Inactive

Shipyards have been ineffective at estimating and bounding the preservation and structural repairs required for external hull welds. Underestimating structural repairs leads to production and contract... Shipyards have been ineffective at estimating and bounding the preservation and structural repairs required for external hull welds. Underestimating structural repairs leads to production and contractor churn, work execution delays, and unexpected costs during maintenance periods. Preservation repairs are determined based on the as-arrived paint condition, which can initially be assessed as small touch-up paint repairs or extensive coating replacements. Structural repair scope growth can have a gradual impact on an availability, since small increases to predicted scope can often be absorbed without significant impact to schedule. However, large increases to structural weld repairs can have a significant impact to cost and schedule of an availability. Visual inspections are the basis for scoping the preservation and structural evaluation scope. These visual inspections require a person to enter the space and is limited by what the inspector can see in a painted, corroded condition. It is not until the paint and corrosion are removed by abrasive blasting that the inspector can completely and accurately quantify the amount of structural repairs required. Reliance on visual inspections alone limits the ability to accurately assess current conditions and predict the future scope of work. NNL is interested in technologies that can measure the degree of metal loss through paint and loose corrosion A new or available technology that can characterize the condition of metal (i.e., metal loss) through paint and loose corrosion is requested for submission. The standard material is HY-100 base material, using HY-80 weld filler material. The ideal state for the technology would be for the inspection to be performed inboard of the hull, to support the ship being waterborne. The intent is to perform the inspection without removing paint or interferences. Update 3/29/2021: Additional attachment provided with Needs Statement from a shipyard interface. Update 4/6/22021: Updated Request for Proposal document (Rev. 1) to correct contact information for FMP-NNL-006. Keywords: NDE, Non-Destructive Examination, Inspection