logo
Welcome Guest! To enable all features please Login or Register.

Notification

Icon
Error
D-icer and CAPAC Readings
Options View
Previous Topic Next Topic
Barkleydave
#1 Posted : Saturday, January 16, 2010 11:02:08 AM(UTC)
Barkleydave

Rank: Marinette Royal Aluminum Poster (300+) posts

Groups: Member
Joined: 12/4/2007(UTC)
Posts: 460
Points: -618

Thanks: 3 times
Was thanked: 7 time(s) in 6 post(s)
Here is a new twist and I thought I had seen it all when it comes to Galvanic Readings.

This is the first year where ice in the marina has become a concern. This year I had close to 6 inches locking my M in tight. I began to panic a little when my shaft packing began drippin. (both developed very slow leaks and might have been from pressure on the hull)

Ok ...I put in a brand new Kosko 1/2 HP D-icing unit. It is slung under the hull at midship. It worked great and the boat was free in only a few hrs.

Now this is what I noticed. When the unit is on my CAPAC reading drops to .62. I turn unit off and readings return to my normal .92 reading.

This is an AC unit running through the ships electrical and through the galvanic isolator. It is also GFIC.

? Is the unit causing the lower readings when turned on because of?
A) Loss of potential which would be a potential corrosive condition or..
B) The turbulance created when the unit is running. (I know my CAPAC readings are way off under way)

Note: Readings are normal with unit off but submerged so it is NOT a disimular metal situation since the unit is isolated from the the hull except for electrical connection which again is grounded properly through the galvanic isolator.

Thoughts?

I figure I will not have the unit on for long periods of time. The ice is clear in my slip now and may not return unless we get another nasty cold snap.

dave
None
Back to top
Sponsor
Please Register : To weed out spammers, new members may not post until approved. An email is usually sent after approval. This forum is for Marinette Owners and other aluminum boat boaters who wish to share boating information. Aluminum Roamer owners are also welcome. (Do not post content you do not have the right to post and mass (robots) posters are unwelcome. We also have a marine electronics page and lots of Chrysler Engine info. State by what permission you copy content and give credit properly.) The site is now fixed with some more Chrysler information. We have space for pictures on the new location. Use shinkpic to autochange size http://www.onthegosoft.com/sp_download.htm

Great Sites - http://www.marinette.com Marinette Company

http://web.me.com/dougmrose/Doug_Roses_Website/Welcome.html

http://fastjeff.tripod.com/ Repair Tricks and Techniques for Marinettes

http://www.greatlakesmarinetteclub.com/

PLEASE post in the appropriate folder. Please, do not post your actual email address in publicly readable websites. The first rule is be a class act.
Back to top  
Ed
#2 Posted : Saturday, January 16, 2010 12:24:58 PM(UTC)
Rank: Top Rank Aluminum Star

Groups: Member
Joined: 3/5/2008(UTC)
Posts: 208
Points: -522

Thanks: 1 times
Was thanked: 4 time(s) in 4 post(s)
Sounds like you have a slight voltage leak, or somewhere you are inducing a current into the hull, wiring, or Capac circuit. I'd first check that connections are all dry. Good luck, Ed
BUSIA
32 foot, no flybridge, twin 350 (chevy) Crusaders, closed (freshwater) cooling, 1:1 Velvet drive transmissions.
Proud to be IBEW.
Back to top
Docsnow
#3 Posted : Saturday, January 16, 2010 6:41:52 PM(UTC)
Docsnow

Rank: Marinette Royal Aluminum Poster (300+) posts

Groups: Admin, Administration
Joined: 12/4/2007(UTC)
Posts: 1,871
Points: 4,247

Thanks: 2 times
Was thanked: 28 time(s) in 28 post(s)
Dave,

Can U explain how the de-icer functions is it a bubble type or a heating element ? How close to the Capac senor is the de-icer mounted? If it’s mounted near it move it farther a way see if your reading change if they do then the unit is leaking a small amount of a electrical charge probably just enough to change the
readings ? The reason I mention this cause on my other Marinette 74 Express which had a dual forward scan of (168*) depth sounder & normal functioning sounder mounted thru the original depth sound hole in the hull when in forward scan the Capac meter read in ranges U described & when I’d switch to the normal sounder straight down the reading would return to normal just my ½ penny’s worth.
BTW when the De-icer free’d the pressure on the hull did the leak at the packing gland slow or
stop ?

