Domestic water pressure from dock

[markc]

Hi

Any advice on what pressure I should regulate the incoming dock supply to? It was reading about 1.5 bar but the water pump would come on when a tap was opened, and if off, water pressure wasn't that great. Any advice appreciated!

 

[petem]

Hi

Any advice on what pressure I should regulate the incoming dock supply to? It was reading about 1.5 bar but the water pump would come on when a tap was opened, and if off, water pressure wasn't that great. Any advice appreciated!

Depends on how good your bilge pumps are and how long you think it will take for the marina to notice that your boat is sinking !

 

[kashurst]

Normal tap water pressure is around 2 to 3 bar. Sounds like marina water pressure is too low, and hence the water pump turning on. Just fill the tank (slowly) and use that instead.

 

[markc]

Thanks. Dock pressure is very high and the boat has a pressure regulator which was set at around 1.5 bar, which was low. I've now set it at 2.5 bar. I just didn't want to go over domestic pressure.

Using the Dock supply is really useful when we're on board for an extended period because even though we carry 800 litres, it doesn't last long!

 

[MapisM]

I've been using direct dock water supply for ages, always keeping the pressure stabilizer at around 2 bar.
But that is also the working pressure of the fresh water pump, so it's normal that it starts when you open a tap, also with the dockside connection.
Otoh, I wouldn't keep the dock pressure higher than the pump one to avoid that: I simply switch the fresh water pump on/off when leaving/returning to the dock routinely, together with several other bits like instruments, wipers, A/P pump, whatever.

Last but not least, two general warnings on this matter:

1) Portofino will soon recommend you to NOT use dockside water supply at all, unless you have suicidal instincts.
According to him, the fact that I've yet to be affected by salmonella, ebola or worse is a sort of miracle.

2) If you share the concern mentioned by petem (not that you have to, since you have a properly built IT boat ), you can fit one of these self-locking valves.

 

[BartW]

the pressure of the 2 fresh waterpumps in BA, I've set at approx 1.9 Bar.
when I connect to the dock, I have a water pressure regulator that I place straight on the dock connection, (not to have dock pressure on my hose),
and this regulator is set at approx 2 Bar.


but I have to admid that we hardly ever use the dock connection,

 

[petem]

2) If you share the concern mentioned by petem (not that you have to, since you have a properly built IT boat ), you can fit one of these self-locking valves.

LOL!

Nice - was that a recent find to prevent a "BSE" (Boat Sinking Event) as I remember previous searches for such a device.

 

[markc]

I have been using the dock connection for the past 2 years and have survived thus far. I know Porto's concern of Legionella bacteria growing in the hose and being turned into a lethal aerosol at the shower end, and he does have a point, however we are only connected when on the boat and the hose is drained and stored when not in use. Also, when returning to the boat after a lengthy absence we do run the shower heads direct into a sink for a couple of minutes to minimise the aforementioned bacteria laden aerosol.

I did take a look at those blockers last year but suspected that showers on our boat would regularly exceed 50 litres. I looked for a larger one but had no luck. I suppose I could parallel a couple, but didn't give it much more thought.

I like to leave the FW pump on so that if I leave Port with say the dishwasher on, I don't have to remember to switch the pump too. When I leave the boat it's one of a bunch of 24v things that get shut off.

The other useful thing I have is that I have a seperate connection with a tap which means I can plug a hose into the boat for washing down, which is fed directly by the dock supply before it even enters the boat.

 

[Portofino]

I have been using the dock connection for the past 2 years and have survived thus far. I know Porto's concern of Legionella bacteria growing in the hose and being turned into a lethal aerosol at the shower end, and he does have a point, however we are only connected when on the boat and the hose is drained and stored when not in use. Also, when returning to the boat after a lengthy absence we do run the shower heads direct into a sink for a couple of minutes to minimise the aforementioned bacteria laden aerosol.

.

This sort of thing is verboten in public usage spaces like healthcare premises , school , restaurants, hospitals etc etc .
You need a type 2 air gap like your hone toilet ball cock mechanism .
There’s legislation in the U.K.

All that use on your marina with what you suggest are connected to each other boat toilets �� in 30 degree + air temp .

At least with your tank alone you are isolated and can suitably dose it - that’s the important difference .

Kids and old folk could have compromised immune systems.- your call :disgust:

 

[jrudge]

THRe pressure just needs to be less than the hot water relief valve !

 

[MapisM]

THRe pressure

Wazzat?

 

[jrudge]

Wazzat?

Typical. An Italian picking up on an Englishman’s typo ?

 

[MapisM]

Doh. It wasn't meant to fingerpoint a typo, I was genuinely wondering (also due to the capitalization) what the acronym meant!