Lap Joint Flange Manufacturer & Supplier in Mumbai

Nishra Overseas manufactures and supplies Lap Joint Flange in Mumbai for piping systems where easy alignment, repeated disassembly, and maintenance access are important. A lap joint flange, also called a loose ring or backing flange, is used together with a lap joint stub end that is welded to the pipe. Unlike a conventional weld neck or slip-on flange, the backing flange is not welded directly to the pipe. It fits over the stub end and is bolted to the mating flange, allowing the flange ring to rotate for easier bolt-hole alignment.

Lap joint flange assemblies are particularly useful for piping systems that require frequent inspection, cleaning, maintenance, or dismantling. They can be supplied in stainless steel, carbon steel, alloy steel, duplex and other specified materials, depending on the piping specification and service conditions. Material selection depends on pressure, temperature, process fluid, corrosion environment, flange class and compatibility between the stub end and piping system. Nishra Overseas is an ISO 9001:2015 certified manufacturer, stockist and exporter with more than 25 years of industry experience.

Lap Joint Flange Manufacturer in Mumbai

As a Lap Joint Flange Manufacturer in Mumbai, Nishra Overseas supplies lap joint flange assemblies according to applicable dimensional standards, material specifications and project requirements. The manufacturing process for the loose flange ring generally involves suitable raw material preparation, forging or flange-forming operations, heat treatment where required, precision machining, bolt-hole drilling, facing and dimensional inspection.

The stub end is a critical part of the assembly because it provides the pipe-facing sealing surface and is welded to the pipe. Therefore, the flange and stub-end dimensions must be compatible with the specified piping system.

Typical manufacturing and finishing operations include:

Raw material selection and identification
Forging or suitable flange forming
Heat treatment where required by material specification
CNC or precision machining
Bolt-hole drilling and dimensional control
Flange-face machining
Bore and inside-diameter machining
Stub-end dimensional verification where supplied
Surface inspection
Marking and traceability
Final dimensional inspection

ASME B16.5 specifies dimensional relationships for lap joint flanges and lap joint stub ends, including applicable facing configurations.

Lap Joint Flange Supplier in Mumbai

Nishra Overseas is a Lap Joint Flange Supplier in Mumbai serving EPC contractors, fabricators, OEMs, engineering companies, consultants and industrial procurement teams.

Supply can be arranged according to nominal pipe size, pressure class, material grade, facing configuration, stub-end requirement, quantity and inspection specification. Buyers can provide piping class documents, drawings or project datasheets to ensure the flange and stub-end arrangement is matched correctly.

For project procurement, documentation such as Mill Test Certificates, material traceability, PMI and third-party inspection can be supported where specified by the purchase order or project requirements.

Lap Joint Flange Exporter in Mumbai

Nishra Overseas also supports international industrial procurement as a Lap Joint Flange Exporter in Mumbai. The company states that its industrial product range is exported to more than 50 countries across the USA, Europe, Middle East, Asia and Australia.

Export orders can be supplied with applicable material certificates, inspection documentation, traceability information and suitable export packaging according to project requirements. Shipping documentation and delivery arrangements are finalized according to the destination, purchase order and customer requirements.

Lap Joint Flange Specifications

Lap joint flange specifications depend on the applicable flange standard, pressure class, nominal pipe size, material and stub-end configuration.

Parameter	Specification / Availability
Product	Lap Joint Flange / Loose Ring Flange
Assembly	Lap Joint Flange + Stub End
Standard	ASME B16.5 or applicable project standard
Material	Carbon Steel, Stainless Steel, Alloy Steel, Duplex and specified alloys
Manufacturing	Forged / formed and machined as applicable
Pressure Class	As specified by project requirement
Size	According to applicable dimensional standard
Facing	Flat Face / specified lap-joint configuration
Bore	According to compatible stub-end and pipe requirement
Bolt Holes	According to applicable flange standard
Surface Finish	As specified by project requirement
Heat Treatment	As required by material specification
Stub End	Short-pattern or long-pattern configuration as specified
Inspection	According to purchase order/project specification
Documentation	MTC and inspection documentation where required
Custom Requirements	Subject to technical feasibility

ASME B16.5 covers pipe flanges and flanged fittings within its applicable size and pressure-class range and specifically addresses lap joint flange and stub-end configurations. For larger-diameter piping, another applicable flange standard may be specified by the project.

Features of Lap Joint Flange

Lap joint flanges are selected for specific piping arrangements where flange rotation and ease of disassembly provide practical installation or maintenance benefits.

Key features include:

Loose backing flange design
Used with a welded lap joint stub end
Flange ring can rotate for bolt-hole alignment
Easier installation where alignment is difficult
Suitable for frequent dismantling and maintenance
Reduced need to rotate the connected pipe during assembly
Available in multiple material grades
Compatible with different stub-end material combinations
Available across specified pressure classes
Suitable for project-specific flange facings
Supports material traceability and inspection documentation
Useful for piping systems requiring repeated access

A major procurement advantage is the ability to use a suitable stub-end material at the wetted pipe connection while selecting the backing flange material according to the mechanical and economic requirements of the assembly.

