18
DN 100	4	220	102.5	22	180	8	18
DN 125	5	250	127.5	22	210	8	18
DN 150	6	285	152.5	24	240	8	23
DN 200	8	340	202.5	24	295	8	23
DN 250	10	395	257.5	26	350	12	23
DN 300	12	445	307.5	26	400	12	23
DN 350	14	505	357.5	26	460	16	23
DN 400	16	565	407.5	28	515	16	27
DN 450	18	615	457.5	28	565	20	27
DN 500	20	670	507.5	30	620	20	27
DN 600	24	780	610.5	30	725	20	30

Note:

Nominal size (DN) : Nominal size of flange in metric system.
Nominal size (inch) : Nominal size of flange in inches.
Outside diameter (D) : Outside diameter of the flange.
Hole diameter (d) : Diameter of the center hole of the flange.
Flange thickness (t) : Flange thickness.
Bolt diameter (k) : Distance between bolt holes.
Number of bolt holes : Number of bolt holes on the flange.
Bolt diameter (d1) : Diameter of the bolt hole.

Summary table of materials commonly used to manufacture DIN 2576 Slip-On Flanges

Material Type	Description	Main Applications	Special Features
Carbon steel	High carbon steel, usually ASTM A105	Oil and gas pipeline systems and heavy industries	High load capacity, low cost
Stainless Steel	Steel containing at least 10.5% chromium, usually grades such as ASTM A182 F304, F316	Food, pharmaceutical, chemical industry	Good corrosion resistance, shiny surface
Alloy steel	Steel containing other alloying elements such as nickel, molybdenum, vanadium, usually ASTM A182 F11, F22	Oil and gas, chemical, high temperature applications	Good heat and corrosion resistance
Cast iron	Iron alloy with high carbon content, usually ASTM A126 Class B	Water system, wastewater treatment	High compressive strength, low cost
Aluminum	Lightweight metal, commonly used in non-corrosive environments	Light industry, gas pipeline system	Light weight, easy to process
Copper and Copper Alloys	Metals that have good electrical and thermal conductivity, usually ASTM B62	Water supply system, electrical equipment	Good corrosion resistance, easy to process
Plastic	Industrial plastics such as PVC, CPVC, PTFE	Chemical industry, water treatment, gas systems	Corrosion resistant, lightweight
Titanium	Lightweight, highly corrosion resistant metal, typically ASTM B381 F2	Aviation, medical, chemical industries	Very good corrosion resistance, light weight, high temperature resistance