External Sea Strainer for Engine

Have a tech question or tidbit you wish to share with the other Ranger Tug owners? Post it here.

External Sea Strainer for Engine

Postby dclagett on Wed Nov 08, 2017 8:15 pm

This is the first full year we have had our RT25SC and we launched the boat in April. It has stayed in the water throughout the boating season. So far I have needed to have a diver twice go down and clean the barnacles from the sea strainer to unblock the strainer due to high engine temperature. I recently went to a marina that has significant spinach looking algae on the sea bed. We were the only boat out of eight from our club that had our external sea strainer clogged with the algae. It appears to me that this external strainer may be inadequate for the boat.

My question is has anyone out there had similar problems with their RT and if so what did you do to solve the problem. I have keep boats on the Chesapeake Bay, where I keep my RT, for years without this type of issue. I use Micron CSC on the hull and so far this season, as in past seasons, I have had no barnacles. I normally don't paint the metals, however this year I was talked into painting them with Pettet Barnacle Barrier.

Thanks in advance for help with this problem.
dclagett
 
Posts: 83
Joined: Tue Aug 09, 2016 9:30 am
City: Ocean Pines
State/Province: MD
Ranger/Cutwater Model: R-25 SC
Vessel Name: DreamChaser

Re: External Sea Strainer for Engine

Postby knotflying on Thu Nov 09, 2017 7:38 am

My boat is a 2011. This is the first year I had and issue with growth blocking the external grill. However, I was able to clean it myself outfitted with a snorkel and mask and a good scraper. I think the real answer is, use the boat more. :D
“What we call reality is merely an ILLUSION we create for learning and enjoyment….”
knotflying
 
Posts: 3626
Joined: Sun Jul 25, 2010 5:42 pm
City: Charlestown
State/Province: RI
Ranger/Cutwater Model: R-27
Non-Ranger Model: http://illusionsmikeandjess.blogspot.com/
Vessel Name: (2011) Illusions

Re: External Sea Strainer for Engine

Postby Brian B on Thu Nov 09, 2017 7:42 am

Every body of water can be different regarding sea growth.
I have used the Petit Barnacle Barrier with good results but I would find some barnacle up inside the strainer where the paint doesn't reach. I have used cold galvanizing paint with very poor results (never again).
I recently hauled the boat and for the first time I applied this paint from TotalBoat. https://www.jamestowndistributors.com/u ... ling+Paint
I bought the quart so I can brush it on and get up inside the strainers, no over spray to worry about. The boat will be going to FL Jan - April so I'll see how it does.
Brian B
 
Posts: 570
Joined: Thu Apr 19, 2012 11:53 am
City: West Warwick
State/Province: RI
Ranger/Cutwater Model: R-25 SC
Vessel Name: GANSETT RANGER (2010) Yanmar 4BY2-150

Re: External Sea Strainer for Engine

Postby pickles on Tue Nov 14, 2017 1:14 pm

Hi

I was plagued by this issue in 2016, at one point I thought I detected the beginning of gills behind my ears, so often I was in the water :D unblocking the hull grate. Beginning of this year I replaced the existing grate with a bigger one...probably has about 4 times the surface area, also has a screen that you can remove and clean. This whole season I have not entered the water once (albeit once when I fell off the swim platform, and that was undoubtedly due to a couple of glasses of wine)

Pickles
pickles
 
Posts: 17
Joined: Fri Jul 17, 2015 2:35 pm
City: Groton
State/Province: CT
Ranger/Cutwater Model: R-31 CB

Re: External Sea Strainer for Engine

Postby dclagett on Tue Nov 14, 2017 5:48 pm

Knottflying - I used the boat on average 3 hours a week, still the barnacles kept coming. Also the algae I picked up clogged the external strainer to the point that the hoses from the transmission cooler to the water pump were sucked flat at rpm above 1300. All the boats I have had the internal sea strainer caught algae etc not the external one. I am going to look at Pickles approach, I just don’t think the current configuration is adequate for my environment.

