Self-Contained, Fully Mechanical, 1 out of 2 Flowline Protection System

摘要

A flowline protection system includes a first and second isolation valve connectable to a fully rated pipeline to prevent the flow of fluid through the fully rated pipeline when either of the isolation valves are in a closed position, interrupting the flow of fluids to a downstream underrated piping system to reduce the risk of overpressure or quantity of hydrocarbon released into the environment in the event of a line break. First and second hydraulic control assemblies each include high and low pressure safety pilot valves. Both the isolation valves return to the closed position if either high pressure safety pilot valve senses an operating pressure greater than a high pressure setting or if either low pressure safety pilot valve senses the operating pressure is less than a low pressure setting. The system is self-contained and free of a connection to any component other than the fully rated pipeline.

主权项

1. A flowline protection system for a fully rated pipeline, the fully rated pipeline having a fluid flowing through the fully rated pipeline at an operation pressure, the system comprising:
a first isolation valve and a second isolation valve, the first and second isolation valves being connected in series and connectable to the fully rated pipeline to prevent a flow of the fluid through the fully rated pipeline when either the first isolation valve or the second isolation valve is in a closed position; a first and second hydraulic control assembly, each of the hydraulic control assemblies including a high pressure safety pilot valve with a high pressure setting, and a low pressure safety pilot valve with a low pressure setting; wherein the first and second hydraulic control assemblies are configured to cause both the first isolation valve and the second isolation valve to return to the closed position if either of the high pressure safety pilot valves sense that the operating pressure is greater than the high pressure setting or if either of the low pressure safety pilot valves sense that the operating pressure is less than the low pressure setting; and wherein the isolation valves and the hydraulic control assemblies are part of a self-contained skid assembly free of a connection to any component other than the fully rated pipeline.