UCS-66 Energy Value

[ENG2194]

Do the 4 different curves correlate to 4 different energy values? If so, does anyone know what they are?

 

[SJones]

Review the first sentence of UCS-66 (a) and the axis labels. It is simply for exemption, not acceptance criteria. Charpy energy criteria are given elsewhere, e.g. UG-84.1.

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/in/drstevejones

All answers are personal opinions only and are in no way connected with any employer.

 

[ENG2194]

Thanks for the response SJones. I believe i found something a little closer to what i was looking for though.
From PED technical note 2006-03 rev.4 on PED impact testing exemption:"Refer to the curves in Fig. UCS-66 to estimate the impact properties. The curves establish the temperature at which an impact value of 15 ft.-lbs. (20 J) may be assumed."

So it may not be exact but it gives one a good idea of what they are looking at.

 

[SJones]

I don't know who "they" are, but does not a 20J assumption go against Guidelines F-19 and G-17?

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/in/drstevejones

All answers are personal opinions only and are in no way connected with any employer.

 

[ENG2194]

This is what i was given by Hartford steam boiler. Option 3 combines being on the UCS-66 curve at the desired temperature (20J) with chemical requirements in addition to other requirements. It must have been proven that reducing the carbon content among others of all the material specs for a given curve would increase the impact energy by at least 7J. HSB is our NOBO so if they approve thats good enough for me.