An 18 month marine cleaning interval on a fresh water generator
The marine cleaning interval on MV Hoegh Antwerp‘s fresh water generator was set by scale, and with no chemical dosing system on board, manual cleaning was the only control. Every clean meant downtime and cost. In January 2014 an HM120 was fitted to the seawater inlet pipe, roughly 10 metres from the generator. The FWG then ran 18 months at full output with no cleaning and no chemicals. An interval that long is unusual, and it came on a vessel that had no chemical route available to it. At the 18-month inspection the generator was found in good condition throughout.
The Challenges
- The marine cleaning interval was set by scale reducing FWG efficiency
- No chemical dosing system was installed on board
- Manual cleaning was increasing downtime
- Maintenance costs needed to come down
- Full output had to be maintained without chemicals
The Solution
- Unit installed: One HM120
- Installation point: seawater inlet pipe, about 10 metres from the FWG
- Installed: January 2014
- Previous treatment: manual cleaning only, no chemical dosing system
- Monitoring period: 18 months, with inspection at the end
With no dosing system to fall back on, the HM120 was the only treatment on the generator’s seawater feed. The signal disrupts the conditions that bond scale to surfaces. The generator then ran at full output without being opened until its inspection at 18 months, a marine cleaning interval reached without any chemical dosing being introduced.