Brian - let me know how that paint workes. It seems like Pettit Barnacle Barrier attracts the barnacles in my area.

Pickles - could you let me know the manufacture and model for the external strainer you use to replace the factory installed one.

Thank you all for your replies.
dclagett
 
Posts: 83
Joined: Tue Aug 09, 2016 9:30 am
City: Ocean Pines
State/Province: MD
Ranger/Cutwater Model: R-25 SC
Vessel Name: DreamChaser

Re: External Sea Strainer for Engine

Postby pickles on Wed Nov 15, 2017 1:00 pm

Hi

I replaced the strainer with this one:-

RETANGULAR SCOOP STRAINER - BUC 2349SP

All the best
Pickles
pickles
 
Posts: 17
Joined: Fri Jul 17, 2015 2:35 pm
City: Groton
State/Province: CT
Ranger/Cutwater Model: R-31 CB

Re: External Sea Strainer for Engine

Postby dclagett on Wed Nov 15, 2017 1:48 pm

Pickles,

Thanks, I will look into this type.

Richard
dclagett
 
Posts: 83
Joined: Tue Aug 09, 2016 9:30 am
City: Ocean Pines
State/Province: MD
Ranger/Cutwater Model: R-25 SC
Vessel Name: DreamChaser

Re: External Sea Strainer for Engine

Postby knotflying on Thu Nov 16, 2017 8:04 am

I can see this working to avoid barnacle buildup inside the existing scoop, but It seems to me that it will be more susceptible to getting clogged with growth etc. since the holes seem so small.
“What we call reality is merely an ILLUSION we create for learning and enjoyment….”
knotflying
 
Posts: 3626
Joined: Sun Jul 25, 2010 5:42 pm
City: Charlestown
State/Province: RI
Ranger/Cutwater Model: R-27
Non-Ranger Model: http://illusionsmikeandjess.blogspot.com/
Vessel Name: (2011) Illusions

Re: External Sea Strainer for Engine

Postby NorthernFocus on Thu Nov 16, 2017 10:18 am

Brian B wrote:Every body of water can be different regarding sea growth...

Every location IS different. And brackish water is far worse than either pure fresh or salt water. Marinas in the same estuary will have dramatically different growth rates depending on how far they are up river.

knotflying wrote:I can see this working to avoid barnacle buildup inside the existing scoop, but It seems to me that it will be more susceptible to getting clogged with growth etc. since the holes seem so small.

I had similar thoughts but we can theorize all we want. There's direct evidence from one source that is the opposite. But regarding plugging by barnacles, the strainer configuration isn't highly relevant if the barnacles are growing inside the inlet to the seacock(a typical problem).

Since we trailer marine growth isn't a concern. Our biggest issue is plugging the intake with floating eel grass. The subject strainer looks like it would surely perform better in that regard. Likely the opposite in areas where "angel hair" type algae is more common.
Dan

Never confuse confidence for competence.
NorthernFocus
 
Posts: 609
Joined: Sun Jun 29, 2014 9:02 am
City: Wasilla
State/Province: AK
Ranger/Cutwater Model: R-25 Classic
Vessel Name: Divine Focus

Re: External Sea Strainer for Engine

Postby CAPTCRUNCH on Thu Nov 16, 2017 11:15 am

Here's a long-held-but-untried idea that Rube Goldberg might approve of. Replace the 90-degree elbow on the seacock with a tee that has a plug at the upper end and the hose/nipple on the side outlet. As needed, remove the plug, open the seacock, and use an appropriately sized dowel or broomstick to ream/tamp out the thru-hull.
CAPTCRUNCH
 
Posts: 176
Joined: Fri Jan 17, 2014 10:34 am
City: ANNAPOLIS
State/Province: MD
Ranger/Cutwater Model: R-27
Non-Ranger Model: 1975 CAL 229 AUX Sloop
Vessel Name: CAL:Cat's Meow/R-27:GADGET
MMSI Number: 338167527

Re: External Sea Strainer for Engine

Postby pickles on Thu Nov 16, 2017 11:34 am

Hi

I changed to this design based on barnacle growth and weed. Mainly weed however as that was my problem last year. I boat in Connecticut and the grass weed was always the issue that had me grabbing for my facemask and snorkel. The larger surface area of this design makes the possibility of a small amount of weed clogging the screen less likely. Add to that the removable screen that I can remove at the end of each season and clean the grate and intake, seems to have resolved my issues.

