throughull for Seawater Pro watermaker

[kevingeerts]

hi,

we are looking into getting a seawaterpro system (the AC 40 GPH system).
We have a through hull (trudesign 1/2 inch) that we want to use.
I am however wondering if this through hull will give enough water to the pumps or do we need a bigger one?

Anybody have this system installed with this size throughull?

[scherzoja]

I have same SWP you are fixin to get and have a 3/4" thru hull. That works well. My thru hull was existing, for the bow anchor washdown and I just share it with the water maker intake.

Half inch will probably be ok. My 3/4" hose is only for the first 12" or 15" after the thru hull. After that, it's 1/2" ID tubing to the boost pump and thereafter.

Only issue will be thru hull ID constriction from marine growth. Not sure if that'll be a problem. 40 gph is only 2/3 gallon per minute. Half inch will probably keep up.

[stormalong]

Originally Posted by scherzoja

I have same SWP you are fixin to get and have a 3/4" thru hull. That works well. My thru hull was existing, for the bow anchor washdown and I just share it with the water maker intake.

Half inch will probably be ok. My 3/4" hose is only for the first 12" or 15" after the thru hull. After that, it's 1/2" ID tubing to the boost pump and thereafter.

Only issue will be thru hull ID constriction from marine growth. Not sure if that'll be a problem. 40 gph is only 2/3 gallon per minute. Half inch will probably keep up.

90% of watermaker intake is rejected. So to make 40 gallons per hour 400 gallons must be inputted.
About 6 and 2/3rds per minure.

[BobFord]

I make 120 litre per hour . An exclusive inlet of 20mm works well , also using a lift pump.
Suggest magnetic drive for Lift Pump.

[mvweebles]

Originally Posted by stormalong

90% of watermaker intake is rejected. So to make 40 gallons per hour 400 gallons must be inputted.
About 6 and 2/3rds per minure.

I have a CruiseRO 40gph that I installed last year. Discharge is miniscule, far from 90%.

I have a manifold off a large sea strainer. Valve to watermaker is 1/2" and no problem. I'd be more concerned about having a good sized sea strainer vs worrying about 1/2" vs 3/4" through-hull.

BTW - not very happy with my CruiseRO. Wish I'd gone with with SWP.

[stormalong]

Originally Posted by mvweebles

I have a CruiseRO 40gph that I installed last year. Discharge is miniscule, far from 90%.

I have a manifold off a large sea strainer. Valve to watermaker is 1/2" and no problem. I'd be more concerned about having a good sized sea strainer vs worrying about 1/2" vs 3/4" through-hull.

BTW - not very happy with my CruiseRO. Wish I'd gone with with SWP.

Check this out: https://www.cruisersforum.com/forums...ion-30087.html

Maybe you are discharging more reject brine than you think.

[SailingHarmonie]

Originally Posted by kevingeerts

hi,

we are looking into getting a seawaterpro system (the AC 40 GPH system).
We have a through hull (trudesign 1/2 inch) that we want to use.
I am however wondering if this through hull will give enough water to the pumps or do we need a bigger one?

Anybody have this system installed with this size throughull?

That system comes with 3/4" ID tubing as the feed line. If you check the actual size of plumbing fittings you will see that 1/2" PIPE is very close to 3/4" ID, and in fact is larger than that unless you are using very heavy wall pipe. In other words, a 1/2" thru-hull will work fine, assuming that the 3/4" tubing is sized correctly.

[SailingHarmonie]

Originally Posted by mvweebles

I have a CruiseRO 40gph that I installed last year. Discharge is miniscule, far from 90%.

I have a manifold off a large sea strainer. Valve to watermaker is 1/2" and no problem. I'd be more concerned about having a good sized sea strainer vs worrying about 1/2" vs 3/4" through-hull.

BTW - not very happy with my CruiseRO. Wish I'd gone with with SWP.

Miniscule? I don't think so.

If this is true, run, don't walk, down to the patent office and get that magic watermaker you have protected. Because it is well and truly magic as it violates the laws of physics.

[mvweebles]

Originally Posted by SailingHarmonie

Miniscule? I don't think so.

If this is true, run, don't walk, down to the patent office and get that magic watermaker you have protected. Because it is well and truly magic as it violates the laws of physics.

Thanks - I will check next time I'm at the boat. She's on the hard in Chiapas MX (near Guatemala border on Pacific side) for the summer. Headed back late October/early November headed to Panama, eventually to Florida.

[Tellie]

A lot depends on the watermaker and it's size. There are 10% systems that the 10% to your tank and 90% overboard brine are common. But there are certainly 20% and larger systems as well.

[sailorboy1]

I think the OP should ask SWP the question!

[GordMay]

FWIW:
Nominal Pipe Size [NPS] is a North American standard for identifying pipe sizes. Technically, the NPS is non-dimensional, and only roughly refers to the outside diameter of the pipe. A pipe's schedule is the thickness of the pipe wall, which directly affects the interior dimension.

Stainless Steel Pipe dimensions:
½" Schedule 40S: 0.840" OD ~ 0.622" ID
½" Schedule 80S: 0.840" OD ~ 0.546" ID

Tubes are structural members, and are measured with an exact outside diameter. Tubing is measured by the exact outside diameter, and the wall thickness (WT). The manufacturing tolerances are much tighter than in pipes.

Outside of North America, pipes are identified by Diametre Nominel (DN), which is a dimensionless value, that roughly equates to the outside diameter of the pipe in mm [per ISO 6708].

[kevingeerts]

Originally Posted by sailorboy1

I think the OP should ask SWP the question!

Hey I definitely already did that. And there answer was that they are not 100% sure about this and that I should test it.
That's why I came to the forum to see if other already had done this with this size of through hull.

[sailorboy1]

Originally Posted by kevingeerts

Hey I definitely already did that. And there answer was that they are not 100% sure about this and that I should test it.
That's why I came to the forum to see if other already had done this with this size of through hull.

Well have you tried it? If a forum person says it is too small are you just not going to try it?

I think a lot of whether it works or not is the length between the through hull and the boost pump

[kevingeerts]

Originally Posted by sailorboy1

Well have you tried it? If a forum person says it is too small are you just not going to try it?

I think a lot of whether it works or not is the length between the through hull and the boost pump

Haven't tried it yet as we are still in the pre install phase. Was just trying to get a hunch if it would work or not. If from all responses it was a big no no we could adjust this winter. But I think it is worth a try with the small through hull as the boost pump will be very close.