Each normally open valve shall be sealed or monitored in which way?

Each normally open valve shall be sealed or monitored in which way?

• A. Locked
• B. Padlocked
• C. Remote controlled
• D. Electrically supervised

Answer: (D)

Valves that are normally open must have a reliable way to verify their actual position at all times so that a change doesn’t go unnoticed and a potential release can be prevented. Electrically supervised means the valve’s position is continuously monitored by sensors connected to a supervising circuit. This setup not only confirms that the valve is truly open, but also detects faults, loss of power, or tampering, and immediately raises an alarm for quick action. Physical seals or locks can deter tampering but don’t provide ongoing status or automatic fault detection, and remote control isn’t the point here—the aim is to know the valve’s real state constantly and respond to any deviation.

Valves that are normally open must have a reliable way to verify their actual position at all times so that a change doesn’t go unnoticed and a potential release can be prevented. Electrically supervised means the valve’s position is continuously monitored by sensors connected to a supervising circuit. This setup not only confirms that the valve is truly open, but also detects faults, loss of power, or tampering, and immediately raises an alarm for quick action. Physical seals or locks can deter tampering but don’t provide ongoing status or automatic fault detection, and remote control isn’t the point here—the aim is to know the valve’s real state constantly and respond to any deviation.