United Holdings also manufactures oilfield service equipment, including hydraulic fracturing equipment.
The base purchase price was $270m in cash, before post-closing adjustments.
Kirby financed the acquisition by using its existing cash and revolving credit facility.
US based Kirby is in the marine transportation business, principally operating inland tank barges and towing vessels, and transporting petrochemicals, black oil products, refined petroleum products and agricultural chemicals throughout the US inland waterway system.
