Cruisers Forum
 


Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 24-06-2022, 09:52   #1
Registered User

Join Date: Nov 2013
Location: Nice, France
Boat: Hunter Marine 38
Posts: 1,271
Venturi tube to evacuate AC condensate water

On our H38 we have an airco installed in the main cabin behind the mast. The condensate water is evacuated straight in the bilge. I prefer to have a dry bilge so I installed a big plastic water bottle (12 liters) to accumulate this water and keep the bilge dry. This works but you have to empty the bottle regularly.

The AC is seawater cooled and the Little Giant pump is continuously pumping seawater through the AC unit. The better solution would be to install a venturi tube in this seawater hose right before the through hull and evacuate the condensate water this way.

I have been looking for venturi tubes on the internet but have not found a venturi tube that I can insert in the 5/8” hose of my installation.

Have anybody succesfully installed this solution, and WHERE can I buy this simple venturi tube? Thanks for directing me to the right place.
sailormed is offline   Reply With Quote
Old 24-06-2022, 10:20   #2
Registered User

Join Date: Apr 2007
Location: Australia
Boat: Island Packet 40
Posts: 5,431
Images: 7
Re: Venturi tube to evacuate AC condensate water

That's a good idea if you can make it work.

You can make a crude venturi using pipe fittings.
__________________
Satiriker ist verboten, la conformité est obligatoire
RaymondR is offline   Reply With Quote
Old 24-06-2022, 11:18   #3
Senior Cruiser

Cruisers Forum Supporter

Join Date: Mar 2009
Location: Annapolis, MD
Boat: Southerly 480
Posts: 252
Images: 1
Re: Venturi tube to evacuate AC condensate water

Not a venturi pump, but this is what I used on my last boat
https://rectorseal.com/aspen-pump-aqua-series-group/
shimari is offline   Reply With Quote
Old 24-06-2022, 11:24   #4
Registered User

Join Date: Jul 2021
Location: New Orleans
Boat: Tashiba 40
Posts: 19
Re: Venturi tube to evacuate AC condensate water

These are the parts and prices from 2 years ago:

⅝" Barb to ¾" NPT Female Plastic
McMaster Carr 5218K739
Plastic Barbed Hose Fitting for Water, Adapter, 5/8" Hose ID, 3/4 NPT Female, 150 PSI
2x $2.49
https://www.mcmaster.com/

Venturi Siphon
Amazon B00I3VK6S4
Mazzei (784-PVDF) Gas/Liquid Injector - Kynar Black 3/4" MNPT
$45.98
https://smile.amazon.com/Mazzei-784-...dp/B00I3VK6S4/

½" Strainer
Amazon B00I3VK6S4
1/2" Hose Barb in-Line Strainer with 50 mesh Stainless Steel Filter Screen
$11.25

The strainer is no longer listed but it looks like this one: https://smile.amazon.com/Strainer-Tw...dp/B094NQNVMF/

I'm a live aboard in New Orleans so it sees a lot of use and the venturi has never clogged.
Weatherbird is offline   Reply With Quote
Old 24-06-2022, 12:00   #5
Registered User

Join Date: Mar 2022
Location: Ontario Canada
Boat: Jeanneau SO 389
Posts: 1,383
Re: Venturi tube to evacuate AC condensate water

Prepare yourself for a whacky idea but how about a condensation tube, accumulator and one way valve all in one cheap?
It’s called a Tesla Straw. Lots of 3D printers have the data. I’ve printed them in TPU 95 which is a fairly rigid but flexible and soft plastic. Looks silly but it will work really well. A simple version of it fixes toilets also.
Attached Thumbnails
Click image for larger version

Name:	B6193141-EC80-4105-984F-80E61D61EC5E.jpeg
Views:	72
Size:	62.6 KB
ID:	259963  
Rumrace is offline   Reply With Quote
Old 24-06-2022, 12:03   #6
Registered User

Join Date: Mar 2022
Location: Ontario Canada
Boat: Jeanneau SO 389
Posts: 1,383
Re: Venturi tube to evacuate AC condensate water

How a Tesla Valve works
Attached Images
 
Rumrace is offline   Reply With Quote
Old 24-06-2022, 12:13   #7
Registered User

Join Date: Dec 2019
Location: Clear Lake Shores, TX
Boat: 2000 Catalina 470 #058
Posts: 811
Re: Venturi tube to evacuate AC condensate water

hmm, can you not just run the drain tubing to your grey water sump???
__________________
Sailing a Catalina 470; Working hard
GreenWave is offline   Reply With Quote
Old 24-06-2022, 12:37   #8
Registered User
 
Sailmonkey's Avatar

Join Date: Sep 2009
Location: Houston
Boat: '76 Allied Seawind II, 32'
Posts: 9,445
Re: Venturi tube to evacuate AC condensate water

