§ 56.50-60 Systems containing oil. ( a ) ( 1 ) Oil-piping systems for cargo or fuel oil must be separate from other piping systems as far as practicable, and positive means must be provided to prevent interconnection in service.
( 2 ) Fuel oil and cargo oil systems may be combined if the cargo oil systems contain only Grade E oils.
( 3 ) Oil pumps must have no discharge connections to fire mains, boiler feed systems, or condensers.
( b ) When oil needs to be heated to lower its viscosity, heating coils must be properly installed in each tank. ( 1 ) Each drain from a heating coil as well as each drain from an oil heater must run to an inspection tank or other suitable oil detector.
( 2 ) No part of the fuel-oil system containing heated oil under pressure exceeding 180 kPa (26 psi) may be placed in a concealed position so that defects and leakage cannot be readily observed. Each machinery space containing a part of the system must be adequately illuminated.
( c ) Filling pipes may be led directly from the deck into the tanks or to a manifold in an accessible location permanently marked to indicate the tanks to which they are connected. A shutoff valve must be fitted at each filling end. Oil piping must not be led through accommodation spaces, except that fill piping not normally used at sea may pass through accommodation spaces if it is of steel construction, all welded, and not concealed.
( d ) Piping subject to internal head pressure from oil in the tank must be fitted with positive shutoff valves located at the tank. ( 1 ) Valves installed on the outside of the oil tanks must be made of steel, ductile cast iron ASTM F1155 (incorporated by reference; see § 56.01-2), or a ductile nonferrous alloy having a melting point above 1,700 °F and must be arranged with a means of manual control locally at the valve and remotely from a readily accessible and safe location outside of the compartment in which the valves are located. ( i ) In the special case of a deep tank in any shaft tunnel, piping tunnel, or similar space, one or more valves must be fitted on the tank. In the event of fire, the flow of oil from the tank may be stopped by means of an additional valve on the piping outside the tunnel or similar space. Any such additional valve installed inside a machinery space must be capable of being operated from outside this space.
( ii ) [Reserved]
( 2 ) If valves are installed on the inside of the tank, they may be made of cast iron and arranged for remote control only. Additional valves for local control must be located in the space where the system exits from the tank or adjacent tanks. Valves for local control outside the tanks must meet paragraph (d)(1) of this section.
( 3 ) Power operated valves installed to comply with the requirements of this section must meet the following requirements: ( i ) Valve actuators must be capable of closing the valves under all conditions, except during physical interruption of the power system (for example, from cable breakage or tube rupture). Fluid power actuated valves, other than those opened against spring pressure, must be provided with an energy storage system which is protected, as far as practicable, from fire and mechanical damage. The energy storage system must be used for no other purpose and must have sufficient capacity to cycle all connected valves from the initial valve position to the opposite position and return. The cross connection of this system to an alternate power supply will be given special consideration by the Marine Safety Center.
( ii ) The valve must have a local power actuator to both open and close the valve, unless local manual opening operation will not prevent remote closing of the valve.
( iii ) The positioning of the valve by either the local or remote power actuators must not void the ability of the other actuator to close the valve.
( iv ) The valve must be provided with a means of emergency manual operation to both open and close the valve regardless of the status of the power operating system. Such manual operation may interfere with the power operation, and if so, must be protected by means of covers, locking devices, or other suitable means. Instructions and warnings regarding the emergency system must be conspicuously posted at the valve.
( 4 ) Remote operation for shutoff valves on small independent oil tanks will be specially considered in each case where the size of tanks and their location may warrant the omission of remote operation.
( e ) Fuel oil tanks overhanging boilers are prohibited.
( f ) Valves for drawing fuel or draining water from fuel are not permitted in fuel oil systems except that a single valve may be permitted in the case of diesel driven machinery if suitably located within the machinery space away from any potential source of ignition. Such a valve must be fitted with a cap or a plug to prevent leakage.
( g ) Test cocks must not be fitted to fuel oil or cargo oil tanks.
( h ) Oil piping must not run through feed or potable water tanks. Feed or potable water piping must not pass through oil tanks.
( i ) Where flooding equalizing cross-connections between fuel or cargo tanks are required for stability considerations, the arrangement must be approved by the Marine Safety Center.
( j ) Piping conveying oil must be run away from hot surfaces wherever possible. Where such leads are unavoidable, only welded joints are to be used, or alternatively, suitable shields are to be fitted in the way of flanged or mechanical pipe joints when welded joints are not practicable. Piping that conveys fuel oil or lubricating oil to equipment and is in the proximity of equipment or lines having an open flame or having parts operating above 500 °F must be of seamless steel. (See § 56.50-65.)
( k ) Oil piping drains, strainers, and other equipment subject to normal oil leakage must be fitted with drip pans or other means to prevent oil draining into the bilge.
( l ) Where oil piping passes through a non-oil tank without stop valves complying with paragraph (d) of this section installed at all tank penetrations, the piping must comply with § 56.50-50(k).
( m ) Each arrangement for the storage, distribution, and use of oil in a pressure-lubrication system must— ( 1 ) Comply with § 56.50-80; and
( 2 ) In a machinery space, meet the applicable requirements of paragraphs (b)(2) and (d) of this section and §§ 56.50-85(a)(11), 56.50-90(c) and (d), and 58.01-55(f) of this subchapter. No arrangement need comply with § 56.50-90 (c)(1) and (3) if the sounding pipe is fitted with an effective means of closure, such as a threaded cap or plug or other means acceptable to the Officer in Charge, Marine Inspection.
( n ) Each arrangement for the storage, distribution, and use of any flammable oil employed in a fluid power, control, or heating system must— ( 1 ) Comply with subpart 58.30 of this subchapter; and
( 2 ) Where means of ignition are present, meet the applicable requirements of §§ 56.50-85(a)(11), 56.50-90 (c) and (d), and 58.01-55(f) of this subchapter. Each pipe and its valves and fittings must be of steel or other approved material, except that the use of flexible piping or hose is permitted in accordance with §§ 56.35-10, 56.35-15, and 56.60-25(c).
[CGFR 68-82, 33 FR 18843, Dec. 18, 1968, as amended by CGFR 69-127, 35 FR 9979, June 17, 1970; CGD 73-254, 40 FR 40165, Sept. 2, 1975; CGD 77-140, 54 FR 40609, Oct. 2, 1989; 55 FR 39968, Oct. 1, 1990; CGD 83-043, 60 FR 24774, May 10, 1995; USCG-2000-7790, 65 FR 58460, Sept. 29, 2000; USCG-2004-18884, 69 FR 58346, Sept. 30, 2004; USCG-2003-16630, 73 FR 65178, Oct. 31, 2008]