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 -

GE Inspection Technologies
Inspection Technologies, a business of the Baker Hughes, a GE company (BHGE IT), is one of the world's leading suppliers of nondestructive testin ...
346 views
Technical Discussions
John
John
04:31 Mar-25-2004
ASME Cal Blocks

When would you use the 2% notches on the ASME cal blocks? Are they there for comparing to undercut signals?

Is there ever a time when they are used when constructing the DAC?

John


 
 Reply 
 
Ed T.
Ed T.
08:37 Mar-25-2004
Re: ASME Cal Blocks
----------- Start Original Message -----------
: When would you use the 2% notches on the ASME cal blocks? Are they there for comparing to undercut signals?
: Is there ever a time when they are used when constructing the DAC?
: John
------------ End Original Message ------------

According to ASME Sec. V 2000, Articles, 4 & 5, 2% notches are used for vessel examinations. Side drilled holes are generally used for DAC construction for vessel calibrations with the notch location and amplitudes marked on the screen.
ASME Sec. V, Article 4, B-465 discusses the amplitude responses from square notches at the opposite side of the block from various angles. B465.2 states that a 45º shear wave angle may give you an indication of 2-1 above DAC on a square notch, whereas a 60 º may give you an indication of only ½ DAC and that indication from that notch shall be considered when evaluating reflectors at the opposite surface.
Notches are used for calibration of piping and tubing materials. Now depending on which article you are using, whether it is Article 4 or Article 5, the notch sizes vary and will be used for DAC construction. Side drilled holes may be used provided you can demonstrate equivalent or greater sensitivity than that produced by notches.
Article 4, requires notches to be between 8%t and 11%t. Article 5 requires notches to be 5%t or 0.004”, whichever is greater.



 
 Reply 
 

Product Spotlight

Surf-X® Array Probe

Introducing the Surf-X family of flexible Eddy Current Array (ECA) probes. Featuring unique multiple
...
coil sets and proprietary X-PROBE technology, Surf-X array probes can quickly and accurately handle a range of inspection applications, from inspecting corrosion or cracking in pipes, pressure vessels, or tanks, to assessing and sizing cracks in raised welds and friction stir welds.
>

FMC/TFM

Next generation for Phased Array UT is here now with FMC/TFM! Have higher resolution imaging, impr
...
oved signal to noise ratio, characterize, size and analyze defects better with access to several wave mode views and save raw FMC data for higher quality analysis.  Some of the benefits are:
  • Beautiful Image! Easier to understand what you're looking at
  • Completely focused in entire image or volume
  • Much easier to define setups before inspection
  • Easier to decipher geometry echoes from real defects
  • Oriented defects (e.g. cracks) are imaged better
  • See image from different wave modes from one FMC inspection
  • FMC data can be reprocessed/analyzed without going back to the field
>

NOVO Armor 15 & NOVO Armor 22

The Armor Kit Contains the NOVO Armor, which provides additional mechanical protection to the NOVO 1
...
5WN & NOVO 22WN Detectors, the Armor Stand and a traveling soft cover. - Newest shock absorbent technology case - Water resistant design - Supports wired & wireless communication - Multiple positioning options - Tripod connection using the Built-in 1/4” threads - Simple Detector battery replacement
>

Ultrasonic tomograph for imaging of concrete structures А1040 MIRA

Applicable for concrete inspection allowing imaging of the internal structure of objects from conc
...
rete, reinforced concrete, different stones. The operation applies pulse-echo technique at one-side access to the object. The instrument is feasible for concrete inspection for searching conduct ducts, conduits, detection of foreign inclusions, holes, honeycombing, cracks and other concrete defects.
>

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