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Technical Discussions
Nader A.Rahim
NDT Inspector
Gulf petrochmical ind. co., Bahrain, Joined Jul 2001, 3

Nader A.Rahim

NDT Inspector
Gulf petrochmical ind. co.,
Bahrain,
Joined Jul 2001
3
02:57 Jul-15-2001
cold insulation inspection

I am looking for the best method to inspect ice formation under Ammonia tanks ( double wall). the insulation is PUF with aluminum cladding ( the insulation is approx. 4" )

We been experminating with thermography but we can not establish a solid fact if ice is there or not




 
 Reply 
 
van Cuyck
Director
A2MS, Applied Acoustics, Materials and Systems, France, Joined Nov 1998, 13

van Cuyck

Director
A2MS, Applied Acoustics, Materials and Systems,
France,
Joined Nov 1998
13
09:39 Jul-16-2001
Re: cold insulation inspection
: I am looking for the best method to inspect ice formation under Ammonia tanks ( double wall). the insulation is PUF with aluminum cladding ( the insulation is approx. 4" )
.
: We been experminating with thermography but we can not establish a solid fact if ice is there or not
.


Can you send me a mare detailled description of your system. (configuration, equipements ...)




 
 Reply 
 
John O'Brien
Consultant, -
Chevron ETC , USA, Joined Jan 2000, 280

John O'Brien

Consultant, -
Chevron ETC ,
USA,
Joined Jan 2000
280
09:11 Jul-16-2001
Re: cold insulation inspection
You may not be able to be definitive about ice build up using Thermography. Breakdowns in insulation which you could then extrapolate as being a source of icing should be detectable. Be careful that outer aluminium cladding is not heating up and masking differences. We often used to do the Thermography just after the sun went down.

Other possible approach is something like Neutron Backscatter - but access will be the problem you will probably have to work off cherry pickers.

Best methodology may be to build a mock up of the arrangement and test your technique qith Thermography. Introduce ice and see how fine your settings have to be to maintain discriminations.


 
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