46 CFR § 109.555
Propulsion boilers
April 15, 2021
The master or person in charge and the engineer in charge shall ensure that—
(a) Steam pressure does not exceed that allowed by the certificate of inspection; and
(b) The safety valves, once set, are not tampered with or made inoperative.
[CGD 73-251, 43 FR 56828, Dec. 4, 1978, as amended by CGD 95-028, 62 FR 51208, Sept. 30, 1997]