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The minimum hydrostatic test pressure for a standard boiler is established at 1.5 times the Maximum Allowable Working Pressure (MAWP). This test is an essential safety measure that ensures the structural integrity of the boiler and its ability to withstand operational pressures safely.

By testing at 1.5 times the MAWP, the hydrostatic test provides a significant safety margin, allowing for the detection of any potential leaks or weaknesses in the boiler's design or material before it is put into service. This requirement is aligned with ASME Boiler and Pressure Vessel Code standards, emphasizing the importance of ensuring that the equipment can handle more than its maximum designed pressure during normal operation.

Testing at a pressure higher than the MAWP significantly reduces the risk of failure or accidents during the boiler's operational life, as it assesses the boiler structure's reliability under stress. This standard helps maintain a high safety level in boiler operation, protecting both the equipment and personnel.