Flanges Supplier in the UAE
Flanges are the bolted connection points of every piping system. They form the interface where pipes meet valves, pumps, vessels, and equipment, and the joint that gets opened for every inspection, cleaning, and modification over the plant’s life. Manufactured to ASME B16.5 and B16.47 in pressure Classes 150 through 2500, forged flanges give UAE facilities a leak-tight, gasket-sealed joint that can be broken and remade without cutting the line, something no welded connection can offer.
Riyaarth Overseas is a reliable flanges supplier in the UAE, operating as a manufacturer, stockist, and exporter for procurement departments, EPC contractors, valve and pump OEMs, fabricators, and importers across Dubai, Abu Dhabi, Sharjah, and the wider GCC. We supply forged flanges from 1/2″ to 48″ NB in carbon steel, stainless steel, alloy steel, duplex, super duplex, and nickel alloys, dimensionally matched to the pipe, butt-weld, and forged fitting stock we already hold, so complete flanged spools ship from one source.
Types of flanges we supply:
- Weld Neck Flanges: the standard for high-pressure and critical hydrocarbon service, butt-welded with a tapered hub that reinforces the joint
- Slip-On Flanges: economical and easy to align, fillet-welded for low- and moderate-pressure utility lines
- Blind Flanges: used to close line ends, vessel nozzles, and future tie-in points
- Socket Weld Flanges: for small-bore, high-pressure connections, paired with our ASME B16.11 fitting range
- Threaded Flanges: for low-pressure systems and locations where hot work is restricted
- Lap Joint Flanges: used with stub ends, allowing bolt-hole rotation and cost savings on alloy lines
- Plate Flanges: for structural, ducting, and non-pressure applications
All pressure flanges conform to ASME B16.5 (1/2″ to 24″) and ASME B16.47 Series A and B / MSS SP-44 (26″ and above), with EN 1092-1 PN-rated flanges available for European-specification projects in the UAE.
For current flange prices in the UAE, send your type, size, class, facing, and material list to Riyaarth Overseas, and our team will return an itemised quotation with delivery terms to your Emirate.
Specifications of Flanges
| Parameter | Specification |
|---|---|
| Dimensional Standards | ASME B16.5, ASME B16.47 Series A and B, MSS SP-44, API 605, AWWA C207, EN 1092-1 |
| Material Standards | ASTM A105 / A350 / A694 / A182 (with ASME SA equivalents); ASTM B-series for nickel alloys |
| Types | Weld Neck, Slip-On, Blind, Socket Weld, Threaded, Lap Joint, Spectacle Blind, Reducing, Plate |
| Size Range | 1/2" (15 NB) to 48" (1200 NB) |
| Pressure Ratings | ASME Class 150, 300, 600, 900, 1500, 2500; EN PN6 to PN64 |
| Face Types | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ) |
| Face Finish | Serrated 125 to 250 AARH standard; smooth or special finish on request |
| Surface Protection | Anti-rust oil / black paint / yellow transparent (CS); pickled and passivated (SS/duplex); zinc plating and galvanizing on request |
| Marking | Grade, size, class, facing, heat number, and standard stamped per B16.5 |
| Packing | Wooden cases/pallets with face protection for sea freight to UAE ports |
Flange Dimension Chart (ASME B16.5, Class 150, Raised Face)
| NPS | Flange OD (mm) | Min Thickness (mm) | Bolt Circle (mm) | No. of Bolts |
|---|---|---|---|---|
| 1/2" | 88.9 | 11.2 | 60.3 | 4 |
| 1" | 108.0 | 14.2 | 79.4 | 4 |
| 2" | 152.4 | 19.1 | 120.7 | 4 |
| 4" | 228.6 | 23.9 | 190.5 | 8 |
| 6" | 279.4 | 25.4 | 241.3 | 8 |
| 8" | 342.9 | 28.4 | 298.5 | 8 |
| 10" | 406.4 | 30.2 | 362.0 | 12 |
| 12" | 482.6 | 31.8 | 431.8 | 12 |
Dimensions above are for Class 150; every class has its own OD, thickness, and bolting pattern. Weld neck flanges are additionally bored to match your pipe schedule, so always state the bore (for example, “6” Class 300 WNRF, Sch 40 bore, A105″) when ordering, and we will confirm each line item against B16.5.
Mechanical Properties
| Material / Grade | Tensile Strength (min) | Yield Strength (min) | Elongation (min) | Typical Matching Pipe |
|---|---|---|---|---|
| ASTM A105 (Carbon Steel) | 485 MPa | 250 MPa | 22% | A106 Gr B / A53 Gr B |
| ASTM A350 LF2 (Low-Temp CS) | 485 to 655 MPa | 250 MPa | 22% (impact tested at minus 46°C) | A333 Gr 6 |
| ASTM A694 F52 (High-Yield CS) | 455 MPa | 360 MPa | 20% | API 5L X52 line pipe |
| ASTM A182 F316L (Stainless) | 485 MPa | 170 MPa | 30% | A312 TP316L |
| ASTM A182 F51 (Duplex 2205) | 620 MPa | 450 MPa | 25% | A790 Duplex |
| ASTM A182 F53 (Super Duplex 2507) | 800 MPa | 550 MPa | 15% | A790 Super Duplex |
| ASTM A182 F91 (9Cr Alloy Steel) | 585 MPa | 415 MPa | 20% | A335 P91 |
A694 grades (F42 through F70) match the yield strength of API 5L X-grade line pipe, so pipeline flanged joints carry the same strength as the pipe wall. This makes them the correct call-out for UAE transmission and gathering systems.
