Intermittent Hi Pressure Faults

I have been chasing intermittent hi pressure faults on our friends Hatt for a few months now.

Half of the boats systems run from one pump, strainer, sea-cock, hoses and water manifolds, the other half on their own pump and stuff.
Just the systems on the one set up has this problem.
I would stay on the boat all day and it never would fault. The owner returns and one would fault within hours.
I was starting to think he was possessed with an A/C curse.
Thru the months of headache, rotated pumps, strainers and re-arranged a manifold.
Every time thought I got it.
Then one of the units would cycle and finally fault off line, hours later, with the owner onboard.

Then I saw it, the water discharge fluttered for a second. Knowing it was not the pump, I cut a hose open.

Hose Pox.
The inside of the hose was de-laminating.
All hoses replaced. Owner onboard 2 days now. All good.


I have found this before on engine raw water supply hoses, I kicked my self for not thinking of this earlier.

Yep, ship happens.