Backing Ring Flanges (Backup Flanges) Manufacturer, Supplier

Backing Ring Flanges (Backup Flanges) Manufacturer, Supplier & Technical Guide

Backing Ring Flanges, commonly referred to as Backup Flanges, are essential piping components used with lap joint stub ends to create a strong, economical, and easily maintainable flange connection. Unlike conventional weld neck or slip-on flanges, backing ring flanges are not welded directly to the pipe. Instead, they slide freely over the pipe and work together with a lap joint stub end, allowing the flange to rotate independently for easy bolt hole alignment during installation.

This design significantly reduces installation time while improving maintenance efficiency in industries such as oil & gas, petrochemical, chemical processing, marine, water treatment, power generation, food processing, pharmaceutical manufacturing, and offshore engineering.

Creative Forged manufactures and supplies precision-engineered Backing Ring Flanges in accordance with international standards, ensuring superior dimensional accuracy, corrosion resistance, mechanical strength, and long service life. Browse our complete range of products on our Backup Flange product page.

What is a Backing Ring Flange?

A Backing Ring Flange is a loose flange designed to work together with a lap joint stub end. Since the flange itself never comes into contact with the process media, only the stub end requires corrosion-resistant material. This makes backing ring flanges one of the most economical flange solutions for expensive alloy piping systems.

The flange slides over the pipe before the stub end is welded. During assembly, the backing flange rotates freely, allowing quick alignment of bolt holes without rotating the pipe itself. This feature is particularly valuable for large-diameter pipelines and heavy industrial installations.

Major Features

• Free rotating flange for easy alignment
• Used exclusively with lap joint stub ends
• Reduces installation time
• Excellent for frequent dismantling
• Lower overall piping cost
• Suitable for expensive alloy piping systems
• Reusable during maintenance
• Available in multiple international standards

Available Materials

Creative Forged manufactures backup flanges using premium-quality raw materials sourced from certified mills. Material selection depends upon operating temperature, pressure, corrosion resistance, and application requirements.

Material	Available Grades
Stainless Steel	SS 304, 304L, 316, 316L, 310, 321, 347, 904L
Carbon Steel	ASTM A105, A350 LF2, A694
Alloy Steel	F5, F9, F11, F22, F91
Duplex Steel	UNS S31803, S32205
Super Duplex	UNS S32750, S32760
Nickel Alloy	Inconel 600, 625, 718
Monel	Monel 400
Hastelloy	C22, C276
Titanium	Grade 2, Grade 5

Among these materials, Stainless Steel 304 and Stainless Steel 316 are the most widely used due to their excellent corrosion resistance, durability, and cost-effectiveness.

Standards and Specifications

Creative Forged manufactures backing ring flanges according to globally accepted piping standards.

Specification	Available Standards
ASME	ASME B16.5
Large Diameter	ASME B16.47 Series A & Series B
British Standard	BS4504
BS Standard	BS10
Australian Standard	AS2129
European Standard	EN1092-1
DIN	DIN 2573, DIN 2576, DIN 2633

Pressure Ratings

• Class 150
• Class 300
• Class 400
• Class 600
• Class 900
• Class 1500
• Class 2500
• PN6
• PN10
• PN16
• PN25
• PN40
• PN64
• PN100

Available Sizes

Standard manufacturing ranges from 1/2 inch (15 NB) up to 48 inches (1200 NB). Larger custom diameters can also be manufactured based on project specifications.

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Advantages of Backing Ring Flanges

• Fast and simple installation
• Easy bolt hole alignment
• Reduced maintenance downtime
• Lower installation costs
• Ideal for corrosive environments
• Can be reused during maintenance
• Excellent for lined piping systems
• Compatible with multiple international standards
• Suitable for high-pressure applications
• Excellent dimensional stability

Manufacturing Process

Every backing ring flange manufactured by Creative Forged undergoes a controlled production process to ensure dimensional precision and long-term performance.

