Emergency Isolation

To stop the release of a flammable or toxic material, an EBV is installed in the line upstream, downstream, or on both sides of a piece of equipment. This EBV is normally set in the open position and closes during an emergency. Consider installing emergency isolation block valves in areas, such as:

• Suction line of a pump that handles fire hazardous material but does not have a manual isolation valve that can be operated safely in a fire
• Remote location, isolated from unmanned pumping or compressor stations
• Fuel gas line(s) to a furnace, boiler, or fired heater
• Line(s) to and from a tank or pressure vessel (i.e., LPG sphere) that contains flammable or toxic material (stops the flow if there is a fire, release, or line rupture)
• Shore side of a wharf loading/unloading line (stops the flow if the line ruptures)

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