2 Days ago - departed the wharf - Stbd main engine S.W. St/By pump automatically cut in - stopped it - it cut in again!
Went for a walk around - found tonnes of water spraying everywhere around the front of the main engine, where the engine S.W. pump isolating valve was. Quickly stopped that engine & closed down the stbd S.W. system.
The cause of the problem was the bottom blown out of the 5 inch isolating valve - resulting in around 15 tonnes of sea water now sloshing around in the engine room & bilges. I'm very disappointed in the quality of this valve
- it's only about 39-40 years old, made in Scotland, and has flowed millions of gallons of seawater over the 37 years it has been in use. A combination of erosion from water flow, and corrosion from electrolysis.
Gotta say though, I have pulled valves in S.W. systems on Chinese-built ships that are only 5-7 years old, and they were in worse condition!!!
I attach a couple of photos here, and would point out that many of the seawater system valves in both the QE2 & SSUS are probably in worse condition as they have been just sitting with stagnating water in them for years.
Skilly