Teeing in a freshwater pipe for a heads sink

[webcraft]

Is it straightforward, or is there anything I should know?

- W

 

[Spyro]

Straightforward, mine is just teed into the galley piping but I suppose a y branch could be used if you were concerned about pressure.

 

[NormanS]

Straightforward, mine is just teed into the galley piping but I suppose a y branch could be used if you were concerned about pressure.

What difference to the pressure is it going to make, by connecting with a "y" as opposed to a "tee"?

 

[Spyro]

What difference to the pressure is it going to make, by connecting with a "y" as opposed to a "tee"?

Right angled fittings reduce flow rate. Perhaps pressure was the wrong word to use.

 

[Mikedefieslife]

They do, but you'll only ever find right angles in home setups for both hot and cold water, so it can't be that bad.

 

[VicS]

Is it straightforward, or is there anything I should know?

- W

Perfectly straightforward.
Push in plastic Tee piece if you have plumbing in plastic hose
Push on fittings if you have rigid pipewok

Use a Y fitting, rather than a T, if you believe it will make any significant difference.

 

[alahol2]

It does depend on whether you are 'pushing' the water to the tap or 'pulling' it with a pump at the sink. If 'pulling' you may need a non-return valve in the pipework to each tap otherwise you can 'pull' air from the other tap rather than water from the tank.

 

[dgadee]

Presumably you mean cold water. If also adding hot, put a temp regulator in the system - will save water (particularly if you add a shower).

 

[webcraft]

It does depend on whether you are 'pushing' the water to the tap or 'pulling' it with a pump at the sink. If 'pulling' you may need a non-return valve in the pipework to each tap otherwise you can 'pull' air from the other tap rather than water from the tank.

Thank you - that is the sort of thing I was worried about. Do any pump style taps have built in nrvs?

- W

 

[andygc]

Thank you - that is the sort of thing I was worried about. Do any pump style taps have built in nrvs?

- W

I'd be very surprised if a conventional pump tap as fitted in boats allowed reverse flow - it wouldn't work if it did - you'd be pumping the water back every time you reversed the direction of the pump lever or piston.

Mine certainly don't allow reverse flow.

PS. If your plumbing is 15mm copper or rigid plastic, push-fit is by far the easiest way to go, but if plastic don't forget you need pipe inserts.

 

[alahol2]

I'd be very surprised if a conventional pump tap as fitted in boats allowed reverse flow - it wouldn't work if it did - you'd be pumping the water back every time you reversed the direction of the pump lever or piston.

Mine certainly don't allow reverse flow.

I'm sure you are correct in principle. In practice, using Whale Flipper pumps, the water will drain back out of the pipes to the taps. It took ages before I realised why we would sometimes be pumping air through the tap even with a near full water tank. The problem was solved by putting NRVs in each pipe close to the junction.

It probably depends on the layout of the pipe work too.

 

[LadyInBed]

B&Q do a good cheap 10mm plastic fitting, like a push fit but has a grip washer and a screwdown O ring seal.

 

[Baddox]

When you cut the pipe, make sure it's cut squarely and clean off any rough edges and swarf.

 

[andygc]

I'm sure you are correct in principle. In practice, using Whale Flipper pumps, the water will drain back out of the pipes to the taps. It took ages before I realised why we would sometimes be pumping air through the tap even with a near full water tank. The problem was solved by putting NRVs in each pipe close to the junction.

Fair enough - you've had the problem of reverse flow and I haven't. My gripe with a Whale Flipper is that my water tank emptied through it on port tack on a windy day, so I had to fit an isolating valve. If the hole for the Flipper wasn't so big I'd have binned it for a V mark 6. :distress: