Furnishes surface control (manual and automatic)
Provide containment of well fluids and provides downhole access for well servicing.
Both answers are correct
Maximum Allowable Working Pressure
Minimum Allowable Working Pressure
None of these
Never be used to shut the well in while the well is flowing unless it is an emergency.
Always be left half open
Never be opened
It doesn't matter which valve is closed first
The Wing Valve
The Master Valve
Access to the different casing strings to monitor the pressure
Allow wireline access to the SCSSV
Shut in the wellhead in case of an emergency.
When the well is used for gas lift
When the casing pressure is 0 psi.
When the casing pressure is 100 psi.