The management and treatment of marine fuels onboard ships is a well-established practice. Many ships are equipped with treatment systems that marginally cope with fuels that meet specifications. In order to ensure adequate fuel treatment capacities, Alfa Laval has developed a full-scale laboratory method that meets the test requirements in terms of repeatatibility and reproducibilty.This method is accepted by the major marine classification societies. This paper dicusses the operating factors and key parameters that play important roles in fuel separation performance, such as temperature, capacity, installation, stable conditions, fuel characteristics, maintenance. Det Norske Veritas and other major marine classification societies have begun to develop routines for type approval for fuel oil sperators (purifiers) and has issued in January 2003 Rules for an additional class notation, Fuel which provides guidelines for fuel treatment systems. Details of this are presented. Some contents of the notation include: type-approved sperators, duplication of service and settling tanks, minimum service tank capacity for 12 and 24 h, smooth sloping bottoms for the tanks, arrangement of fuel bunkers, capacity and redundancy requirements for fuel oil heaters, system requirement for fuel conditioning systems (cleanliness, circulating flow rate, pressure, viscosity). A flow diagram for a fuel conditioning system is illustrated and discussed. Further design characteristics of such systems are presented (low presure or supply stage, high pressure or circulation stage and system configurations, especially a proposal from Alfa Laval). This system consists of two fuel conditioning modules, one for the main engine and one for the auxiliary engines. The advantages of this arrangement are shown. The modules include dedicated control systems and specically designed block components that provide ease of installtion, operation and service. The fuel treatment modules contribute to the economical building and operation of ships.
Type-approved fuel treatment systems ensure fuel quality at engine inlet
Kraftstoffaufbereitungssysteme mit Typenzulassung sichern die Qualität des Kraftstoffs bei Eintritt in den Motor
2003
11 Seiten, 4 Bilder, 2 Quellen
Conference paper
English