To complete purging, what is the total number of purgings required after increasing pressure by 15 psi?

To determine the total number of purgings required after increasing pressure by 15 psi, it's important to understand the context of how purging is defined in the specific operational or technical framework you're studying. Generally, purging procedures are implemented to ensure that a system is safe, following pressure changes, especially when dealing with gases or fluids that might be released into the environment.

In many industrial or procedural practices, a certain number of purges are often mandated for each incremental pressure increase to ensure that all residual materials are cleared from the system and that full operational safety is achieved. The increasing pressure can cause residual contaminants or even potential hazards to be displaced or not entirely removed unless an adequate number of purgings are performed.

In this case, if the procedure dictates that for every 5 psi of pressure increase, a specific number of purges must be performed, it would follow logically that, with a 15 psi increase, a corresponding increase in the number of purges is necessary. Therefore, the calculation would conform to the operational requirement of performing multiple purging cycles to safely accommodate a total increase of 15 psi.

Thus, if the procedure prescribes 5 purges for that range of pressure increase, achieving the required total of 15 psi would lead to