What is Fail Open, Fail Closed and Fail Lock in Control Valve Failure Mode
Resumen
TLDRThis video from Hard Hat Engineer explains the three failure modes of control valves: fail open, fail close, and fail lock. Control valves, which consist of a valve and an actuator, control pressure, flow, and temperature using external energy sources like air, electricity, or hydraulic fluid. The failure mode dictates the position of the valve if this energy is lost. - **Fail Open**: If power or control signal is lost, the valve moves to the fully open position. This is crucial for systems needing continuous flow, such as cooling systems. - **Fail Close**: In the event of power or signal failure, the valve moves to the fully closed position. This mode is essential for stopping flow in systems like fuel supply to heaters. - **Fail Lock**: The valve stays in its last position upon losing power or signal, often used when neither fully open nor closed positions are safe. This mode requires additional components like a positioner with lockup valves. The video emphasizes the importance of these modes in ensuring process safety and equipment protection, illustrating their applications through P&ID diagrams.
Para llevar
- 🔧 Control valves have two main components: valve and actuator.
- 🔌 Failure modes occur when external energy sources are cut off.
- 🚪 Fail Open mode ensures continuous flow during power loss.
- 🔒 Fail Close mode stops flow to prevent hazards during failure.
- ⛔ Fail Lock mode maintains the last known valve position during failure.
- 🔍 P&ID diagrams help in understanding valve positions during failures.
- 🔥 Fail Close is essential for fuel supply systems.
- ❄️ Fail Open is crucial for systems requiring continuous flow, like cooling.
- 🔐 Fail Lock requires additional components like lockup valves.
- 🧠 Understanding failure modes is key to ensuring safety and efficiency.
Cronología
- 00:00:00 - 00:05:10
In this video, viewers will gain an understanding of control valves' three failure modes: fail open, fail close, and fail lock, which are vital for process safety and efficiency. Control valves, comprising a valve and actuator, regulate pressure, flow, and temperature using external energy. If this energy is lost, the valve's failure mode determines its position to ensure safety and prevent damage. The video starts by explaining 'fail open', where the valve defaults to open if power or signals are lost, beneficial in cooling systems. It then covers 'fail close', where the valve closes in power/signal loss situations, crucial for stopping hazardous flow. Finally, it discusses 'fail lock', where the valve maintains its last position amid power/signal loss, useful when neither opening nor closing is ideal during failures. P&ID symbols depict these modes, ensuring clear communication in system designs.
Mapa mental
Vídeo de preguntas y respuestas
What are the main components of a control valve?
A control valve consists of the valve itself and the actuator.
What is the purpose of failure modes in control valves?
Failure modes maintain safety and prevent equipment damage when there's a loss of power or signal.
What happens in fail open mode?
The valve moves to a fully open position upon losing power or control signal.
When is fail close mode used?
Fail close mode is used in systems where stopping flow is critical, such as in fuel supplies to heaters.
What is fail lock mode?
In fail lock mode, the valve stays in its last position upon losing power or signal.
Are additional components required for fail lock mode?
Yes, fail lock mode typically requires components like a positioner with lock-up valves.
Why is understanding these modes important?
Understanding these modes is crucial for ensuring process safety and equipment efficiency.
Ver más resúmenes de vídeos
- control valves
- fail open
- fail close
- fail lock
- process safety
- valve actuators
- P&ID symbols
- equipment protection
- cooling systems
- manual intervention