UNS S31803 lap joint flange
Corrosion-Resistant UNS S31803 Lap Joint Flanges Manufacturer in Saudi Arabia
Lap joint flange welding is done on the stub end, while the loose flange stays free to rotate. This duplex steel setup resists general corrosion in most organic and inorganic acids and suits a wide range of pipe joint applications.
At a glance
- Grade: UNS S31803 (EN 1.4462)
- Design: loose flange paired with a stub end
- Pressure classes: 150 – 2500
- Face types: RTJ, RF, FF
- Standard: ASME B16.5
- Best for: systems that need frequent disassembly
A815 S31803 Raised Face Lap Joint Flange Manufacturer in Saudi Arabia
DuplexPipeline supplies UNS S31803 lap joint flanges from Mumbai, machined to exact specifications.
| Parameter | Details |
| Material | UNS S31803 duplex stainless steel |
| Size range | 1/2″ – 24″ NPS |
| Pressure class | 150, 300, 600, 900, 1500, 2500 |
| Face types | RTJ, RF, FF |
| Coating | Anti-rust painting |
| Standard | ASME B16.5 |
| Supply | Made in India, shipped to the Saudi Arabia and worldwide |
ASTM A815 UNS S31803 loose flange
A815 S31803 Raised face lap joint flange
ASTM A815 WP-W Flat face lap joint flange
How Lap Joint Flange Welding Works
- Weld the stub end to the pipe
- Slide the loose flange over the stub end
- Rotate the flange to line up the bolt holes
- Bolt it to the mating flange
The loose flange is not welded, so it can be removed and reused.
Advantages of Lap Joint Flange Welding with Stub Ends
- Easy alignment: the flange rotates freely to match the bolt holes
- Easy maintenance: quick disassembly and reassembly
- Lower cost: stub ends are usually more cost-effective than other joint types
- Reusable: the stub end and flange can be reused across installations
- Flexible positioning: adjust the flange before bolting
Types of Lap Joint Flanges
Flange and stub end sets for lap joint flange welding on Saudi Arabia projects:
| Type | Key details |
| Loose flange | Free to rotate on the stub end |
| Raised face lap joint | Flat lap joint flange with a raised face backing flange |
| Flat face lap joint | Flat sealing face |
| Van Stone lap joint | Also available in class 1500 and 2500 |
| Lap joint stub end | Rotates to align with the backing flange |
| Lapped flange | Class 150 – 2500, anti-rust painting |
DSS buttweld fittings
- Tensile Strength: 415 MPa
- Coating: anti-rust painting
- Pressure class: 150 – 2500
SA 815 s31803 lap joint flange stub end
- Elongation: 50mm
- Face type: Rtj, RF, FF
- Type: loose flange, van stone lap joint
A815 UNS S31803 lap flange joint
- Application: oil and gas
- Size: 1/2″ – 48″
- Yield Strength: 290 MPa
Specification of UNS S31803 Lap Joint Flanges
Chemical composition (%)
| Element | % |
| Carbon (C) | 0.030 max |
| Manganese (Mn) | 2.00 max |
| Silicon (Si) | 1.00 max |
| Phosphorus (P) | 0.030 max |
| Sulphur (S) | 0.020 max |
| Chromium (Cr) | 21.0 – 23.0 |
| Nickel (Ni) | 4.5 – 6.5 |
| Molybdenum (Mo) | 2.5 – 3.5 |
| Nitrogen (N) | 0.08 – 0.20 |
Mechanical properties
| Property | Value |
| Tensile strength | 620 MPa min |
| Yield strength | 450 MPa min |
| Elongation | 25% min |
| Hardness | 293 HB max |
UNS S31803 Lap Joint Flanges Stock in Mumbai for the Saudi Arabia
- Our UNS S31803 lap joint flanges stock covers loose flanges, raised face, flat face, Van Stone and stub ends
- Pressure classes 150 – 2500
- Face types: RTJ, RF and FF
- Delivery anywhere, in any quantity
- To check UNS S31803 lap joint flanges stock for the Saudi Arabia
, send your type, size, class and quantity
Buy UNS S31803 Lap Joint Flanges in the Saudi Arabia from Duplex Pipeline
When you buy UNS S31803 lap joint flanges from us, you get:
- Flanges machined to exact specifications per ASME B16.5
- Online datasheet before ordering
- Factory visit and free sample enquiries welcome
- Quality assurance and worldwide shipping, including the Saudi Arabia
How to order
- Share type, size, pressure class and quantity
- Receive datasheet and quote
- Confirm the order
Quality Tests Before Lap Joint Flange Welding
| Test | What it checks |
| Visual inspection | Appearance, surface finish and overall condition |
| Dimensional inspection | Diameter, thickness, height and bore size |
| NDT methods | Surface and subsurface defects |
Corrosion Resistance of UNS S31803 Lap Joint Flanges
| Environment | Performance |
| Organic and inorganic acids | Good general corrosion resistance |
| Sulfuric, phosphoric, acetic and formic acid | Excellent resistance |
| Seawater and brackish water | Performs well |
| Chloride-containing solutions | Performs well |
Applications
| Industry | Use |
| Oil and gas | Piping that needs frequent disassembly |
| Chemical | Process piping |
| Marine and offshore | Chloride-rich seawater environments |
Frequently Asked Questions
UNS S31803 lap joint flange — Questions Buyers Ask Most
What is a lapped joint flange used for?
