Ductile iron pipe can be installed using horizontal directional drilling (HDD) or directional boring, a trenchless method, but requires careful planning and the use of flexible restrained joints to accommodate the pulling forces and deflections during installation.
Here’s a more detailed explanation:
- Suitable for HDD: Ductile iron pipe is a viable option for HDD applications, offering advantages like ruggedness, durability, and dependability.
- Trenchless Method: HDD is a trenchless method, meaning it avoids the need for traditional open-cut excavation, reducing disruption and costs.
- Flexible Restrained Joints: For successful HDD installations with ductile iron pipe, flexible restrained joints are crucial.
- Joint Deflection: These joints allow for significant deflections during installation, but the allowable deflection should be within the manufacturer's specifications.
- Pulling Forces: The joints must be able to withstand the significant pulling forces generated during HDD.
- Joints to Avoid: Gripping push-on joint gaskets that utilize stainless-steel teeth locking segments are not recommended for HDD installations.
- Design Considerations: The drill path should be designed to minimize friction and stay within the allowable joint deflection and curve radius for the pipe.
- Benefits of HDD: HDD offers benefits over traditional open-cut construction, such as reduced social and economic impact, and faster installation times.
- DIPRA Resources: The Ductile Iron Pipe Research Association (DIPRA) provides technical resources and design steps for planning and designing trenchless applications, including HDD.
- Example Projects: There are examples of successful HDD projects using ductile iron pipe, including a 32-mile pipeline project in Mississippi.
- Other Pipe Options: While ductile iron pipe is a good option, polyethylene pipe is also a common choice for water line HDD applications.
Trenchless Drilling has completed several projecs within Miami Dade, Broward and Ft. Lauderdale. We’ve also completed a few projects in Georgia and Alabama. Feel free to contact us to learn more or get a free quote.