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Technical Discussions
Robert McMillen
Robert McMillen
01:28 Jul-10-2006
weld testing bulkhead / deck penetrations

A bulkhead penetration is basically a pipe passing through a steel ship's bulkhead. Once the pipe is welded and the weld is tested for watertightness (not for structural integrety), an electrical cable can then be passed through the penetration. Currently, two mechanics are required to test the penetration. One mechanic routes an air hose to one side while the other carries a bucket of soap suds with a brush to the other side of the bulkhead. Air is applied on one side and the other mechanic applies the soap and looks for bubbles. This is a two man operation which take a lot of time. Does anyone know of a simple (shipyard mechanic simple) means of testing a weld on one side of a bulkhead for watertight integrety (looking for holes in the welds only? The penetrations are normally 1 to 3 inches in diameter.


 
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John Woollven
John Woollven
07:58 Jul-11-2006
Re: weld testing bulkhead / deck penetrations
We have successfully tested penetrations using UE Systems ultrasonic leak testing equipment. We would place an ultrasonic tone generator on one side and scan for leakage on the other side. Several penetrations can be tested at one time using this method.

We verified the process by making several mockups with pinhole leaks. Of course the testing is done prior to coating.

John

----------- Start Original Message -----------
: A bulkhead penetration is basically a pipe passing through a steel ship's bulkhead. Once the pipe is welded and the weld is tested for watertightness (not for structural integrety), an electrical cable can then be passed through the penetration. Currently, two mechanics are required to test the penetration. One mechanic routes an air hose to one side while the other carries a bucket of soap suds with a brush to the other side of the bulkhead. Air is applied on one side and the other mechanic applies the soap and looks for bubbles. This is a two man operation which take a lot of time. Does anyone know of a simple (shipyard mechanic simple) means of testing a weld on one side of a bulkhead for watertight integrety (looking for holes in the welds only? The penetrations are normally 1 to 3 inches in diameter.
------------ End Original Message ------------




 
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S.Senthilkumar
S.Senthilkumar
04:31 Jul-13-2006
Re: weld testing bulkhead / deck penetrations
A bulkhead can be tested for full penetration by Ultrasonic will be more approprite. RT can tell only any volumemetric defect. Using the approprite transuducer angle it will be possible to ensure the penetration.
Good bye
S.Senthilkumar


 
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Joe Buckley
Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT, United Kingdom, Joined Oct 1999, 528

Joe Buckley

Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT,
United Kingdom,
Joined Oct 1999
528
01:46 Jul-13-2006
Re: weld testing bulkhead / deck penetrations
Sonatest has just launched the 'SoundScan' system for this application. It has been proven on shipboard, aviation, military and orbital applications for leak detection.

Contact me for more information or check out our web-page

----------- Start Original Message -----------
: We have successfully tested penetrations using UE Systems ultrasonic leak testing equipment. We would place an ultrasonic tone generator on one side and scan for leakage on the other side. Several penetrations can be tested at one time using this method.
: We verified the process by making several mockups with pinhole leaks. Of course the testing is done prior to coating.
: John
: : A bulkhead penetration is basically a pipe passing through a steel ship's bulkhead. Once the pipe is welded and the weld is tested for watertightness (not for structural integrety), an electrical cable can then be passed through the penetration. Currently, two mechanics are required to test the penetration. One mechanic routes an air hose to one side while the other carries a bucket of soap suds with a brush to the other side of the bulkhead. Air is applied on one side and the other mechanic applies the soap and looks for bubbles. This is a two man operation which take a lot of time. Does anyone know of a simple (shipyard mechanic simple) means of testing a weld on one side of a bulkhead for watertight integrety (looking for holes in the welds only? The penetrations are normally 1 to 3 inches in diameter.
------------ End Original Message ------------




 
 Reply 
 
Joe Buckley
Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT, United Kingdom, Joined Oct 1999, 528

Joe Buckley

Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT,
United Kingdom,
Joined Oct 1999
528
01:47 Jul-13-2006
Re: weld testing bulkhead / deck penetrations
Sonatest has just launched the 'SoundScan' system for this application. It has been proven on shipboard, aviation, military and orbital applications for leak detection.

Contact me for more information or check out our web-page in a couple of weeks

Joe


----------- Start Original Message -----------
: We have successfully tested penetrations using UE Systems ultrasonic leak testing equipment. We would place an ultrasonic tone generator on one side and scan for leakage on the other side. Several penetrations can be tested at one time using this method.
: We verified the process by making several mockups with pinhole leaks. Of course the testing is done prior to coating.
: John
: : A bulkhead penetration is basically a pipe passing through a steel ship's bulkhead. Once the pipe is welded and the weld is tested for watertightness (not for structural integrety), an electrical cable can then be passed through the penetration. Currently, two mechanics are required to test the penetration.One mechanic routes an air hose to one side while the other carries a bucket of soap suds with a brush to the other side of the bulkhead. Air is applied on one side and the other mechanic applies the soap and looks for bubbles. This is a two man operation which take a lot of time. Does anyone know of a simple (shipyard mechanic simple) means of testing a weld on one side of a bulkhead for watertight integrety (looking for holes in the welds only? The penetrations are normally 1 to 3 inches in diameter.
------------ End Original Message ------------




 
 Reply 
 
Simon Amallraja
Simon Amallraja
08:45 Jul-14-2006
Re: weld testing bulkhead / deck penetrations
----------- Start Original Message -----------
: A bulkhead penetration is basically a pipe passing through a steel ship's bulkhead. Once the pipe is welded and the weld is tested for watertightness (not for structural integrety), an electrical cable can then be passed through the penetration. Currently, two mechanics are required to test the penetration. One mechanic routes an air hose to one side while the other carries a bucket of soap suds with a brush to the other side of the bulkhead. Air is applied on one side and the other mechanic applies the soap and looks for bubbles. This is a two man operation which take a lot of time. Does anyone know of a simple (shipyard mechanic simple) means of testing a weld on one side of a bulkhead for watertight integrety (looking for holes in the welds only? The penetrations are normally 1 to 3 inches in diameter.
------------ End Original Message ------------

Zetec has made special probes for these kind of application. Log on to www.zetec.com or mail to kevin.archer@zetec.com - product specialist will help you for this application.

Simon Amallraja.


 
 Reply 
 

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