MSS SP-97 Integrally Reinforced Branch Outlets
MSS SP-97 Olet Fittings : Specifications | Materials | Dimensions | Weight Chart | Tolerances | FAQ
MSS SP-97 Integrally Reinforced Branch Outlets – Heavy-Duty Olets for Reliable Piping Connections – Weldolet, Threadolet, Sweepolet & Sockolet – Sizes ½” to 24” – Exported Worldwide to USA, Qatar, South Africa, Indonesia & Poland.
Best Export Prices: sales@midlandforgefittings.com
We are more than just a supplier—we are a trusted partner in the piping and forging industry. We are manufacturers and suppliers of MSS SP-97 Integrally Reinforced Branch Outlets, offering precision-engineered solutions for critical piping systems. With advanced manufacturing, engineering expertise, and customer-first values, we deliver products that meet global standards while ensuring quality, reliability, and innovation.
Our streamlined operations focus on premium raw materials, state-of-the-art forging, and strict quality testing to guarantee performance in demanding environments. Through continuous improvement and attention to detail, we efficiently meet both bulk and customized requirements with consistency and trust.
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MSS SP-97 Integrally Reinforced Branch Outlets are specialized branch connection fittings designed to provide a strong and leak-proof reinforcement at the point of connection between a run pipe and branch pipe. These outlets eliminate the need for traditional reinforcement pads or saddles by incorporating integral reinforcement into the fitting itself, ensuring superior strength and structural integrity. Available in multiple configurations such as Weldolet, Sockolet, Threadolet, Latrolet, Nipolet, Elbolet, Sweepolet, and more, these fittings are manufactured to withstand high-pressure, high-temperature, and corrosive service conditions. They are suitable for use across a wide range of industries, including petrochemical, power generation, oil & gas, and process piping systems.
MSS SP-97 branch outlets are produced in forged, wrought, or fabricated construction, ensuring compliance with global standards for dimensional accuracy, mechanical strength, and metallurgical integrity. They are available in pressure classes up to 9000#, and in a size range typically from ½” to 36” depending on type. By reducing stress concentration at the weld joint, these fittings significantly enhance the fatigue resistance and service life of piping systems. Their compact design allows for simplified installation, better flow characteristics, and compatibility with a wide variety of piping materials including carbon steel, alloy steel, stainless steel, and high-nickel alloys.
MSS SP-97 Integrally Reinforced Branch Outlets - Specifications
Branch Outlets
| Material Type | Grades / Standards | Notes |
|---|---|---|
| Carbon Steel | ASTM A105, A350 LF2, A234 WPB | Suitable for high-pressure applications |
| Alloy Steel | ASTM A182 F11, F22, F91 | High-temperature and corrosion-resistant |
| Stainless Steel | ASTM A182 F304/304L, F316/316L, F321, F347 | Corrosion-resistant, widely used in industry |
| Nickel Alloys | Inconel, Incoloy, Monel, Hastelloy | High temperature & corrosive environments |
| Duplex / Super Duplex | UNS S31803, S32750 | Excellent corrosion resistance & strength |
Branch connection fittings MSS SP-97 – Dimensions
| Outlet Type | Run Pipe Size, (NPS) |
Branch Pipe Size (NPS) |
Schedule / Wall Thickness |
End Connection | Max Pressure Class / Notes |
|---|---|---|---|---|---|
| Weldolet / Sweepolet |
2” – 48” | ½” – 24” | Sch 10s – XXS | Butt Weld / Socket Weld |
Integral reinforcement, high-pressure service |
