API RP 19G5 pdf download Operation, Maintenance, Surveillance, and Troubleshooting of Gas-lift Installations b) Gas injection control problems (see 6.2). -Operate close to the design conditions of the gas-lift installation. Redesign and re-install the gas-lift valves if the well conditions have changed enough to disturb effectiveoperation. -Use a properly ranged gas flow controller to provide consistent,stable flow.3.6Gas-lift Valve Problems Typical...