I’ve been using one for at least the last 10 years on our AC condensate.

https://www.google.com/search?q=3%2F...&client=safari

The caveat is that it does introduce a restriction in the flow, so if you’ve got marginal seawater flow already this may be the final straw.
Sailmonkey is offline   Reply With Quote
Old 24-06-2022, 14:28   #9
Registered User

Join Date: Aug 2018
Location: Caribbean
Boat: 44 FP Cat & 45 Sea Ray motor yacht
Posts: 321
Re: Venturi tube to evacuate AC condensate water

I don't waste the condensation water. Once collected it is pumped to the fresh water tank. From there it goes through a reverse osmosis 7 stage filter to the drinking water tap. I use airconditioner condensation on my farmhouse, but there I drink it almost as is. I run it through a coffee filter bag once, because it is an open system and some dirt collects too.
Gerrit Coetzee is offline   Reply With Quote
Old 24-06-2022, 14:58   #10
Registered User

Join Date: Jun 2010
Location: Caribbean
Boat: Corbin Ketch 39ft
Posts: 282
Re: Venturi tube to evacuate AC condensate water

I don't quite picture it. It sounds like you are trying to set up a venturi using seawater system to suck freshwater out of the boat. What happens if the sea water pump stops, will it then allow sea water to flow back into the condensate sump and into the boat. Keep sea water out of the people tank.
__________________
Joe Bayne
Jubilee
Jubilee39 is offline   Reply With Quote
Old 24-06-2022, 15:11   #11
Registered User

Join Date: May 2015
Location: Gulf Coast, USA
Boat: Beneteau 43
Posts: 50
Re: Venturi tube to evacuate AC condensate water

We have used the same method as Weatherbird since 2011 and it works great. Also added a small 12v pump with a toggle switch that can be turned on to pump out any residual condensation that may drip after unit is off and collect in the pan.
sailorbobdeb is offline   Reply With Quote
Old 24-06-2022, 15:28   #12
Registered User

Join Date: Mar 2014
Posts: 54
Re: Venturi tube to evacuate AC condensate water

Venturi is the principle behind the Mermaid Condensator - https://www.mmair.com/marine-divisio...d-condensator/. The Mermaid includes a check valve to prevent back flow from the cooling water circuit into the condensate pan. Relying on a check valve below the waterline for that purpose makes me a little nervous, but plenty of people use them successfully.
Davidasailor is offline   Reply With Quote
Old 24-06-2022, 15:38   #13
Registered User

Join Date: Jul 2021
Location: New Orleans
Boat: Tashiba 40
Posts: 19
Re: Venturi tube to evacuate AC condensate water

If you use the parts I listed you also need one of these:

½" barb to ¼" FNPT Plastic
McMaster Carr 5218K734
Plastic Barbed Hose Fitting for Water, Adapter, 1/2" Hose ID, 1/4 NPT Female, 150 PSI
$1.86
https://www.mcmaster.com/

I used reinforced fresh water hose for the drain.

Also the venturi siphon has a built in check valve.
Weatherbird is offline   Reply With Quote
Old 24-06-2022, 15:50   #14
Registered User
 
S/V Illusion's Avatar

Join Date: Oct 2007
Location: Lakewood Ranch, FLORIDA
Boat: Alden 50, Sarasota, Florida
Posts: 3,057
Re: Venturi tube to evacuate AC condensate water

Been using a Venturi on our A/C condensate pans for many years. Works perfectly and no moving parts.

Any waterbed store has them in a kit intended to empty the bed and equivalent to but a lot cheaper than the Mermaid marketed type.
S/V Illusion is offline   Reply With Quote
Old 24-06-2022, 16:23   #15
Registered User

Join Date: May 2022
Posts: 229
Re: Venturi tube to evacuate AC condensate water

Not completely sure it would work with your system, but every chem lab has a faucet mounted venturi to pull vacuum in a quick and easy way. Might be too much restriction and flow rate from the little giant too low, but it is exactly what you want.
ItDepends is offline   Reply With Quote
Reply

Tags
water

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
When they evacuate the marina, get out... Hurricane Zeta Pearson365Guy Emergency, Disaster and Distress 22 17-11-2020 10:10
Electric toilet water intake sucked dry by venturi effect when sailing davidkuehner Plumbing Systems and Fixtures 21 17-08-2019 14:20
Told to evacuate damaged marina CMO Tashina Emergency, Disaster and Distress 0 20-10-2018 15:55
Actual Experience with DIY A/C Condensate Venturi Pump ? batkins61 Plumbing Systems and Fixtures 15 12-07-2011 06:00

Advertise Here


All times are GMT -7. The time now is 22:02.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2022, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2022, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.