Norm,

Big BigMs Live On Applause
http://www.picturetrail.com/gid23690601 Try it now there's music to listen to while U view the Big M's

http://www.PictureTrail..../index.php?clubID=20726 this one for the Pix club


 You'll have bad times, but they'll just wake you up to the good times you weren't paying attention to

Some people try to turn back their odometers.Not me, I want people to know "why" I look this way.I've traveled a long way and some of the roads weren't paved.
Back to top
Rick100
#4 Posted : Saturday, January 16, 2010 10:42:55 PM(UTC)
Rick100

Rank: Dedicated Tin Star

Groups: Member
Joined: 5/25/2009(UTC)
Posts: 74
Points: 228
Dave, It might be because the bubbles are creating air pockets around the sensor, therefore the sensor will not see solid water. Rick
When I die I hope my wife sells my stuff for more than I told her I paid for it.
Back to top
Roger2
#5 Posted : Sunday, January 17, 2010 1:43:27 AM(UTC)
Roger2

Rank: Marinette Royal Aluminum Poster (300+) posts

Groups: Member
Joined: 12/16/2007(UTC)
Posts: 567
Points: 879

Thanks: 3 times
Was thanked: 5 time(s) in 5 post(s)
I'm with Rick,
The GFI would catch any leakage and trip.
Roger
Sea Jay
1983 37 double cabin, twin 230hp Volvo diesels, twin disk 1.5-1 20X 23 4 blade props
Back to top
Barkleydave
#6 Posted : Sunday, January 17, 2010 2:26:52 AM(UTC)
Barkleydave

Rank: Marinette Royal Aluminum Poster (300+) posts

Groups: Member
Joined: 12/4/2007(UTC)
Posts: 460
Points: -618

Thanks: 3 times
Was thanked: 7 time(s) in 6 post(s)
The D-icer or other trade name of Ice Eater is a very simple solution used for many years around docks, boats ponds etc.

It consists of an electric motor with a propeller that pulls water up from lower depths to the surface. This warmer water melts surface ice and circulates.

I agree I did more tests and there is absolutely NO voltage leak. I show no stray AC current and if there were any the GFIC would also be tripping.

The unit is slung under the boat about just below the keel mid ships which puts it very close to the CAPAC Cathode.
I moved the unit after and the readindings moved up and lowered it and the readings also changed.. so it must be effecting the readings due to turbulence. I am no longer concerned about it but thought it was interesting. After mky first post I remember checking readings while the boat was in motion (just idle spped) and the readings drop significantly. So just a false reading. Also the 1/2 HP motor the electromagnetic interference may also have an effect on the readings when it is running.
None
Back to top
Doug Doty
#7 Posted : Monday, January 18, 2010 1:45:26 AM(UTC)
Doug Doty

Rank: Marinette Royal Aluminum Poster (300+) posts

Groups: Member
Joined: 8/10/2009(UTC)
Posts: 320
Points: 3,626

Was thanked: 8 time(s) in 7 post(s)
Hope it did't chip up your gel coat all around the water line !! HA HA HA.. Plastic boater problem... You should of teased the other guys in the marina about.... " Thinking about go out for a ride "
466 Bertram FDMY, " Easy Rider "
1984 39 Marinette sedan, " LIBERTY ONE "
440'S 19x22 wheels, 710 HOURS
Back to top
 |  Edit by user
Barkleydave
#8 Posted : Monday, January 18, 2010 10:46:47 AM(UTC)
Barkleydave

Rank: Marinette Royal Aluminum Poster (300+) posts

Groups: Member
Joined: 12/4/2007(UTC)
Posts: 460
Points: -618

Thanks: 3 times
Was thanked: 7 time(s) in 6 post(s)
Hi Doug.. no problem but it did scrape up the anti fouling paint a bit at water line.

