About the only place I've seen "expansion joints", is on Navy ships
(which is not to say some passenger ships might have them).
On a tanker, the only place you'll see them will be on catwalks and in
piping (G can get downright squeaky).
Tankers, being built with longitudinal framing, tend to bend more, in
that direction.

otn

DSK wrote:
otnmbrd wrote:


Doesn't really matter what size the boat is, you will get some degree of
"flex", especially when you remove it from the water and put it on a
hard stand. BG you want to see flex, you should watch and listen to a
large tanker at sea, or watch one go from hog to sag when loading.


Sure. Why else would they build expansion joints into the upper decks of big (or even
medium-sized) ships?

They are common in engineering in an pipe system that is exposed to wide
temperatuire fluctualtions.

Cheers MC

otnmbrd wrote:

About the only place I've seen "expansion joints", is on Navy ships
(which is not to say some passenger ships might have them).
On a tanker, the only place you'll see them will be on catwalks and in
piping (G can get downright squeaky).
Tankers, being built with longitudinal framing, tend to bend more, in
that direction.

otn

DSK wrote:

otnmbrd wrote:


Doesn't really matter what size the boat is, you will get some degree of
"flex", especially when you remove it from the water and put it on a
hard stand. BG you want to see flex, you should watch and listen to a
large tanker at sea, or watch one go from hog to sag when loading.



Sure. Why else would they build expansion joints into the upper decks
of big (or even
medium-sized) ships?

On a tanker, Dresser couplings are used less for temperature
fluctuations, than for longitudinal flexing due to load and or working
in a seaway.
The same would apply to the flex joints that DSK was talking about.

otn

The_navigator© wrote:
They are common in engineering in an pipe system that is exposed to wide
temperatuire fluctualtions.

Cheers MC

otnmbrd wrote:

About the only place I've seen "expansion joints", is on Navy ships
(which is not to say some passenger ships might have them).
On a tanker, the only place you'll see them will be on catwalks and in
piping (G can get downright squeaky).
Tankers, being built with longitudinal framing, tend to bend more, in
that direction.

otn

DSK wrote:

otnmbrd wrote:


Doesn't really matter what size the boat is, you will get some
degree of
"flex", especially when you remove it from the water and put it on a
hard stand. BG you want to see flex, you should watch and listen to a
large tanker at sea, or watch one go from hog to sag when loading.




Sure. Why else would they build expansion joints into the upper decks
of big (or even
medium-sized) ships?

4 thou. measured on the back of a boat? Complete BS.

Cheers MC

DSK wrote:

I remember reading about a New Orleans Marine hotshot racing boat built back in the 1980s, which
had a hull & deck of uncored glass & mat with a subimposed grid of straight S-glass. Everybody
guffawed and said "Those hicks sure don't know how to build racing boats, shoulda used foam
core" but the builder shrugged and said that they measured the bend in the hull/deck with
15,000# tension on the backstay.... it was 4 thousands of an inch....

Fresh Breezes- Doug King

Ever heard of temperature?

MC

DSK wrote:


Sure. Why else would they build expansion joints into the upper decks of big (or even
medium-sized) ships?