Which precaution should be taken before starting a pump with a mechanical seal?

Before starting a pump with a mechanical seal, it is essential to ensure that the seal housing is vented. Venting the seal housing is important because it allows any trapped air to escape, which can prevent the formation of vacuum pockets that might interfere with the operation of the seal. If air is trapped in the seal housing when you start the pump, it can lead to improper sealing, causing leaks or even seal failure.

Mechanical seals rely on proper lubrication and pressure to function correctly, and trapping air would impede their performance. Furthermore, venting helps to protect the mechanical seal during startup by allowing the liquid to fill the space evenly, promoting a smooth and safe operation. This precaution is vital for the longevity and effectiveness of the mechanical seal, ensuring that the pump can operate efficiently without the risk of damage.