| Sockolet | 2” – 36” | ½” – 4” | Sch 10s – Sch 160 | Socket Weld / Threaded (NPT/BSPT) |
Compact design, easy installation |
| Threadolet | 2” – 36” | ½” – 4” | Sch 10s – Sch 160 | Threaded (NPT/BSPT) |
For threaded branch connections |
| Nipolet | 2” – 36” | ½” – 4” | Sch 10s – Sch 160 | Butt Weld / Threaded |
High-pressure or corrosive service |
| Elbolet / Latrolet |
2” – 36” | ½” – 12” | Sch 10s – XXS | Butt Weld | For angled or side branch connections |
| Coupolet / Insert Weldolet |
2” – 36” | ½” – 12” | Sch 10s – XXS | Butt Weld / Socket Weld |
Specialty branch connections, integral reinforcement |
Reinforced pipe branch fittings - Weight Chart
| Outlet Type | Run Pipe Size (NPS) | Branch Pipe Size (NPS) | Schedule / Wall | Weight (kg) |
|---|---|---|---|---|
| Weldolet | 2” | ½” | Sch 40 | 1.2 |
| 2” | 1” | Sch 40 | 1.8 | |
| 6” | 2” | Sch 80 | 7.5 | |
| 12” | 4” | Sch 160 | 28 | |
| 24” | 6” | Sch XXS | 65 | |
| Sockolet | 2” | ½” | Sch 40 | 0.9 |
| 6” | 1” | Sch 80 | 5.0 | |
| Threadolet | 2” | ½” | Sch 40 | 0.8 |
| 4” | 1” | Sch 80 | 3.2 | |
| Nipolet | 2” | ½” | Sch 40 | 0.9 |
| 6” | 2” | Sch 80 | 6.5 | |
| Elbolet / Latrolet | 2” | ½” | Sch 40 | 1.0 |
| 8” | 3” | Sch 80 | 12 | |
| Coupolet / Insert Weldolet | 6” | 2” | Sch 80 | 6.8 |
| 12” | 4” | Sch 160 | 30 |
MSS SP-97 – Branch Outlets Dimensional Tolerances
| Parameter | Tolerance / Standard | Notes |
|---|---|---|
| Run Pipe Outer Diameter (OD) | ±1% of nominal OD | Applies to all outlet types |
| Branch Pipe Outer Diameter (OD) | ±1% of nominal OD | Ensures proper fit for branch connection |
| Wall Thickness | +12.5% / -0% | Guarantees minimum pressure rating |
| Out-of-Roundness (OD / ID) | ≤1% of nominal OD | Prevents misalignment during welding |
| Face to Center Distance (L1) | ±2 mm | Distance from branch face to pipe center |
| Branch End Length (L2) | ±2 mm | Applies to weld or threaded ends |
| Branch Angle | ±1° | For angled outlets (Latrolet, Elbolet) |
| Threaded Connections | As per ASME B1.20.1 | For Threadolet or Nipolet |
| Socket Weld Connections | As per ASME B16.11 | For Sockolet or similar |
What are MSS SP-97 Integrally Reinforced Branch Outlets?
- MSS SP-97 branch outlets, also known as olets, are specialized branch fittings designed to create a strong connection between a run pipe and a branch pipe.
- They incorporate integral reinforcement, eliminating the need for external pads or reinforcement.
- This design provides:
- Uniform stress distribution at the branch weld joint
- Leak-proof performance under high pressure and temperature
- Reduced installation time due to compact and standardized dimensions
- Common types include: Weldolet, Sockolet, Threadolet, Nipolet, Latrolet, Elbolet, Sweepolet, Coupolet, and Insert Weldolet.
What are the main benefits of using integrally reinforced branch outlets?
- Eliminates need for external reinforcement pads, reducing cost and welding
- Compact design allows installation in tight spaces
- Reduces stress concentration, improving fatigue resistance
- Handles high cyclic pressures in industrial piping
- Compatible with various materials: carbon steel, stainless steel, alloys, duplex
- Ensures leak-proof, safe branch connections in critical pipelines
How to select the correct MSS SP-97 outlet for a piping system?
- Identify run pipe size and branch pipe size
- Determine outlet type based on connection method (welded, threaded, socket)
- Choose material according to pressure, temperature, and media compatibility
- Verify pressure class and wall thickness
- Ensure dimensional tolerances match the piping design
- Confirm compliance with MSS SP-97, ASME B16.9/B16.11, and API standards