Carbon Steel Lap Joint Flange

Approx Price:

Category: Carbon Steel Flanges, Flanges, Lap Joint Flange

Size: 1/2″ (15 NB) to 48″ (1200NB)
Standards: ANSI B16.5, ANSI B16.47 Series A & B, MSS SP44, ASA, API-605, AWWA, Custom Drawings
Class/Pressure: 150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc.
Flange Face Type: Flat Face (FF), Raised Face (RF), Ring Type Joint (RTJ)
Pressure Ratings: 285 psi, 740 psi, 1480 psi, 3700 psi
Temperature Range: -20°F to 400°F, -20°F to 750°F, -20°F to 750°F, -20°F to 1000°F

A Carbon Steel Lap Joint Flange is a two-piece flange assembly consisting of a stub end and a backing flange. It is primarily used in piping systems that require frequent dismantling for inspection, maintenance, or cleaning. This flange type is ideal for applications where alignment and bolt hole rotation are important.

Material Composition:

Flange Material: Carbon Steel (ASTM A105, ASTM A350 LF2, ASTM A694, etc.)
Stub End Material: Stainless Steel, Alloy Steel, or Carbon Steel
Coating Options: Black Paint, Anti-Rust Oil, Zinc Plating, Hot-Dip Galvanized

Design Features:

The lap joint flange has a loose connection with the pipe, making it easy to rotate and align the bolt holes.
The stub end is welded to the pipe, while the flange itself remains unattached, allowing it to move freely.
Suitable for low-pressure applications and systems with frequent assembly/disassembly requirements.
Compatible with butt-weld stub ends, ensuring smooth flow inside the pipeline.
Available with raised face (RF) or flat face (FF) configurations.

Pressure Ratings:

Class 150, 300, 400, 600, 900, 1500, 2500
PN 6, 10, 16, 25, 40, 64

Sizes Available:

Inches: ½” to 48”
Metric: DN15 to DN1200

Applications:

Oil & Gas Pipelines
Petrochemical & Chemical Industries
Power Plants & Energy Sector
Water Treatment & Desalination Plants
Pharmaceutical & Food Processing Industries

Advantages:

Easy Alignment: Allows rotation of the flange for proper bolt hole alignment.
Cost-Effective: Ideal for large-diameter and low-pressure applications.
Versatile Material Selection: Compatible with various stub end materials.
Ease of Maintenance: Quick removal and replacement without disturbing the pipe system.