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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




 
 Reply 
 
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 ------------




 
 Reply 
 
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




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

John O'Brien

Consultant, -
Chevron ETC ,
USA,
Joined Jan 2000
280
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.


 
 Reply 
 

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