What is the purpose of a patch plate in hull repairs?

• A. Locating the breach on the hull.
• B. To spread load and seal the hole when patching.
• C. To guide cutting operations.
• D. To provide decorative cover.

Answer: (B)

The patch plate is used to spread the load around a hull breach and to help seal the hole when patching. By covering the damaged area with a rigid plate, the stresses from the patch are distributed over a larger area of hull material instead of concentrating at the hole edge. This prevents the patch from pulling through and reduces the risk of further leakage, while the plate, clamped with sealant and fasteners, provides a tight, watertight backing for the repair. It’s not about locating the breach, guiding cutting, or decorative purposes.