What is the purpose of testing a patch for leaks by checking seams for integrity?

• A. To test patch flexibility.
• B. To ensure there are no leaks at seams.
• C. To measure thickness.
• D. To check patch color.

Answer: (B)

Verifying a patch by checking seams focuses on making sure the joint between the patch and the surrounding surface is watertight. Seams are common failure points where bond, sealant, or welds can fail, so confirming their integrity ensures fluids won’t seep in or out at the boundary under service conditions. When the seams pass this check, the patch has a proper seal around its edges, preventing leaks along the boundary. Leaks often start at a seam because two surfaces meet and movement or imperfect bonding can create gaps. Cosmetic factors like color or simply measuring thickness don’t indicate whether a leak will occur; the crucial concern is the ability of the seam to hold under pressure and stress. In practice, this test may involve a visual inspection plus a pressure or leak test to confirm no passage along the seam.