The hydraulic control line, also known as a chemical injection line, is a small-diameter line, usually ⅛ in.  to  ⅝ in. , used to execute tool recovery, perform chemical injection, and operate downhole completions equipment such as surface-controlled subsurface safety valves (SCSSV). When used with an SCSSV, the hydraulic control line maintains constant pressure to keep the safety valve open. If a leak occurs, pressure in the control line drops, enabling the safety valve to snap closed and prevent low of well control.Strong, corrosion-resistant, and reliable, these lines meet all ASTM standards and operate effectively in difficult environments to maintain production flow. Lines are pressure-tested and certified before deployment. They are available for any length well.