Hydrostatic testing of a boiler requires raising the pressure to what level in relation to the Maximum Allowable Working Pressure?

Hydrostatic testing is a critical procedure used to assess the integrity of a boiler by ensuring it can withstand pressure without any leaks or structural failures. During this test, the pressure is raised to a specific level that is significantly above the normal operating conditions to ensure that any weaknesses or defects in the material can be detected.

The correct answer indicates that the hydrostatic test pressure should be raised to 1.5 times the Maximum Allowable Working Pressure (MAWP). This means if the normal working pressure of the boiler is, for example, 100 psi, the hydrostatic test would involve pressurizing it to 150 psi. The reason behind this safety margin is to account for unexpected stresses and wear that might occur during regular operation, and to ensure that the boiler's design is robust enough to handle unforeseen conditions.

Using a multiplier of 1.5 provides a significant safety buffer while also ensuring that the test is not excessively high, which could put undue stress on the boiler materials. This approach helps to confirm the reliability and structural strength of the boiler, ensuring it remains safe for operational use.