Branch Fittings
Olets ASME B31.3, MSS-SP-97
ASME B16.11 Olets: Dimensions | Specifications | Material Grade | About Branch Fittings | All Product Types
Branch fittings, commonly referred to as Olets, are specialized forged fittings designed to provide branch connections from a header pipe to a smaller outlet pipe in piping systems. These fittings eliminate the need for conventional tees, reducers, and reinforcement pads, offering a more compact, efficient, and safe solution. Nutech Overseas supplies a complete range of forged branch outlet fittings, conforming to ASME B16.11, MSS-SP-97, and the ASME B31.3 Process Piping Code, ensuring compatibility with high-integrity piping systems.
Our portfolio includes all major types of branch fittings: Weldolet, Sockolet, Threadolet, Elbolet, Latrolet, Nipolet, Sweepolet, Coupolet, Brazolet, and Flangolet—each available in different end connections like butt weld, socket weld, or threaded (NPT/BSP). These fittings are engineered to support critical service applications in industries such as oil & gas, chemical processing, offshore platforms, power generation, and marine piping.
Branch outlets manufactured by Nutech are available in pressure ratings 3000#, 6000#, and 9000#, and are produced using high-grade materials like Carbon Steel ASTM A105 / A105N, Low Temp A350 LF2 CL.1/CL.2, Stainless Steel A182 F304/L, F316/L, F317L, F321, F347H, Alloy Steel F11, F22, F91, and Duplex/Super Duplex UNS S31803, S32750, S32760. These materials comply with NACE MR0175, ensuring suitability for sour service environments.
Designed to meet the rigorous requirements of ASME B31.3, our branch fittings ensure excellent weldability, pressure containment, and structural integrity. Each fitting undergoes stringent quality checks including PMI, hydro testing, and dimensional verification. With reliable performance across temperatures and pressures, our branch connections are preferred worldwide by EPC contractors, fabricators, and plant operators.
We proudly export our branch fittings to over 40 countries including USA, UAE, Germany, Italy, Saudi Arabia, Oman, and South Korea, offering both standard and custom configurations to meet project-specific demands.
ASME B31.3 Branch Outlet Fittings – Weldolet, Sockolet, Threadolet, Elbolet, Latrolet, Nipolet, Sweepolet, Brazolet, Coupolet & Flangolet
For complete technical details, including dimensions, pressure ratings, weight charts, and material specifications of our Socket Weld and Threaded Olets, please download the full Catalog PDF below.
Comprehensive Range of Forged Branch Connections in Carbon, Stainless, Alloy Steel & Duplex – Engineered for Process Piping, High-Pressure Systems, and Offshore Installations
Technical Specifications of ASME B16.11 Outlet Fittings
| Specification | Details |
|---|---|
| Product Name | Outlet Fittings / Branch Fittings / Olets |
| Standard | ASME B31.1, ASME B31.3, MSS SP-97 |
| Types Available | Weldolet, Sockolet, Threadolet, Elbolet, Latrolet, Nipolet, Sweepolet, Coupolet, Brazolet, Flangolet |
| Connection Ends | Socket Weld (SW), Threaded (NPT/BSP), Butt Weld, Flanged, Plain |
| Size Range (Run Pipe) | 1/2" to 36" |
| Size Range (Branch) | 1/4" to 12" |
| Pressure Ratings | 2000#, 3000#, 6000#, 9000# |
| Design & Manufacturing | Forged or Machined from Bar Stock/Round Bar/Forging |
| Heat Treatment | Normalized, Quenched & Tempered, Solution Annealed (depending on material) |
| Testing & Certification | 100% Pressure Tested, PMI, IGC, NACE MR0175, MTC as per EN 10204 3.1/3.2 |
