Leading Manufacturer & Exporter of
Slip On Flanges to Qatar
Werner Flanges stands as Qatar's trusted partner for premium quality slip on flanges, serving the nation's dynamic LNG, oil & gas, and petrochemical industries for over two decades. As a certified ASME B16.5 manufacturer and direct exporter to Qatar, we supply slip on flanges that meet the rigorous demands of Qatar's world-class industrial infrastructure, including the North Field expansion projects, Ras Laffan Industrial City, and Mesaieed Industrial Area.
Our slip on flanges are engineered to ASME B16.5, ASME B16.47, and API standards, manufactured from premium materials including Carbon Steel ASTM A105, Stainless Steel grades 304/316/321, Alloy Steel, and Duplex/Super Duplex materials. We serve major Qatari companies including Qatar Petroleum (now QatarEnergy), RasGas, Qatargas, and QAPCO, delivering flanges that withstand the extreme conditions of LNG processing, offshore platforms, and high-pressure petrochemical operations.
With our manufacturing facility strategically located in India and established logistics partnerships with Hamad Port, we ensure reliable delivery to Doha, Ras Laffan, Al Khor, Dukhan, Mesaieed, and all major industrial zones across Qatar within 18-25 days via sea freight, with expedited air freight options available for urgent requirements. Our slip on flanges are supplied complete with full material traceability, third-party inspection certificates, and comprehensive documentation packages that meet QatarEnergy and international procurement standards.
Every slip on flange leaving our facility undergoes stringent quality testing including dimensional inspection, mechanical testing, PMI verification, and non-destructive testing by internationally accredited laboratories. We maintain ISO 9001:2015 certification and comply with NACE MR0175/ISO 15156 standards for sour service applications prevalent in Qatar's hydrocarbon processing facilities.
Slip On Flanges | ISO 9001:2015 Certified | NACE MR0175 / ISO 15156 Compliant | PMI & NDT Tested Quality Assurance
Specifications
| Specification | Details |
|---|---|
| Pressure Rating | Class 150 to Class 2500 |
| Flange Type | Plate Flange |
| Facing Type | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ) |
| Size Range | ½” to 24” (DN 15 to DN 600) |
| Temperature Range | -29°C to +593°C (Depending on Material & Pressure Class) |
| Applications | Oil & Gas, Petrochemical, Power Generation, Water Treatment, Marine & Industrial Sectors |
| Manufacturing Process | Forged / Machined |
| Certification | EN 10204 3.1 / 3.2, IBR, NACE MR0175 / ISO 15156 (as applicable) |
Matel and Grade
| Type of Materials | Common Specifications / Customization Available on Request |
|---|---|
| Duplex Steel | ASTM/ASME A182 F51, F60, F61, UNS S31803, UNS S32205 |
| Super Duplex Steel | ASTM/ASME A182 F53, F55, UNS S32750, UNS S32760, F44 (6Mo) |
| Stainless Steel | ASTM/ASME A182 F304, F304L, F316, F316L, F310, F317L, F321, F347 |
| Carbon Steel | ASTM A105, A350 LF1, LF2, LF3, A266 Class 1/2, A694 F42 to F70, A765 Gr. II |
| Alloy Steel | ASTM/ASME A182 F1, F5, F9, F11, F12, F22 |
| Non-Ferrous Alloys | Titanium, Brass, Admiralty Brass, Copper Nickel, Nickel Alloys, Hastelloy |
| Titanium | ASTM/ASME B381 Gr.1, Gr.2, Gr.5, Gr.7, Gr.12, Gr.16 |
| Copper Nickel | ASTM B151 UNS C70600 (Cu-Ni 90/10), C71500 (Cu-Ni 70/30) |
| Brass, Al-Brass | ASTM B152 UNS C26000, C27200, C28000; ASTM B111 for Al-Brass |
| Nickel Alloys | ASTM B160, B161, B564 – UNS N02200, N02201, N04400, N08800, N08825, N06600, N06601, N06625, Monel K500 |
| Alloy 20 | ASTM B462 UNS N08020 |
| Hastelloy | ASTM B564 UNS N10276 (Hastelloy C276), N06022 (Hastelloy C22) |
| Cladded Materials | ASTM B898, B265, B424 or custom explosion/clad bonding using dissimilar metals |
