What is the difference between weld neck flanges and slip-on flanges?
1: The core difference between weld neck flanges and slip-on flanges lies in the welding method, pressure bearing capacity, and applicable scenarios: weld neck flanges use double-sided circumferential welds, which are suitable for high-pressure and high-temperature systems; slip-on flanges are single-sided fillet welds, mainly used in low-pressure environments.
2: Different styles and sizes
sealing surface of weld neck flanges sealing surface of slip-on flanges
Main differences
Welding method and structure.
slip-on flanges: The pipeline is directly inserted into the flange groove and welded with a single-sided fillet weld, which cannot be designed with a flange neck.
weld neck flanges: with a long neck, the pipeline is connected to the flange end face, double-sided circumferential welding is used, and the structure is more complex.
Performance and applicability.
Pressure bearing capacity: slip-on flanges are suitable for medium and low pressure systems with PN ≤ 2.5MPa; The weld neck flanges can withstand high pressure above PN2.5MPa.
Sealing: Double sided welding of weld neck flanges provides better sealing and resistance to high temperatures and pressures; Single side welding of slip-on flanges is prone to leakage.
Application scenario: slip-on flanges are used in low-pressure fields such as construction and water supply and drainage; weld neck flanges are used in high-pressure and high-temperature environments such as petrochemicals and electricity.
Cost and installation.
slip-on flanges are made of simple materials (such as carbon steel plates), with low cost and easy installation.
weld neck flanges often use forged steel, which is costly, requires professional welding, and is complex to install.
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