Pipe ramming is a straightforward process. The product or casing pipe, fitted with a cutting shoe and lubricant pipes, is positioned on rails located on a stable platform, which allows the casing to be pushed into soil embankment on the designed alignment. A pneumatic hammer powered by compressed air is attached to the casing using a cone or collet/collar system. The ram hammers the open ended casing pipe through the soil to the exit area. Additional pipe lengths may be welded onto the casing periodically to lengthen the drive. Some soil may be removed during installation to reduce frictional drag of the casing but enough soil is kept in the casing until the completion of the drive to maintain a plug at the face of the casing. The soil contained in the casing when the drive is completed is removed typically by water or by air-pressure, or in the case of larger casings by auger.