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2. Texas City refinery explosion - Wikipedia

   en.wikipedia.org/wiki/Texas_City_Refinery_explosion

   The process control level transmitter was designed to indicate the raffinate level within a 5-foot (1.5 m) span from the bottom of the splitter tower to a 9-foot (2.7 m) level. A high-level alarm dependent on this transmitter sounded as intended at 3:09 am, when a level of 7.6 feet (2.3 m) from the bottom was reached.

3. Float switch - Wikipedia

   en.wikipedia.org/wiki/Float_switch

   A pedestal sump pump with a float switch. A float switch is a type of level sensor, a device used to detect the level of liquid within a tank. The switch may be used to control a pump, as an indicator, an alarm, or to control other devices. One type of float switch uses a mercury switch inside a hinged float.

4. Process plant shutdown systems - Wikipedia

   en.wikipedia.org/wiki/Process_plant_shutdown_systems

   A process plant shutdown system is a functional safety countermeasure crucial in any hazardous process plant such as oil and gas production plants and oil refineries. The concept also applies to non-process facilities such as nuclear plants. These systems are used to protect people, assets, and the environment when process conditions get out of ...

5. Pumping station - Wikipedia

   en.wikipedia.org/wiki/Pumping_station

   Features may include controls for fully automatic operation; a high-level alarm indication, in the event of pump failure; and possibly a guide-rail/auto-coupling/pedestal system, to permit easy removal of pumps for maintenance. Traditional site constructed systems have the valve vault components installed in a separate structure.

6. Alarm management - Wikipedia

   en.wikipedia.org/wiki/Alarm_management

   Step 4: Alarm documentation and rationalisation (D&R) A full overhaul of the alarm system to ensure that each alarm complies with the alarm philosophy and the principles of good alarm management. Step 5: Alarm system audit and enforcement. DCS alarm systems are notoriously easy to change and generally lack proper security.

7. Tanker (ship) - Wikipedia

   en.wikipedia.org/wiki/Tanker_(ship)

   For oil tankers, systems will need to be in place to manage operational hazards, including a means of producing and introducing inert gas into cargo tanks to prevent explosion. [5] Cargo tanks are typically fitted with the ability to monitor levels of liquid within a tank, as well as an overfill or high level alarm function. [5]