Not all warning tapes are created equal. Depending on the project requirements and the type of utility being protected, construction companies must choose the type of warning tape that best fits their needs.
Nondetectable warning tape
This is the industry standard for marking utilities that are easy to find or when budget is a primary constraint.
- Durability: Usually manufactured from high-quality polyethylene or polyester, these tapes are designed to survive the harsh underground environment. They must resist moisture, ultraviolet rays (during the installation phase) and the corrosive chemicals often found in various soil types.
- Visibility: Their high-contrast, bright colors ensure they’re immediately recognizable even when covered in dirt.
- Cost-effectiveness: Because they lack metallic components, they’re the more economical choice for large-scale projects where “dig-safe” protocols are already in place.
Detectable warning tape
For nonmetallic pipes – such as PVC water lines or fiber optic conduits – nondetectable tape isn’t enough because standard locators can’t “see” the utility from the surface.
- Metallic core: Detectable tape is embedded with metal that makes the tape detectable with specialized equipment.
- Surface detection: This allows crews to locate the exact path of the utility using specialized electromagnetic equipment before the first shovel hits the ground. It bridges the gap between digital plans and the physical reality of the site.
- Detectable warning tape might be a better choice for utility lines that run through large, vacant spaces. Marking for future projects becomes easier that way.
- Visibility: Detectable warning tape still comes in vibrant colors with clear text, allowing for visual detection.
The APWA color-coding system: a universal language
In the heat of a busy construction shift, there’s no time for guesswork. To ensure safety across borders and industries, the American Public Works Association established a standardized color-coding system. Following this code isn’t just a best practice; it’s often a legal requirement.
By adhering to this spectrum, planners ensure that any subcontractor or utility worker onsite understands exactly what lies beneath the soil the moment the tape is unearthed. For example, seeing red tape immediately signals a high-risk electrical hazard, while green alerts the team to the presence of sewage infrastructure. Knowing the particular hazard allows the construction team to take the necessary precautions.
Conclusion
Underground warning tape is a low-cost investment that yields high-value protection. By choosing the correct material – whether it’s the rugged durability of nondetectable tape or the advanced tracing capabilities of detectable versions – and strictly adhering to APWA color standards, construction planners can significantly mitigate risk. In an industry where “hidden” variables cause the most trouble, warning tape brings much-needed clarity to the subsurface.
McCraren Compliance offers many opportunities in safety training to help circumvent accidents. Please take a moment to visit our calendar of classes to see what we can do to help your safety measures from training to consulting.
Original article published by Safety+Health an NSC publication