Chemical Composition
| Element | A105 | A182 F316L | A182 F51 (Duplex) |
|---|---|---|---|
| Carbon (C) | 0.35 max | 0.030 max | 0.030 max |
| Chromium (Cr) | 0.30 max* | 16.0–18.0% | 21.0–23.0% |
| Nickel (Ni) | 0.40 max* | 10.0–15.0% | 4.5–6.5% |
| Molybdenum (Mo) | 0.12 max* | 2.0–3.0% | 2.5–3.5% |
| Nitrogen (N) | — | — | 0.08–0.20% |
| Manganese (Mn) | 0.60–1.05% | 2.0 max | 2.0 max |
| Phosphorus (P) | 0.035 max | 0.045 max | 0.030 max |
| Sulphur (S) | 0.040 max | 0.030 max | 0.020 max |
| Silicon (Si) | 0.10–0.35% | 1.00 max | 1.00 max |
*Residual element limits in A350 LF2. Certified chemistry for every supplied grade appears on the EN 10204 3.1 mill test certificate accompanying each heat.
Flange Materials We Supply to the UAE
Carbon Steel: ASTM A105/A105N, A350 LF1/LF2/LF3, A694 F42 to F70
The volume materials for UAE plant and pipeline flanges. A105 covers standard and high-temperature duty; A105N (normalised) and A350 LF2 handle impact-tested and low-temperature call-outs down to minus 46°C; A694 high-yield grades match X-grade line pipe on transmission systems.
Stainless Steel: ASTM A182 F304/304L, F316/316L, F310, F321, F904L
Corrosion-resistant flanges for water treatment, food and pharma skids, HVAC, and coastal-atmosphere piping. F316L is the regional workhorse; F310 and F321 cover high-temperature duty, and F904L serves aggressive acid applications.
Duplex and Super Duplex: ASTM A182 F51/F60, F53/F55
High-strength flanges in Duplex 2205 and Super Duplex 2507/Zeron 100 type for seawater, desalination, and offshore service. These are grade-matched to our A790 pipe, A815 buttweld, and forged fitting stock so the entire flanged spool is metallurgically consistent.
Alloy Steel: ASTM A182 F1, F5, F9, F11, F22, F91
Chrome-moly flanges for refinery heaters, steam headers, and power plant piping, matched to A335 P-grade pipe and supplied in the correct heat-treated condition with hardness control, including F91 for advanced supercritical service.
Nickel Alloys: Inconel, Monel, Hastelloy, Alloy 20
Flanges for the most severe corrosion and temperature conditions, including sour gas, hot acids, and chemical processing beyond super duplex capability. Available against project orders with full alloy traceability, in RTJ facing where the line class demands it.
Applications of Flanges in the UAE
Every valve, pump, strainer, and vessel in a UAE facility connects to the piping through flanges, which makes them one of the highest-volume procurement items on any project MTO. Our flange supply supports:
- Oil & Gas: Weld neck and RTJ flanges on wellhead, gathering, and process piping, onshore and offshore
- Pipelines: A694 high-yield weld necks and spectacle blinds on API 5L transmission and station piping
- Refineries & Petrochemicals: Alloy steel flanges on hot units, with full Class 150 to 2500 coverage across process and utility systems
- Desalination & Seawater Systems: Duplex and super duplex flanges on intake, brine, and SWRO high-pressure piping
- District Cooling & HVAC: Large-diameter Class 150 slip-on and weld neck flanges on chilled water headers
- Fire Protection: A105 flanges on pump rooms, ring mains, and valve stations in civil defence-approved systems
- Power Generation: F11/F22/F91 flanges on steam piping, plus stainless flanges on water treatment circuits
- Marine & Shipyards: Flanged connections for seawater, ballast, and deck piping in corrosion-resistant grades
- Water & Wastewater: AWWA and PN-rated flanges on municipal transmission and treatment plant piping
- EPC & Valve Assembly: Complete flange packages with matched gasket contact faces delivered to yards and workshops in Dubai, Sharjah, and Abu Dhabi
Flanges fail projects quietly. A wrong facing, an unmatched bore, or a Series A/Series B mix-up on large diameters can stall bolting for weeks, which is why line-item verification against your data sheets before dispatch is a standard part of how we supply the UAE market.
Quality Assurance
Every flange consignment from Riyaarth Overseas is verified against ASME B16.5/B16.47 dimensions and the governing ASTM material standard before dispatch. Our quality process includes:
- Heat-number traceability with EN 10204 Type 3.1 mill test certificates; 3.2 third-party certification on request
- Dimensional inspection of OD, thickness, bolt circle, bolt holes, hub, and bore, with facing dimensions per B16.5
- Face finish verification, with serrations gauged to the specified AARH range and RTJ groove dimensions checked per B16.20 ring size
- Tensile and hardness verification per the applicable ASTM standard, with A105 hardness capped at 187 HB for sour service
- Charpy impact testing at minus 46°C for A350 LF2 and at project-specified temperatures per the ITP
- Heat treatment confirmation: normalising for carbon steel grades, solution annealing for stainless and duplex
- Positive Material Identification (PMI) on stainless, duplex, alloy, and nickel flanges on request
- UT on forgings and MPI/PT surface examination where specified, plus ASTM A262 and A923/G48 testing for critical-service stainless and duplex
- Marking, face protection, and export packing inspection before containerisation
FAQs
Products
Industry We Serve
- Oil & Gas industries
- Chemical process industries
- Pump and valve in high pressure component
- Food industries
- Pulp and paper industry
- Aerospace industry
- Power plant
- Mechanical component
- Sugar industry
- Cement industry