§ 54. Construction against fire. All public vessels shall be so
constructed that inflammable material about any machinery or apparatus
involving danger of fire where such inflammable material is exposed to
ignition, shall be shielded by some incombustible material so that the
air may circulate freely between such material and the ignitable
substances. Before granting a certificate of inspection, the inspector
shall require that all necessary provisions be made throughout such
vessel as he may judge expedient to guard against loss or damage by
fire.