English to German Tech/Engineering Petroleum Eng/Sci Salzkavernen, Technologie, Ventile

.Subsurface completion equipment is the headline to this section:
...volumes and pressures involved ensuring that natural gas does not escape from the caverns is paramount. For this reason, the Wellhead includes “shut-off” valves that can seal off the Production String from the Above-Ground Facilities. The Production String is also protected by several pieces of subsurface safety equipment. This includes a sub-surface safety valve (“SSSV”), which is installed approximately 50 meters below ground level and automatically seals off the Production String if the Wellhead shut-off valves or the Wellhead itself are damaged. It also includes two “Packers,” which hold the Production String in place and prevent it from falling into the cavern if the equipment ruptures. The uppermost Packer also seals off a liquid-filled annulus that serves ...