By Eng. Carlos F Molina
Liquid penetrant examination is a NDE technique used many situations. It is an effective means for detecting discontinuities which are open to the surface of nonporous metals and other materials. Typical discontinuities detectable by this method are cracks, seams, laps, cold shuts, laminations, and porosity. In fillet welds of big size (you define big size), it can be used in several stages to make an approximation to a volumetric NDE. It is better used if applied to the root pass of containment welds.
The Body of Knowledge for the API 653 exam (there is a new BOK here) says the following:
By Carlos F Molina
In the Body Of Knowledge for the API 653 exam, Ultrasonic Testing is one of the smallest parts that needs to be studied. This is what the Body Of Knowledge says you need to get:
E. Article 23, Ultrasonic Standards, Section SE–797 only – Standard practice for measuring thickness by manual ultrasonic pulse-echo contact method:
The inspector should be familiar with and understand;
1. The Scope of Article 23, Section SE-797,
2. The general rules for applying and using the Ultrasonic method
3. The specific procedures for Ultrasonic thickness measurement as contained in paragraph 7.
By Carlos F Molina
This is my last article about radiology in tanks for readers who are studying for the API 653 exam. We will see
- Radiographic Technique
- Placement of IQIs
- Radiographic density
By Carlos F Molina
In this article we will be talking more on the subject of radiology in the ASME V code
NOTE: This article is half of what originally was intended to be. It turns out that, as usual, good research takes a lot of time and as consequence, articles end up being longer and not reader-friendly. So I trimmed out the info and I am resizing with the info needed by API 653 readers.
There is 1 characteristic of a good radiograph that you should control:
By Carlos Molina
This time we are going to check radiographic testing for welds in new tanks, an introduction. The BOK for the API 653 exam says:
2. Radiographic Examination:
The inspector should be familiar with and understand:
1. The Scope of Article 2 and general requirements [of ASME V].
2. The rules for radiography as typically applied on butt welded AST horizontal and vertical seams such as, but not limited to:
required marking type.
selection.
number, and placement of IQIs.
allowable density control of backscatter radiation
location markers
3. Records
I will try to simplify this subject as much as posible for the people who is studying for the API 653 exam. (more…)