Lined and necked butt welded flange

Lined and Necked Butt Welded Flange

Product Overview:
The Lined and Necked Butt Welded Flange is a specialized flange designed for corrosion-resistant pipeline systems that handle aggressive or hazardous media. It combines a metallic necked butt weld flange with a non-metallic internal lining (typically PTFE, FEP, PFA, etc.), offering both structural strength and chemical resistance. The flange is welded to the pipeline while the lining ensures full sealing and protection from corrosion.

Key Features:

• Flange Material: Carbon steel, stainless steel, or alloy steel

• Lining Material: PTFE, FEP, PFA, PVDF, or customized lining

• Size Range: DN15–DN600 (1/2"–24") or customized

• Pressure Rating: PN10–PN25 / Class 150–Class 300

• Connection Type: Butt-welded with neck for smooth flow and stress relief

• Face Type: Raised face (RF) or flat face (FF), with lining extension to sealing surface

Advantages:

• Excellent chemical resistance for corrosive media

• Smooth flow transition minimizes pressure drop and turbulence

• Strong mechanical performance due to welded neck design

• Long service life in aggressive environments

• Lining effectively isolates fluid from metal, preventing corrosion and contamination

Applications:

• Chemical processing

• Acid and alkali transfer systems

• Pharmaceutical production

• Water treatment and desalination

• Food and beverage processing

• Semiconductor and cleanroom pipelines

Customization Options:

• Choice of lining material based on chemical compatibility

• Special dimensions or face finishes

• Drilling pattern and bolt hole customization

• Export packaging and marking upon request