Herrenknecht AG,based Germany,was established in 1977 and is a leading manufacturer of tunnelling equipment.Through innovation and development,Herrenknecht has expanded its equipment range with specialised pipeline installation technologies.Herrenknecht's horizontal directional drilling(HDD)rigs offer pull forces from 80 to 600 t,a range of HDD tooling including full face hole openers(FFHO)for single-pass large diameter reaming stages,weeper subs and downhole jet pumps.It offers Direct Pipe~R technology,using AVN machine and Pipe Thruster,for single-pass installation of steel pipelines from 20 to 60 inches(508 to 1,524 mm)in difficult ground conditions,sensitive areas,or shore approaches.
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