For a ruptured potable water pipe, which patch cannot be used?

• A. EWARP
• B. Rubber patch
• C. Duct tape
• D. Plastic wrap

Answer: (A)

Patching a ruptured potable water pipe requires materials that won’t contaminate drinking water and can seal under the system’s pressure. EWARP is a water-activated patch designed for rapid leaks, but it isn’t approved for contact with potable water because the activating chemistry and materials can contaminate the water and may not meet drinking-water standards. Rubber patches with a backing plate and clamps are commonly used for potable-water leaks because, when the patch material is rated for potable water, they provide a reliable seal without introducing contaminants. Duct tape and plastic wrap are only temporary measures and are less reliable under pressure, but they don’t inherently disqualify potable-water use in every protocol. Since EWARP isn’t approved for potable water, it cannot be used for a ruptured potable water pipe.