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Technical Discussions
S.Mohamed Riaz
S.Mohamed Riaz
08:56 Jan-25-2010
High temperature Lines - Radiography

Dear experts,

We have stream lines around 450'C - 600'C, we like to take radiography for measure actual thickness.Schedule thickness is 44mm and pipeline diameter is 30".

please help us to give your most valuable ideas, whether we can take radiography with special arrangements.

regards,
riaz

    
 
 Reply 
 
Nigel Armstrong
Engineering, - Specialist services
United Kingdom, Joined Oct 2000, 1096

Nigel Armstrong

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1096
13:29 Jan-25-2010
Re: High temperature Lines - Radiography
In Reply to S.Mohamed Riaz at 08:56 Jan-25-2010 (Opening).

Mohamed

A few ideas.

I take it you dont want to remove insulation and use a high temperature ultrasonic probe and couplant.

44mm wall thickness and 88mm penetrated thickness is on the margins for producing a measurable exposure by Iridium-192 profile radiography using a ball-bearing or the Rikki-T comparator.

To measure corrosion rate without shutting lines down there are means of hot tap and installation of measuring probes.

    
 
 Reply 
 
Roger Duwe
NDT Inspector, API-510, 570, 653
MISTRAS, USA, Joined Jan 2009, 148

Roger Duwe

NDT Inspector, API-510, 570, 653
MISTRAS,
USA,
Joined Jan 2009
148
22:51 Jan-25-2010
Re: High temperature Lines - Radiography
In Reply to Nigel Armstrong at 13:29 Jan-25-2010 .

In addition to the wall thickness to be penetrated, the curvature will give problems. Typically, profile RT is not used above about 12-inches OD due to the curvature. 30-inch pipe will not give results accurate to use for pressure calculations or measuring material loss.

High-temp couplant and UT-thickness are probably the best method. You only need a 50-75mm hole in the insulation, and it can be replaced with a plug of fiberous insulation -- Kaowool, Cerowool, or similar.

    
 
 Reply 
 
ligang feng
NDT Inspector,
China, Joined Jan 2010, 3

ligang feng

NDT Inspector,
China,
Joined Jan 2010
3
02:45 Jan-26-2010
Re: High temperature Lines - Radiography
In Reply to S.Mohamed Riaz at 08:56 Jan-25-2010 (Opening).

i am strongly agree with Nigel's ideas.

    
 
 Reply 
 
Syed Ali
R & D,
Innerspec Technology, USA, Joined Oct 2009, 17

Syed Ali

R & D,
Innerspec Technology,
USA,
Joined Oct 2009
17
05:45 Feb-01-2010
Re: High temperature Lines - Radiography
In Reply to S.Mohamed Riaz at 08:56 Jan-25-2010 (Opening).

Try exploring EMATs for high temperature thickness measurements. Please see for High Temperature EMATs and applications.

    
 
 Reply 
 

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