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- since 1996 -

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Technical Discussions
Rudy Jaramillo
Student,
Chile, Joined Mar 2013, 2

Rudy Jaramillo

Student,
Chile,
Joined Mar 2013
2
15:14 Mar-20-2013
ultrasonic inspection in dual interface materials

Very good morning

I need information on how to inspect a pipe that is comprised of two different materials (double layer). Its outer layer is steel and the inner layer is polyurethane, thickness 10 mm both surfaces. I need to know how to inspect the polyurethane layer.

Attentive to your comments, best regards.

Rudy Jaramillo

 
 Reply 
 
Manuel Haces
Director, - Wire rope inspection
Haces Inspección del Noreste and Wire Rope Inspection, Mexico, Joined Jun 2002, 125

Manuel Haces

Director, - Wire rope inspection
Haces Inspección del Noreste and Wire Rope Inspection,
Mexico,
Joined Jun 2002
125
17:49 Mar-20-2013
Re: ultrasonic inspection in dual interface materials
In Reply to Rudy Jaramillo at 15:14 Mar-20-2013 (Opening).

Have a look at Olympus, they have an special transducer and works quite fine on rubber over steel. Regards

1
 
 Reply 
 
Tom Nelligan
Engineering,
retired, USA, Joined Nov 1998, 390

Tom Nelligan

Engineering,
retired,
USA,
Joined Nov 1998
390
18:28 Mar-20-2013
Re: ultrasonic inspection in dual interface materials
In Reply to Manuel Haces at 17:49 Mar-20-2013 .

Just to avoid confusion from the message above, we at Olympus NDT have several transducer solutions for measurement of polyurethane or rubber over steel and also for checking the bonding. However it is a very different situation when you are trying to test a highly attenuating, low acoustic impedance material like polyurethane *through* steel, because most of the sound energy reflects from the steel backwall and sets up strong multiple echoes that interfere with any echoes from the polymer liner. The short answer is that it is usually impractical without employing advanced techniques like digital wave subtraction or attempting a pitch/catch test with custom angle beams. In my experience neither technique is used outside laboratories.

1
 
 Reply 
 
Manuel Haces
Director, - Wire rope inspection
Haces Inspección del Noreste and Wire Rope Inspection, Mexico, Joined Jun 2002, 125

Manuel Haces

Director, - Wire rope inspection
Haces Inspección del Noreste and Wire Rope Inspection,
Mexico,
Joined Jun 2002
125
19:15 Mar-20-2013
Re: ultrasonic inspection in dual interface materials
In Reply to Tom Nelligan at 18:28 Mar-20-2013 .

Rudy, follow what Tom suggest, he had gave me good solutions from different situacions. Regards to both.

1
 
 Reply 
 
Rudy
Student,
Chile, Joined Mar 2013, 2

Rudy

Student,
Chile,
Joined Mar 2013
2
15:30 Mar-24-2013
Re: ultrasonic inspection in dual interface materials
In Reply to Tom Nelligan at 18:28 Mar-20-2013 .

Hi Tom and Manuel, thanks for the info, will have practical information on how to measure thickness in double-layer pipes (steel-polyurethane) using a single crystal transducers and normal incidence.

best regards

 
 Reply 
 

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