A periodic hydrostatic test is being performed on an oil-fired auxiliary water-tube boiler with a maximum allowable working pressure of 150 psig. In accordance with 46 CFR 61, what is the required hydrostatic test pressure for this procedure?

Correct Answer: Option B — 187.5 psig

Per 46 CFR 61.10-15, the hydrostatic test pressure for an existing boiler is 1.25 times the maximum allowable working pressure (MAWP). For a 150 psig boiler, the calculation is 150 multiplied by 1.25, resulting in a required test pressure of 187.5 psig to verify pressure boundary integrity.