| Titanium-Steel, Nickel-Steel, Titanium-Copper, Stainless Steel-Carbon Steel, Bimetallic/Trimetallic Combinations |
Types of Flanges
| Slip On Flanges | Raised Face Slip On Flanges | Flat Face Slip On Flanges | RTJ Slip On Flanges | Forged Slip On Flanges |
| High Pressure Slip On Flanges | Long Slip On Flanges | Reducing Slip On Flanges | Industrial Slip On Flanges | Custom Slip On Flanges |
Industries and Applications We Supply
| Industry | Applications |
|---|---|
Oil & Gas Industry |
Upstream Operations: Slip on flanges are extensively used in Qatar’s oil and gas fields including the mature Dukhan Field (producing since 1949) and offshore fields:
Midstream – LNG Processing (Qatar is World’s Largest LNG Exporter): Qatar’s LNG industry, centered at Ras Laffan Industrial City with facilities operated by QatarEnergy, QatarGas, and formerly RasGas, utilizes slip on flanges extensively:
The North Field expansion (largest LNG project globally) extensively specifies ASME B16.5 slip on flanges for non-critical services, with QatarEnergy’s specifications calling for full traceability and third-party inspection. Downstream – Gas Processing:
Offshore Platforms: Qatar’s offshore fields including Al-Shaheen (operated by North Oil Company) and other platforms in Qatari territorial waters:
Seawater injection pumps: F316L stainless steel flanges for injection water systems |
Petrochemical Plants: |
|
| Power Generation |
|
| Construction & Infrastructure |
Doha Metro (First Phase Completed 2019):
Lusail City Development (New City North of Doha): Integrated smart city infrastructure:
Hamad International Airport Expansion:
Qatar 2022 FIFA World Cup Stadiums (Legacy Infrastructure):
Industrial ManufacturingQatar Steel (Part of Industries Qatar): Integrated steel plant at Mesaieed:
Qatalum (Qatar Aluminum): Aluminum smelter using Hall-Héroult process:
Qatar Cement Company:
Food Processing & Cold Storage: Qatar’s growing food security initiatives:
Cold storage: Ammonia refrigeration with A350 LF2 flanges |
Frequently Asked Questions (FAQs)
- 1. Are Werner Flanges slip on flanges certified to ASME B16.5 standards?
-
Yes, all our slip on flanges are manufactured in strict compliance with ASME B16.5 (NPS 1/2″–24″) and ASME B16.47 (NPS 26″–60″). We maintain comprehensive documentation including:
- Material Test Certificates (MTC) per EN 10204 Type 3.1 or 3.2
- Dimensional inspection reports verifying compliance with ASME B16.5 tables
- Heat treatment charts and mechanical test reports
- Third-party inspection certificates from TÜV, DNV, Lloyd’s Register, or other agencies as required
Our manufacturing facility has been audited by QatarEnergy and international EPC contractors, confirming compliance with ASME standards and project-specific requirements.
- 2. What is the typical delivery time for slip on flanges to Qatar?
-
Standard Sea Freight Delivery: 22-28 days total
- Manufacturing: 4-6 weeks (depending on quantity and specifications)
- Sea transit: 18-22 days from Indian ports to Hamad Port
- Customs clearance and inland delivery: 2-3 days
Expedited Air Freight Delivery: 20-24 days total
- Manufacturing: 4-6 weeks (can be expedited for urgent orders)
- Air transit: 6-8 days Mumbai to Doha (door-to-door)
- Ideal for emergency shutdowns or critical path items
For urgent requirements: Delivery within 10-14 days possible for standard sizes/materials. Longer lead times may apply for:
- Large quantities (1000+ pieces)
- Exotic materials (duplex, super duplex, nickel alloys)
- Large bore flanges (36″ and above)
- Custom modifications or non-standard specifications
- 3. Do you supply flanges with NACE MR0175 compliance for sour service?
-
Absolutely. NACE MR0175/ISO 15156 compliant slip on flanges are supplied for Qatar’s sour gas service (H₂S environments).
