- (a) Firing of an automatic auxiliary boiler by natural gas is prohibited unless specifically approved by the Marine Safety Center.
- (b) Heated heavy fuel oil may be used provided the heaters are equipped with a high temperature limiting device that shuts off the heating source at a temperature below the flashpoint of the oil and is manually reset. When a thermostatically-controlled electric oil heater and a level device is used, it must meet the requirements of subpart 111.85 of this chapter.
- (c) The fuel oil service pump and its piping system must be designed in accordance with § 56.50-65 of this subchapter. All materials must meet the requirements of subpart 56.60 of this subchapter. The use of cast iron or malleable iron is prohibited.
- (d) The fuel oil service system (including the pump) must meet the pressure classification and design criteria found in table 1 to § 56.04-2 of this subchapter.
- (e) When properly selected for the intended service, fuel pumps meeting the performance and test requirements of UL 343 (incorporated by reference, see § 63.05-1) meet the requirements of this section.
Note 1 to paragraph (b): An auxiliary boiler may be safely ignited from the cold condition using unheated diesel or light fuel oil and subsequently shifted to heated heavy fuel.
[CGD 88-057, 55 FR 24238, June 15, 1990, as amended by USCG-2003-16630, 73 FR 65191, Oct. 31, 2008]