Location: NDT.org
Information
Message Boards
Jobs and Employment
ndt level II utrasonic/mt/pt inspector
radiographic testing for spherical tank
Search:

Reply to this post.

See the new forums at http://forums.ndt.org.
Title:

radiographic testing for spherical tank
From:

Vietnam
Email:

thoinh@yahoo.com
URL:

http://
Added:

7/5/2001 7:03:31 AM
Message:

firstly, thank you very much for your interest in this page. My name: Nguyen Huu Thoi My occupation: RT, UT, MT, PT inspector level II. Now, my company have a job: Dung Quat Refinery project. In this project, there are 6 spherical tank need to carry out RT. So the thickness is very large: 55 to 80mm. In Vietnam, RT equipment used: Gamma Source Ir 192, film used : AGFA D4/D7 or Kodak AA. I think that with this equipment and facilities, can not carry out RT for the above-mentioned, the film quality is too bad. So i send this page to every body that how to carry out NDT for this job. Once againe, thank you for your help. Regards

Posts:

William Blum
Posted:
7/5/2001 11:30:20 PM
Post Email: wblum@brighttechnical.com
Subject: RT
ASME Section V recommends minimum thickness limits for radioactive isotopes but states "The maximum thickness for the use of radioactive isotopes is primarily dictated by exposure time therefore upper limits are not shown." I suggest you shoot a test shot or two and see if you are achieving the required sensitivity. If so, it is a matter of the time necessary to make the shot. You can also post your question here http://www.ndt.net/wshop/forum/forum.htm and here www.asnt.org.
density is time linear
Posted:
9/23/2002 9:13:29 PM
Post Subject: time adjustment
While adding time will increase burn, scatter exposure, and decrease sensitivity somewhat, a simple adjustment in time as opposed to the inverse square law is far quicker and fairly accurate in field radiography. Quite simply if a one minute exposure gives a 1.0 reading, a 3 minute exposure will achieve a 3.0 density. The longer the exposure the less linear the time /density curve is constant, with the exposure acquiring a slighter higher % of density in relation to time, meaning if a 5 minute exposure produces a 1.0, a 15 minute exposure may produce a density reading slightly higher than 3.0 However this is incredibly accurrate with x-ray machines, both low and high energy, which can save time in developing techniques.

Reply to this post.

Evident NDT
mferentals.com
Acuren
Applus RTD
Arcadia Aerospace Composite Inspection Solutions
TEAM Industrial Services
Pine Environmental
MX Industrial
Cygnus Instruments
American Institute of Nondestructive Testing
Innovation Polymers for Nondestructive Testing
Iris Inspection Services
USI NDT
ATS
NVI NDT
AUT Solutions
Magnaflux
Eddyfi Technologies
Mistras Group
meditinc.com borescopes