P Separators 805/815

A P-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.

Application P-separators

P-separators are based on purifier technology, which means that the oil/water interphase is manually adjusted by means of a gravity disc. Because the separators do not automatically adjust to varying oil density, they are most suitable for economical cleaning of the following:

  • Lubricating oils
  • Distillates
  • Lighter diesel oils

If the oil is well defined and does not vary in density, P-separators can also be manually adjusted to clean heavy fuel oils with densities up to 991 kg/m3 and viscosities up to 600 cSt/50°C.

P-separators 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 P-separators. Depending on the need, a P-separator can be supplied as a separator and ancillaries, as a customer-specified module, or as part of a comprehensive package including services and order-specific documentation.

Flex system

A P-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 P-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.

Single flex module with separatorSingle flex module with separator, heater and pumpQuadruple flex module

Single flex module with separator (excluding heater and pump)

Single flex module with separator, heater and pump

Quadruple flex module with separators, heaters and pumps

Water seal and displacement water inlet

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 peripheryand are intermittently discharged by the high-precision 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.

Optional equipment

Flex separation systems based on S-separators 805/815 can be complemented with the following equipment:

  • Starter (included in module versions)
  • Heater
  • Space heating
  • Additional thermometers
  • Vibration switch
  • Feed pump (see feed pump delivery options below)
  • Strainer
  • Flow regulating system
  • ludge removal kit
  • Sludge outlet butterfly valve kit
  • team shut-off valve kit
  • Air pressure reducer valve
  • Pipe arrangement for multiple modules, including heater cross-connection
  • Emergency safety shutdown
  • emote monitoring

Feed pump options


System Layout

System Layout


A preventive maintenance programme using Alfa Laval Service Kits ensures safe and easy maintenance.

Recommended maintenance intervals:
Intermediate Service every 2 000 hours or 3 months
Major Service every 8 000 hours or 12 months
Service kits contain all necessary spare parts for each service and tips for maintenance at regular intervals:
Intermediate Service Kit with O-rings and seals for separator bowl, inlet and outlet
Major Service Kit with parts for drive system, belt, bearings and friction pads
The System Manual includes detailed information in electronic or printed form:
Installation instructions
Operating instructions
Alarms and troubleshooting
Service and spare parts
Commissioning and technical services, including startup assistance and advice on operation and maintenance, are available from all Alfa Laval offices
Training in all aspects of oil treatment, freshwater generation and heat transfer is available
All services can be incorporated into specially tailored Nonstop Performance packages. Details are available from local Alfa Laval offices

Max. Recommended Capacity, l/h on HFO 380 cSt/50°C

max capacity

Technical Data

Main supply voltage3-phase, 220 V up to 690 V
Control voltage1-phase, 100/110/115/230 V
Frequency50 or 60 Hz
Control airMin 5 bar, max 8 bar
Operating water pressureMin 2 bar, max 8 bar
Flex SystemSize (height x width x length)*Net Weight*
P 805928 x 750 x 1035286 kg
P 815928 x 750 x 1035293 kg

* Dimensions and weights for Flex systems do not include control cabinet.

Flex ModuleSize (height x width x length)**Net Weight**
S 8051750 x 750 x 1075433 kg
S 8151750 x 750 x 1075438 kg

** Dimensions and weights for Flex modules do not include pump and heater.

More Information
Flow (L/H)1950