How heavy in kilograms is a traditional Hogshead of beer ( 54 gallons )

Hello -

Well, a gallon is = 3.9L so, there are 3.9*54 = 211 L in a hogshead.  

Beer has a density ranging from 1.004 to 1.060 kg/L:
http://hypertextbook.com/facts/2000/BlairElefant.shtml

which gives a range of 212 kg to 224 kg.

Note - a hogshead is also sometimes defined as being 63 liters:
http://www.ceramics.com/mass3.html
http://www.kancoll.org/articles/eberly.htm

for which the answer would be 246 kg to 260 kg.

Let me know if you have further questions.

synarchy

Google search:
hogshead 
hogshead kilogram
density beer

It should be noted that the 54 gallons in a hogshead of beer are
generally understood to be imperial gallons, not U.S. gallons.

://www.google.com/search?hl=en&ie=UTF-8&oe=UTF-8&q=hogshead+%2254+imperial+gallons

An imperial gallon contains 4.54591 liters 

A U.S Gallon contains    3.78531  litres

Taken from Chamber's Metrication Tables

To Synarchy-ga
I have looked at two of the links given and can find no reference to a
Hogshead of 63 Liters
 Kemlo

Go to http://www.weights-and-measures.com/

It is an exhaustive website on all weights and measures.