1991 - Publication of the 'BLUE' IHC piling book

IHC's 'BLUE' book contains a detailed analysis of the background to pile driving theory and gives an indication of how IHC hammer properties should be entered in a number of "piling formulas". Piling graphs showing the relationship between the blowcount and the resistance during pile driving are also given for all the hammers in the S-series and the most common piles.