| Application Industries | Oil & Gas, Construction, Ship Building, Power Plants, Petrochemical, Pharmaceutical, Water Treatment, Automobile, Chemical, Pulp & Paper |
| Origin | Made in India (by Nutech Overseas) |
| Export Network | USA, Europe, and Middle East |
Complete Material Grade Chart - ASME B16.11 Branch Fittings
| Material | Grades / Standards / UNS Numbers |
|---|---|
| Stainless Steel Olets | ASTM A182 F304 / F304L, F316 / F316L, F310, F321 / F321H, F347 / F347H, SS 904L, DIN 1.4301, 1.4306, 1.4401, 1.4404 |
| Carbon Steel Olets | ASTM A105, ASTM A106 Gr B, ASTM A234 WPB, ASTM A350 LF2 CL.1, MSS-SP-75 WPHY 42, WPHY 46, WPHY 52, WPHY 60, WPHY 65, WPHY 70 |
| Low Temperature Carbon Steel Olets | ASTM A420 WPL3, ASTM A420 WPL6 |
| Alloy Steel Olets | ASTM A182 F1, F5, F9, F11, F12, F22, F91, ASTM A234 WP1, WP5, WP9, WP11, WP22, WP91 |
| Duplex Steel Olets | ASTM A815 UNS S31803, S32205, Werkstoff No. 1.4462 |
| Super Duplex Steel Olets | ASTM A815 UNS S32750, S32760, S32950 |
| Nickel Alloys Olets | Nickel 200 (UNS N02200), Nickel 201 (UNS N02201), Inconel 600 (UNS N06600), 601 (UNS N06601), 625 (UNS N06625), 800 (UNS N08800), 825 (UNS N08825), Monel 400 (UNS N04400), Monel K500 (UNS N05500), Hastelloy C276 (UNS N10276), Hastelloy C22 (UNS N06022), Alloy 20 (UNS N08020), Nimonic 75 / 90 |
| Copper Nickel Olets | Cu-Ni 90/10 (C70600), Cu-Ni 70/30 (C71500), CuNi10Fe1Mn, CuNi30Mn1Fe |
| Titanium Olets | Grade 1, Grade 2, ASTM B381 |
| Aluminium Olets | ASTM B361, Aluminium 6061, 6082, 7075 |
| Brass Olets | ASTM B62, C23000, C26000 |
| Bronze Olets | Tin Bronze, Aluminium Bronze (C95400), Leaded Bronze (C93200), ASTM B148 |
| 254 SMO Olets | UNS S31254, ASTM A182 F44 |
Branch fittings, commonly known as Olets, are forged pipe fittings used to create a branch connection on a main pipe (called the “run pipe”) without welding a tee. These fittings are designed to provide reinforcement and smooth flow transition between the header and branch lines.
There are multiple types of branch fittings available, such as:
- Weldolet – for butt weld connections, ideal for high-pressure and high-temperature systems.
- Sockolet – used for socket weld branch connections, commonly in small-bore high-pressure piping.
- Threadolet – suitable for threaded branch connections using NPT or BSP threads.
- Elbolet – designed for branching from elbows at 90° or 45° angles.
- Latrolet – used for lateral 45° branching from the run pipe.
- Nipolet – integrates both the branch fitting and a nipple; ideal for small bore instrument connections.
- Sweepolet – contoured design provides excellent flow characteristics and high fatigue strength.
- Coupolet & Brazolet – generally used in fire protection or low-pressure systems.
- Flangolet – used when flanged connections are needed from the branch.
These forged fittings conform to ASME B31.3 Process Piping, MSS-SP-97, and are essential in critical industries such as:
- Oil & Gas transmission pipelines
- Petrochemical processing units
- Offshore & marine engineering
- High-pressure boiler piping
- Chemical and water treatment plants
By selecting the appropriate olet type, industries ensure reliable branching with reduced stress concentration and higher durability in aggressive media environments.
Forged branch fittings undergo strict quality control processes including dimensional checks, Positive Material Identification (PMI), hydrostatic testing, and Non-Destructive Testing (NDT) methods like ultrasonic and magnetic particle inspections. Mechanical tests ensure strength and durability.
