What is the Stub End Classification and Function?

What is the Stub End Classification and Function?

Stub ends are used together with lap joint flanges to form detachable flange connections.

Classification

• Type A Stub End: Matches standard lap joint flange (most widely used)
• Type B Stub End: Matches slip-on flange used as backup flange
• Type C Stub End: Lightweight, thin-wall type for special service
• Long Pattern Stub End
• Short Pattern Stub End

Functions

• Used together with lap joint flange to form a detachable flange connection.
• The flange can rotate freely for easy bolt hole alignment during installation.
• Save cost for expensive alloy or stainless steel piping, only stub end uses premium material.
• Facilitate quick disassembly, inspection and maintenance of pipelines.
• Provide smooth inner bore, reduce turbulence and pressure loss of medium.
• Suitable for large-diameter pipelines and systems requiring frequent overhaul.