Presentation on theme: "Airfield Lighting Designs Salt Lake City International Airport"— Presentation transcript:
1Airfield Lighting Designs Salt Lake City International Airport John Burns, PEPenn State/FAA Hershey Conference 2009AcknowledgementsKevin Robbins, PE SLC Dir of EngineeringMike Widdison, PE SLC Civil EngineerSteve Smith, PE SLC Civil EngineerDoron Lean – Burns Engineering
2Airport BackgroundFour Runways (2 Parallel 12,600’, R/W 17-35, & R/W 14-32)Airport is FAA approved for CAT III-B Operations.4 CAT III-B Controllable Stop Bars at both ends of each of parallel runways.2 CAT III-B Lead-Across Stop Bars at H5 & H10.Majority of the SMCGS upgrade was performed under retrofit conditions.
3Presentation Overview Due to complexity of SMCGS system and overall airport operations airfield lighting design is incorporated & coordinated early into the planning and conceptual design.Presentation will review three (3) sample projects of innovative Electrical coordination performed in the early design process.Result: Significant cost savings and optimization of construction budget.
4Runway 34R-16L – Case Study 1Airport’s main operational runway. Closure significantly impact’s Airport’s operations.Runway inpavement lights (R/W CTL and TDZ) were originally retrofitted in existing asphalt in early 90’s.2007: Due to deteriorating pavement, a 4” mill and overlay was required.Major issue: Majority (±400) of base cans were originally installed with short extensions that could not accommodate 4” mill.Several options:Hand-mill. (Very expensive & time consuming).Replace 400 base cans that do not accommodate milling.Cut base can and retrofit base new base can. No guaranteed or warranted.Raise runway elevation to accommodate cans.
5Runway 34R-16L – Case Study 1SLC Maintenance, Engineering, & Burns developed a base can height profile to be overlayed on the mill/asphalt profile to analyze how much overlay is required and potential savings.799 Base cans opened and measured over a 14 night period (11:00 p.m. to 6:00 a.m.).Simple measurement system to quickly and accurately measure the base can height.Elevation profile was created across every base can for Runway Centerline & Runway TDZ.
6Problem: Base cans in the way Existing GradeNew GradeElevationBase Can HeightMilled SurfaceR/W CTL #11R/W CTL #13R/W CTL #1R/W CTL #2R/W CTL #3R/W CTL #4R/W CTL #5R/W CTL #6R/W CTL #7R/W CTL #8R/W CTL #9R/W CTL #10R/W CTL #12Challenge:Can’t raise runway too muchFix runway humpsOverlay as close to 4” as possibleMinimize disruption to operation or number of base cans removed
7Solution: Revise Profile Runway slightly raised in certain spots by no more than 1”Existing GradeNew GradeElevationMilled SurfaceBase Can HeightR/W CTL #1R/W CTL #2R/W CTL #3R/W CTL #4R/W CTL #5R/W CTL #6R/W CTL #7R/W CTL #8R/W CTL #9R/W CTL #10R/W CTL #11R/W CTL #12R/W CTL #13Result:Schedule impact significantly reduced350 fewer cans were removed, approximately $400k savingsEfficient milling operation
8Runway 34R-16L – Case Study 1 Light base after milling Light base removal
9Other FactorsTo Meet Slope Requirements parts of shoulder were milled and overlaid.Navigational aids were analyzed such as ILS/Glideslope/ALSF/PAPI to ensure impact of slight raise was within standards. Flight checked and passed as a precaution.
