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Technical Features and Specifications
The base of an O-let is forged with a specific curvature to match the outside diameter of the header pipe.
| Type | Function |
|---|---|
| Weldolet | Butt-weld branch for high-stress applications. |
| Sockolet | Socket-weld branch for smaller diameter pipes. |
| Thredolet | Threaded branch for instrument connections. |
| Latrolet | 45-degree branch for specific flow requirements. |
These fittings are forged to ASME B16.9 and MSS SP-97 standards. The "integral reinforcement" provided by the forged body compensates for the hole cut in the header pipe, eliminating the need for additional reinforcing pads (re-pads) and significantly reducing welding time and inspection costs.
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Buying Tips for Branch Connections
- Header vs. Branch Size: You must specify both the run pipe size and the branch pipe size (e.g., 10" x 2") to ensure the curvature of the O-let matches the pipe.
- Bevel Preparation: For Weldolets, ensure the bevel is machined to the correct angle (usually 37.5 degrees) for consistent penetration during welding.
- Material Matching: The O-let should always match the material grade of the header pipe to avoid galvanic corrosion and welding compatibility issues.
Advantages of Forged O-lets
| Advantage | Operational Benefit |
|---|---|
| Reduced Welding | Requires much less weld metal than a traditional forged tee. |
| Stress Distribution | Forged shape prevents cracks at the pipe-branch junction. |
| Compact Design | Ideal for dense piping manifolds on offshore platforms. |
Primary Applications
| Application | Usage Context |
|---|---|
| Refineries | Adding sensor points or bypass lines to existing headers. |
| Power Plants | Drain and vent connections on high-pressure steam lines. |
| Natural Gas | Connection points for pressure gauges and transmitters. |
- Q: When should I use a Weldolet instead of a Tee?
- A: Use a Weldolet when you need a branch connection on an existing pipe or when the branch size is significantly smaller than the header size, as it is more economical and efficient.
