What is the minimum and maximum percentage of operating pressure used to test pipe covered under B31.5?

In the context of testing pipe systems under the B31.5 code, which governs the design and construction of refrigerant piping systems, the specified parameters for pressure testing are crucial for ensuring the integrity and safety of the piping. The minimum pressure for testing is set at 110% of the operating pressure, which is vital to ensure that the system can handle pressures beyond its normal operational levels. This testing threshold ensures that any potential weaknesses or leaks in the system can be detected before the system is put into regular use.

Moreover, the maximum pressure of 130% is established to prevent excessive stress on the piping materials. Exceeding this maximum could risk damaging the pipes or fittings, leading to failures or safety hazards. The range defined by these percentages is part of a broader safety protocol designed to minimize the risk of pressure-related incidents.

The other options provide different ranges that either fall below the necessary minimum or above the maximum limits outlined in B31.5, which would not comply with the industry standards for safety and reliability during pressure testing.