Material Selection:- Carbon steel: ASTM A105 with controlled hardness (<22 HRC maximum)
- Stainless steel: A182 F316/316L with solution annealing
- Duplex: F51 with proper heat treatment
- Alloy steel: F11/F22 normalized and tempered
Quality Requirements:
- Hardness testing on every flange (100% inspection)
- PMI testing to verify correct material grade
- Sulfide stress cracking (SSC) test reports available
- Heat treatment verification and documentation
Documentation:
- NACE compliance certificates
- Material hardness reports showing <22 HRC (or <237 HBW)
- Chemical composition analysis
- Heat treatment certification
We have extensive experience supplying NACE-compliant flanges for Qatar’s offshore platforms, gas processing facilities, and petrochemical plants.
- 4. Can you provide third-party inspection certificates from TÜV or DNV?
-
Yes. Third-party inspection (TPI) is available from recognized agencies:
- TÜV Rheinland / TÜV SÜD (Germany)
- DNV (Norway)
- Lloyd’s Register (UK)
- Bureau Veritas (France)
- SGS (Switzerland)
- Applus+ / RTD (Spain)
- RINA (Italy)
Inspection Services:
- Raw material verification at steel mill
- Witness forging and heat treatment
- Witness mechanical testing (tensile, impact, hardness)
- Dimensional inspection verification
- NDT witnessing (UT, MPI, LPI)
- Final visual inspection and documentation review
- EN 10204 Type 3.2 certification
Third-party inspection is coordinated at order placement. TPI costs typically 2-4% of order value. Test witness schedules provided 7-10 days in advance.
- 5. What is the difference between slip on flanges and weld neck flanges, and which should I use?
-
Slip On Flanges:
- Pipe slides into flange bore
- Two fillet welds (inside and outside)
- Lower initial cost
- Easier installation
- Good for low to medium pressure applications
- Class 150, 300, typically up to Class 600
- Typical Qatar applications: cooling water, low-pressure process piping, utilities
Weld Neck Flanges:
- Tapered hub welded to pipe with single butt weld
- Higher initial cost
- More complex installation (beveled pipe required)
- Superior strength and fatigue resistance
- Suitable for all pressure classes
- Better stress distribution
- Preferred for high-temperature, high-pressure, or critical service
- Typical Qatar applications: LNG main process lines, high-pressure steam, critical hydrocarbon service
Selection Guidelines for Qatar:
- Use Slip On: Non-critical services, Classes 150-300, cost-sensitive projects, quick field installations
- Use Weld Neck: Critical process lines, Classes 600+, high-temperature applications (>400°C), cyclic loading, QatarEnergy specifications
- 6. Do you offer consignment inventory or stocking programs in Qatar?
-
Yes, Werner Flanges offers consignment inventory programs:
Program Benefits:- Pre-positioned stock of commonly used sizes and pressure classes
- Immediate availability for shutdowns and emergency repairs
- Reduces project lead times from 4-6 weeks to same-day delivery
- Eliminates rush freight charges
- Stock replenishment managed automatically
Typical Stocking Profile:
- Class 150 and 300 slip on flanges
- Sizes: 1/2″ through 12″
- Materials: Carbon steel A105, stainless steel F304/316L
- Raised face (RF) standard
- Quantities based on historical usage patterns
Location Options:
- Ras Laffan Industrial City
- Mesaieed Industrial Area
- Doha central warehouse
- 7. What surface treatments are available for corrosion protection?
-
Carbon Steel Flanges:
- Black oxide finish: Minimal protection, indoor use
- Oil coating: Transit/short-term protection
- Red oxide primer: General protection
- Epoxy coating: Two-coat, for coastal facilities
- Hot-dip galvanizing: Marine/desalination/offshore use
- Cold galvanizing: Alternative to hot-dip, easier for large flanges
Stainless Steel Flanges:
- Mill finish: As-machined, most applications
- Pickling & passivation: Removes contamination, enhances corrosion resistance
- Electro-polishing: Mirror finish, sanitary applications
- PTFE coating: Non-stick for chemical processing
Duplex/Super Duplex:
- Solution annealing + passivation: Standard for marine
- No coating typically required due to inherent corrosion resistance
Recommendations for Qatar:
- Doha inland: Black oxide or light oil coating
- Ras Laffan coastal: Epoxy coating or galvanizing
- Offshore platforms: Hot-dip galvanizing or super duplex material
- Desalination plants: Galvanized carbon steel or stainless steel F316L
GET A QUOTE
-
How to Request a Quote
Email: sales@wernerflanges.com
