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Technical Discussions 712 views 06:21 May-07-2004 daniel iordache 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 Post Reply      Translate            07:41 May-07-2004 Richard Kazares 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 ------------ Post Reply      Translate            06:49 May-10-2004 Milt Deck 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 www.rangerinspection.com Post Reply      Translate            02:31 May-11-2004 John O'Brien Consultant, - Chevron ETC , USA, Joined Jan 2000 278 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. Post Reply      Translate