Components of a Comprehensive Aviation Fuel Transfer System
Aviation fuel transfer projects comprise five core segments: fuel depot reception and storage, on-site pipeline networks, apron refueling systems, measurement/control and security systems, and auxiliary support systems. These cover the entire process from fuel arrival at the facility to aircraft refueling, making them suitable for airport fuel depots, intermediate storage depots, and runway/apron fuel supply infrastructure.
I. Aviation Fuel Reception and Storage System (Fuel Depot Core Area)
Responsible for receiving aviation fuel via rail, road, or sea, as well as settling, storage, and blending to ensure fuel quality.
Fuel Reception Unit
Rail unloading trestles / road unloading loading arms, unloading pipelines, quick-connect couplings, filters, static electricity elimination devices
Unloading pumps, vacuum tank-stripping systems, vapor recovery branch pipes
Metering devices: mass flow meters, standard pipe provers, samplers
Storage Tank Area
Atmospheric pressure dome-roof / internal floating-roof aviation fuel tanks (internal floating decks to reduce evaporation)
Tank accessories: manholes, light holes, gauging hatches, level gauge nozzles, inlet/outlet nozzles, clean-out hatches
Auxiliary equipment: tank-bottom drain valves, flame arresters, breather valves, hydraulic safety valves, static grounding
Tank Area Pre-treatment Facilities
Settling tanks, blending tanks, slop tanks, recovery tanks
Automatic tank-bottom drainage devices, oil-water separation basins
Tank Area Protection
Firewalls, partition walls, impermeable liners, oil collection trenches, emergency oil collection basins
II. Pressurization and Transfer Pump Station System (Intermediate Pumping Core)
Provides stable pressure for long-distance pipeline networks and apron fuel supply; comprises fuel transfer pump stations and intermediate pump stations. Main Oil Transfer Pump Units
Centrifugal pumps (featuring leak-free mechanical seals designed for aviation fuel); standby configuration (one active/one standby or two active/one standby)
Variable frequency drive (VFD) units and soft-start cabinets to stabilize discharge pressure
Piping and Valve Assemblies
Inlet gate valves, outlet check valves, shut-off ball valves, pressure-relief bypasses, and recirculation/pressure-regulating lines
Emergency shut-off valves (pneumatic or electric; automatic closure interlocked with fire detection systems)
Filtration and Separation Units (critical for aviation fuel purification)
First-stage coalescer filter: removes water and large particulate impurities
Second-stage separator filter: separates free water; equipped with water detection sensors
Filter element differential pressure monitoring, automatic drain valves, and wastewater collection tanks
Pressure Safety Components
Safety relief valves, accumulator/stabilizer tanks, pressure buffer tanks, and unidirectional dampers
Auxiliary Components
Upstream coarse strainers, vacuum relief valves, static electricity bonding jumpers, and grounding electrodes
III. On-site Oil Transfer Pipeline Network (Depot to Apron Main Lines)
Enclosed pipeline network installed underground or in trenches, organized into a three-tier system: main lines, branch lines, and lateral lines.
