What is Port-guided Globe Valve ?
Another variation on the globe valve design is the port-guided globe valve, where the plug has an unusual shape, projecting into the seat. Thus, the seat ring acts as a…
Fire and Gas system Audible and Visual Alarms
A fire alarm system has a number of devices working together to detect and warn people through visual and audio appliances when smoke, fire, carbon monoxide or other emergencies are…
What is Keyphasor ? How does Keyphasor works ?
A transducer that produces a voltage pulse for each turn of the shaft, called the Keyphasor. This keyphasor signal is used primarily to measure rotating shaft speed and serves as…
Proximity Transducer System Operation
Proximity Transducer System provides an output voltage directly proportional to the distance between the probe tip and the observed conductive surface. It is capable of both static (position) and dynamic (vibration) measurements, and…
Objective Questions on Valves
List of Objective Questions on Valves, Valves Test Questions and Online Quiz on Control Valves. Test Your skills on Control Valves. Objective Questions on Valves Valves Objective Questions 1. Valves are defined…
What is Process Override Switch (POS)?
Process Override Switch shall be provided to override unhealthy field inputs in order to facilitate start-up, which shall automatically be released upon normalisation of the field input or preset time,…
What is Maintenance Override Switch (MOS) ?
Maintenance Override Switch (MOS) shall be provided to override all field inputs designated to trip the facility in order to facilitate maintenance of field devices without interrupting the plant operation.…
Foundation Fieldbus Split Range Valves
In FOUNDATION Fieldbus systems (Note1), where a special software function block called “SPLT” exists to provide split-ranged sequencing to two valves. The “SPLT” function block takes in a single control…
Emergency Shutdown System Philosophy
The Emergency Shutdown System (ESD) is designed to protect the personnel, plant, equipment and the environment against pollution. The purpose of the ESD system is to monitor process safety parameters…
How to Read Circular Chart Recorder for Flow Measurement?
Flow Transmitter output in square-root value and chart recorder prints flow value in range 0 to 100%. How to read circular chart recorder?
