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Alfa Laval S-separators 805/815

S and P Flex separation systems

Alfa Laval’s S and P Flex separation systems combine the high efficiency, low sludge output and low operating cost of Alfa Laval centrifugal separators with a flexible scope of supply. Extensive possibilities for the separation system layout and assembly make it possible to suit any engine room and any oil separation application.

In addition, S and P Flex separation systems feature the EPC 60 controller, which enables the intuitive navigation of menus, parameters and alarms. The EPC 60 controller has a modular construction for easy I/O board addition and replacement.

The S and P Flex separation concept includes the complete S- and P-separator range. These can all
be combined in mixed ship sets, even within a single customer-specified module.

Application S-separators

S-separators are based on Alcap technology, which means they automatically adjust the oil/water interphase and also supervise the water content in the clean oil outlet. This makes them particularly suitable for separating heavy fuel oils with varying density, although they can be used to clean all of the following:

  • Heavy fuel oils with densities up to 1 010 kg/m3 and viscosities up to 700 cSt/50°C (higher viscosities available upon request)
  • Lubricating oils
  • Distillates
  • Lighter diesel oils

S-separators 805/815 optimized for lower flows onboard small ships combine ease of use, low operating cost and robust design ensuring high reliability. They are designed for automatic operation in periodically unmanned engine rooms at sea and in automated power stations ashore.

Scope of supply

The S and P Flex separation concept provides a wide range of alternatives for S-separators. Depending on the need, an S-separator can be supplied as a separator with ancillaries, as a customer-specified
module or as part of a comprehensive package including services and orderspecific documentation.

Flex system

An S-separator with ancillaries in the form of optimized block components provides full say over the use of space. This allows for local modularization or do-it-yourself assembly.

Flex modules

A compact S-separator module can be built to a customer-specified configuration from a wide range of modular skids and machine blocks. Multi-modules are possible, as well as mixed modules including one or more S-separators and/or P-separators for the simultaneous treatment of different types of mineral oils. All Flex modules are factory tested to ensure faster start-up and commissioning.

Features and benefits

  • Small footprint, high flexibility
    The small separator and the modular nature of the surrounding components allow easy installation and flexible positioning in the engine room.
  • Optimum performance with Alcap technology
    A water transducer in the clean oil outlet automatically adjusts the oil/ water interphase to maximize separation performance.
  • High separation efficiency
    An optimized design ensures the best possible separation efficiency from the bowl and disc stack.
  • Simple installation
    No tank is needed to supply operating water and no pipe is needed to discharge it, which further simplifies installation.
  • Separate feed pump
    A separate feed pump reduces pipework to and from the preheater.
  • Low oil loss
    The separator’s highly efficient displacement ensures that virtually no oil is lost.Features and benefits
  • Efficient discharge
    Separated sludge and water are efficiently removed from the system.
  • Easy operation and service
    The PLC based EPC 60 ­controller is designed for “one-button” starts and stops, as well as intuitive menu navigation. Information about parameters and alarms can be easily accessed, which simplifies both operation and troubleshooting. The EPC 60 also has a modular construction that enables faster troubleshooting and I/O board replacement.
  • Remote monitoring
    Using either Ethernet or Bus communication, Flex systems and modules based on S-separators
    805/815 can be supervised remotely from the control room. A variety of alarm functions is available as standard and extra I/O boards can be added to the EPC 60 controller in order to enhance its monitoring capabilities.

Operating principle

A Flex separation system based on S-separators 805/815 is operated automatically by the EPC 60 controller, except at startup. Untreated oil, heated to the correct temperature, is fed continuously to the separator, which is driven by an electric motor via a friction clutch and belt.

The separator bowl is fixed at the top of a spindle, which is supported by bearings and springs. During operation separated sludge and water accumulate at the bowl periphery and are intermittently discharged by the highprecision discharge system.

Operation of the separator is based on the Alcap principle, which means the separator automatically adjusts to the density of the oil. Thus, no gravity disc is needed. A water transducer in the clean oil outlet measures capacitive resistance and signals changes to the EPC 60 controller.

When the water content has increased or the timer setting has expired, the system automatically discharges the accumulated water and sludge through the bowl discharge ports during a controlled sludge discharge.

During normal operation, vital process parameters are monitored. These parameters, as well as alarms, are indicated by easy-to-understand text messages on the LCD display of the EPC 60 controller.

The EPC 60 controller provides many alarm functions, in-cluding alarms for low oil pressure, high sludge tank level (if the optional sludge removal kit is included) and power failure. Additional functions are available as well.