Applications of Lap Joint Flange

Lap joint flanges are commonly selected for piping systems where components need to be dismantled regularly or where flange alignment during installation is a practical concern.

Typical applications include:

Process piping systems
Oil and gas facilities
Petrochemical plants
Chemical processing
Refineries
Food and pharmaceutical processing
Water treatment systems
Marine piping
Equipment connections
Plant maintenance systems
Pipeline and utility systems
Industrial process installations

Their loose-ring configuration can be particularly useful in systems requiring frequent cleaning, inspection, maintenance or replacement of connected components.

Industries We Serve

Nishra Overseas supplies lap joint flange requirements for:

Oil & Gas
Petrochemical
Refineries
Chemical Processing
Power Generation
Water Treatment
Marine & Offshore
Pharmaceutical
Food Processing
Heavy Engineering
Industrial Manufacturing
EPC Projects
Plant Maintenance

The product is relevant to EPC contractors, OEMs, fabricators, engineering consultants, project contractors and procurement teams working from piping specifications and equipment datasheets.

Standards & Specifications

ASME B16.5 is a key standard for pipe flanges and flanged fittings and includes dimensional requirements for lapped joint flanges and lap joint stub ends. The standard specifies lap-joint flange facing arrangements and dimensional relationships between the flange and stub end.

Common material specifications can include ASTM A105 for carbon steel forgings and ASTM A182 for specified stainless steel and alloy steel forgings, depending on the selected material grade and project requirement. The exact material specification must be confirmed from the purchase order or piping specification.

For larger sizes or special configurations, the applicable project standard should be confirmed before manufacturing.

Quality Standards & Testing of Lap Joint Flange

Quality control focuses on material identity, dimensional accuracy, flange geometry, facing and compatibility with the associated stub end.

Depending on project requirements, inspection may include:

Raw material verification
Chemical composition analysis
Mechanical testing
Tensile testing
Hardness testing where applicable
Dimensional inspection
Flange thickness inspection
Bolt-hole inspection
Bore and diameter inspection
Facing and surface inspection
Visual inspection
PMI testing where required
Heat and lot traceability
Third-party inspection where specified
Mill Test Certificate documentation

Nishra Overseas states that it provides original MTCs, PMI testing, third-party inspection acceptance and material traceability through heat and lot marking. The company also states that it operates with ISO 9001:2015 certification.

How to Select the Right Lap Joint Flange

Before ordering a lap joint flange, buyers should confirm:

Size: Match the nominal pipe size and stub-end dimensions.
Pressure Class: Select according to design pressure and temperature.
Material: Consider process fluid, corrosion and mechanical requirements.
Grade: Specify the required ASTM or project material grade.
Stub End: Confirm short or long pattern and compatible dimensions.
Facing: Verify the required mating and sealing arrangement.
Bore: Ensure compatibility with the pipe and stub end.
Standard: Confirm ASME B16.5 or another project-specific standard.
Temperature: Check material suitability at operating conditions.
Inspection: Specify MTC, PMI, NDE or third-party inspection where required.
Quantity: Provide project quantity and delivery schedule.

Correct selection requires considering the flange and stub end as an assembly rather than treating the loose flange ring as an independent pipe connection.

Why Choose Nishra Overseas for Lap Joint Flange?

Nishra Overseas combines more than 25 years of industry experience with manufacturing, stockist and export capabilities. The company states that it supplies industrial flanges in multiple materials, pressure classes, facing configurations and project-specific requirements.

Key procurement support includes:

25+ years of industry experience
ISO 9001:2015 certification
Original Mill Test Certificates
PMI testing where required
Material traceability
Third-party inspection acceptance
Technical support
Industrial project supply
Export capability to 50+ countries

Lap Joint Flange Supply for Industrial Projects in Mumbai

Nishra Overseas supplies Lap Joint Flange in Mumbai for process piping projects, plant construction, equipment connections, maintenance activities, shutdown requirements, fabrication work and industrial expansion projects.

For accurate project supply, procurement teams should provide the flange size, pressure class, material grade, stub-end type, facing requirement, applicable standard, quantity, inspection requirements and delivery location.

Get a Quote for Lap Joint Flange in Mumbai

Looking for a Lap Joint Flange Manufacturer in Mumbai, Lap Joint Flange Supplier in Mumbai, or Lap Joint Flange Exporter in Mumbai? Contact Nishra Overseas for technical assistance and a project-based quotation.

For a quotation, provide:

Product type
Material and grade
Nominal pipe size
Pressure class
Stub-end requirement
Facing configuration
Applicable standard
Quantity
Drawing or piping specification
Inspection requirements
Delivery location

Nishra Overseas LLP
302, 3rd Floor, A Wing, Rajgiri Apartment, 13th Khetwadi Back Road, Mumbai 400004, India
Phone: +91-7021931392
Email: sales@nishraoverseas.com