... casing adopt mandrel hanger Single cylinder three pipe wellhead Working pressure:2000PSI ~ 20000PSIWorking medium: oil, natural gas, slurry containing H2S ... the liquid ( gas ) safety valveWorking pressure: 2000PSI ~ 20000PSI,Working medium: oil, natural gas, slurry containing H2S, CO2 gasWorking temperature: ... 4The level of performance: PR1 ~ 2 Single Cylinder Three Pipe Wellhead(API 6A Series)