where expertise comes together - since 1996 -

The Largest Open Access Portal of Nondestructive Testing (NDT)

Conference Proceedings, Articles, News, Exhibition, Forum, Network and more

where expertise comes together
- since 1996 -

570 views
Technical Discussions
Miguel Suarez Arana
Engineering
Servipetrol, Bolivia, Joined Sep 2002, 1

Miguel Suarez Arana

Engineering
Servipetrol,
Bolivia,
Joined Sep 2002
1
00:27 Sep-25-2002
ASME B&PV Secc V Art. 2 and 22

There is a possible misunderstanding in the interpretation for the appropriate IQI selection when using double wall-double image technique which states in the Art. 2 that the IQI selection has to be done based in the single wall and a sketch showing this is contained in the 95 Ed. and in the 98 Ed. Add. 2000, while in the former this was cleared in the Art. 22 (e 747) stating to be careful when exposing DW/DI there has to be selected the IQI bases in the double wall, the latter edition does not states this, probably for the respect to the original ASTM standard (the title also was changed here).
Our concern is that , being well versed in the RT technology, we consider that omitting a clear up confusess some inspectors not familiar with the RT in this special case.
We would appreciate very much if you agree with us in using the IQI based in the double wall thickness only for the DW/DI technique


 
 Reply 
 
Juan Amado
Engineering, Inspection
Arco Industrial, S.A., Panama, Joined Nov 2001, 44

Juan Amado

Engineering, Inspection
Arco Industrial, S.A.,
Panama,
Joined Nov 2001
44
00:10 Sep-27-2002
Re: ASME B&PV Secc V Art. 2 and 22
We have performed many RT inspections utilizing the DW/DI technique, and have always managed to comply with the IQI wire diameter apropiate for the single wall thickness. Furthermore, it makes sense that the IQI selection be based on the single wall thickness because since the weld being evaluated is equivalent to only one wall of the pipe, the indications to be detected must be in the range of only one wall thickness. The difficulty with the method stems from the fact that there is added distance between the side of the pipe that is far from the film thus making it more difficult to show the appropiate wire image on the radiograph. The only way to mitigate this effect is to increase the source to object distance. For tubes of 2" to 3" nominal diameter we have found a 24" to 30" source to object distance yields good results.

: There is a possible misunderstanding in the interpretation for the appropriate IQI selection when using double wall-double image technique which states in the Art. 2 that the IQI selection has to be done based in the single wall and a sketch showing this is contained in the 95 Ed. and in the 98 Ed. Add. 2000, while in the former this was cleared in the Art. 22 (e 747) stating to be careful when exposing DW/DI there has to be selected the IQI bases in the double wall, the latter edition does not states this, probably for the respect to the original ASTM standard (the title also was changed here).
: Our concern is that , being well versed in the RT technology, we consider that omitting a clear up confusess some inspectors not familiar with the RT in this special case.
: We would appreciate very much if you agree with us in using the IQI based in the double wall thickness only for the DW/DI technique
.



 
 Reply 
 

Product Spotlight

A1525 SOLO

A1525 Solo – the most compact and affordable TMF unit with two phased array transducers and 3D v
...
isualization and analysis software in standard delivery set. A compact, ergonomic and easy to handheld Phased Array unit based on Total Focusing Method for easy-going imaging of inspection objects with two-dimensional and three-dimensional visualization and evaluation of inspection results.
>

ISAFE3 Intrinsically Safe Sensor System

ISAFE3 intrinsically safe sensor system of Vallen Systeme is especially targeted at the petrochemica
...
l - as well as oil and gas transportation industry. The sensor system is designed for permanent monitoring or periodic inspection tasks. Sensors are available for different AE-frequency ranges optimized for corrosion and fatigue crack detection and other applications. The ISAFE 3 sensor system consists of an AE-sensor (model ISAS3) certified according to ATEX/IEC for installation in zone 0, gas group IIC, IP68, 20 to +60 °C, and a signal isolator (model SISO3) certified for installation in zone 2. An ISAS3 sensor can be mounted in atmosphere or submerged, e.g. in water or crude oil. It is supported by mounting tools for temporary (magnets) or permanent (welded) installation. ISAFE3 supports automatic sensor coupling test and can be used with any AE signal processor supporting 28V supply at 90 mA peak, e.g. Vallen Systeme ASIP-2/A.
>

On Demand Webinar: Improve the Efficiency and Accuracy of Inspection Scanning

On-demand webinar on scanning technology that helps improve the efficiency and accuracy of ultrasoni
...
c inspections in oil and gas, aerospace, manufacturing and other industrial applications. The webinar features a scanning solution for multiple inspection environments, including flat and curved specimens, magnetic and nonmagnetic surfaces and raster scanning over long distances. View it today.
>

Robotic laser shearography enables 100% inspection of complex, flight-critical composite structures

An article in “Composites World Magazine” showcases Non Destructive Testing of aero-structures
...
with Laser Shearography. Over the years Dantec Dynamics has supplied many solutions for the aerospace industry. Referring to specific customer projects several of these cases are examined to outline the advantages of using Laser Shearography for automated defect detection.
>

Share...
We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info
Accept
top
this is debug window