Derrick Service UK Ltd (DSL) is a diversified oil & gas construction company which provides a broad range of products and ser ... vices to the market from our Worldwide locations. We are holders of API 4F & 8C Licences for the design & manufacture, upgrade, inspection and repair of Drilling Structures. Some of our core business activities include brownfield installation upgrade and refurbishment projects, the design & manufacture of drilling structures, rig upgrade and refurbishment, as well as rope access and inspection services. We have fabrication/rig up facilities in the UK, UAE, Singapore and Indonesia with support operations in Houston and India. read more