Which patch is used for a pinhole leak in a straight fire main?

• A. Soft pipe patch
• B. Box patch
• C. Duct tape patch
• D. Clamp patch

Answer: (A)

For a small pinhole leak on a straight fire main, the best temporary repair is a soft patch. Its flexible rubber or patch material can conform to the curved surface of the pipe and be pressed directly over the hole, then secured with a backing plate and hose clamps or bands. This creates a quick, reliable seal that accommodates the pipe’s shape and pressurization, letting the crew hold pressure while arranging a permanent fix.

A box patch, being a rigid metal plate, is more suited to larger holes or flatter surfaces and requires more time and preparation. Duct tape is not dependable under pressure and isn’t a standard choice for fire mains. A clamp patch, while useful in some scenarios, involves a heavier assembly and is typically applied for different leak conditions or larger breaches. For a tiny, pressurized leak, the soft patch offers the fastest, most effective temporary seal.