What is the typical pressure range for the nozzle used in service testing?

The typical pressure range for nozzles used in service testing is commonly set between 60 to 70 psi. This range is generally accepted because it allows for a balance between effective fire suppression performance and manageable operational control for the firefighter.

When nozzles operate within this pressure range, they can deliver an adequate flow rate and stream quality, which are critical for extinguishing fires effectively. Adequate pressure helps maintain the nozzle's intended spray pattern, ensuring that water can reach the target. This optimal pressure also minimizes the risk of nozzle fatigue and potential failure during operation.

While other options present different pressure ranges, they may either provide insufficient stream quality or produce excessive pressure that complicates usage or could risk injury to firefighters handling the equipment. This makes 60 to 70 psi the most suitable choice for ensuring effectiveness and safety in service testing scenarios.