A Lap Joint Flange is a two-piece flange system that combines a loose backing flange and a stub end to create an easy-to-assemble, flexible piping connection.
Ideal for low-pressure, non-critical systems, the Lap Joint Flange in Saudi is widely used in oil & gas, petrochemical, marine, and water treatment industries across Riyadh, Dammam, Jubail, and Jeddah.
It’s particularly valuable in applications where frequent inspection, maintenance, or alignment adjustments are required.
A Lap Joint Flange, also known as a loose flange, consists of two separate components:
Stub End – Welded directly to the pipe.
Backing Flange – Slides freely over the stub end, allowing easy rotation and alignment.
This configuration minimizes the need for precise bolt hole alignment and allows the flange to swivel into position during assembly.
Because the flange does not come in contact with the fluid, it can made from carbon steel even when used with corrosion-resistant pipes, helping reduce overall project costs.
Industrial sectors in Saudi Arabia often require flexible and cost-efficient flange systems that simplify maintenance and reduce downtime.
The Lap Joint Flange perfectly fits these needs with its lightweight design, easy alignment, and reusability.
Easy Alignment: The backing flange rotates freely around the stub end for effortless bolt alignment.
Cost Efficiency: Backing flanges can reused across different systems, lowering replacement costs.
Corrosion Control: The fluid only contacts the stub end, not the backing flange.
Quick Installation & Removal: Ideal for systems that need regular inspection.
Material Flexibility: Combines stainless, carbon, or alloy steel for optimized performance and cost.
Compatibility: Fits standard ASME, ANSI, and ISO pipe dimensions.
Pressure Range: Suitable for Class 150–300 low-to-moderate pressure systems.
Versatile Face Options: Available in Raised Face (RF) and Flat Face (FF) designs.
The Lap Joint Flange, commonly used where frequent dismantling or rotation of flanges is necessary, or where space is limited.
Oil & Gas Pipelines – Simplifies maintenance of low-pressure lines.
Petrochemical Facilities – Ideal for non-corrosive fluid transfer.
Water Treatment Plants – Reliable and cost-effective for low-pressure systems.
Marine Piping Systems – Allows easy rotation and reinstallation.
Food & Beverage Plants – Ensures hygienic, corrosion-resistant connections.
HVAC & Utility Systems – Quick and repeatable connections for flexible maintenance.
ASME B16.5 – Pipe Flanges and Flanged Fittings
ASME B16.47 – Large Diameter Flanges
API 6A – Specification for Wellhead Equipment
ISO 7005 – Metallic Flanges
NACE MR0175 / ISO 15156 – Sour Gas Environment Materials
These certifications ensure that the Lap Joint Flange in Saudi meets the highest global standards for safety, performance, and corrosion resistance.
1. What is the main benefit of a Lap Joint Flange?
It allows easy alignment and reusability, reducing assembly time and cost.
2. What materials are used for the flange and stub end?
The flange is often carbon steel, while the stub end is stainless or alloy steel for corrosion protection.
3. Is it suitable for high-pressure applications?
It’s best suited for low to moderate pressure systems (Class 150–300).
4. Can it be used with plastic or lined pipes?
Yes, it’s compatible with HDPE and PTFE-lined systems.
5. Does it require welding?
Only the stub end, welded to the pipe, while the backing flange remains loose.
6. Is it reusable?
Yes, the backing flange can reused for multiple installations.
7. Where can I buy Lap Joint Flanges in Saudi?
You can purchase from Nassguard, a reliable industrial supplier in Dammam, Jubail, Riyadh, and Jeddah.
The Lap Joint Flange offers an efficient, flexible, and cost-effective solution for low-pressure piping systems that require frequent maintenance or alignment.
With its two-piece design, corrosion resistance, and ease of installation, it is one of the most practical and durable flange systems in Saudi Arabia.
Choose Nassguard for certified, high-quality Lap Joint Flanges in Saudi, trusted across industrial and commercial sectors.
| Specification | Details |
|---|---|
| Product Name | Lap Joint Flange |
| Components | Stub End + Loose Backing Flange |
| Materials | Carbon Steel, Stainless Steel (304 / 316), Alloy Steel, Duplex Steel |
| Sizes | ½″ to 48″ (Custom sizes available) |
| Pressure Ratings | Class 150, 300 |
| Face Type | Raised Face (RF), Flat Face (FF) |
| Standards | ASME B16.5, ASME B16.47, MSS SP-44, API 6A |
| Testing | Hydrostatic, PMI, Ultrasonic, Visual Inspection |
| Finish | Anti-Rust Coated, Polished, or Galvanized |
| Supplier | Nassguard – Saudi Arabia |