1. Selection of certified raw material.
2. Hot forging or precision machining.
3. CNC turning for accurate dimensions.
4. Drilling of bolt holes.
5. Surface finishing.
6. Heat treatment where applicable.
7. Dimensional inspection.
8. Final quality testing.
9. Marking and traceability.
10. Protective packaging for shipment.

Each manufacturing stage follows strict quality management procedures to comply with customer specifications and international standards.

 

Quality Testing & Inspection

Quality assurance is one of the most important aspects of flange manufacturing. Every production batch undergoes comprehensive inspection before dispatch.

• Visual Inspection
• Dimensional Inspection
• PMI (Positive Material Identification)
• Chemical Analysis
• Mechanical Testing
• Hardness Testing
• Ultrasonic Testing
• Radiographic Testing
• Dye Penetrant Testing
• Third Party Inspection available upon request

Inspection reports including EN 10204 3.1 Mill Test Certificates can be supplied with every shipment.

Industrial Applications

Backing ring flanges are widely used in piping systems where easy maintenance, frequent dismantling, and corrosion resistance are important. Their ability to rotate independently simplifies installation and minimizes downtime during equipment servicing.

• Oil & Gas Refineries
• Petrochemical Plants
• Chemical Processing Industries
• Water Treatment Plants
• Power Generation Facilities
• Marine Engineering
• Shipbuilding
• Offshore Platforms
• Food Processing Industries
• Pharmaceutical Plants
• Paper & Pulp Industries
• Fertilizer Plants
• Mining Operations
• Desalination Plants

Leading Backing Ring Flange Manufacturers

The global market includes several trusted manufacturers and suppliers known for producing high-quality backing ring flanges. Among the recognized names are Aakash Steel, Creative Piping, and World Rings, offering products in stainless steel, carbon steel, alloy steel, duplex, super duplex, and nickel alloys to meet international piping standards.

Creative Forged supplies precision-manufactured backing ring flanges that comply with ASME, ANSI, EN, BS, DIN, and other international specifications for industrial projects worldwide.

Why Choose Creative Forged?

• International manufacturing standards
• Premium certified raw materials
• Modern CNC machining facilities
• Strict quality inspection procedures
• Fast production schedules
• Custom sizes and materials available
• Worldwide export capability
• Competitive pricing
• Technical engineering support
• Reliable packaging and documentation

Whether your project requires stainless steel, carbon steel, duplex, super duplex, or high-performance nickel alloy backing ring flanges, Creative Forged delivers dependable products engineered for safety, durability, and long-term industrial performance.

Frequently Asked Questions

What is the difference between a backing ring flange and a lap joint flange?

The terms are often used interchangeably. A backing ring flange is the loose flange component that works together with a lap joint stub end to create a lap joint flange assembly.

What materials are commonly used?

Common materials include Stainless Steel 304, 304L, 316, 316L, Carbon Steel, Alloy Steel, Duplex Steel, Super Duplex, Inconel, Monel, Hastelloy, and Titanium.

What size range is available?

Standard production ranges from 1/2 inch (15 NB) to 48 inches (1200 NB), with larger custom sizes available upon request.

Which standards are supported?

ASME B16.5, ASME B16.47 Series A & B, BS4504, BS10, EN1092-1, AS2129, and DIN standards.

Where can I view the complete product range?

You can explore our complete collection of industrial-grade backing ring flanges by visiting our Backup Flange product page, where you’ll find detailed specifications, available materials, sizes, and manufacturing capabilities.

Technical Specifications of Backing Ring Flanges

Backing Ring Flanges are designed to provide a cost-effective and flexible flange connection when used in combination with lap joint stub ends. Their loose design enables quick alignment during installation while reducing the need for rotating the connected piping system. They are extensively used in industries where pipelines require periodic inspection, maintenance, or replacement.

