Flanges
Flanges
OM Tubes manufactures a full range of stainless steel flanges engineered for strength, pressure integrity, and compatibility across ASME, EN, and API piping systems. With precision-machined faces, heat code traceability, and 3.1-certified MTCs, our flanges deliver reliability in refineries, chemical plants, offshore platforms, and clean energy projects.
Weld Neck Flanges (WN)
High-pressure, fatigue-resistant flanges for critical systems.
- Sizes: 1/2" to 48"
- Rating: Class 150 to 2500
- Specs: ASME B16.5 / B16.47 / EN 1092-1 Type 11
- Faces: Raised Face (RF), Ring Type Joint (RTJ), Flat Face (FF)
- Application: Refineries, high-temperature steam, oil & gas separators, UT & RT available, 3.1 or 3.2 MTC on request, In Stock up to 24"
Blind Flanges (BL)
For positive isolation, hydrotesting, and future system expansion.
- Sizes: 1/2" to 60"
- Ratings: 150 – 2500 Class
- Specs: ASME B16.5 / B16.47 Series A/B
- Custom Bored or Tapped Faces available
- Applications: Block ends, inspection closures, pressure shutdowns, Impact tested for low-temp, RTJ ready, Available in stock & custom-drilled
Slip-On Flanges (SO)
Reduce fitting or port size using internal-to-external thread transition.
- Sizes: 1/2" to 36"
- Ratings: 150 – 900 Class
- Specs: B16.5, B16.47, ISO 7005
- Applications: Utility piping, water lines, low-cycle connections, Face serration per MSS-SP-6; PMI available
Socket Weld Flanges (SW)
Ideal for small-bore piping with strong fatigue resistance.
- Sizes: 1/2" to 2"
- Ratings: Class 150 to 600
- Specs: ASME B16.5 / MSS-SP-79
- Applications: Lube oil lines, pressure skids, condensate service, Socket bore tolerance to ANSI B16.5
Lap Joint Flanges (LJ)
Four-way connectors for high-density routing and intersecting flows.
- Sizes: 1/2" to 24"
- Ratings: Class 150 to 900
- Specs: ASME B16.5 / MSS-SP-44
- Applications: Systems requiring frequent maintenance or alignment, Available in SS, CS with SS stub end options
Threaded Flanges
For easy, no-weld pipe connection – common in low-pressure lines.
- Sizes: 1/2" to 4"
- Ratings: Class 150 to 600
- Specs: ASME B16.5, BS 4504
- Applications: Utility water, air, oil drain connections, 100% thread-gauged; stock available in NPT/BSP
Orifice Flanges
Designed for pressure drop measurement and flow metering systems.
- Sizes: 1/2" to 24"
- Ratings: Class 150 – 2500
- Specs: ASME B16.36
- Comes With: Tappings, jack screws, and optional orifice plate
- Applications: Differential pressure metering, steam monitoring, Supplied with NACE-compliant hardware kits on request
Flange Type Quick Comparison
| Flange Type | Pressure Class | Welded? | Dismountable? | Typical Use Case |
|---|---|---|---|---|
| Weld Neck (WN) | 150–2500 | Yes | No | High-temp & high-pressure lines |
| Blind (BL) | 150–2500 | No | Yes | System shutdown or hydro testing |
| Slip-On (SO) | 150–900 | Yes | No | Utility & water lines |
| Socket Weld (SW) | 150–600 | Yes | No | Small-bore lines, Lube oil systems |
| Lap Joint (LJ) | 150–900 | No | Yes | Systems needing frequent removal |
| Threaded | 150–600 | No | Yes | Low-pressure air/water/oil |
| Orifice | 150–2500 | Yes | No | Flow metering and DP measurement |