DNV DNV-RP-C301 [ Active ]

Objective and scope

The main objectives of this recommended practice (RP) are to:

— provide an accepted industry practice for using bonded repair

— serve as a technical reference document in contractual matters.

This RP provides:

— An assessment and decision making process on whether to proceed with a bonded patch repair.

— A design and qualification process to design and fabricate bonded patches.

The scope of this RP covers design, materials, structural analysis, fabrication, testing, in-service inspection and maintenance of bonded repairs. Aspects relating to documentation, verification and quality control are also addressed.

Guidance note:

A repair might be rehabilitation of fatigue cracks in a structural element or bridging of cracks in corroded (structural or nonstructural) tank plating.

Furthermore, this technology could be used for modification or upgrading by reinforcing structural elements to provided added capacity.

The repair procedures covered by this RP utilizes patches of composite material, steel or other structural materials that are bonded to an existing steel structure.

The principle of a bonded repair is shown in Figure 1-1. The original structure was designed for certain loads. A fatigue or corrosion damage reduces its capability and the structure needs repair. Instead of welding, a patch will be applied to restore the integrity of the structure.