Transfer Pipelines
Seamless steel pipe (API 5L Gr.B); external anti-corrosion coating (3LPE/FBE); cathodic protection
Sectional vent pipes, air release valves, and low-point drain valves
Pipe Gallery/Trench Accessories
Expansion joints, fixed anchor blocks, sliding supports, and impermeable trenches
Road/runway crossings (casing pipes and sealing)
Zonal Isolation Valve Chambers
Main-line emergency shut-off valves and zonal isolation valves to enable sectional maintenance and leak isolation
Recirculation/Return Lines
Return lines from apron laterals to the depot to prevent water accumulation and impurity sedimentation in stagnant fuel
Pigging Facilities
Pig launchers/receivers and pigging bypasses for periodic removal of gum and sediment from pipe walls
IV. Apron Aircraft Refueling System (Terminal Refueling Units)
Two primary methods: tanker-based refueling and hydrant-based refueling (underground pit refueling); large hub airports predominantly utilize hydrant systems. (1) Hydrant Refueling System (Fixed Apron Fueling)
Apron branch piping, refueling hydrants, quick-connect couplings, hydrant isolation valves
Refueling control module: pressure regulating valve, high-precision in-line flow meter, filter, water detector
Refueling hose, refueling loading arm/nozzle, aircraft interface coupling, dry-break coupling (leak-proof)
Static grounding clamp, spill protection, automatic overpressure shut-off device
(2) Tanker-based Refueling Support System
Fuel depot loading gantry, loading arm, loading metering unit, loading filter
Refueling tanker systems: vehicle-mounted pump, filter-separator, flow meter, fuel tank, hose reel
V. Measurement, Control, Metering, and Automation Systems
End-to-end digital monitoring, metering, and interlocking protection; serves as the "brain" for safe operations. Metering Systems
Inbound metering: Mass flow meters for rail/road loading and unloading
Outbound transfer metering: Main pipeline flow meters in the pump house
Apron refueling metering: High-precision volumetric/mass flow meters with temperature and pressure compensation
Standard metering calibration piping and verification devices
Instrumentation and Sensing Units
Level: Magnetostrictive level gauges, radar level gauges, high/low-level switches
Pressure: Pump inlet/outlet pressure transmitters, pressure switches (overpressure/low-pressure alarms)
Temperature: Product temperature sensors for volume compensation
Water quality: Filter water probes, tank-bottom oil-water interface meters
Leakage: Fiber-optic pipeline leak monitoring, spill detection probes for underground pits
PLC/DCS Automation Control
Central control console, remote HMI/workstation, SCADA monitoring interface
Automatic interlock logic:
Excessive water accumulation in filters → Automatic pump shutdown and valve closure
Pipeline overpressure → Pressure relief/recirculation and pump shutdown
Fire alarm → System-wide emergency shutdown
High/low-level interlocks for starting/stopping oil transfer pumps
Communication and Data Management
Metering data storage, automatic upload of refueling records, energy consumption statistics, product inventory logs
VI. Fire Protection, Security, and Environmental Protection Systems (Safety Assurance)
1. Fire Protection System
Fixed foam fire suppression system (foam generators in tank farm, foam concentrate tanks, fire pump house)
Fire hydrant piping network, portable dry powder fire extinguishers, fire blankets
Fire detection: Smoke detectors, heat detectors, infrared flame detectors, combustible gas detectors
2. Anti-static and Explosion-proof Systems
Static bonding across all piping; reliable grounding for storage tanks, pumps, and filters
Explosion-proof electrical equipment: Motors, instruments, lighting, and junction boxes
Hydrocarbon vapor concentration monitoring, forced ventilation facilities
3. Environmental Protection and Wastewater System
Oily wastewater piping network, oil interceptors, oil-water separation units
Vapor recovery units (for unloading, tank breathing, and loading operations)
Hazardous waste collection: Spent filter elements, waste oil collection tanks
4. Security and Surveillance
Video surveillance, perimeter intrusion detection, access control systems, emergency stop buttons.
VII. Auxiliary Utility Systems
Water Supply and Drainage: Process water, fire-fighting water supply, and pipeline networks for rainwater/oily wastewater.
Power Supply and Distribution: High-voltage distribution room, low-voltage explosion-proof distribution, backup diesel generators, and UPS (for central control and instrumentation).
Compressed Air System: Air compressors and air storage tanks supplying air to pneumatic valves and shut-off valves.
Maintenance Facilities: Nitrogen purge connections, maintenance platforms, lifting equipment, and tool storage.
Heating and Ventilation: Explosion-proof ventilation for pump rooms and instrument rooms; winter freeze protection (electric or steam heat tracing for pipelines).
Brief Process Logic
External aviation fuel intake → Receiving system (filtration and metering) → Storage tanks (storage and settling) → Transfer pumps (pressurization) → Pipeline filtration and dehydration → Long-distance pipeline network → Apron refueling islands/refueling trucks → Aircraft refueling; fully automated monitoring and control with fire and security safeguards; centralized recovery and treatment of waste oil, hydrocarbon vapors, and oily wastewater.
