When initiating a pumper-to-pumper relay, what pressure should the relay pumper start at?

When initiating a pumper-to-pumper relay, starting at 175 psi for the relay pumper is advisable because this pressure provides a good balance between ensuring adequate water flow and minimizing the risk of exceeding the pressure limits for hoses and fittings.

Setting the pressure at 175 psi allows the relay pumper to maintain a sufficient flow rate required to effectively supply water to the attack pumper while compensating for any friction loss in the hose lines. This pressure also considers typical operational scenarios where excessive pressure could lead to damage or unintended discharges from hose connections.

Ultimately, selecting 175 psi is a standard practice that offers reliability and efficiency in firefighting operations, ensuring that the required water supply reaches the fire scene effectively.