© 2020 hansaconsult. All Rights ReservedJet Fuel Leakage Archive
Tigtness Control SystemHighlightsWHY TCS®Approved & Recommended by worldwide leading Third Party Organizations (TÜV, KenWilcox Associates and other prestigious organizations)On modern airports refuelling of aircraft is carried out by using hydrant systems.These underground pipe networks are used to transport fuel Jet-Al to the individual aircraft pit.In the event of a leak, fuel can contaminate huge amounts of soil and ground water. No one wants to see a case like below picture.Remediation measures and associated cost represent an almost unpredictable financial and image risk for operators and owners.Therefore, the tightnessof hydrant systems has to be accurately monitored.The Online Monitoring Module continuously monitors pressures in the hydrant system and detects accident conditions that do not occur during regular operation. It is not the exact detection of the leak size that is important, but the speed of detection of the danger and the immediate initiation of the emergency procedure.Very small changes of fuel temperature result in large pressure changes (0,1°C~1 bar).Safe detection with Pressure-Step (PS) and Pressure-Temperature (PT) MethodsFull compliance with International Standard. I1540/EI1560 / JIG 2Maximum reliability of 0,004 % per line volume(guaranteed detectable leak) in PS-Method organizations4 5 61 2 3....1
OTHER FEATURES.....8 L / Hour 5,760 L / MONTH69,120 L / YEAR 192 L / DAYTCS® Automation for automated leak detectionFully automated test cycleDaily control of tightness during overnight non-refuelling periodsShort analysis test cycle (≈ 45 min)Integration into all standard visualization and automation systems (SCADA) via OPC-interfaceTCS® Mobile for the accurate leak detection without automationRISK EXAMPLE......2
TYPICAL APPLICATION • Daily Control - PT Method (Pressure Temperature) PT MethodBENEFITSChallenges• Maximum accuracy (4 L/pipe volume /hour)• Long test cycle (no refuelling operation)Pressure transmitters: one for each pipeline section• Computer and peripheral equipment for evaluation and documentation of test results; • Tight closing valves (e.g. DBBV). OPC to standardize data communication• TCS® is built on Windows NT Technology and features an OPC-interface. • OPC stands for “ole for process controls” and is an open interface standard.PS Method (Pressure Step)BENEFITS • Maximum accuracy (0,004% /pipe volume /hour) • Short test cycle (approx. 45 min for all sections) TCS® PRINCIPLEThe pipeline is divided into perfectly tight sections and pressurized at two different pressure levels. The volume of each single section limits the test. • Temperature along the pipeline has to be measured at numerous underground spots.The world-wide patented Pressure-Step-Method (PS) is the state-of-the-art and the absolutely reliable leak detection procedure. Graph - 01 : Principle of PS-MethodDaily Control PT Method (Pressure Temperature)The section of the pipe to be tested by Pressure -Temperature-Method (PT) is pressurized.The changes of pressure and temperature during several hours gives evidence about the tightness of the system.Means for pressurization and depressurization of each pipeline section to create required test pressures (main pump, jockey pump).Precision data acquisition with hansaconsult high performance AD Converter and transmission system.TCS® SYSTEM COMPONENTS .. .. SCADA system for automatic control of the hydrant system. It is recommended that the SCADA system provide an OPC interface (OLE for Process Control) for communication. OPC allows a standardized data exchange of applications and field instruments resulting in an easy integration of hardware and software products of different suppliers. ......3
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hansaconsult warrants that the TCS® (PS and PT methods) shall be capable of detecting leakages in buried pipelines - which are absolutely free of air and absolutely tightly closed at the moment in time at which the leakage detection operations commence - with a detection accuracy of 0.04 liters per hour and per cubic meter test volume and with a detection probability of 99% in conjunction with four consecutive measurements if measurements can be received every 2 seconds during the measurement cycles.• TCS® Warranty5
WindowsOperating SystemPressure measurements are performed in three cycles:First cycle: Increase pressure from operational to high level, allow stabilization, then record measurements.Second cycle: Decrease pressure from high to low level, allow stabilization, then record measurements.Third cycle: Increase pressure from low to high level, allow stabilization, then record measurements.Finally, return the pressure to the operational level.No leak (blue lines): ΔP between set points is uniform.Leak (red lines): ΔP between set points varies.•••••••6
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