Re: FRESH WATER SAFETY CUTOFF
You make valid points. However, we feel that at some point, we must have standard operating procedures, that address issues like the one you mention. There are many systems on board that could create undesirable and sometime dangerous conditions, if we do not think them through and have operating procedures that address these conditions. In regards to the issue you correctly point out, we never leave the water pressure breaker on, while away from the boat, at night or while under way. This simple SOP addresses this concern for us.
It is my opinion that by trying to prevent all potential issues that may arise , without the need for standard operating procedures that prevent them, we will create a far more complex system, than our boats currently are, with sometimes unintended outcomes.
One of the main reasons we were drawn to the Amel concept, was the fact that thousands of the same design concepts had done what we intended to do and had been tested in real life conditions. We did not feel that Amel design were necessarily the best, but that they had been well tested and proven throughout decades of real life conditions.
Mohammad and Aty
AMEL 54 #099
From: main@AmelYachtOwners.groups.io <main@AmelYachtOwners.groups.io> On Behalf Of Steven Bode - SV Intention 1994-SM#117 via groups.io
Sent: Sunday, May 10, 2020 10:52 PM
Subject: [AmelYachtOwners] FRESH WATER SAFETY CUTOFF
FRESH WATER SAFETY SHUTOFF SYSTEM REQUEST FOR COMMENTS
Amelians, I believe that there is a serious issue with the fresh water pump system on the Super Maramu and I would like your input.
The problem: In the event of a failure of the pressurized freshwater system — a break anywhere in the water plumbing, the entire freshwater supply could be drained overboard resulting in (a) loss of critical freshwater, (b) overuse of the freshwater pump (killing it) and (c) over use of the main bilge pump (killing it, too). Don’t ask me how I know.
Situational description: The freshwater pump may be left on. This is often the case when people are onboard, for example overnight or sometimes when they are ashore (off the boat).
The pump will pressurize the water system and remain off as long as the system remains pressurized. The pump will activate automatically any time there is a drop in water pressure.
If there is a break in the pressurized water system — a fault, then the pump will activate and run continuously until it is switched off, draining the entire fresh water supply into the bilge where it will be pumped overboard by the main bilge pump. This is a costly occurrence or possibly a safety issue if fresh water can not be resupplied, for example if the boat is off shore and there is no water maker.
A Proposal: A safety mechanism is needed to prevent this. A simple solution would be a timer that is activated every time the pump is activated. When the timer expires the pump is automatically deactivated until the system is manually reset. By determining the average time the pump is running each time it is activated, the timer could be set to shut off the system whenever above average run time is encountered. For example, if the pump typically runs for an average of 60 seconds, then the timer could be set for five minutes. If the pump runs for five minutes, then the timer turns off the power to the water pump, functioning like a breaker. The pump must be reset manually like a breaker.
Resetting the breaker: Ideally, this timer circuit would reset automatically once water pressure is restored, but that is much more complicated as it would require the deactivated pump to be turned on again or some other system employed.
This is a request for comments from those of you out there who have either considered this issue or who would like to develop a solution. I propose that a timer circuit be introduced between the breaker and the pump to serve as a safety device. It would be unobtrusive as long as the water was not to remain open for more than the timer duration. I am not a circuit designer, but I have been researching homebuilt circuits that might work.
Steve Bode, Sailing Vessel Intention
Amel Super Maramu #117 (1994)
+1 415-710-6659 voice/text/whatsapp