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Intervention Engineering IWS Methodology

Sarolta Pudney
Sarolta Pudney

The document discusses ROV inspection methods for various hull components including: - The hull shell plating can be inspected via free flying for an overview or attached to the hull for better video quality but limited field of view. High definition video and lighting is used to assess marine growth and coatings. - ICCP anodes and zinc reference cells on cathodic protection systems can be visually inspected for damage and high pressure water used to clean them. - Sea chests can be inspected using high definition cameras through gratings to assess coatings, marine growth, and anodes, with cleaning used to remove marine growth. - Overboard discharges can be inspected externally and internally using various cameras and a

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INSPECTION ROV SPECIALISTS HULL General Visual Inspection (GVI) of the hull shell plating can be conducted using either of these two methods: Free flying gives a general overview of plating condition and allows for marine growth assessment. Using this method, a better field of view is achieved however movement in the video is evident. Attached to the hull (via crawler attachment) this approach ensures better video quality due to perfectly still and stable platform; however, field of view is limited due to proximity to hull (leading to an increased number of passes). Lossless 1080p HD video and effective lighting that tracks the camera provides the required detail for visual inspection, marine growth and coating assessment. Hull plating inspection routes are to be outlined in the Inspection Plan submitted to the Class Society for approval.
INSPECTION ROV SPECIALISTS Cathodic Protection System ICCP Anodes and zinc reference cells can be visually inspected for any indications of damage. High pressure water cleaning can also be conducted to reveal the anodes/reference cells.
INSPECTION ROV SPECIALISTS Sea Chests Intervention Engineering can collect high quality footage through the gratings for coating condition, marine growth and anode assessment using the 1080p HD cameras. High pressure water cleaning may be required to remove marine growth from sea chest gratings to allow for higher water flow and enable internal inspection through the gratings.
INSPECTION ROV SPECIALISTS Overboard Discharges Overboard discharges can be inspected using SD or HD cameras. Using the HD camera externally on a free flying ROV enables a rapid overview of the overboard outlet and its surroundings. Some components of the internal valve are normally visible. By using the crawler skid, the added stability enables high quality CVI of the penetration including welds. Intervention Engineering can also utilise a self-illuminated PTZ camera on a pole that is sent into the overboard, allowing detailed CVI of larger diameter oveboards (>200mm). For smaller overboards a Micro Endoscopic Camera (10.9mm OD) with inbuilt lights on 10m lead allows for internal inspection. This camera can also travel through the distance piece and inspect the valve condition. If overboard labels are covered by marine growth, high pressure water or brushes can be used to clean the identification mark.
INSPECTION ROV SPECIALISTS Propeller The propeller is normally inspected with the ROV in a free-flying mode. All propeller blade leading and trailing edges, rope guard, propeller boss and nut cap are inspected closely and condition is noted. Cleaning can be completed using high pressure water. The crawler can be utilised to provide a stable platform for cleaning and close visual inspection. Photogrammetry can be used to model and size potential defects.
INSPECTION ROV SPECIALISTS Rudder The rudder and rudder horn can be inspected and spot cleaning can be conducted on identified areas of interest. Water cleaning is normally required to clean in crevices around rudder horn. Intervention Engineering have previously completed a fully diverless in-water survey on a vessel with an in-service rudder. The governing Class Society (ABS) were satisfied with the data collected and did not require additional diver inspection on the rudder.

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Intervention Engineering IWS Methodology

  • 1. INSPECTION ROV SPECIALISTS HULL General Visual Inspection (GVI) of the hull shell plating can be conducted using either of these two methods: Free flying gives a general overview of plating condition and allows for marine growth assessment. Using this method, a better field of view is achieved however movement in the video is evident. Attached to the hull (via crawler attachment) this approach ensures better video quality due to perfectly still and stable platform; however, field of view is limited due to proximity to hull (leading to an increased number of passes). Lossless 1080p HD video and effective lighting that tracks the camera provides the required detail for visual inspection, marine growth and coating assessment. Hull plating inspection routes are to be outlined in the Inspection Plan submitted to the Class Society for approval.
  • 2. INSPECTION ROV SPECIALISTS Cathodic Protection System ICCP Anodes and zinc reference cells can be visually inspected for any indications of damage. High pressure water cleaning can also be conducted to reveal the anodes/reference cells.
  • 3. INSPECTION ROV SPECIALISTS Sea Chests Intervention Engineering can collect high quality footage through the gratings for coating condition, marine growth and anode assessment using the 1080p HD cameras. High pressure water cleaning may be required to remove marine growth from sea chest gratings to allow for higher water flow and enable internal inspection through the gratings.
  • 4. INSPECTION ROV SPECIALISTS Overboard Discharges Overboard discharges can be inspected using SD or HD cameras. Using the HD camera externally on a free flying ROV enables a rapid overview of the overboard outlet and its surroundings. Some components of the internal valve are normally visible. By using the crawler skid, the added stability enables high quality CVI of the penetration including welds. Intervention Engineering can also utilise a self-illuminated PTZ camera on a pole that is sent into the overboard, allowing detailed CVI of larger diameter oveboards (>200mm). For smaller overboards a Micro Endoscopic Camera (10.9mm OD) with inbuilt lights on 10m lead allows for internal inspection. This camera can also travel through the distance piece and inspect the valve condition. If overboard labels are covered by marine growth, high pressure water or brushes can be used to clean the identification mark.
  • 5. INSPECTION ROV SPECIALISTS Propeller The propeller is normally inspected with the ROV in a free-flying mode. All propeller blade leading and trailing edges, rope guard, propeller boss and nut cap are inspected closely and condition is noted. Cleaning can be completed using high pressure water. The crawler can be utilised to provide a stable platform for cleaning and close visual inspection. Photogrammetry can be used to model and size potential defects.
  • 6. INSPECTION ROV SPECIALISTS Rudder The rudder and rudder horn can be inspected and spot cleaning can be conducted on identified areas of interest. Water cleaning is normally required to clean in crevices around rudder horn. Intervention Engineering have previously completed a fully diverless in-water survey on a vessel with an in-service rudder. The governing Class Society (ABS) were satisfied with the data collected and did not require additional diver inspection on the rudder.