On Jul 21, 7:23*am, "
wrote:

I'm hoping the rot is very localised.

I'd get it checked with ultrasound, if the rot is extensive it needs a
proper repair ASAP.

cheers,
Pete.

On Jul 21, 4:23*pm, "
wrote:
Hi all,
* *No rush for answers on this one, but I'm sinking... I found a bit
of water in the bilges and put it down to something benign, but on
inspection, found a blister on the paint inside the hull, which when I
burst revealed a ~2mm square hole in the hull on the bottom of the
boat. I've plugged it with gaffer tape, rubber mats and bits of wood
for now, but has anyone got any neat ways of fixing this without
taking it out of the water (boat is a 20 tonne wrought iron/mild steel
dutch barge, and a proper repair job would be ~£700)?
* I'm thinking a bolt with a big rubber washer on both sides and
liberal use of silicon sealant. I'm hoping the rot is very localised.

cheers

Jim
UK

Hi Jim,

Blistering paint in the bilge pump is often caused by stray current
which causes electrolysis corrosion. If you have these signs then
chances are your boat is being effected and unless something is done
about stopping or deterring the stray current the corrosion to the
hull won't stop.

I have found a product that can stop this altogether and can protect
the boat. Go to http://www.seabis.net and you can find out the cause
and effect and all about the product- Angeleika1

On Jul 20, 11:23 pm, "
wrote:
Hi all,
No rush for answers on this one, but I'm sinking... I found a bit
of water in the bilges and put it down to something benign, but on
inspection, found a blister on the paint inside the hull, which when I
burst revealed a ~2mm square hole in the hull on the bottom of the
boat. I've plugged it with gaffer tape, rubber mats and bits of wood
for now, but has anyone got any neat ways of fixing this without
taking it out of the water (boat is a 20 tonne wrought iron/mild steel
dutch barge, and a proper repair job would be ~£700)?
I'm thinking a bolt with a big rubber washer on both sides and
liberal use of silicon sealant. I'm hoping the rot is very localised.

cheers

Jim
UK

is the hole on a seam might be old porosity. its about 1/16 of an
inch in a 3/16ths thick hull from the sounds of the survey you got
some good steel. so get a buzz box and weld the darn thing shut. get
good penetration head over the side and look at it if its a good weld
paint it go back on grind the weld flush on the inside and prime and
paint. I assume from reading you are restoring the boat so it would
make me think of needle gunning the bilge and getting some good primer
and paint down. then i would not have to worry about how much rot i
have, i would know. checking out your zincs would be a good idea and
making sure they are welded to the hull in full contact with the
steel.
examining them would tell you if you have an electrolysis problem.

Since it is just a very small hole (less than 1/8 of an inch) in mild steel
hull you can just drill it out with an appropriate size drill bit and tap it
to be able to screw in the correct size threaded bolt/screw to use as a
plug. You have to make sure though before starting that you have all the
necessary tools (drill bit, correct tap with wrench and correct size
plugging screw) on hand since you have to accomplish the repair process
quickly to avoid getting in too much water. After you install the plugging
screw it's pretty much almost like a permanent repair and you can even weld
it in place if you want.

wrote in message
...
Hi all,
No rush for answers on this one, but I'm sinking... I found a bit
of water in the bilges and put it down to something benign, but on
inspection, found a blister on the paint inside the hull, which when I
burst revealed a ~2mm square hole in the hull on the bottom of the
boat. I've plugged it with gaffer tape, rubber mats and bits of wood
for now, but has anyone got any neat ways of fixing this without
taking it out of the water (boat is a 20 tonne wrought iron/mild steel
dutch barge, and a proper repair job would be ~£700)?
I'm thinking a bolt with a big rubber washer on both sides and
liberal use of silicon sealant. I'm hoping the rot is very localised.

cheers

Jim
UK

There are plugs available in plumbing supply shops for patching pressure
tanks. The consist of a bolt and steel/rubber washer. The bolt has an
"arrow head" on it that you drive through the hole, give a 90 degree turn
and then tighten down. I had one on my pressure tank to fix a small hole
for 15 years until the tank rusted through in another spot.

Andrew B

--
Andrew Butchart

"P D Fritz" wrote in message
...


Since it is just a very small hole (less than 1/8 of an inch) in mild
steel
hull you can just drill it out with an appropriate size drill bit and tap
it
to be able to screw in the correct size threaded bolt/screw to use as a
plug. You have to make sure though before starting that you have all the
necessary tools (drill bit, correct tap with wrench and correct size
plugging screw) on hand since you have to accomplish the repair process
quickly to avoid getting in too much water. After you install the plugging
screw it's pretty much almost like a permanent repair and you can even
weld
it in place if you want.

wrote in message
...
Hi all,
No rush for answers on this one, but I'm sinking... I found a bit
of water in the bilges and put it down to something benign, but on
inspection, found a blister on the paint inside the hull, which when I
burst revealed a ~2mm square hole in the hull on the bottom of the
boat. I've plugged it with gaffer tape, rubber mats and bits of wood
for now, but has anyone got any neat ways of fixing this without
taking it out of the water (boat is a 20 tonne wrought iron/mild steel
dutch barge, and a proper repair job would be ~£700)?
I'm thinking a bolt with a big rubber washer on both sides and
liberal use of silicon sealant. I'm hoping the rot is very localised.

cheers

Jim
UK

Sure, that's another good way. There are also pop rivets ("cherrymax"
rivets) that are watertight just like the ones they use on aircraft hulls.
With the right drill bit size, correct size rivet and a rivet installation
tool the work could be accomplished real fast, even faster than my first
suggested process. :-)

"Andrew Butchart" wrote in message
...
| There are plugs available in plumbing supply shops for patching pressure
| tanks. The consist of a bolt and steel/rubber washer. The bolt has an
| "arrow head" on it that you drive through the hole, give a 90 degree turn
| and then tighten down. I had one on my pressure tank to fix a small hole
| for 15 years until the tank rusted through in another spot.
|
| Andrew B
|
| --
| Andrew Butchart
|
| "P D Fritz" wrote in message
| ...
|
|
| Since it is just a very small hole (less than 1/8 of an inch) in mild
| steel
| hull you can just drill it out with an appropriate size drill bit and
tap
| it
| to be able to screw in the correct size threaded bolt/screw to use as a
| plug. You have to make sure though before starting that you have all the
| necessary tools (drill bit, correct tap with wrench and correct size
| plugging screw) on hand since you have to accomplish the repair process
| quickly to avoid getting in too much water. After you install the
plugging
| screw it's pretty much almost like a permanent repair and you can even
| weld
| it in place if you want.
|
| wrote in message
|
...
| Hi all,
| No rush for answers on this one, but I'm sinking... I found a bit
| of water in the bilges and put it down to something benign, but on
| inspection, found a blister on the paint inside the hull, which when I
| burst revealed a ~2mm square hole in the hull on the bottom of the
| boat. I've plugged it with gaffer tape, rubber mats and bits of wood
| for now, but has anyone got any neat ways of fixing this without
| taking it out of the water (boat is a 20 tonne wrought iron/mild steel
| dutch barge, and a proper repair job would be ~£700)?
| I'm thinking a bolt with a big rubber washer on both sides and
| liberal use of silicon sealant. I'm hoping the rot is very localised.
|
| cheers
|
| Jim
| UK
|
|
|
|