Introduction
MarineWiki is our ambitious initiative to aggregate the extensive know how of our network of professionals in the Marine Industry. This encyclopedia of the Marine Industry will serve as a reference for students as well as practicing professionals.
Synopsis
An attempt has been made to cover all the aspects of Naval architecture, Marine Engineering, and Shipping in this site through various sub-sections.
- TIME LINE - a detailed account of the history of ships and shipping
- SHIPPING - a description of shipping industry
- SHIPS - all the kinds of ships and vessels are described
- SHIP DESIGN - a detailed description of the design of various types of ships
- SHIP CONSTRUCTION - a detailed description of the construction of ships from scratch
- SHIP REPAIR - description of ship repair after delivery in drydock as well as out of it
- SHIP CONVERSION - describes various conversion process
- OFFSHORE - the industry and its description
- INSPECTIONS - our experiences as an owners representative at new shipbuilding projects
- DESIGN NOTES - our experiences in designing
- GENERAL INFO - Information about the marine industry
- RULES & REGULATIONS - provides an explanation and the logic behind the rules. Application of the rules is mentioned in the DESIGN NOTES
- PROJECTS - a list of interesting projects pursued by Team MarineWiki
- GREATS - to facilitate all aspiring Naval Architects and Marine engineers to get inspiration, this section contains the biography of some leading lights
One last word. If you feel that you have benefited from the information provided, please make sure that you share some of your knowledge to others through this site.
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March 2011
Today's featured article
Pre-erection Joint Final DFT Inspection
Introduction
To protect from corrosion & enhance the lifetime of a substrate, coating or painting is carried out.
The needs include:
- For Asthetic Appearance.
- To enhance the lifetime , by safeguarding from Corrosion & Erosion Environment.
- To act as a Insulation Medium.
- To impart properties like Abrasion Resistance, Temperature Resistance, Thermal Resistance , Chemical Resistance, etc….. based on the Requirement.
Check Points
- Surface Preparation Should meet the standard. (more than 90% of painting failures occurs due to poor surface preparation )
- Ensure the Surface is free from Moisture, Oil, Grease, Dust, Rust, Other Contaminants, etc…..
- Ensure the salt contamination level maintained within the standard Allowable limit.
- Record the Ambient conditions throughout the Paint application process & ensure it does not exceed the standard limit.
- Paint Application should be strictly practised as per manufacturer recommendations.
- Check for Compressed Air Quality free from Moisture, oil,etc… before starting Painting.
Procedure
- Before Inspection, check the calibration certificates of DFT Gauge, Hygrometer,Surface Temperature Thermometer,etc.
- Overall Visual inspection to be carried out .
- Check for common painting defects like Runs, Dust contamination,Wrinkling,Blistering,Blushing, Cracks, Peel Off, etc.
- Check for additional stripe coat application over the welded beads.
- Cross verify the records maintained for coating interval time, DFT readings for individual coats, Ambient conditions, Mixing ratio, Thinner, etc.
- Start checking the DFT as required by Specification. (Usually SSPC PA2 Standard)
- After inspection, openly discuss the problems noticed with the concerned.
| SSPC PA2
|
| Area | Spot Measurement
|
| ~30 sq.m
| 5 Spots/ each 10 sq.m
|
| ~100 sq.m
| Each 5 spots/ Randomly selected three 10 sq.m
|
Acceptance Criteria
- No single spot ( avg of 3 gauge readings) shall be less than 80% of the specified dry film thickness.
- Discard any unusually high or low gauge reading that cannot be repeated consistently & take the avearge of acceptable gauge reading as the spot measurement.
Conclusion
- If the Final condition is found ok , job to be accepted.
- If the Final condition not ok, job to be Rectified & Reoffered.
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