Re: Stus-List Rudder tangs/C 44

[Della Barba, Joe via CnC-List]

Something like this:
https://www.teledynedalsa.com/imaging/markets/mv/ndt/

I have no idea what they charge, for all I know a new rudder is cheaper.
Joe
Coquina

-Original Message-
From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Della Barba, 
Joe via CnC-List
Sent: Tuesday, March 29, 2016 14:14
To: 'cnc-list@cnc-list.com'
Cc: Della Barba, Joe
Subject: Re: Stus-List Rudder tangs/C 44

An industrial X-Ray machine might do it.
Joe
Coquina

-Original Message-
From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of sthoma20--- 
via CnC-List
Sent: Tuesday, March 29, 2016 13:19
To: cnc-list@cnc-list.com
Cc: sthom...@bellnet.ca
Subject: Re: Stus-List Rudder tangs/C 44

I don't believe that there is short of ripping it apart, and even then, cracks 
can be notoriously difficult to detect. Dyes and other techniques can sometimes 
detect faults, but I have not been able to find any reference to a test which 
is good enough to say for certain that no fault exists. A customer service rep 
at the Edson factory told me I should replace the chain and associated parts on 
their steering systems every 10 years because there is no way to tell if a 
crack problem exists. At least with a rudder, a single cracked weld is not 
likely to result in failure. 

This link is to an article on chloride stress corrosion cracking which delves 
into the subject in some detail. It will download a pdf file. 

http://www.hse.gov.uk/research/rrpdf/rr902.pdf

It is aimed primarily at chemical process vessels and piping, but the chemistry 
and physics are the same. We are dealing with chloride ions. It includes a 
chart on the differences between common stainless steels, including 304 and 
316. Crack detection techniques and the problems associated are discussed. 

Steve Thomas
C
Merritt Island, FL


 Elizabeth McDonald via CnC-List <cnc-list@cnc-list.com> wrote: 
Does anyone know of a test to check the integrity of the stainless steel tangs 
attached to the rudder post, inside the rudder?

Jim McDonald
Breakaweigh 1
Saint John NB

Sent from my iPad
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what we do, please help us pay for our costs by donating. All Contributions are 
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___

This list is supported by the generous donations of our members. If you like 
what we do, please help us pay for our costs by donating. All Contributions are 
greatly appreciated!

___

This list is supported by the generous donations of our members. If you like 
what we do, please help us pay for our costs by donating. All Contributions are 
greatly appreciated!

___

This list is supported by the generous donations of our members. If you like 
what we do, please help us pay for our costs by donating. All Contributions are 
greatly appreciated!

Re: Stus-List Rudder tangs/C 44

[Della Barba, Joe via CnC-List]

An industrial X-Ray machine might do it.
Joe
Coquina

-Original Message-
From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of sthoma20--- 
via CnC-List
Sent: Tuesday, March 29, 2016 13:19
To: cnc-list@cnc-list.com
Cc: sthom...@bellnet.ca
Subject: Re: Stus-List Rudder tangs/C 44

I don't believe that there is short of ripping it apart, and even then, cracks 
can be notoriously difficult to detect. Dyes and other techniques can sometimes 
detect faults, but I have not been able to find any reference to a test which 
is good enough to say for certain that no fault exists. A customer service rep 
at the Edson factory told me I should replace the chain and associated parts on 
their steering systems every 10 years because there is no way to tell if a 
crack problem exists. At least with a rudder, a single cracked weld is not 
likely to result in failure. 

This link is to an article on chloride stress corrosion cracking which delves 
into the subject in some detail. It will download a pdf file. 

http://www.hse.gov.uk/research/rrpdf/rr902.pdf

It is aimed primarily at chemical process vessels and piping, but the chemistry 
and physics are the same. We are dealing with chloride ions. It includes a 
chart on the differences between common stainless steels, including 304 and 
316. Crack detection techniques and the problems associated are discussed. 

Steve Thomas
C
Merritt Island, FL


 Elizabeth McDonald via CnC-List <cnc-list@cnc-list.com> wrote: 
Does anyone know of a test to check the integrity of the stainless steel tangs 
attached to the rudder post, inside the rudder?

Jim McDonald
Breakaweigh 1
Saint John NB

Sent from my iPad
___

This list is supported by the generous donations of our members. If you like 
what we do, please help us pay for our costs by donating. All Contributions are 
greatly appreciated!


___

This list is supported by the generous donations of our members. If you like 
what we do, please help us pay for our costs by donating. All Contributions are 
greatly appreciated!

___

This list is supported by the generous donations of our members. If you like 
what we do, please help us pay for our costs by donating. All Contributions are 
greatly appreciated!

Re: Stus-List Rudder tangs/C 44

[sthoma20--- via CnC-List]

I don't believe that there is short of ripping it apart, and even then, cracks 
can be notoriously difficult to detect. Dyes and other techniques can sometimes 
detect faults, but I have not been able to find any reference to a test which 
is good enough to say for certain that no fault exists. A customer service rep 
at the Edson factory told me I should replace the chain and associated parts on 
their steering systems every 10 years because there is no way to tell if a 
crack problem exists. At least with a rudder, a single cracked weld is not 
likely to result in failure. 

This link is to an article on chloride stress corrosion cracking which delves 
into the subject in some detail. It will download a pdf file. 

http://www.hse.gov.uk/research/rrpdf/rr902.pdf

It is aimed primarily at chemical process vessels and piping, but the chemistry 
and physics are the same. We are dealing with chloride ions. It includes a 
chart on the differences between common stainless steels, including 304 and 
316. Crack detection techniques and the problems associated are discussed. 

Steve Thomas
C
Merritt Island, FL


 Elizabeth McDonald via CnC-List  wrote: 
Does anyone know of a test to check the integrity of the stainless steel tangs 
attached to the rudder post, inside the rudder?

Jim McDonald
Breakaweigh 1
Saint John NB

Sent from my iPad
___

This list is supported by the generous donations of our members. If you like 
what we do, please help us pay for our costs by donating. All Contributions are 
greatly appreciated!


___

This list is supported by the generous donations of our members. If you like 
what we do, please help us pay for our costs by donating. All Contributions are 
greatly appreciated!

Stus-List Rudder tangs/C 44

[Elizabeth McDonald via CnC-List]

Does anyone know of a test to check the integrity of the stainless steel tangs 
attached to the rudder post, inside the rudder?

Jim McDonald
Breakaweigh 1
Saint John NB

Sent from my iPad
___

This list is supported by the generous donations of our members. If you like 
what we do, please help us pay for our costs by donating. All Contributions are 
greatly appreciated!