10Coordination of T/W CTL and Concrete Joints – Case Study 2 Challenge:Reconstruct center four panels only with 20’ x 20’ panelsOld concrete panel size is 25’ by 25’.Centerline light radius and spacing fixed in existing panelsMany joint conflict with new panel size,Base cans must be at least 2.5’ from light center to concrete jointWould require block-outs at Concrete Joints or Partial panel replacements.Existing Panels (25’ x 25’)T/W 12.5’New Panels (20’ x 20’’)
11Coordination of T/W CTL and Concrete Joints – Case Study 2 Solution: Proposed to use FAA’s L-852K fixture for radius lights.Fixture allows for 25’ (+/- 10%) spacing while still meeting RVR <1,200’ requirements.Fixture is toed in on both sides of fixture.Photometrical L-852K can be seen from 25’ away as much as L-852D fixture can be seen from 12.5’. (Refer to DOT/FAA/AR-TN06 for photometric data)L-852DL-852KPictures courtesy of DOT/FAA/AR-TN06
12Case Study #2 - SolutionL-852K fixtures: Improved coordination with concrete joint panels.Less maintenance due to fewer fixturesLess construction cost due to fewer fixturesCan be used in conjunction with L-852D, do not have to retrofit entire Airport.Existing Panels (25’ x 25’)New Panels (20’ x 20’)T/W 25’
13Light Intensity and Vault Capacity – Case Study 3 Issue #1:Delta Airline Pilots complained that:(a) lights are too bright at low intensity of 3 Step Operation(b) Centerline are not energized all the time.Airport configured with 3 Step CCR for taxiway centerline lights.Centerline lights are only energized during RVR conditions requiring taxiway centerline lightsIssue #2:Existing Vault was approaching physical capacity and could not accommodate future Airport growth. (Deicing Pads, Parallel Taxiway)Terminal Redevelopment location was unknown and building a new vault would not only be expensive but also might be in the way of future construction.
14Light Intensity and Vault Capacity – Case Study 3 Issue #1: Light IntensityDecision was made to operate T/W CTL at all times under 5 step operation. (Step 2 for VFR Conditions)Majority of existing CCRs were original “LC” type CCRs configured for 3 step operation. CCRs could not be readily converted to 5 step operation.CCR 5 Step OperationCurrent(Amps)Photometric ValueTaxiway L-852C(Measured Values CD)56.6400 cd45.2100 cd to 180 cd34.120 cd to 40 cd23.42.4 cd to 12 cd12.80.6 cdto 6.6 cd.CCR 3 Step OperationCurrent IntensityNominal Setting (Amps)Photometric ValueTaxiway L-852C (Measured Values CD)36.6400 cd25.5120 cd to 200 cd14.840 cd to 80 cd
15Light Intensity and Vault Capacity – Case Study 3 Issue # 2 – Vault CapacityNew 5 step Ferro type CCRs are larger than 3 step LC CCRsPhysical space to build a second stack for CCRs limited.Physical modifications to enlarge vault not practical.New terminal location is not known. Airport hesitant to build new vault because it might need to be razed within 10 years.Seismic #4 rated.Agenda
16Main Vault Configuration East and West Vault rooms are similarExisting configuration has 4 rows of double-stack CCRsAlso has 3 Rows of single, large Ferro CCRsSiemens ACE Units.Agenda
17Light Intensity and Vault Capacity – Case Study 3 Cost to provide new CCRs to accommodate 5 Step Operation: $1.1 Million.Directive:Design 5 step system and provide for future expansion at or near $1.1 million budget.
18Solution: Agenda Utilize switchgear CCR system on half of the rows Advantages:Minimizes space requirements. 14 CCRS can be installed on 20’ long by 4’ wide by 8’ high space.Use stag connectors to pull CCR in/out and replace easily.Minimizes overhead connection points as all wiring goes into an incoming power bay and is transferred via bus bars to the powerpacks.Dis-Advantages:Future upgrades are sole-sourced to mfg. that wins initial project.Agenda
19Sequential Phasing Agenda 12 Phasing steps to ensure all circuits remain energized during nightime operations (7:00 p.m. to 7:00 a.m.)Agenda
20Early PhasesTemporarily consolidate load on spare and other CCRsRemove CCRs to make space for switchboard CCRsAgenda
21Later Phases Install Switchgear CCRs Reconfigure circuits to new switchgear regulators
22Final Configuration 5 step CCRs provided for T/W centerline lights Increased space for future regulatorsFuture SGRS
23Result 5 step CCRs provided for T/W centerline lights Increased space for future regulators# of Future CCRs CapacityEast SideWest SideTotal # of Future Capacity Created By ProjectFuture CCRs(All Sizes – All Types)323668Space for future CCRs before reconfiguration = 12Switchgear project cost = $1.6 Million vs. New Vault Cost = $7 - $9 MillionReconfiguration will accommodate future growth for next 15 years at a fraction of the cost to expand the vault
24SummaryInvestigate height of base can during design and coordinate with pavement overlayUse of L-852-K centerline light fixtures can reduce the concrete pavement joint conflictsSwitchboard regulators can free up space in the vault and possibly eliminate the need to expand building