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Types of Flanges

Flanges are used to connect pipes, valves, pumps, and other equipment to form a piping structure. It also provides easy access for cleaning, inspection, or modification. There are numerous types of flanges available. Let's discuss this in detail through this PPT.

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Types of Flanges

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  1. Types of Flanges

  2. Introduction • Flanges are used to connect pipes, valves, pumps, and other equipment to form a piping structure. It also provides easy access for cleaning, inspection, or modification. There are numerous types of flanges available, including:

  3. Flange Slip-On • The flange is slid over the pipe and welded at both the top and bottom. They are used to provide the connection with sufficient strength and to stop leakage. This flange is preferred over welded neck flanges because cutting the pipe to length requires less precision, the cost of production is lower, and the result is nearly identical.

  4. Flanges With Blinds • This is an un bored flange. It is commonly referred to as a blanking flange and can be used to fix or seal the end of the pipe frame or to shut off the pipe system or vessel opening. Inspection of vessels or pipe structures is now faster and easier. A blind flange can be supplied with or without a hub, depending on the requirements.

  5. Flanges For Lap-Joints • Lap-Joint Flanges are the same as slip-on flanges, except they have a radius at the intersection of the bore and the flange face to match the end of the lap stub. The face on the end of the stub forms the gasket face on the flange. This type of flange is commonly used in installations where pipe system components must be quickly and easily dismantled for inspection or replacement.

  6. Flanges For Socket Welding • The bore is recessed to accept the pipe, as opposed to the outline slip-on flange. The remaining bore’s diameter is the same as the shaft’s interior diameter. The flange is attached to the pipe by fillet welding around the flange’s hub. In high-stress applications, interval welding is an option. It’s most common in high-pressure structures like hydraulic and steam lines.

  7. Flanges With Threads • Threaded Flanges have the same outline as a slip-on flange, but the bore is threaded, making it easier to assemble without welding. This clearly limits its application to low-pressure pipe structures. The flange can be welded around the joint after assembly, but this is not thought to be a good way to expand its uses.

  8. Flanges With Weld-Neck • Weld-Neck Flanges, as the name implies, are joined by welding the flange’s neck to a pipe. It is expensive because of its long neck, but it is ideal for high tension applications because the neck provides vital reinforcement to the flange. The flange bore matches the shaft bore, reducing vibration and erosion.

  9. Unique Flanges • These are some examples: • Tongue and Groove Flanges • Flanges for orifices • Flanges for Spectacles

  10. Tongue and Groove Flanges The tongue flange is always coupled to the groove flange. The tongue flange has a raised ring on the face. One flange has a raised ring (also known as the tongue) and the other has a groove depression (also called the groove). These two flanges should be a perfect match. Tongue-and-groove surfaces come in both large and small sizes. They’re mostly used for valve covers and pump covers. Tongue-and-groove joints have the advantage of being self-aligned and acting as an adhesive reservoir. Because of the scarf joint, which holds the axis of loading in place, large machining operations are not required.

  11. Flanges For Orifices An orifice flange’s function is to provide access to a line for the metering of gases or liquids. An orifice plate is clamped between a pair of flanges when mounted in a line, and the entire assembly is referred to as an orifice flange union. The orifice plate is easily removed thanks to the jack-screws inside the assembly. The metering device, the orifice plate, is made up of a thin plate with a concentric square edge and a circular hole in the center. Two pressure tap holes are drilled in each flange to measure the pressure difference across the orifice.

  12. Flanges For Spectacles Spectacle flanges, also known as spectacle blind flanges, are more commonly found on piping structures that must be separated on a daily basis or when the flow through the systems is halted periodically. Source: https://theomnibuzz.com/types-of-flanges/

  13. Contact Us Fanatech Engineering & Trading LLC • Address: P O Box No. 128237, Dubai, U.A.E • Contact No: +971 4 8800313 • Email id: sales@fanatech-me.com

  14. Thank You

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