Volume 4, Number 2		April 2005

 

 

 

Q.	I understand that NAS 410 now requires Level II inspectors to recertify every five years. Why is my Level III requiring me to recertify after three years?  J.H., Cleveland, Ohio
A.	Your company’s written practice may require three year recertification intervals, possibly to meet the recommended maximum recertification period for Level IIs per SNT-TC-1A. Also, many customers still require recertification intervals to be every three years
Q.	What is a “penetrameter verification” shot in radiography of a weld?  T.B., Mobile, Alabama
A.	When part configuration will not allow penetrameter placement in the area of interest or an adjacent area, a penetrameter is placed directly on the weld and a radiograph is produced. The penetrameter is removed and another radiograph is made of the same area. This is only allowed when documented by an approved technique.
Q.	In the past, I always measured white light intensity in footcandles (ftc). Then, I had to measure in lux (lx). I now am being asked to measure in footlamberts (fL) as well. What is the difference and why do I have to do this?  M.M., Phoenix, Arizona
A.	Footcandle and lux are illuminance measurements (photometric flux per unit area) typically taken using a cosine corrector or a detector with a broad field of view. Illuminance varies in inverse proportion to the square of the distance. Footlambert and candela per square meter (cd/m2) are luminance measurements (flux density per solid angle) typically taken with a small aperture or small viewing area. Luminance measurements are independent of distance as the sampled area increases with distance. Units used vary according to customer requirements.
Q.	Is hardness testing considered NDT?  G.M., Victoria, Australia
A.	Hardness testing is usually considered complementary to NDT because hardness tests are used to determine a different set of conditions than are detected by NDT. Typical hardness tests alter the region being tested by plastic deformation. It is not commonly classified as a nondestructive test.
TNT reader responds to query in January issue. In the January 2005 issue of TNT, there was a question from E.H of Burbank, CA about redness of the hands after working in MT. Having been around and working in MT for the last 30 years I’ve found that carbolated salve works very well in clearing up the redness and the rashes that sometimes occur when one is in contact with MT carriers for an extended period of time. Hope this is of help.  T.D., Indianapolis, Indiana

E-mail, fax or phone questions for the Inbox to the Editor:
hhumphries@asnt.org
(800) 222-2768 X 206
(614) 274-6899 fax
 

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