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Blast Cleaning of Ship Steelusing Re-cycled Glass
Professor George Bruce
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Content
Background
Blast Cleaning Media
Legislation & Standards
Project Blasting Trials
Results
Conclusions
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Background
The Importance of Blast Cleaning
Control by Shipyard
Shipowner Coating Company
Critical in good Coating of Steel
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Project Objectives
Testing of Re-cycled Glass Materials (RGM)
Blasting Capability Productivity
Surface Condition Cost Comparison
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Blasting Media
Natural minerals - silica sand, garnet,olivine
Manufactured media - steel shot, glass
grit, alumina, plastic pellets or beads, solidcarbon dioxide, sodium bicarbonate
Mineral slag - copper slag, nickel slag,
iron slag and coal slag
Organic media - corn cobs, nut shells,
starch grains
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Ship Blasting Media
Sand Health and Safety Hazard
Grit Copper Slag, Disposal Costs
Steel Shot Expensive, Closed System
Garnet High Quality but Expensive
UHP Water Lower capability
RGM To be tested
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UK Legislation
Landfill Tax will double disposal costs
EU Packaging Directive Glass Recycling
Kyoto Summit Emissions Reduction
Statutory Re-cycling Targets
Trying to anticipate future legislation
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Working Standards
Steel Surface Finish to SA 2.5 Standard
Depends on initial sub-strate
50-75 microns ideal for coating
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Previous Results
For Epoxy coating:
Glass abrasive cleaned - 11.6 m2/hr
Copper Slag cleaned 9.5 m2/hr
Nickel Slag cleaned 8.0 m2/hr
Glass abrasive consumed 40.9 kg/m2
Copper Slag consumed 76.7 kg/m2
Nickel Slag consumed 74.3 kg/m2
7/31/2019 Blast Cleaninng of Steel Ships Using Recycled Glass
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Potential Benefits of Glass
Inert Material
No Heavy Metals (unlike Copper Slag)
No Salts Reduced Corrosion
No Free Silica
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Project Blasting Trials
Initial Trials
Small Samples in Controlled Conditions
Establishing Baseline Comparisons
Initial Shipyard Trials
Small Samples in Shipyard Conditions
Establishing Media Capability in Shipyards Full Scale Trials
Blasting Marine Structures
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Initial Controlled Trials
Tests on Steel Plates
Some Pipes
Beams and other Structural Sections
Established the capability of RGM
Similar Performance to Grit
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Initial Shipyard Trials
Various Steel Plates from Ships
RGM Compared to UHP
RGM used wet as well as dry
Compared in 2nd Shipyard to Copper Slag
Samples blasted, inspected and coated
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Plates prior to Blasting
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RGM Closeup
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RGM Blasting of Samples
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Steel Samples after Blasting
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Full Scale Shipyard Trials
Mooring Barge
Heavily Corroded Comparison between RGM and UHP
Mooring Pontoon
Heavily Coated
Comparison between RGM and Copper Slag
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Mooring Pontoon before Blasting
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Mooring Barge before Blasting
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Shipyard Trial Results (1)
Abrasive Dry RGM Wet RGM Wet RGM UHPSize (mm) 0.75-1.5 0.75-1.5 0.75-1.5 N/A
Surface
cleanliness
SA 2.5 SA 2.5 SA 2.5 SA 2.5
Roughnessm
2233 2207 2207 Could notbe measured
Dust 2 1 1 1
Productivity
(m/h)
4.19 1.62 4.63 5.15
Specific GritConsumption
(kg/m)
19.33 115.74 42.74 186.48 lWater
Table 1. Shipyard 1 Full Scale Trials with different media
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Blasted Mooring Barge
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Shipyard Trial Results (2)
Abrasive Dry RGM Dry RGM Copper Slag Copper SlagSize (mm) 0.75 1.5 0.75 1.5 1.4 2.5 1.4 2.5
Surface
cleanliness
SA 2.5 SA 2.5 SA 2.5 SA 2.5
Roughness
m
95 2415 202 2396
Dust 3 2 3 2
Productivity(m/h)
12.649 12.43 10.89 12.87
Specific GritConsumption
(kg/m)
45.21 46.02 35.11 29.72
Table 2. Shipyard 2 Full scale trials with different media
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RGM Blasting of Pontoon
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Pontoon after Blasting
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Full Scale Shipyard Trials
Comments
RGM showed a steep learning curve
Wet RGM was not very successful RGM gave improved appearance
RGM is a Capable Process
Further Monitoring is in Progress
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Conclusions
RGM Performance is Comparable to Other
Media RGM is Equally Capable of Surface
Preparation for Coating
RGM has similar productivity to UHP
Supplies of RGM at acceptable cost are
essential
Further work on disposal is required
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Q & A
George Bruce