When engaging in a pumper to pumper relay, at what pressure should the relay pumper start pumping?

In a pumper to pumper relay, the relay pumper should start pumping at a pressure of 175 psi to ensure an effective and efficient transfer of water. This pressure is typically chosen because it balances the need to overcome friction losses in the hose lines while also providing sufficient pressure to deliver water to the fire scene.

Starting at 175 psi allows for adequate water flow to reach the desired locations while minimizing the risk of exceeding the capacity of the hose or causing other difficulties like kinking or burst hoses. It's a standard pressure that many fire departments have adopted, as it supports the effective management of relay operations under various conditions.

Other pressure levels may not provide the same efficiency or could lead to complications. For instance, a lower pressure might not be sufficient to handle the necessary water flow, while higher pressures could lead to issues with equipment or hoses. Thus, using 175 psi is considered optimal in most scenarios, respecting the operational guidelines established by fire service protocols.