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How to choose the right flange fastener?


Date:

2024-03-11

1. Flange type and size: Different types of flanges (such as flat welding, butt welding, socket welding, loose sleeve, threaded flanges and integral flanges) require different types of fasteners. The appropriate bolts, nuts and gaskets should be selected according to the specific size and type of flange.

Welcome to our website, our Sanshi industry is a professional manufacturer of flanged pipe fittings, the goods are exported overseas, you can produce national standards of flanged pipe fittings products if there is demand can contact us, below we will answer your questions:How to choose the right flange fastener?

Choosing the right flange fastener needs to consider the following key factors:

1. Flange type and size: Different types of flanges (such as flat welding, butt welding, socket welding, loose sleeve, threaded flanges and integral flanges) require different types of fasteners. The appropriate bolts, nuts and gaskets should be selected according to the specific size and type of flange.

2. Nominal pressure and operating temperature: The choice of material and type of fasteners mainly depends on the nominal pressure and operating temperature of the flange. Higher pressures and temperatures require the use of fasteners with higher strength, heat and pressure resistance.

3. Machining accuracy and length of bolts: machining accuracy and length of bolts should meet the working conditions. Under normal circumstances, the length of the bolt should be ensured that after tightening, the external size of the bolt protrusion nut is about 5mm, and the height of the thread is not less than 2 threads.

4. Material of bolts and nuts: When selecting the material of bolts and nuts, care should be taken to protect the bolts from nut damage. The general principle is that the hardness of the nut should be lower than that of the bolt (usually one hardness grade lower) to avoid the nut breaking the threads on the bolt.

5. The number and arrangement of bolts: Usually the number of flange bolts is a multiple of 4, in order to facilitate the use of symmetrical fastening methods. Reasonable bolt arrangement can ensure uniform distribution of pressure, improve the stability of the connection and sealing performance.

6. Gasket selection: gasket is an important sealing element in the flange connection, and its material, type and size should be selected according to the type of flange, working pressure and temperature.

In short, the selection of suitable flange fasteners requires comprehensive consideration of flange type, size, nominal pressure, working temperature, bolt and nut material grade, number and arrangement and other factors. At the same time, the corresponding flange technical standards and specifications should be selected to ensure the reliability, safety and sealing performance of the connection.

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Key Words:

Flange,flanges,flanges,pipe fittings