Final answer:
The pressure at which attack hose is tested during annual testing can vary depending on local regulations, but a common pressure is around 300 psi or 20.7 bar. Testing at this pressure ensures the hose can withstand the forces in firefighting operations.
Step-by-step explanation:
The pressure at which attack hose is tested during annual testing can vary depending on the specific standards and regulations set by local fire departments or organizations. However, a common pressure used for testing attack hose is typically around 300 psi (pounds per square inch) or 20.7 bar.
By testing the hose at this pressure, it ensures that it can withstand the forces exerted on it during actual firefighting operations. It is important for hoses to be able to maintain their integrity and not burst or leak when subjected to high-pressure situations.
It is crucial to follow the guidelines and recommendations of the relevant fire safety authorities to ensure the safety and effectiveness of attack hoses.