Surface corrosion protection

[jinlongman]

Dear All,

Can somebody tell me what coal oil leakage test is and what is its purpose?

Thank you.

 

[gr2vessels]

I believe that your boss is pulling your left leg, because the advice on the elbow grease didn't work, so he got a new one. He's trying to get you squeeze hard some coal until you give up job or you'll find oil in the coals. Try looking early for positions vacant, just in case...

 

[unclesyd]

As you didn't provide much information here is try.

Coal oil is variety of kerosene close to jet fuel. There was a lot integrity testing done with kerosene as the pressure media. When I worked for a valve and fittings company we used kerosene.

I don;t know if ASTM has a test utilizing kerosene.


Read the full text page.

http://www.springerlink.com/content/v2j7536005862462/

 

[unclesyd]

Forgot to add that coal oil was derived from condensed gases from coke ovens. If I recall correctly it was the bottoms of the Benzene column.

 

[jinlongman]

Hi gr2vessels, it’s not my Boss its design Eng. Department that asks for that. Currently I’m writing painting procedure for surface coating of Hydro power Equipment. I’m working in China for a big multinational company and this Chinese design engineer insist I put in the procedure kerosene leakage test of welds prior to painting cos it’s cheap and economical way to check soundness of weld before painting. Apparently one pours kerosene over welds and if not drip at the bottom welds is sound. I explained to him that in this modern age we use UT, MT, PT, RT and other means of checking soundness of weld and not this 1920’s method. There you are.

 

[unclesyd]

What your source is probably talking about is the old "kerosene/whiting test". This is the forrunner of the modern PT testing dye and developer.

In my early years I seen this test used to check auto engine heads. They would clean the heads and soak them in kerosene drain off the ecess then set them in the sun for a couple of hours then wipe of the excess, and dust the head with whiting in flour sack.

This the second phase of the kerosene Test where they used a suspension of whiting in alcohol to get a better coating.

http://books.google.com/books?id=ft...hl=en&sa=X&oi=book_result&resnum=10&ct=result

 

[gr2vessels]

jin,
Besides of the joke, you should know that the API 650 ed 2007 has included in the shell testing section a new clause (para 2. of clause 7.3.5) which reads as follows:
"If sufficient water to fill the tank is not available, the tank may be tested by (1) painting all of the joints on the inside with a highly penetrating oil, such as automobile spring oil, and carefully examining the outside of the joints for leakage;...". I hope that the coal oil is a testing medium and not additive to the export cooking oil.
Cheers,
gr2vessels

 

[jinlongman]

Gr,
What design engineer wanted is exactly what are you saying. “Painting all of the joints on the inside with highly penetrating oil, such as automobile spring oil, and carefully examining the outside of the joints for leakage”. Actually it was oil tank that he wanted to be tested for leakage. The problem was translating it from Chinese to English. The penetrant oil is by product of coal oil.

Thank you all for your time