Property	Specification
Product Name	Backing Ring Flange / Backup Flange
Type	Loose Plate Flange
Connection	Used with Lap Joint Stub End
Manufacturing Method	Forged / CNC Machined / Plate Machined
Pressure Classes	150, 300, 400, 600, 900, 1500, 2500
Metric Ratings	PN6, PN10, PN16, PN25, PN40, PN64, PN100
Nominal Size	15 NB (1/2″) to 1200 NB (48″)
Face Type	Flat Face (FF)
Applicable Temperature	Depends on material grade and pressure class
Corrosion Resistance	Excellent with stainless steel and high-alloy grades

How Does a Backing Ring Flange Work?

A backing ring flange works together with a lap joint stub end rather than connecting directly to the pipe. During installation, the flange is first slipped over the pipe. The lap joint stub end is then butt welded to the pipe, trapping the backing flange between the pipe and the stub end. Once assembled, the flange remains free to rotate independently.

This rotating feature provides a significant advantage during installation because the installer can easily align bolt holes without rotating long pipe sections. In large industrial piping systems where hundreds of flange connections exist, this considerably reduces installation time and labor costs.

Since the process fluid contacts only the lap joint stub end, the backing flange itself can often be manufactured using a more economical material while maintaining the required corrosion resistance through the stub end. This combination substantially lowers the overall project cost, especially in stainless steel and nickel alloy piping systems.

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Benefits of Using Backup Flanges

• Quick and easy installation in confined spaces.
• Excellent bolt hole alignment without rotating the pipeline.
• Reduced installation manpower.
• Lower maintenance costs.
• Suitable for piping systems requiring regular dismantling.
• Ideal for expensive corrosion-resistant piping materials.
• Minimizes flange replacement costs.
• Long operational service life.
• Compatible with automated piping fabrication.
• Excellent dimensional stability under operating conditions.

Backing Ring Flange vs Weld Neck Flange

Feature	Backing Ring Flange	Weld Neck Flange
Pipe Welding	Not welded directly	Butt welded
Rotation	Free rotating	Fixed
Bolt Alignment	Very Easy	Requires pipe rotation
Maintenance	Excellent	Moderate
Installation Time	Low	Higher
Cost for Alloy Systems	Economical	Higher
Suitable for Frequent Dismantling	Yes	No

Typical Surface Finishes

Depending on the application and customer requirements, backing ring flanges are available with different surface finishes to improve corrosion resistance and appearance.

• Natural Machine Finish
• Shot Blasted Finish
• Pickled & Passivated Finish
• Glass Bead Finish
• Black Painted Finish
• Anti-Rust Oil Coating
• Zinc Coating
• Hot Dip Galvanized Finish

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Packaging and Export

Creative Forged follows international export packaging standards to ensure products reach customers in excellent condition. Every flange is individually marked with material grade, heat number, size, pressure class, and applicable standard for complete traceability.

• Plastic end protection
• Waterproof wrapping
• Bubble protection
• Plywood boxes
• Wooden pallets
• Steel strapped export packaging
• Customer-specific marking available

Available Documentation

Complete quality documentation can be supplied with every order based on customer requirements.

• EN 10204 3.1 Mill Test Certificate
• Raw Material Certificate
• Heat Treatment Report
• PMI Report
• Dimensional Inspection Report
• Mechanical Test Report
• Chemical Analysis Report
• Third Party Inspection Certificate
• Packing List
• Certificate of Origin

Why Industries Prefer Creative Forged

Creative Forged has established itself as a trusted manufacturer and supplier of industrial flanges by delivering precision-engineered products that meet international quality requirements. Every backing ring flange is manufactured using advanced CNC machinery, premium-grade raw materials, and rigorous quality control procedures to ensure outstanding performance in demanding industrial environments.

Our manufacturing capabilities include standard and custom sizes, multiple material grades, and compliance with globally recognized standards such as ASME, ANSI, EN, DIN, BS, and AS. Whether your project involves offshore platforms, petrochemical plants, refineries, chemical processing units, or power generation facilities, our engineering team can provide reliable flange solutions tailored to your specifications.