Manufactured to meet standards such as ASME B16.11, ASME B31.3, and MSS-SP-97, these fittings come with certified material test reports (EN 10204 3.1/3.2). Many producers also hold ISO 9001, NACE MR0175/ISO 15156, and PED certifications, ensuring compliance with global quality and safety requirements for demanding industrial applications.
Olets are carefully packaged to protect against damage during transit and storage, ensuring they reach customers in pristine condition. Standard packaging includes:
- Wooden crates or plywood boxes for heavy or bulk shipments to prevent impact damage.
- Sealed plastic wrapping or bubble wrap around individual fittings to guard against moisture and corrosion.
- Custom cartons or pallets for smaller quantities, ensuring safe handling and ease of transportation.
For international shipping, fittings are packed following export standards that comply with customs and transportation regulations, including clear labeling with product details, batch numbers, and material certificates.
Delivery schedules are flexible, offering standard lead times for regular orders and expedited shipping options for urgent requirements. Manufacturers coordinate logistics to ensure timely dispatch to key export destinations such as the USA, Europe, Middle East, and Southeast Asia.
This careful approach to packaging and delivery helps maintain product integrity and customer satisfaction globally.
Olet fittings manufactured to stringent international standards find wide acceptance across global markets. Key export destinations include:
- United States: Serving oil and gas, petrochemical, and industrial sectors requiring high-grade forged branch fittings.
- Europe: Countries like Germany, UK, Italy, and France demand premium quality fittings compliant with EN and ASME standards.
- Middle East: Nations such as UAE, Saudi Arabia, Qatar, and Oman rely on robust fittings for their expanding oil, gas, and infrastructure projects.
- Southeast Asia: Markets in Singapore, Malaysia, Indonesia, and the Philippines utilize forged fittings for power plants, refineries, and chemical industries.
- Africa: Growing industrial sectors in South Africa, Nigeria, and Egypt require durable branch fittings for pipelines and processing units.
Premium-grade branch fittings are defined by:
- Precision Machining for accurate pipe fit-up.
- Uniform Wall Thickness to avoid weak points.
- Smooth Inner Bores to reduce flow resistance.
- Proper Markings as per MSS-SP standards.
- High-Quality Raw Materials (certified heat numbers, PMI tested).
- Compatibility with Radiography and Hydrotest.
These features ensure operational safety, compliance, and longevity.
Forged Outlet fittings can be supplied with a wide range of coatings and surface finishes depending on the application, environment, and client specifications. The most common coatings and finishes include:
- Black Oxide (Mill Finish)
Often used for carbon steel branch fittings, this finish provides mild corrosion resistance during handling and storage. It is typically used when the fittings are installed in environments where external corrosion isn’t a major concern.
- Electro-Galvanizing and Hot-Dip Galvanizing (HDG)
Zinc-coated branch fittings are ideal for outdoor or corrosive environments. HDG is preferred for higher corrosion resistance and is widely used in water pipelines, fire protection, and structural piping.
- Pickled and Passivated Finish (for Stainless Steel)
This chemical treatment removes surface impurities and enhances the corrosion resistance of stainless steel branch fittings, especially grades like 304, 316, and Duplex. It also improves the hygienic quality of fittings used in food, pharma, and chemical industries.
- PTFE, Xylan, or Epoxy Coatings
These advanced polymer coatings provide excellent resistance to acids, alkalis, and chemicals. They’re commonly applied to branch fittings used in chemical plants, offshore platforms, and marine applications.
- Shot Blasted / Sand Blasted Finish
This surface preparation method ensures the fitting is clean and ready for painting or further coating. It also enhances surface adhesion for epoxy or fusion-bonded coatings.
- Custom Coating Options
Many manufacturers also offer fusion bonded epoxy (FBE), ceramic-based coatings, or bitumen for buried pipeline applications, especially in oil and gas transmission lines.
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