Which of the following is not a recommended step for the procedure in which dry nitrogen is used for a system leak test?
a) Remove controls and relief valves which may be damaged by the test pressure.
b) Connect the nitrogen cylinder to the system charging valve.
c) Close the liquid line shut-off valve.
d) Open the liquid line shut-off valve.
e) Set the pressure reducing valve for the minimum design pressure of the high side.
Answer: D