Separator Cartridges Filter System

Separator Objec

Fuel passing through the filter elements can generate static charges. Adequate relaxation time must be provided by the system design to allow the separated charges to recombine. The generally accepted relaxation time is 30 seconds between the filter and the discharge outlet. The required relaxation can be accomplished by utilizing adequate pipe length or through the use of relaxation chambers.

Improper filling of filter/separator vessels has also been known to cause fires or combustion in the vessel. The flash fires can occur by pumping fuel into the vessel when it is empty. The fuel flowing through the filters can create electrostatic charges and the empty vessel will have plenty of air inside to support combustion.

Evidence of combustion can usually be seen in the form of burned areas on the elements or blackened spots on the walls or domed lid of the vessel. Operating personnel should be properly instructed in changing filters and refilling the vessel. Vessels should be refilled slowly. Filter vessel manufacturers should be consulted for their recommended practice. Static charging usually increases as fuel flow velocity increases through the element.

Separator Cartridges Filter

unloading area should be provided with concrete aprons designed to contain spills and direct them to an oil/water collection system. The design and layout should be in accordance with all applicable local environmental codes. Raised concrete islands or curbs are recommended to help protect all associated unloading equipment from vehicular collision. Bollards may be used to further protect equipment from damage. Unloading hose adapters should be provided that are appropriate for the type of aviation fuel being received and should be non-sparking. These systems should be provided with Emergency Fuel Shut-off System to stop the flow of fuel in event of an emergency or fuel spills. Receiving systems should be interconnected to high-level alarms on the storage tank to prevent over-filling the tank.

Electrical equipment used should be rated for the degree of hazard. Check with local and national codes to determine the requirements. Even though Jet A and Jet A-1 are combustible liquids, the National Fire Protection Association (NFPA) requires all electrical equipment and wiring to meet the requirements of the National Electrical Code NFPA 70, Article 515, utilizing the Class I liquids requirements for all applications. This is because jet fuel when heated or stored above its flash point can give off significant levels of flammable vapors. This would be especially true in the tropic or sub-tropic regions.