When both intermittent blowoff valves on a boiler are seatless, what is the correct operating sequence?

When dealing with seatless intermittent blowoff valves on a boiler, it's crucial to manage the sequence of operations to ensure safe and efficient blowdown. The correct operating sequence involves opening the valve furthest from the boiler first. This practice helps to minimize thermal shock to the valve and the piping, as it allows steam and water to flow more uniformly and reduces the risk of sudden changes in pressure within the system.

By opening the valve that is furthest away first, any accumulated sludge or debris can be more effectively removed before tackling the valve that is closer to the boiler. Closing this furthest valve last also ensures that you maintain a consistent flow out of the system, preventing pressure surges or backflow issues that can occur if the close sequence is not followed correctly.

This operational sequence is particularly important for ensuring the longevity of the equipment and maintaining the integrity of the boiler system. Properly following this procedure minimizes risks associated with blowoff operations and promotes efficient blowdown practices overall.