When operating seatless intermittent blowoff valves on a boiler, which valve should be opened first?

When operating seatless intermittent blowoff valves on a boiler, the valve that should be opened first is the one furthest from the boiler. This practice is crucial as it helps to ensure that the system is properly de-pressurized without causing a sudden surge or disturbance in the water flow. By opening the valve that is farthest away, it allows for the gradual release of pressure and exhaust of water from the system, which ensures that the system can adjust safely and reduces the risk of a pressure shock to the boiler and piping.

Additionally, opening the furthest valve first allows any trapped air or steam to escape from the system more efficiently. This method of operation promotes safety and optimizes the blow-off process, as it prevents any dangerous build-up of pressure in the boiler itself. Following this sequence enhances the overall safety protocols that are essential when working with steam systems and boilers.

In contrast, opening any valve closer to the boiler first may disrupt the balance of pressure and flow within the system, potentially leading to hazardous conditions. Therefore, starting with the valve furthest from the boiler is a critical and safe operational practice.