DIN Sanitary Fittings

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1. Overview of DIN 11850 Standard

The DIN 11850 standard primarily defines the dimensions, materials, connection methods, and application scope of sanitary stainless steel piping systems. It is widely used in systems where hygiene, safety, and ease of cleaning are essential, particularly in the food, beverage, and pharmaceutical industries.

• Dimension Requirements: The standard specifies the pipe outer diameter, wall thickness, and tolerance, ensuring accurate dimensions and compatibility of the piping system.
• Material Requirements: Pipes and fittings must be made of stainless steel, with common materials being 304 and 316L stainless steel, which provide excellent corrosion resistance and ease of cleaning.
• Surface Requirements: The surface of pipes and fittings should undergo polishing to reduce roughness, preventing bacterial growth. The typical requirement for surface roughness is Ra ≤ 0.8µm.

2. Common Sanitary DIN 11850 Fitting Types

The DIN 11850 standard covers various types of fittings used for different pipe connections and configurations. Common fitting types include:

1) Elbow

• Function: Changes the direction of the pipeline, with common angles of 45°, 90°, and 180°.
• Material: Stainless Steel 304, 316L.
• Application: Used in pipeline systems where the direction of the pipe needs to be altered, widely applied in the food, beverage, and pharmaceutical industries.

2) Tee

• Function: Divides or combines the pipeline, common types include equal diameter and reducing tees.
• Material: Stainless Steel 304, 316L.
• Application: Used to branch or merge pipelines, suitable for the transfer of liquids or gases.

3) Flange

• Function: Connects pipes to equipment or other pipelines, ensuring a secure seal.
• Material: Stainless Steel 304, 316L.
• Application: Commonly used in systems requiring periodic disassembly or cleaning, such as food and pharmaceutical industries.

4) Coupling

• Function: Connects two segments of pipe, facilitating quick disassembly.
• Material: Stainless Steel 304, 316L.
• Application: Used in situations where quick disconnection of pipes is needed.

5) Union

• Function: Facilitates disassembly and reassembly of pipelines.
• Material: Stainless Steel 304, 316L.
• Application: Used in piping systems that require regular disassembly for cleaning.

6) Clamp

• Function: Fixes pipes to prevent vibration and displacement.
• Material: Stainless Steel 304, 316L.
• Application: Ensures the stability of the pipeline in installation processes.

7) Valve

• Function: Controls the flow of fluids, such as ball valves, butterfly valves, etc.
• Material: Stainless Steel 304, 316L.
• Application: Used to control the flow of liquids or gases in pipeline systems.

3. Sanitary Fitting Materials

Sanitary DIN 11850 fittings are generally made of the following two stainless steel materials:

• 304 Stainless Steel: Commonly used in general food, beverage, and chemical piping systems. It offers good corrosion resistance and oxidation resistance, suitable for most sanitary applications.
• 316L Stainless Steel: Contains molybdenum, which gives it enhanced resistance to chloride corrosion, making it suitable for harsher environments, such as the pharmaceutical industry or environments exposed to chlorides.

4. Surface Treatment Requirements

The surfaces of sanitary fittings and pipes must undergo special treatments to ensure there are no rough surfaces or pores that could lead to bacterial growth and contamination:

• Ra Value: The typical surface roughness (Ra) requirement is ≤0.8µm, and for higher-end applications, Ra ≤ 0.5µm may be required.
• Surface Treatments: Common treatments include electro-polishing and mechanical polishing.

5. Connection Methods

There are various connection methods for sanitary DIN 11850 piping systems, including:

• Clamp Connection: Uses a clamp to connect pipes, making disassembly easy. Suitable for sanitary piping systems.
• Welded Connection: Pipes are fixed together through welding, suitable for high-pressure or high-temperature systems.
• Threaded Connection: Uses threaded connections, typically for smaller diameter pipes.

6. Application Areas

Sanitary DIN 11850 fittings are widely used in the following areas:

• Food and Beverage Industry: Used for the transfer and distribution of liquids and gases.
• Pharmaceutical Industry: Used in pharmaceutical production and packaging processes to ensure products are not contaminated.
• Chemical Industry: Used for the transport and storage of chemicals.
• Biopharmaceutical and Laboratory: Used for high-demand fluid transfer and handling.