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The BOATSPRAY 50 is a small portable diesel powered dispersant pump unit which is designed for operation from small Tugs and Workboats and other specialised vessels using a variety of application equipment including Spray Arms, AFEDO™ Nozzles and Hand Lances. The system is designed for the application of either concentrated (neat) or diluted dispersant and is available with an extensive range of options as described below.  These options allow the system to be configured to meet specific customer and operational requirements at the most cost effective prices


Operation from small and medium size vessels (15m – 40m+) operating inshore.

View Features View Technical Specs View Available Options


  • Single-cylinder, air cooled direct injection Yanmar diesel engine
  • Fully customisable to required specification
  • Compatible with Spray Arms, AFEDO™ Nozzles and Hand Lances
  • Robust construction in stainless steel with gunmetal and stainless steel pipework
  • Fully variable outlet flow
  • Pressure gauge

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Technical Specification

Pump Unit (Neat or Dilute Spraying)

Motive Unit:  Diesel Engine with Recoil Start.
Pump:  Roller Type Positive Displacement Pump with 50 LPM Output.
Pipework: Gunmetal Manifolds and Stainless Steel Fittings.
Eductor: Proportioning type (0-20%)
Frame:  Stainless Steel.
Valves (Manual): 1 No. Eductor Shut Off Valve
1 No. Dispersant Control Valve
1 No. Recirc Flow Control Valve
Pressure Relief Valve:  0 to 10Bar.
Pressure Gauge: Dual Scale


  • Reliable and robust pump units
  • Corrosion resistant
  • Adjustable application rates
  • Portable, “vessel of opportunity” capability
  • Neat or dilute spraying up to 30% of total outlet flow

Available Options

Dilute Spraying Option

Dispersant can be applied in concentrated form ie straight from the drum or diluted in sea water. This option uses an Ayles Fernie designed proportioning eductor to mix dispersant at up to 30% concentration in sea water.

Dilute Flow Rate Indicator (FRI)

If the Dilute Option is selected, an FRI is recommended to indicate the flow of dispersant and to setup the required application rate.

Outlet Flow Rate Indicator (FRI)

In order to set the appropriate flow rate to the application devices ie spray arms, AFEDO™ nozzles or hand lances, it is recommended that an Outlet FRI is fitted to indicate the outlet flow.

Pump Unit Wheel Kit

This removable wheel kit allows the pump unit to be moved about easily by one person and once in position, the wheels can be removed for securing the pump unit on deck if required.

Engine Spark Arrester

The diesel engine can be fitted with a spark arrester to prevent the production of sparks from the engine exhaust.

Pump Unit PVC Cover

We strongly recommend the pump unit cover to protect the unit from weather and deterioration in the highly corrosive marine environment.

Pump Unit Lifting Sling

The pump unit can be supplied with a load tested lifting sling

Aluminium Spray Arms

The BS50 pump unit can be operated with 4m or 6m Spray Arms

Nozzle Downpipes

If Spray Arms are used with the BS50 pump unit, it is likely that Nozzle Downpipes will be required to position the nozzles at the correct height above the water surface.

WingJet Nozzles

The Spray Arm “swath width” can be extended by the use of WingJet Nozzles which are fitted at the outboard nozzle position.

AFEDO™ Nozzles

The AFEDO™ Nozzle is a specially designed nozzle which creates an even drop-out spray pattern and provides an effective alternative to spray arms. See the Application Systems and Equipment page on this website for a full description of the AFEDO™ Nozzle.

Trigger Operated Hand Lances

When dispersing small patches of oil or cleaning structures coated in oil, Hand Lances provide a useful tool for controlled use of dispersant in these circumstances. The Hand Lances are supplied with hoses and fittings for fitting directly to the BS50 Pump Unit.

Recommended Spares

A comprehensive range of spares is available for the pump unit, hand lances, spray arms and the AFEDO™ Nozzle.

Pump Spares

A pump overhaul kit can be supplied which includes all necessary components for repairing a damaged or worn pump.

BS50 Aluminium Storage Container

When the BS50 system is supplied with AFEDO™ Nozzles, they can be conveniently stored in aluminium storage containers. These containers provide secure storage for all system components which protects the system from deterioration, damage and theft. These containers are very popular with oil companies and oil spill responders who need to move the systems quickly and securely from location to location and from ship to ship.

Protective Clothing

We recommend that system operators (particularly when using AFEDO™ nozzles) wear the appropriate protective clothing. This option includes; coveralls, goggles, gloves and respirator.

Oil Dispersant

Ayles Fernie will be pleased to recommend a suitable dispersant.

Portable Dispersant Tanks and Manifolds

The storage of dispersant and the supply of the dispersant to the pump unit is crucial for the effective operation of the system. Ayles Fernie can supply these tanks and manifolds for connecting tanks together.