Offshore Energy Services, Inc. (OES) has been using the Delmag brand diesel hammer since 1976 across the U.S. Gulf Coast, both on land and offshore.
These hammers have proven to be very rugged and reliable. Delmag produced its first Diesel Pile Hammer with Impact Atomization in 1939. Since then, other hammers have come along, but none have proven to be as reliable as the German-built Delmag hammer. OES has in stock sizes from the D-15 which produces 27,100 ft-lbs to the D-80 which produces 225,000 ft-lbs. These hammers have been used to drive pipe piles from 14” to 96” in diameter.
Delmag diesel pile hammers are single-acting, free-fall hammers utilizing the principle of impact atomization.
The diesel pile hammer consists of upper and lower cylinders in which the piston is led. The hammer is equipped with a rope-controlled, adjustable fuel pump with four settings. This serves to regulate the stroke of the piston and therefore, the impact energy. This is a particular advantage when soil formations change. Optionally, a hydraulically actuated fuel pump with infinite settings is available. The maximum stroke of a piston is up to twelve feet, depending on soil conditions.
The diesel pile hammer utilizes a tripping device to lift the piston and start the hammer. Usually, the tripping device is lifted with a wire rope. In any case, where no wire rope is present, a hydraulic, hammer-mounted tripping device is available.
Since diesel pile hammers do not have any piston rods, crankshafts, cams or bearings, the hammers have little wear and are very reliable. They are near maintenance-free and can be used on different pile types like batter piles, H-beams, sheet piles, etc.