What is the difference between a UB and a PFC?

[jsstevenson]

Structural Engineering Question....

I am curious as to what the difference is between a Universal Beam (UB) and a Parallel Parallel Flange Channel (PFC).

I get the impression a UB is like an 'I' beam and and PFC is like half an I beam (that is, the letter 'u' lying on its side!!!)

Also what do the three measurements mean when these items are specified, for example....
200x90x30 PFC
254x102x28 UB

I assume this means height, depth, and guage... with length left unspecified initially if being used to bridge a stairway opening as an example?

Thanks for any information.

 

[Richard C]

Correct in your definition & youve got 2 out of the 3 figures right; the 3rd figure is actually the mass (wt in kg) per metre. A look here will explain in all the detail your likely to want:

http://www.google.co.uk/search?hl=en&q=I+beam+sizes&btnG=Search&meta=cr=countryUK|countryGB

 

[jsstevenson]

Excellent - your information answers my questions perfectly.
Thanks Richard C.