Ice is out and I doubt it will freeze in again this year.


dave
None
Back to top
Docsnow
#9 Posted : Monday, January 18, 2010 10:51:15 AM(UTC)
Docsnow

Rank: Marinette Royal Aluminum Poster (300+) posts

Groups: Admin, Administration
Joined: 12/4/2007(UTC)
Posts: 1,871
Points: 4,247

Thanks: 2 times
Was thanked: 28 time(s) in 28 post(s)
Dave,

BTW when the De-icer free’d the pressure on the hull did the leak at the packing gland slow or
stop ?

Norm,

Big BigMs Live On Applause
http://www.picturetrail.com/gid23690601 Try it now there's music to listen to while U view the Big M's

http://www.PictureTrail..../index.php?clubID=20726 this one for the Pix club


 You'll have bad times, but they'll just wake you up to the good times you weren't paying attention to

Some people try to turn back their odometers.Not me, I want people to know "why" I look this way.I've traveled a long way and some of the roads weren't paved.
Back to top
Barkleydave
#10 Posted : Monday, January 18, 2010 1:08:01 PM(UTC)
Barkleydave

Rank: Marinette Royal Aluminum Poster (300+) posts

Groups: Member
Joined: 12/4/2007(UTC)
Posts: 460
Points: -618

Thanks: 3 times
Was thanked: 7 time(s) in 6 post(s)
Docsnow,

It was interesting. I always pull my shaft packing glands up a little to insure no drip during the off season.

Prior to ice.. the bildge was completely dry. (under a covered dock) Once the ice reached more than 4 inches I checked the bilger and noticed a VERRY slow drip from each gland. (one drop every 30 seonds)

Making no adjustments.. I put the ice deather in and the ice was gone in less than 8 hrs and next day I checked shafts and NO drip what so ever!

safe boating,

dave
None
Back to top
jimski2
#11 Posted : Monday, January 18, 2010 10:55:18 PM(UTC)
Rank: Top Rank Aluminum Star

Groups: Member
Joined: 11/3/2008(UTC)
Posts: 147
Points: 71

Was thanked: 3 time(s) in 3 post(s)
My AquaView Camera has a temperature indicator on it that I use for ice fishing. The temperature on the bottom under the ice is always 39 degrees F. Bringing the bottom water up is an easy way to clear the ice.
Back to top
Roger2
#12 Posted : Monday, January 18, 2010 11:31:31 PM(UTC)
Roger2

Rank: Marinette Royal Aluminum Poster (300+) posts

Groups: Member
Joined: 12/16/2007(UTC)
Posts: 567
Points: 879

Thanks: 3 times
Was thanked: 5 time(s) in 5 post(s)
My packing glands aren't dripping at all, OH Yea, I guess they wouldn't up on stands.

Sorry, I couldn't help my self.

Roger
Sea Jay
1983 37 double cabin, twin 230hp Volvo diesels, twin disk 1.5-1 20X 23 4 blade props
Back to top
Docsnow
#13 Posted : Monday, January 18, 2010 11:52:05 PM(UTC)
Docsnow

Rank: Marinette Royal Aluminum Poster (300+) posts

Groups: Admin, Administration
Joined: 12/4/2007(UTC)
Posts: 1,871
Points: 4,247

Thanks: 2 times
Was thanked: 28 time(s) in 28 post(s)
Dave,

Thanks for the come back on the packing seals glad it all worked good for U Applause

Norm,

Big BigMs Live On Applause
http://www.picturetrail.com/gid23690601 Try it now there's music to listen to while U view the Big M's

http://www.PictureTrail..../index.php?clubID=20726 this one for the Pix club


 You'll have bad times, but they'll just wake you up to the good times you weren't paying attention to

Some people try to turn back their odometers.Not me, I want people to know "why" I look this way.I've traveled a long way and some of the roads weren't paved.
Back to top
Users browsing this topic
guest
Forum Jump  
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.

Powered by YAF 1.9.5.5 | YAF © 2003-2011, Yet Another Forum.NET
This page was generated in 0.144 seconds.