What is a stub end?
The pipe-facing component that fits inside the lap joint flange to form the seal
How is lap joint flange welding done?
Does lap joint flange welding allow easy removal?
Yes, only the stub end is welded, so the flange can be removed and rotated.
What pipe joint suits offshore use in the Saudi Arabia?
Lap joint flanges resist chloride corrosion in seawater and marine environments
What sizes are available for UNS S31803 lap joint flanges?
These flanges exhibits good resistance to general corrosion in most organic and inorganic acids making it suitable for a wide range of applications. It shows excellent resistance to corrosion in solutions containing sulfuric acid, phosphoric acid, acetic acid, or formic acid.
UNS S31803 lap joint flange performs well in chloride-rich environments such as seawater, brackish water, and chloride-containing solutions. This makes these flanges highly suitable for applications in marine and offshore industries.
A815 S31803 raised face lap joint flange manufacturer in India
Manufacturers employ several inspection and testing methods to test and verify the quality of the ASTM A815 UNS S31803 loose flange. Visual inspection is employed to check the overall appearance, surface finish and dimensional characteristics of the loose flange.
The dimensional inspection entails measuring the flange’s critical dimensions such as diameter, thickness, height and bore size. NDT methods can be used to detect surface and subsurface defects that compromise the integrity of the A815 UNS S31803 lap flange joint.
Mumbai-based supplier of verified ASTM A182 UNS S31803 lapped flange that are machined to exact specifications for a variety of tests in accordance with ASME b16.5
ASTM A815 UNS S31803 loose flange
A815 S31803 Raised face lap joint flange
ASTM A815 WP-W Flat face lap joint flange
A815 S31803 raised face lap joint flange is a type of flange that consists of two components. These components are a flat, lap joint flange and a backing flange with a raised face.
Raised SA 815 UNS S31803 lapped flange is commonly used in various piping systems where frequent disassembly and reassembly are required. The lap joint design allows for easy installation and removal of the flange connection and makes it convenient for maintenance or modifications.
Select dimensions, standard, pressure temperature rating of ASTM A815 WP-W Flat face lap joint flange
Get the vast selection of SA 815 s31803 lap joint flange stub end delivered anywhere, in any quantity, and in any size!
SA 815 UNS S31803 lapped flange
- Tensile Strength: 415 MPa
- Coating: anti-rust painting
- Pressure class: 150 – 2500
SA 815 s31803 lap joint flange stub end
- Elongation: 50mm
- Face type: Rtj, RF, FF
- Type: loose flange, van stone lap joint
A815 UNS S31803 lap flange joint
- Application: oil and gas
- Size: 1/2″ – 48″
- Yield Strength: 290 MPa
Refer our online datasheet before buying 1.4462 UNS S31803 lap joint pipe flanges, enquire about a factory visit and a free sample.
The ASTM A815 WP-W flat face lap joint flange can be classified depending on their nominal pipe size (NPS) and pressure class. Common types of flanges are ANSI B16.5 class 150, class 300, class 600, and class 900.
A815 S31803 Van Stone lap joint flange is also available in various other pressure classes such as class 1500 and 2500. Consult the applicable project standards to evaluate the accurate dimensions, pressure ratings and specifications for the particular type of flange.
The Nominal Pipe Size or NPS of the ASTM A815 UNS S31803 joint flange material is 1/2″- 24″ inch. And regarding the pressure rating for class 150 of the 1.4462 UNS S31803 lap joint pipe flange is 300 Pound Square Inch or psi.
SA 815 s31803 lap joint flange stub end is usually more cost effective than other types of flange connections. It can be easily rotated to align with the backing flange providing flexibility in positioning.
