Loose sleeve flange and FF plate flange are two different types of flange connections. They have different characteristics and appearance. They can be distinguished in the following ways:
Flatness and concavity of flange surface:
Loose sleeve flange: The flange surface of a loose sleeve flange is usually flat, but there is a slightly raised dome in the center of the flange, which is often called a “sleeve” or “collar”. This sleeve is designed to accommodate the sealing gasket to ensure a tight seal. Therefore, the central part of the loose flange will protrude slightly.
FF plate welding flange: The flange surface of the FF flat welding flange is completely flat without a central raised sleeve. The flange surface has a flat appearance with no concavities or convexities.
Flange use:
Loose tube flanges are often used in high-pressure, high-temperature or high-precision applications because they provide additional sealing protection and can adapt to more demanding environmental conditions.
FF panel type flat welding flange is generally used in general industrial applications and does not require extremely high sealing performance.
Washer type:
Loose sleeve flanges usually require the use of sleeve gaskets or metal washers to accommodate the bulge in the center of the flange.
FF flat welding flanges usually use flat sealing gaskets because their flange surfaces are flat and do not require additional sleeves.
Appearance differences:
The appearance of the loose sleeve flange will have a small round hill in the center of the flange, while the appearance of the FF panel flat welding flange is completely flat.
By observing the shape and characteristics of the flange surface, and understanding its usage environment and requirements, you can distinguish between loose sleeve flanges and plate flat welding flanges with FF surfaces.
Post time: Oct-12-2023
