Will a silvered mirror have a high or low emissivity?

May 15, 2016By Bob BerryGeneral

This is an excellent question. A silvered mirror is a piece of glass, coated on one side with a very reflective metal. The silvered side with have an extremely low emissivity, but the other side is essentially glass, so its emissivity will be the emissivity for the glass, which should be high. Sometimes people use … Read More

What is temperature?

May 13, 2016By Bob BerryGeneral

  An excellent question, the concept of temperature relates to the average speed of molecular movement. It is a relative measurement, letting us know simply that one object is hotter (or colder) than another object. The principle of temperature measurement is essentially linked to the so-called “Zeroth Law of Thermodynamics”. This curiously named law is … Read More

CUI Classification with thermography

May 11, 2016By Bob BerryGeneral

What priority classification should be used for CUI (corrosion under insulation) thermography inspections? CUI is more difficult to classify than electrical thermography. There are many criteria that affect the likelihood of corrosion, including condition of insulation, operating temperature, and surface protection. To classify the risk based on temperature is normally done as follows*; High between … Read More

Can I skip Level 1 thermography & move directly to Level 2?

May 9, 2016By Bob BerryGeneral

I have been asked this again. In short the answer is maybe, it depends, but it is not recommended. ISO 18436 does make allowances for previous learning and permits people to move directly to Level 2 in certain circumstances. Every case is really assessed individually. It is likely that if you recently completed a degree … Read More

Certification issues

May 8, 2016By Bob BerryGeneral

I am often asked by student to explain the difference between ASNT and ISO certification systems. Proper certification is pure written proof of qualification. So while I agree very much that you can be competent without certification, this is not to say that certification has no value. There are various types of certification; 1 Training company … Read More