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- since 1996 -

ZETEC, Inc.
Zetec is a global leader in nondestructive testing (NDT) solutions for the critical inspection needs of industries the world counts on every day, ...
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Technical Discussions
sandeep jaikishen
sandeep jaikishen
07:02 Jan-01-2004
Leakage of LPG cylinders

Hi

Sometimes we find LPG cylinders leaking around the circumferential weld during first filling at LPG bottling plants. Cylinders then sent to labs for failure analaysis. They carry out the leakage test with water and Pneumatic pressure. Most of the times, they could not establish any leakage from the same cylinders.

Why it happens and is their any better method, by which we can establish the leakage.



 
 Reply 
 
N.Kuppusamy
Consultant, NDT Level-III Engineer
Advanced Inspection & Testing (S) Pte Ltd, Singapore, Joined Dec 2003, 34

N.Kuppusamy

Consultant, NDT Level-III Engineer
Advanced Inspection & Testing (S) Pte Ltd,
Singapore,
Joined Dec 2003
34
00:25 Jan-02-2004
Re: Leakage of LPG cylinders
Hello,

Happy New Year to every body. You can advise your lab to perform hologen leak testing or Mass Spectrometer Test. These leak testings are more sensitive than others.

Regards,
N.Kuppusamy

----------- Start Original Message -----------
: Hi
: Sometimes we find LPG cylinders leaking around the circumferential weld during first filling at LPG bottling plants. Cylinders then sent to labs for failure analaysis. They carry out the leakage test with water and Pneumatic pressure. Most of the times, they could not establish any leakage from the same cylinders.
: Why it happens and is their any better method, by which we can establish the leakage.
------------ End Original Message ------------




 
 Reply 
 
Mike
NDT Inspector
Materiaal Metingen Holland, Netherlands, Joined Oct 1999, 2

Mike

NDT Inspector
Materiaal Metingen Holland,
Netherlands,
Joined Oct 1999
2
04:59 Jan-03-2004
Re: Leakage of LPG cylinders
----------- Start Original Message -----------
: Hi
: Sometimes we find LPG cylinders leaking around the circumferential weld during first filling at LPG bottling plants. Cylinders then sent to labs for failure analaysis. They carry out the leakage test with water and Pneumatic pressure. Most of the times, they could not establish any leakage from the same cylinders.
: Why it happens and is their any better method, by which we can establish the leakage.
------------ End Original Message ------------


You could try a dye penetrant test on the weld and surrounding area. This would probably be the cheapest option and quite easy. Any paint would have to be removed first.



 
 Reply 
 
Suleyman Halicioglu
Suleyman Halicioglu
08:00 Jan-05-2004
Re: Leakage of LPG cylinders
----------- Start Original Message -----------
: : Hi
: : Sometimes we find LPG cylinders leaking around the circumferential weld during first filling at LPG bottling plants. Cylinders then sent to labs for failure analaysis. They carry out the leakage test with water and Pneumatic pressure. Most of the times, they could not establish any leakage from the same cylinders.
: : Why it happens and is their any better method, by which we can establish the leakage.
:
: You could try a dye penetrant test on the weld and surrounding area. This would probably be the cheapest option and quite easy. Any paint would have to be removed first.
------------ End Original Message ------------

You should clean the weld and HAZ by brush or similar method and try a magnetic particle test, by yoke or prod type. You should perform the pneumatic test under water.


 
 Reply 
 
ALBERTO MONICI
Engineering, Leak Detection Service - Thermography Service -
ETS Sistemi Industriali, Italy, Joined Aug 2002, 17

ALBERTO MONICI

Engineering, Leak Detection Service - Thermography Service -
ETS Sistemi Industriali,
Italy,
Joined Aug 2002
17
00:06 Jan-05-2004
Re: Leakage of LPG cylinders
Hi, and Happy New Year to everybody!
The Pneumatic and Water Leak Test are able to find gross leak (more than 1*10-3 std cc/sec, in normal industrial labs application). For Leak below this value, you can find a pressure decreases but it is very difficult to localize the leak.
Also I suggest you to use Leak Detector in sniffer mode. I suggest to utilise Helium Leak Detector because Helium is a Noble Gas. More normatives (ASNT or EN) permit you to certify also the quantity of leaks with personnel qualified II level or more.
Our company furnish consultancy, automatic systems and services for Leak Test.
Alberto Monici
ETS Sistemi Industriali
Italy
----------- Start Original Message -----------
: Hello,
: Happy New Year to every body. You can advise your lab to perform hologen leak testing or Mass Spectrometer Test. These leak testings are more sensitive than others.
: Regards,
: N.Kuppusamy
:
: : Hi
: : Sometimes we find LPG cylinders leaking around the circumferential weld during first filling at LPG bottling plants. Cylinders then sent to labs for failure analaysis. They carry out the leakage test with water and Pneumatic pressure. Most of the times, they could not establish any leakage from the same cylinders.
: : Why it happens and is their any better method, by which we can establish the leakage.
------------ End Original Message ------------





 
 Reply 
 
HaccpMTC grp
HaccpMTC grp
08:00 Aug-09-2004
Re: Leakage of LPG cylinders
hi to every body

we are looking for the test system used to test the lpg cylinders e.g hydrostatic test system,ultrasonic test system ,corrossion test system and the valve test system.
looking for cooperation

Atif A.G.othman
g.director



 
 Reply 
 

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