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Technical Discussions
daniel iordache
daniel iordache
06:21 May-07-2004
tank's plate lamination- evaluation

hello.
does anyone know how to evaluate laminations that where found in first course of 30000 bls oil storage tank .

subject oil storage tank -30000 bls

first course content 12 plates-

for each one at ut survey have been found 7-20 areas affected by lamination wide fro 20 x20mm to 800 x 500mm at depthes from 5 to 10 mm - nominal thickness is 14-15mm.

is rejected or accepted
-i will send the original report

thanks daniel




    
 
 
Richard Kazares
Richard Kazares
07:41 May-07-2004
Re: tank's plate lamination- evaluation
The issue with laminations - is not necessarily that they exist - there are many tanks and other structures with delaminations present. The issue is "Do they connect in some way?" I.E. do the seperate parallel delaminations - have "tentacles" that span the perpendicular directions between the individual delaminations.

There are UT techniques to determine if they are present - and the presence of those tentacles can GREATLY weaken the structure. Delaminations on their own, may be OK.

Hope that helps a little.


----------- Start Original Message -----------
: hello.
: does anyone know how to evaluate laminations that where found in first course of 30000 bls oil storage tank .
: subject oil storage tank -30000 bls
: first course content 12 plates-
: for each one at ut survey have been found 7-20 areas affected by lamination wide fro 20 x20mm to 800 x 500mm at depthes from 5 to 10 mm - nominal thickness is 14-15mm.
: is rejected or accepted
: -i will send the original report
: thanks daniel
------------ End Original Message ------------




    
 
 
Milt Deck
Milt Deck
06:49 May-10-2004
Re: tank's plate lamination- evaluation
To comment on the problem we would like to see the original report.
RANGER Inspection Ltd specializes in UT services and tank inspections.

Regards
Milt Deck




    
 
 
John O'Brien
Consultant, -
Chevron ETC , USA, Joined Jan 2000, 278

John O'Brien

Consultant, -
Chevron ETC ,
USA,
Joined Jan 2000
278
02:31 May-11-2004
Re: tank's plate lamination- evaluation
Look at API RP 579 Fitness For Service Section 7.

Level 1 a Lamination is acceptable regardless of size so long as it is more than 1.8 x Square Root of D (inside Shell diameter) x tnom (where tnom is the nominal wall thickness)

If you need more specific assistance or an independnet evaluation please contact us.


    
 
 

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