NDT News

How Low Temperatures Impact Dye Penetrant Testing

In this article, we look at how lower inspection temperatures affect the performance of dye penetrant testing cleaners, penetrant and developers

The operating temperature range for penetrant inspection as specified in ASTM E1417 Standard Practice for Liquid Penetrant Testing is 40°F to 125°F (4°C to 52°C), but how is the penetrant inspection affected at temperatures below 40°F (4°C) and can the inspection process be adjusted to achieve acceptable results?

To answer these questions, we evaluated SKC-S cleaner/remover, SKL-SP2 solvent removable dye penetrant and SKD-S2 non-aqueous developer at a range of temperatures in order to figure out what NDT inspectors can expect when using these, or similar quality dye penetrant products when inspecting at lower temperatures

Cleaning at lower temperatures

At lower temperatures in the range of 32°F – 50°F (0°C – 10°C), the solvent cleaner will take longer to dry.

We used 75°F (24°C) as our ambient, standard operating temperature, and observed how decreasing temperatures impacted how quickly the solvent cleaner dried. Below are our suggested drying time for solvent-based cleaner/removers at lower temperatures.
 

TemperatureCleaner Drying Time
75°F / 24°C Standard
50°F / 10°C 2 x Standard
40°F / 4°C 3 x Standard
32°F / 0°C 4 x Standard

It is critical to make sure the solvent has evaporated during the precleaning step either by wiping with a clean, lint free cloth or using air dryers to ensure a clean and dry part prior to penetrant application. Unevaporated cleaner remaining in indications can impede penetrant entry into the surface breaking indications.

Dwelling at lower temperatures

Penetration time should also be extended since the viscosity of penetrant increases with decreasing temperatures, which slows down penetration and can significantly impact the test results.
 

TemperatureDwell Time
75°F / 24°C Standard
45°F / 7°C 2 x Standard
32°F / 0°C 2.5 x Standard

Developer at lower temperatures

Developer drying time is more of a challenge and our tests showed the developing action is impeded because of the slower solvent evaporation. When the developer dries, the indications become fuzzy or show excessive bleed out.

Penetrant Developer

We were not able to get good results at 32°F (0°C) because the developer remained wet and did not dry within a reasonable amount of time. At 38 – 40°F (3 – 4°C), and with some air movement, developer film will dry at 5 times the standard time at 75°F (24°C).
 

TemperatureDeveloper Drying Time
75°F / 24°C Standard
40°F / 4°C 5 x Standard

A positive note is at low temperatures, we found good indications with extremely small and tight defects. The slow drying rate of the developer film allows greater bleed out of the penetrant from the defect. For large defects, longer development time caused excessive bleed out making indication interpretation more difficult.


Contact us if you need more help assessing your low temperature dye penetrant application, or have any questions on additional products for dye or liquid penetrant testing

Do you have any tips for low temperature dye penetrant testing or other non-destructive testing?
Share your ideas in the comments section below.

Source: https://magnaflux.com/Magnaflux/Blog/Low-Temperature-Dye-Penetrant-Testing?utm_source=linkedin&utm_medium=social&utm_campaign=Education&utm_content=Low-Temp-Dye-Penetrant

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9 Transparently Amazing Facts About X-Rays

9 Transparently Amazing Facts About X-RaysIn 1895, Wilhelm Roentgen, a professor of Physics in Worzburg, Bavaria, was the first to find a way to peer inside the body without surgery. On the evening of November 8, he was experimenting with the conduction of electricity through low-pressure gases using an induction coil and a partially-evacuated glass tube when he accidentally discovered a mysterious ray capable of lighting up a fluorescent screen a few meters away.

On the evening of November 8, he was experimenting with the conduction of electricity through low-pressure gases using an induction coil and a partially-evacuated glass tube when he accidentally discovered a mysterious ray capable of lighting up a fluorescent screen a few meters away.

When he passed his hand between the ray and the screen, he glimpsed a shadow of his own bones. Further experimentation showed that the screen could be replaced by a photographic plate—and the x-ray was born. Roentgen would later earn the first Nobel Prize in physics for his discovery.

http://mentalfloss.com/article/70900/9-transparently-amazing-facts-about-x-rays

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Corporate NDT Training

Corporate NDT TrainingThe American Institute of Nondestructive Testing (AINDT) offers online and hands-on training for your company. Simply set up a corporate account with us for easy billing and additional discounts. All individual classes include study material, access to our online learning system, and instructor support via phone, video conference and/or email. Our online Level I and II final exams are fully proctored by Examity online proctoring services to ensure the highest level of integrity for your company's training needs. Unlike most NDT schools we have no minimum class size or limited training schedules. We will work with your schedule to get you the training you need. We are a fully-staffed NDT school, offering training in UT, RT, MT, PT, VT and radiation safety. Our 6,200 square foot facility includes all the equipment and flawed specimens you'll need to complete your hands-on training. Call us today (855) 313-0325 and we will work with you to customize an NDT program fits your budget and schedule!