Saying that I am sure I will revisit this if there is a need in the future that I become one with the fishes 

Thanks
Pickles
pickles
 
Posts: 17
Joined: Fri Jul 17, 2015 2:35 pm
City: Groton
State/Province: CT
Ranger/Cutwater Model: R-31 CB

Re: External Sea Strainer for Engine

Postby Snowbird on Thu Nov 16, 2017 1:24 pm

I have had the same problem a number of times as we do a lot of crabbing where eel grass is present. I have used a c02 cartridge with some success. The best thing I have done is make a folding brush. I used 3/4" PVC pipe a stiff brush and a flag holder all available at home depot. The flag holder is adjustable to about any angle and fits in the storage compartment on our R 29. I simply unfold to the proper angle, put it over the side and I can feel the strainer a few strokes and we are done. It works really well. If you email me I will email back a picture. snsolsen@msn.com
Snowbird
 
Posts: 14
Joined: Wed Aug 29, 2012 11:11 am
City: Burlington
State/Province: WA
Ranger/Cutwater Model: R-29 Classic
Vessel Name: Agria
MMSI Number: 338135909

Re: External Sea Strainer for Engine

Postby dclagett on Thu Nov 16, 2017 4:31 pm

Thanks for all the additional comments.

Where I am coming from is that I have been boating on the Chesapeake since 1954 and have not had the level of clogged issues with the raw water system with any other boat I have owned. Even the diver that cleaned the barnacles from the exterior of the hull strainer (not the interior of the hull strainer) told me that the strainer size looked quite small for an engine raw water intake. I had the boat pulled yesterday and met with the yard forman today at the boat and did not see any barnacles inside the hull strainer. I talked to him about changing the raw water hull intake strainer and he thinks a larger format with a screen would help. Also we discussed debris getting into the transmission oil cooler and we both think that the multi-port sea strainer inside the engine compartment is not adequate for my operating environment. The holes in the strainer are too large and there is insufficient screen area. All of my larger boats has a screen that looked more like window screen on a cylinder which the only time it clogged was from sea nettles.

So over the winter it is time for a redesign of the raw water system to copy boats built on the East coast.

Thanks again.
dclagett
 
Posts: 83
Joined: Tue Aug 09, 2016 9:30 am
City: Ocean Pines
State/Province: MD
Ranger/Cutwater Model: R-25 SC
Vessel Name: DreamChaser

Re: External Sea Strainer for Engine

Postby NorthernFocus on Fri Nov 17, 2017 11:26 am

Snowbird wrote:I have had the same problem a number of times as we do a lot of crabbing where eel grass is present. I have used a c02 cartridge with some success. The best thing I have done is make a folding brush. I used 3/4" PVC pipe a stiff brush and a flag holder all available at home depot. The flag holder is adjustable to about any angle and fits in the storage compartment on our R 29. I simply unfold to the proper angle, put it over the side and I can feel the strainer a few strokes and we are done. It works really well. If you email me I will email back a picture. snsolsen@msn.com

That's a great idea. I've only had to clear mine once and did so with a deck brush from alongside in the dingy. I posted about the experience this past summer. At the time I realized it would have been a difficult task if I'd had to do it in anything but flat calm conditions. Sounds like you've solved that problem. Yes I'll email you for said photo. Thanks.
Dan

Never confuse confidence for competence.
NorthernFocus
 
Posts: 609
Joined: Sun Jun 29, 2014 9:02 am
City: Wasilla
State/Province: AK
Ranger/Cutwater Model: R-25 Classic
Vessel Name: Divine Focus


Return to General Technical Discussion

Who is online

Users browsing this forum: No registered users and 7 guests