Technical Specification

Parameter	Typical Details
Product	Lap Joint Flange
Assembly	Loose Flange + Stub End
Connection	Stub-end welded to pipe
Flange Material	Carbon Steel / Stainless Steel / Alloy Steel
Common Classes	150, 300, 600 and other applicable classes
Facing	Flat / Raised configuration as applicable
Dimensional Standard	ASME B16.5 / applicable specification
Size	As per piping requirement
Bolt Holes	Standard pattern for selected size/class
Bore	Compatible with corresponding stub end
Surface	Machined sealing area
Application	Detachable piping connections
Inspection	According to project requirements

Where This Flange Design Has an Edge

Lap Joint Flanges are particularly useful when piping sections need to be disconnected regularly. Since the flange itself is not permanently welded to the pipe, it can be rotated to align the bolt holes and can be reused when the stub end remains suitable.

This makes the design attractive for:

• Frequent maintenance operations
• Large-diameter piping
• Piping requiring regular dismantling
• Corrosion-sensitive systems
• Systems using expensive alloy or stainless-steel piping
• Installations where bolt alignment is challenging

Material-Saving Potential

One important advantage of Lap Joint Flange assemblies is that the loose flange does not necessarily need to be manufactured from the same expensive material as the wetted stub end. For certain applications, an economical flange material may be paired with a corrosion-resistant stub end, subject to engineering approval and compatibility requirements. This can help control material costs without compromising the required wetted-surface material.

Important Selection Factors

Before sourcing a Lap Joint Flange, consider:

• Nominal pipe diameter
• Stub-end type and dimensions
• Flange pressure class
• Material combination
• Pipe wall thickness
• Facing arrangement
• Gasket compatibility
• Bolt size and pattern
• Operating temperature
• Process-fluid characteristics

The flange and stub end must be treated as a complete engineered connection rather than as independent components.

Industrial Applications

Lap Joint Flanges are commonly considered for:

• Chemical processing plants
• Petrochemical facilities
• Food-processing equipment
• Pharmaceutical piping
• Water-treatment systems
• Corrosive-fluid handling
• Heat exchanger connections
• Process equipment
• Large-diameter industrial pipelines
• Maintenance-intensive piping networks

A Smart Choice for Repeated Dismantling

For piping systems where maintenance access is a frequent requirement, the ability to rotate and remove the flange can save installation time. It can also simplify replacement of gaskets and inspection of connected equipment. However, the design should be selected only where permitted by the applicable piping standard and project engineering specification.

Sohum Industrial Sales Corporation

Sohum Industrial Sales Corporation provides flange and industrial piping solutions for contractors, engineering companies, fabricators, plant operators and procurement teams. With specification-based sourcing and bulk-order support, the company helps customers identify suitable Lap Joint Flange assemblies according to size, material, pressure class and application.

Enquire for Lap Joint Flanges

For Lap Joint Flanges supply across West Bengal, Kolkata, Odisha, Chhattisgarh, Bihar, Arunachal Pradesh, Assam, Manipur, Meghalaya, Mizoram, Nagaland, Tripura and Bhutan, contact Sohum Industrial Sales Corporation. Share your pipe size, flange class, stub-end requirement, material specification and quantity to receive a suitable quotation for your industrial project.