Concerns about impact of ship repairs on the environment
Meeting on Wednesday
After concerns were raised about the impact of ship repair work at the Walvis Bay Port’s Syncrolift, a meeting has been called for Wednesday.The concerns are mainly about the dust dispersion and spray paint generated during sanding and spray painting.
A report by Geo Pollution Technologies (GPT) on the monitoring of short-term dust dispersion will be reviewed during the meeting. Findings from this study and possible solutions for improving blasting and painting operations will also be discussed.
Industry representatives, environmentalists and regulatory authorities are expected to attend the meeting to ensure that measures are implemented to mitigate the impact of these activities on the surrounding environment and community.
Study
Stakeholders will also look at various mitigation methods contained in the study.
According to the assessment report, abrasive blasting – commonly used to remove marine growth and old paint from ship hulls – can generate large amounts of dust.
Residents and businesses are concerned about the location of the operations and the dispersion of dust, which could have a negative impact on the surrounding environment.
According to the report, GPT’s study was conducted in different weather conditions, as wind speed and direction play a major role in how dust and paint particles disperse.
Three blasting methods were identified as potentially viable solutions to mitigate the impact on surrounding areas.
Additional containment strategies – such as fully enclosed baskets and nets – were also considered, but deemed impractical.
According to the study, the dispersion of dust is exacerbated when blasting tips are directed upwards rather than downwards.
“Spray paint can travel up to 100 metres from the site,” the study found.
Recommendations
Based on the analysis, GPT made several recommendations to reduce environmental and health impacts.
“Blasting should not be carried out when wind speeds exceed 40 km/h and operations should be carried out in calmer conditions as much as possible.”
In addition, the site should be cleaned regularly to prevent dust accumulation that can be created and blown away by wind.
Other steps that could be considered include the use of a method called vapour blasting. This has been identified as the most effective method for dust reduction.
This method reduces airborne particles more than traditional dry grit blasting.
“To counteract the influence of prevailing south-southwesterly winds, the installation of windbreaks is recommended. These structures can help reduce wind speeds and mitigate turbulent air flows.”
The study further shows that additional protective measures should also be considered, especially in areas with stronger wind conditions. - [email protected]