To learn more about our manufacturing capabilities and available products, visit our dedicated Backup Flange page. Our technical team can assist you in selecting the appropriate material grade, pressure rating, dimensions, and applicable international standards for your project.

Request a Quote

If you are looking for high-quality Backing Ring Flanges or Backup Flanges, Creative Forged offers a comprehensive range of products manufactured to international specifications. Our experienced engineers are available to help you choose the right flange based on operating pressure, temperature, corrosion requirements, piping standards, and application needs.

Contact Creative Forged today for competitive pricing, technical assistance, custom manufacturing, and worldwide delivery of premium industrial backing ring flanges.

Frequently Asked Questions About Backing Ring Flanges

What is a Backing Ring Flange?

A Backing Ring Flange, also known as a Backup Flange, is a loose flange used with a lap joint stub end to create a secure bolted pipe connection. Since the flange rotates freely, it simplifies bolt hole alignment and is widely used in industrial piping systems requiring frequent maintenance.

What is the difference between a Backing Ring Flange and a Lap Joint Flange?

A Backing Ring Flange is the loose flange component, while a Lap Joint Flange assembly consists of the backing flange used together with a lap joint stub end. Both terms are commonly used interchangeably in the piping industry.

What materials are available for Backing Ring Flanges?

Creative Forged manufactures Backing Ring Flanges in Stainless Steel, Carbon Steel, Alloy Steel, Duplex Steel, Super Duplex Steel, Inconel, Monel, Hastelloy, Titanium, and other special alloys to meet industrial requirements.

What stainless steel grades are commonly used?

The most popular grades include Stainless Steel 304, 304L, 316, 316L, 310, 321, 347, and 904L. Grade selection depends on operating temperature, corrosion resistance, and the process media.

Which international standards do your Backing Ring Flanges comply with?

Our products are manufactured according to ASME B16.5, ASME B16.47 Series A & B, ANSI, BS4504, BS10, EN1092-1, DIN, and AS2129 standards to ensure global compatibility.

What sizes are available?

Backing Ring Flanges are available from 1/2 inch (15 NB) to 48 inches (1200 NB). Larger custom sizes can also be manufactured based on project specifications.

What pressure ratings are available?

We manufacture Backing Ring Flanges in ASME pressure classes 150, 300, 400, 600, 900, 1500, and 2500, along with metric pressure ratings including PN6, PN10, PN16, PN25, PN40, PN64, and PN100.

Why are Backing Ring Flanges preferred in stainless steel piping?

Only the lap joint stub end comes into contact with the process fluid. This allows the backing flange to be manufactured from a more economical material, significantly reducing the overall cost of expensive stainless steel and alloy piping systems.

Where are Backing Ring Flanges used?

Backing Ring Flanges are widely used in oil and gas, petrochemical plants, chemical processing, offshore platforms, marine engineering, desalination plants, power generation, pharmaceutical manufacturing, food processing, and water treatment facilities.

Can Backing Ring Flanges be customized?

Yes. Creative Forged manufactures custom Backing Ring Flanges according to customer drawings, international standards, special dimensions, material grades, pressure classes, and project specifications.

What quality tests are performed?

Every flange undergoes dimensional inspection, PMI testing, chemical analysis, mechanical testing, hardness testing, ultrasonic testing, dye penetrant testing, and visual inspection. Third-party inspection is available upon request.

Does Creative Forged export Backing Ring Flanges worldwide?

Yes. We supply industrial Backing Ring Flanges to customers across the Middle East, Asia, Europe, Africa, North America, South America, and Oceania with complete export documentation and international shipping support.

Why choose Creative Forged as your Backing Ring Flange manufacturer?

Creative Forged combines advanced CNC machining, certified raw materials, strict quality control, international manufacturing standards, competitive pricing, and reliable global logistics to deliver premium-quality Backing Ring Flanges for demanding industrial applications.

Global Export Markets

Creative Forged supplies premium Backing Ring Flanges to customers across more than 50 countries worldwide, serving the oil & gas, petrochemical, marine, power, and process industries.