What is the maximum hose pressure for 2 1/2 inch hoses?

What is the maximum hose pressure for 2 1/2 inch hoses?

• A. 450 psi
• B. 360 psi
• C. 540 psi
• D. 200 psi

Answer: (A)

The idea behind hose pressure ratings is that hoses have a safe operating (working) pressure and a separate test (proof) pressure used to verify integrity. For 2 1/2 inch attack hoses, the working pressure is typically about 300 psi. To ensure the hose can handle higher stresses without failure, it’s hydrostatically tested at a higher pressure—often 1.5 times the working pressure. That comes out to 450 psi (1.5 × 300 psi). So 450 psi is the pressure used to prove the hose can withstand higher loads during testing, while the hose is normally used at or below the 300 psi working pressure in service. The other values don’t fit that testing standard: 200 psi is below working pressure, 360 psi isn’t the standard test pressure for a 300 psi working rating, and 540 psi would be 1.8 times the working pressure, not the typical test value.

The idea behind hose pressure ratings is that hoses have a safe operating (working) pressure and a separate test (proof) pressure used to verify integrity. For 2 1/2 inch attack hoses, the working pressure is typically about 300 psi. To ensure the hose can handle higher stresses without failure, it’s hydrostatically tested at a higher pressure—often 1.5 times the working pressure. That comes out to 450 psi (1.5 × 300 psi). So 450 psi is the pressure used to prove the hose can withstand higher loads during testing, while the hose is normally used at or below the 300 psi working pressure in service. The other values don’t fit that testing standard: 200 psi is below working pressure, 360 psi isn’t the standard test pressure for a 300 psi working rating, and 540 psi would be 1.8 times the working pressure, not the typical test value.