Insights
Knowledge, sourced.
Technical and regulatory notes for owners, technical managers and port operators. General information. Human review required before treating any statement as current.
Published 2026-08-28 · Reviewed 2026-08-28
What is the IMO D-2 ballast water standard?
D-2 is the discharge performance standard under the Ballast Water Management Convention. It is a biological limit, not a product endorsement.
Published 2026-08-28 · Reviewed 2026-08-28
How does a UV ballast water management system work?
Most UV BWMS combine mechanical filtration with ultraviolet disinfection. The sequence on uptake is not the same as the sequence on discharge.
Published 2026-08-28 · Reviewed 2026-08-28
Ballast water management requirements in Australia
Australia implements ballast water management under the Biosecurity Act as well as through alignment with the IMO Convention. They are related, not identical.
Published 2026-08-28 · Reviewed 2026-08-28
What should shipowners consider when replacing a BWMS?
Replacement is an engineering and commercial problem, not a catalogue swap. The existing system, the vessel, and the remaining trading life all matter.
Published 2026-08-28 · Reviewed 2026-08-28
Ballast water retrofit: the engineering constraints that matter
An existing vessel is not a blank engine room. Retrofit starts with flow, space, power, pipe and time.
Published 2026-08-28 · Reviewed 2026-08-28
Filtration + UV versus other ballast water treatment technologies
UV and electrochlorination are the two dominant shipboard families. They solve different constraints. Neither is universally preferable.
Published 2026-08-28 · Reviewed 2026-08-28
What happens when an existing BWMS becomes unsupported?
An installed system that can no longer be maintained, documented or approved in service is an operational and biosecurity risk, not a sunk-cost argument.
Published 2026-08-28 · Reviewed 2026-08-28
Shore-based ballast water treatment for ports
Ballast water treatment does not have to end at the vessel. Ports, terminals and yards can treat ballast as infrastructure.