Legionella on ships – How to ensure crew safety

Jun 28, 2021
A legionella outbreak on board a ship can be disastrous because visa restrictions may prevent emergency aid. The most efficient way to prevent this is to install a water disinfection system that eliminates the chance of legionella bacteria growing
A legionella outbreak on board a ship can be disastrous because visa restrictions may prevent emergency aid. The most efficient way to prevent this is to install a water disinfection system that eliminates the chance of legionella bacteria growing

What is legionella? 

Legionella is a bacterium that is always available in any source of water. The bacteria spread through small droplets which can be ingested by people nearby the water, for instance when taking a shower. Consequently, they can contract Legionnaires’ disease or Pontiac fever. Compared to COVID-19 for instance, the mortality rate for Legionnaires’ disease is way higher. 10% of healthy people die and the rate increases for the elderly and people with underlying diseases. 


How does legionella grow? 

In temperatures below 15 degrees and beyond 65 degrees, Legionella will not be able to multiply. In the quest to do cost-saving installations, cold and hot water pipes are always laid quite close to each other. Thus, the hot water pipes tend to warm up cold water pipes. Even though hot water pipes are beyond 65 degrees, the cold-water pipes might be warmed up enough to create suitable conditions for Legionella to grow. It is therefore quite common to find legionella in cold water pipes even though the cold water most of the time is colder than 15 degrees. 


What problems can it cause? 

Some long-distance routes like Bulk-carriers carrying iron-ore from Brazil to China may have 30 days at sea. Many crew are of Philippino and Indian descents and they require Visa in order to get onshore in South Africa. A legionella outbreak onboard will then prove catastrophic, as the next possible port of disembarkation will be Singapore. As a result, the crew are not able to receive emergency treatment

In 2021 there have been two cases where the captain of a ship died on board and the port of disembarkation refused the ship. The ship Vantage Wave lost their Romanian captain en route to China from India, and was stuck in Asian waters while no one wanted to accept the ship. Additionally, Evergreen's Ital Libera lost their captain to COVID-19 on board and the crew was stuck at great risk of being infected themselves. The virus spread and several crew members diseased.  


How do you prevent legionella? 

For facility owners who has Legionella infestations, Chlorines in normal dosing will never solve the problem due to the marine growth. Alternatives are hot-water (65 degrees) flushing, but most installations are too big so one will never be able to flush the entire system at 65 degrees. 

Waterworks provides a safe and cost-effective disinfection system that prevents Legionella bacteria from growing by dosing biocides into the water. The system is virtually maintenance-free once it has been installed. Read more about our service or contact us for more information.

Link copied!
Archives

How to save money and energy on water disinfection
Dec 01, 2021
A medium size ship with less than 100 passengers can save around 18 000 USD every year with a smarter disinfection system. This system also removes the need for water bottles, which can save you around 24 000 USD every year with 50 passengers.
How to save energy and money on ships
Jul 12, 2021
Save energy and money by reducing the hot water system from 65 to 45 degrees. Save more money by getting rid of drinking water bottles. How? Install a biocide-based water disinfection system.
Why you should stop using UV filters for water treatment on ships
Oct 18, 2021
It is common for ships to rely on a UV filters to remove bacteria and viruses, but there are som drawbacks: the point of use problem and the biofilm problem.
Waterworks is proud of entering a relationship with Innovation Norway
Oct 23, 2020
Innovation Norway has agreed to support Waterworks with funding for Market Research Project.
We are Going Online
Oct 20, 2020
We are very excited to go public and communicate with our customers and business partners online.