I have had a lot of people email and ask about the math formulas to calculate Radiographic Enlargement.
If you look in many of the handbooks and online you will mostly find very complicated formulas. In reality it is quite simple and just uses basic ratios. The formula below is for using a steel comparator ball but the math works the same if regardless.
Actual Pipe Wall = (Actual Ball Diameter ÷ Ball Diameter on Film) X Wall Thickness on Film
Divide the actual ball diameter or the length of the optical comparator by the measured apparent length of the comparitor on the film. Multiply this answer by the pipe wall thickness as measured on the film.
For accurate measurement the ball or comparator block must be put as near as possible to the exact side of the pipe parallel to the film so that the enlargement of the pipe wall is the same as that of the ball of block.
If the comparator or ball is not touching the pipe because of insulation, aim the source at the center of the space between the two, as shown in the drawing below. This will help insure an equal amount of enlargement to the ball and the pipe wall. (Think of how the source side of an elliptical 2” weld is distorted more than the film side)
If using a one inch diameter ball and the diameter measured on the film is actually 1.2 inches and the film wall measured on the film is 0.500”, the actual wall thickness is 0.416 inches.
Pipe Wall = ( 1” ÷ 1.2” ) X 0.500” Pipe Wall = 0.83 X 0.500”
Pipe Wall = 0.416”
Below is an Excel spreadsheet calculator that you can use.
Barricade calculator app has been updated to version 2.1 in the App Store.
It’s product page with app store link may be found in the following link;
This version adds the ability to add shielding in addition to the collimator. This can be added in inches rather than in the half-value layers. The default colimator is still added in half-value layers.
Other improvements include faster performance and retina graphics for the iPhone.
Ug Calc is a simple Geometric Unsharpness calculator for Industrial Radiography.
All you have to do is plug in the distance from the Object (source side of the object or weld) to the film and to the source distances, along with the source size (diagonal).
This is not a difficult calculation to make but using this app makes it simpler and no need to keep looking up formulas.
NOTE: The source side of the object or weld on double wall exposure welds with Single Wall viewing is the inside surface of the pipe near the film. Basically the wall thickness (and maybe reinforcement).
On other welds it is more obvious where the source side of the object or weld is.
Click on the image below to enlarge.
Example problem: What is the Ug when the weld to film distance is 0.5 inches and the weld to source distance is 8 inches with a source size of 0.180 inches?
Answer: 0.011 inches of Ug. (Ug = (0.5 x 0.180)/8)
Code 313 is a calculator for interpreting industrial radiographs in accordance with ASME B31.3.
Please read this description and watch the video below (Coming soon) before purchasing to decide if this is the app for you.
The app caculates the most common discontinuities such as cracks, incomplete penetration, internal porosity, slag inclusions, and undercutting.
It also calculates IQI (penetrameter) sizes. It has three sections, welds with no reinforcement, and welds reinforced on one or both sides.
NOTE: The calculations for welds with reinforcement are based on the MAXIMUM allowable reinforcement. The code references the “ESTIMATED” reinforcement, so use the numbers in the app with this in mind and as just references.
This app DOES NOT replace the code itself nor the need to have the code. There are many other issues in the code that need to be referenced, this is just a calculator. One common example is you need the porosity ccomparison charts from the code for reference and need to be able to reference the rules and conditions.
Use this app at your own risk. No guarantee is made. recommended use is as a second opinion to your own interpretation.
The 2.0 revision of X-Ray Timer has been approved by Apple and is in the App Store.
This revision added Se-75 as an Isotope selection. I used the values by the manufacturer for the radiation output and the published values for the shielding value of the steel. I don’t actually own any Selenium sources myself, but several people requested this feature.
I decided to go ahead and make this app free for the community. Sales dropped off enough to the point I wouldn’t really get paid anymore so I decided to make it free for everyone. Hopefully now it will be the new standard way work is done. Spread the work around.
I’m working on a Web App version for computer browsers and other smart phones.