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- since 1996 -
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Technical Discussions
ras
ras
06:56 Aug-12-2008
oxie layer measurment in boiler tube

pls inform proceduer to measure thickness of oxide layer through A-Scan instrument thickness gauge step by step for above measurment please also inform what display and where cursor to be set/gate


    
 
 Reply 
 
Tom Nelligan
Engineering,
retired, USA, Joined Nov 1998, 390

Tom Nelligan

Engineering,
retired,
USA,
Joined Nov 1998
390
09:11 Aug-12-2008
Re: oxie layer measurment in boiler tube
The specific answer to your question depends on which gage and transducer you are using. Please provide that additional information. If you're using Panametrics-NDT products I can help with the setup, and if you're using something from one of our competitors perhaps someone from that company can step in.

In general, you will always measure from the echo representing the steel/oxide boundary to the echo representing the inside of the oxide layer, so gates are set for detection of those echoes. Some typical waveforms can be found in the application note at the link below.


----------- Start Original Message -----------
: pls inform proceduer to measure thickness of oxide layer through A-Scan instrument thickness gauge step by step for above measurment please also inform what display and where cursor to be set/gate
------------ End Original Message ------------




    
 
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RickyOng88
Director, -
ASNT, Singapore, Joined Aug 2008, 12

RickyOng88

Director, -
ASNT,
Singapore,
Joined Aug 2008
12
05:34 Aug-14-2008
Re: oxie layer measurment in boiler tube
----------- Start Original Message -----------
: pls inform proceduer to measure thickness of oxide layer through A-Scan instrument thickness gauge step by step for above measurment please also inform what display and where cursor to be set/gate
------------ End Original Message ------------
Whether the Boiler is Fired Tube or Water Tube the best method to be used for measuring the whole length of tube (except bends) is by Internal Rotary Inspection System (IRIS). Spot ultrasonic thickness measurement not good method for boiler tubes only area you could access.



    
 
 Reply 
 
David Hermanutz
Consultant,
Hbndt.com, China, Joined Jul 2012, 85

David Hermanutz

Consultant,
Hbndt.com,
China,
Joined Jul 2012
85
02:50 Aug-21-2008
Re: oxie layer measurment in boiler tube
----------- Start Original Message -----------
: : pls inform proceduer to measure thickness of oxide layer through A-Scan instrument thickness gauge step by step for above measurment please also inform what display and where cursor to be set/gate
: Whether the Boiler is Fired Tube or Water Tube the best method to be used for measuring the whole length of tube (except bends) is by Internal Rotary Inspection System (IRIS). Spot ultrasonic thickness measurement not good method for boiler tubes only area you could access.
------------ End Original Message ------------

The Olympus NDT / Panametrics 37DL Plus has a feature that handles this, please contact your local sales rep and they can show you the way out of your dilemma.

Regards,

David Hermanutz
www.HBNDT.com




    
 
 Reply 
 
RickyOng88
Director, -
ASNT, Singapore, Joined Aug 2008, 12

RickyOng88

Director, -
ASNT,
Singapore,
Joined Aug 2008
12
07:11 Aug-22-2008
Re: oxie layer measurment in boiler tube
----------- Start Original Message -----------
: : pls inform proceduer to measure thickness of oxide layer through A-Scan instrument thickness gauge step by step for above measurment please also inform what display and where cursor to be set/gate

: If you only want to measure thickness of oxide layer try using coating thickness gauge, we use it on stainless steel cladded to steel plate for production oil tanker. We tried using "A" Scan but failed.
------------ End Original Message ------------

Whether the Boiler is Fired Tube or Water Tube the best method to be used for measuring the whole length of tube (except bends) is by Internal Rotary Inspection System (IRIS) an ultrasonic method, as well.

Maybe I misunderstood you for wanted to measure boiler tube thickness.


    
 
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