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Personalized Hybrid Training School

If you are considering a new career in nondestructive testing, contact AINDT today. We are a personalized hybrid training school for nondestructive testing, that prides itself in top-notch education, a state-of-the-art facility, great relationships with top employers in the NDT industry, and more. AINDT is individualized—we take great strides to personally get to know each student--not only their learning style but their goals for a new career path. We are not a high-pressure sales company. We are passionate about what we do, and we do it well. You won't get an automated voicemail system. Our instructors are on hand to personally take your calls and answer all your questions. At AINDT, we want you to know our school, understand the career field of nondestructive testing, and make the right choice for you and your life. You will love your new career with NDT. Call us today to get started: (855) 313-0325 or visit us on the web at www.trainingndt.com

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Corrosion Under Insulation: The 7 Inspection Methods You Must Know About

Melissa Syvrais | Apr 14, 2016
https://www.linkedin.com/pulse/corrosion-under-insulation-7-inspection-methods-you-must-syvrais-1

April 4, 2016 - Author: Charles Tremblay

As we discussed in our previous article, corrosion under insulation (CUI) is one of the most difficult corrosion processes to prevent. The reason for that is, by and large, no matter the precautions taken, water invariably seeps into the insulation and begins its dirty work—sometimes unseen until process leakage occurs. Data shows that about 60% of pipe leaks are caused by CUI. That’s not good.

CUI is difficult to find because the insulation covers the corrosion problem until it is too late. Removing insulation, inspecting, and then reinstating the insulation after inspection is an expensive process. Inspecting without removing insulation and weather jackets greatly reduces the cost of inspections. Non-destructive testing methods to detect CUI in such a way is therefore a major benefit to the industry.

There are a number of methods used today to inspect for CUI. No one method is ever used by itself—several methods complement each other for optimal results, but that’s not the object of this article.

The most common and straightforward way to inspect for corrosion under insulation is to cut plugs in the insulation that can be removed to allow for ultrasonic testing. The other commonly used methods are radiography, and complete insulation removal. More advanced methods include pulsed eddy current. CLICK HERE to read the seven most common methods of inspecting for CUI with their pros and cons.

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School For Thought

Oct02 InspirationalGraphicIf you're looking for a new direction in a rewarding new career, look no further than AINDT. AINDT offers the best, most affordable vocational school around. Non-destructive testing is a growing industry that is needed in just about every aspect of our daily lives from the auto industry, to bridges, to oil and gas development, to aerospace. AINDT offers the technical vocational training you need to get certified in a high-demand, well-paying career that will never become obsolete. Combining both interactive, trade school courses with hands-on training, AINDT also offers job placement assistance to find your perfect fit in your chosen field. Call 855-313-0325 today. Instructors are waiting to talk to you!
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What Is NDT?

b2ap3_thumbnail_Mar02_InspirationalGraphic.jpgNon-destructive testing (NDT) covers an endless array of components we use in our everyday lives. Structural integrity is crucial in all of our machines and structures, down to the smallest detail. NDT technicians are certified in testing all these components for safety and reliability. NDT typically takes place many times at regular intervals, utilizing methods that do not interfere with the materials. NDT tests for effects of wear, fatigue, corrosion, stress, or any other factors that may interfere with the safety and structural integrity of the material at hand. If this sounds like a crucial field to be involved in, that's because it is! Call AINDT today to get started training for an exciting new career that is in increasingly high demand.
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What is NDT and its Benefits

Source: Industrial Technical Services, What is NDT and its Benefitsb2ap3_thumbnail_industrial1-colored_20151102-143451_1.png
July 19, 2015

"What is NDT and its Benefits
Non-destructive testing is a descriptive term used for the examination of materials and components in such a way that allows materials to be examined without changing or destroying their usefulness. NDT or NDE can be used to find, size and locate surface and subsurface flaws and defects.

NDT plays a crucial role in everyday life and is necessary to assure safety and reliability. Typical examples are found in aircraft, motor vehicles, pipelines, bridges, trains, power stations, refineries, buildings and oil platforms which are all inspected using NDT."

Click Here to read about what NDT is typically used for.

The American Institute of Nondestructive Testing (AINDT) is licensed as a private career school with the Minnesota Office of Higher Education pursuant to Minnesota Statutes, sections 141.21 to 141.32.

Wonder why you should consider AINDT? Click Here and read about personalized hybrid teaching school for nondestructive testing.

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Further Your Career in Nondestructive Testing!

b2ap3_thumbnail_Dec02_YourCareer.jpgFurther YOUR Career! Already working in the NDT field? Awesome! You can further your career with AINDT by taking Individual Classes.

From Intro to NDT to Magnetic Particle Testing (MT) Level I and II and everything in between is offered at AINDT.

All individual classes include study material, access to our online learning system, and instructor support via phone, gototraining.com video conference, and/or email. See for yourself the variety of courses available at the American Institute of Nondestructive Testing. Call 855-313-0325 and talk to an instructor to see if individual NDT courses are right for you!

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