Wellhead flowline protection system

An automated flowline protection system for protecting a flowline at an oil or gas wellhead, the flowline protection system comprising an emergency shutdown system, a high integrity protection system, and a local control panel;

• the emergency shutdown system comprising:
• an emergency shutdown valve installed downstream of the wellhead on a high pressure segment of the flowline;
• an emergency shutdown valve actuator;
• an emergency shutdown valve stem position switch that monitors the position of the emergency shutdown valve;
• a first pressure transmitter installed on the high pressure segment of the flowline between the wellhead and the emergency shutdown valve;
• a first pressure switch installed on the high pressure segment of the flowline downstream of the emergency shutdown valve and upstream of the high integrity protection system;
• and a first differential pressure indicator installed across the emergency shutdown valve;
• wherein the emergency shutdown valve actuator, the emergency shutdown valve position switch, the first pressure transmitter, the first pressure switch, and the first differential pressure indicator interface with the local control panel;
• and
• the high integrity protection system comprising:
• at least one set of a first and second inline valve installed in series on the high pressure segment of the flowline, downstream of the emergency shutdown system;
• a first inline valve actuator;
• a second inline valve acuator;
• a first and second inline valve stem position switch respectively monitoring the positions of the first and the second inline valves;
• a second pressure transmitter and a second and a third pressure switch installed downstream of the high integrity protection system and upstream of a spec break separating the high pressure segment of the flowline from a downstream lower pressure segment of the flowline;
• a second and a third differential pressure transmitter installed respectively across the first and the second inline valves;
• and a fourth differential pressure transmitter installed across the series installation of the first and the second inline valves;
• wherein the first and the second inline valve actuators, the first and the second inline valve position switches, the second pressure transmitter, the second and the third pressure switches, and the second, the third, and the fourth differential pressure indicators interface with the local control panel.