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Technical Discussions
Debby Criel
Other, Inspection Engineer
Borealis, Belgium, Joined Oct 2013, 3

Debby Criel

Other, Inspection Engineer
Borealis,
Belgium,
Joined Oct 2013
3
11:54 May-05-2014
NDT of bottom of water tank

Hello I'm looking for a NDT technique for inspection of the bottom of a fire water tank which cannot be emptied. The using of divers is not possible due to the powerfull pumps that can be activated. Thank you for your answer!

 
 Reply 
 
Jon Wallis
NDT Inspector, -
Netherlands, Joined Feb 2010, 626

Jon Wallis

NDT Inspector, -
Netherlands,
Joined Feb 2010
626
12:47 May-05-2014
Re: NDT of bottom of water tank
In Reply to Debby Criel at 11:54 May-05-2014 (Opening).

If the tank can be opened this should be possible with immersion UT. Talk to one of the bigger NDT comanies or a company that is specialised in immersion UT.
I am assuming that you have no access from the outside of the tank as that is the most logical place to start. There are hands-off methods of determining the wall thickness of otherwise non-accessible objects like storage tanks such as Beetle or Pulsed Eddy Current.

 
 Reply 
 
HK Maddi
NDT Inspector,
Sievert Group of Companies, India, Joined Nov 2011, 14

HK Maddi

NDT Inspector,
Sievert Group of Companies,
India,
Joined Nov 2011
14
13:48 May-05-2014
Re: NDT of bottom of water tank
In Reply to Jon Wallis at 12:47 May-05-2014 .

OTIS May be an Option

 
 Reply 
 
Gary Woodside
Gary Woodside
11:42 May-06-2014
Re: NDT of bottom of water tank
In Reply to Debby Criel at 11:54 May-05-2014 (Opening).

We provide an inspection service to refineries and power stations using remote PTZ cameras to inspect the roof and a miniature ROV to inspect the walls and floor. Regards
Gary

 
 Reply 
 
Fedor Durnov
R & D, Head of R&D dpt.
ENGISS Ingenieurbüro GbR, Germany, Joined Jun 2010, 28

Fedor Durnov

R & D, Head of R&D dpt.
ENGISS Ingenieurbüro GbR,
Germany,
Joined Jun 2010
28
12:47 May-06-2014
Re: NDT of bottom of water tank
In Reply to Debby Criel at 11:54 May-05-2014 (Opening).

Anyway you need to have an access to the bottom. It can be direct access or only through water column.
First case is quite easy and I understood that it's not your case.
Second one is a little bit more difficult but still can be easy realised.
Water has a very low attenuation that's why the main problem is a keep acoustic axis perpendicular to bottom surface. But as I told there are a lot of possibilities to realise such device.
If you give some more information about the tank (sketch or draft) we can have further discussion about your task

 
 Reply 
 
Debby Criel
Other, Inspection Engineer
Borealis, Belgium, Joined Oct 2013, 3

Debby Criel

Other, Inspection Engineer
Borealis,
Belgium,
Joined Oct 2013
3
13:42 May-06-2014
Re: NDT of bottom of water tank
In Reply to Fedor Durnov at 12:47 May-06-2014 .


Fire water tank

Download Virus Scan recommended!

Dimensions of the tank:
Ø 15250 mm
h 11250 mm
content: 2055 m³ - water
thickness bottom plate = 7,85 mm
material: steel
inside coating: we don’t know
 
 Reply 
 
Harendra Latiyan
Harendra Latiyan
14:37 May-06-2014
Re: NDT of bottom of water tank
In Reply to Debby Criel at 13:42 May-06-2014 .

Hello,

Please refer to the link given below, it may be of your interest provided you are looking for monitoring over a long period of time, Please be informed that it describes about a monitoring technique rather than testing/inspection....
https://www.youtube.com/watch?v=ZjS8MHh7D5U

Regards

 
 Reply 
 
Fedor Durnov
R & D, Head of R&D dpt.
ENGISS Ingenieurbüro GbR, Germany, Joined Jun 2010, 28

Fedor Durnov

R & D, Head of R&D dpt.
ENGISS Ingenieurbüro GbR,
Germany,
Joined Jun 2010
28
21:43 May-07-2014
Re: NDT of bottom of water tank
In Reply to Debby Criel at 13:42 May-06-2014 .

I see it's quite a big. I need a little bit more information:
1. What is access to the tank. How a sensor can be drown to a water. Is it possible to move it in parallel to bottom flatness and keep it perpendicular to it?
2. What do you want to detect in bottom? Do you want to detect defects or just make thickness measurement. If defect, please specify a size of it.
3. It's very important to know about inside coating, because it can be a grate barrier for ultrasound.

 
 Reply 
 
Alberto Monici
Engineering, Leak Detection Service - Thermography Service -
ETS Sistemi Industriali, Italy, Joined Aug 2002, 17

Alberto Monici

Engineering, Leak Detection Service - Thermography Service -
ETS Sistemi Industriali,
Italy,
Joined Aug 2002
17
07:21 May-08-2014
Re: NDT of bottom of water tank
In Reply to Debby Criel at 11:54 May-05-2014 (Opening).

Dear Debby,
If the tank can stay at rest for about 20 hours, You can certify the tank floor utilizing Acoustic Emission Test thanks to EN normative EN-15856 dedicated exactelly for this type of tank, also in presence of coating. For further information you can contact me or in your Country directelly Vallen Systems in Icking.
Alberto

 
 Reply 
 

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