Boiler and steam propulsion fundamentals

46 CFR §56.01-3

§ 56.01-3 -3 Power boilers, external piping, and appurtenances (Replaces 100.1.1, 100.1.2, 122.1, 132 and 133). (a) Power boiler external piping and components must meet the requirements of this part and §§ 52.01-105, 52.01-110, 52.01-115, and 52.01-120 of this subchapter. (b) Specific requirements for external piping and appurtenances of power boilers, as defined in Secs. 100.1.1 and 100.1.2, appearing in the various paragraphs of ASME B31.1 (incorporated by reference; see § 56.01-2), are not adopted unless specifically indicated elsewhere in this part. [CGD 77-140, 54 FR 40602, Oct. 2, 1989; 55 FR 39968, Oct. 1, 1990; USCG-2003-16630, 73 FR 65174, Oct. 31, 2008]

46 CFR §56.50-30

§ 56.50-30 -30 Boiler feed piping. (a)(1) Steam vessels, and motor vessels fitted with steam driven electrical generators must have at least two separate means of supplying feed water for the boilers. All feed pumps must be fitted with the necessary connections for this purpose. The arrangement of feed pumps must be in accordance with paragraph (d) or (e) of this section. (2) Feed pump supply to power boilers may utilize the group feed system or the unit feed system. (3) Feed discharge piping from the pump up to, but not including the required stop and stop-check valves, must be designed for either the feed pump relief valve setting or the shutoff head of the pump if a relief valve is not fitted. (Refer to § 56.07-10(b) for specific requirements.) Feed piping from the boiler, to and inc…

46 CFR §63.01-3

§ 63.01-3 -3 Scope and applicability. (a) This part contains the requirements for automatic auxiliary boilers, including their controls, control system components, electrical devices, safety devices, and accessories. Types of automatic auxiliary boilers which are covered include large and small automatic auxiliary boilers, automatic heating boilers, automatic waste heat boilers, donkey boilers, miniature boilers, electric boilers, fired thermal fluid heaters, automatic incinerators, and electric hot water supply boilers. Automatic auxiliary boilers are classified by their service, control systems, pressure and temperature boundaries, heat input ratings, and firing mediums as follows: (1) Automatic auxiliary boilers listed in table 1 to § 54.01-5 of this subchapter which reference this pa…

46 CFR §63.20-1

§ 63.20-1 -1 Specific control system requirements. In addition to the requirements found in ASME CSD-1 (incorporated by reference; see § 63.05-1), the following requirements apply for specific control systems: (a)Following emergency safety trip control operation, the air flow to the boiler must not automatically increase. For this condition, postpurge must be accomplished manually. (b)A low fire interlock must ensure low fire start when variable firing rates are used. (c)Water level controls must be constructed and located to minimize the effects of vessel roll and pitch. Float chamber low water cutoff controls using stuffing boxes to transmit the motion of the float from the chamber to the external switches are prohibited. No outlet connection other than pressure controls, water colum…

DOE-HDBK-1012 §1-2

DOE-HDBK-1012 §1-2 — Properties of fluids, phase change, and steam tables A pure substance can exist as solid, liquid, or vapor, and can change phase by adding or removing heat. Sensible heat changes a substance's temperature without changing its phase; latent heat changes its phase at constant temperature. When water at atmospheric pressure reaches 212 F it begins to boil, and further heat added (the latent heat of vaporization, about 970 Btu per pound) converts it to steam at the same temperature until all the liquid is gone. The temperature at which a liquid boils rises with pressure, which is why a boiler makes steam far hotter than 212 F and why lowering pressure in a condenser lets steam condense at a low temperature. Saturation is the condition where liquid and vapor coexist at the…

NAVEDTRA 14104 §3-1

NAVEDTRA 14104 §3-1 — The basic steam cycle A steam propulsion plant works on a closed cycle in which the same water is used over and over, changing between water and steam to carry energy from the boiler to the machinery and back. The cycle has four essential stages that mirror the Rankine cycle. First, the boiler adds heat: fuel burns in the furnace and the heat boils feedwater into high-pressure steam, which is usually superheated (heated above its boiling temperature) so it stays dry through the machinery. Second, that high-energy steam is piped to the main engine (a turbine or reciprocating engine), where it expands, gives up its energy as it drops in pressure and temperature, and turns the shaft to drive the ship and the generators. Third, the low-pressure exhaust steam passes to th…