Presentation on theme: "Solid Rocket Booster Processing"— Presentation transcript:
1Solid Rocket Booster Processing Kennedy Space CenterSRB Mechanical EngineeringNE-M7
2KSC – Solid Rocket Booster (SRB) Processing Areas Shuttle Processing and LaunchPostflight Hardware Recovery and Evaluation
3KSC – Solid Rocket Booster (SRB) Processing Areas PadVABRPSF
4KSC – Solid Rocket Booster (SRB) Processing Flow RecoveryDisassembly and AssessmentDesign CentersElement Refurbishment and ManufacturingLogistics and ShippingDeliveryOffload and InspectAft Booster BuildRPSFSRB RETRIEVALSHIPSHUTTLELANDINGHANGAR AFORBITER PROCESSINGFACILITYSRB STACKINGField Joint MateLeak TestField Joint Protection SystemS&AOffloadBuildupET/SRBOPERATIONSINTEGRATEDVEHICLE OPS/VABETSTANDALONELCCHORIZONTALPAYLOAD INTPAYLOAD FACILITIESHYPERGOLICFACILITYVERTICALPAYLOADINSTALLATIONLaunchPad Ops
5Forward Assembly and Aft Skirt arrive from SRB Element in the Assembly Refurbishment Facility (ARF) at KSC.Aft SkirtParachutesARFFrustumForward AssemblyNose ConeFrustumParachutesForward SkirtNose Cone
6Segments arrive from ATK in Corrine, Utah in rail cars Segments arrive from ATK in Corrine, Utah in rail cars. The segments go to the Rotation, Processing and Surge Facility (RPSF) at KSC.RPSF
7At the Rotation, Processing and Surge Facility (RPSF), the rail cover is removed, propellant grain & metal surfaces inspected, the segments are rotated to vertical, secured on a pallet and stored in the surge facilities.Break-over of the forward segment from horizontal to vertical
8Build-up to Aft Booster Configuration (see following charts) At the RPSF, the aft booster is assembled and processed in the build-up stands. Other hardware processed in the RPSF includes: - Stiffener Rings Assembly and Closeouts - Thermal Curtains - External Tank Assembly (ETA) ring and hardware - Thermal Protection System (TPS) closeouts - Systems tunnel and cables installation and closeouts - Heater power cable installation - Nozzle severance cable connectionAEC MateAEC BreakoverAft Skirt MateAft Segment Breakover to VerticalBuild-up to Aft Booster Configuration (see following charts)Aft Booster Build-up Stand
9Pin Retainer Steel Strap Aft Booster Build Stand The aft skirt is placed in the build-up stand and the booster segment is mated. 177 pins are installed and secured with a steel pin retainer strap. The joint is closed out with cork and RT-455 ablative compound.Aft Skirt MatePin Retainer Steel StrapCork BandAft Booster Build StandAft Skirt Clevis
10Aft exit cone is assembled to the forward exit cone at the RPSF. Phenolic mating surfaces are primed with DC1200 primer prior to assembly.Primary and secondary seals (O-rings) are installed.Exit cone is raised on an elevator and floated on an air bearing for mating.The joint is bolted with 96 fasteners.Leak test is performed at 83 and 30 psig with the mass flow meter prior to joint RTV backfill. The joint gap is backfilled (injected) with RTV silicone sealant as part of thermal barrier system.Primary SealSecondary SealPhenolicRTV Thermal BarrierAEC MatePhenolicAft Skirt Not Shown for ClarityAft Exit Cone
11Surge buildings protect hardware from elements (rain, wind, etc.) If needed, the aft booster will be put into surge for storage. The SRM transporter transfers the aft booster from the RPSF to the surge or the Vehicle Assembly Building (VAB) for the stacking operations.Surge buildings protect hardware from elements (rain, wind, etc.)Not climate controlledSegments have weather proof covers on topRPSFSurgeVAB
12The segment is connected to the beam and the 325-ton crane in the transfer isle of the VAB. Circularity measurements, tang preps, metal parts inspections, abrade J-leg, and assemble/connect curtain.
13The aft booster segment is lifted from the transfer isle to the high bay of the VAB to be connected to the Mobile Launch Platform (MLP). The booster is bolted to the hold down post of the MLP with a frangible nut that separates at launch.
14At KSC, the center and forward segments are stacked At KSC, the center and forward segments are stacked. When two segments are mated at KSC, this joint is called a field joint. The SRB forward assembly mated. Then, all field joints are all closed out in the VAB.SRB Forward AssemblyForward SegmentForward Field JointForward Center SegmentCenter Field JointAft Center SegmentAft Field JointAft Booster
15All the field joints are configured with a tang and clevis design with a capture feature. The 3 O-rings and J-leg help prohibit a combustion gas leak at the joints.Field joint is a clevis and tang configuration with 177 pinsThree alignment slots/pins ensure correct segment clockingTang “capture feature” and insulation “j-leg” added during redesignTangTang capture feature “captures” inner clevis leg to limit seal surface movement (joint rotation) during motor pressurizationInsulation j-leg prohibits combustion gas from reaching sealsCapture FeatureField Joint ExampleClevisInner Clevis LegInsulation J-leg
16For a segment mate, the segment is lowered over the SRB stack For a segment mate, the segment is lowered over the SRB stack. The field joint assembly fixture (FJAF) acts as a “shoehorn” to align the tang/clevis and prevent flat-on-flat metal conditions. Leak test of the joint and the vent port plug are the final acceptance of a successful joint mate.Field joint mate with 3 feet between the segments.FJAFO-ringsPSA ApplicationField joint mate with 1/8” between the segments.Segment mates require a controlled environment within the curtain room. Also, the controlled area requires personnel to wear flames, eyes-only hoods, gloves and meet maximum static levels.
17Each field joint is closed out with the field joint protection system (FJPS). The FJPS provides thermal protection, weather protection and retains joint pins.CorkJoint Temperature SensorHeater Retainer Strap and Thermal BarrierJoint HeaterField joint after mate, before FJPSRT-455 AblativeCorkPin Retainer BandRT-455 AblativeField joint with FJPS
18The forward assembly is mated to the forward segment and also closed out with FJPS. Since no propellant is exposed in this mate, a controlled environment is not needed.Forward SkirtCork BandFwd SegmentForward Skirt JPSPin Retainer StrapForward Skirt Joint
19The systems tunnel, cables, heater power cables, and linear shaped charge (LSC) are all assembled and closed out. In addition, TPS, cabling and closeouts are completed in other areas of the boosters.Forward and Center Field Joint Tunnel CloseoutTunnel CoverRT-455Systems Tunnel Closeout LH side (fwd 3 segments)Heater Power CablesCork
20After the boosters are assembled, the external tank (ET) is then brought over from the ET check-out cell in the VAB for the ET/SRB mate.
21Next, the orbiter is mated to the ET with the boosters supporting the weight of the whole shuttle.
22The crawler transports the MLP and the shuttle to the pad where all processing is completed.
23After launch, the boosters separate at around L+128 seconds After launch, the boosters separate at around L+128 seconds. The boosters continue to climb to around 42 miles high. Then, boosters tumble until the drogue shoot deploys at 1600 feet, which orientates the boosters upright. The main parachutes deploy at 6300 ft to slow down the boosters to impact the ocean at about 60 mph. Before impacting the ocean, the aft exit nozzle separates to prevent deformation on the reusable motor.
24The Liberty Star and Freedom Star each retrieve a booster in the ocean to tow it back to Hanger AF at KSC.
25The boosters are received at Hanger AF and evaluated for any off nominal conditions in the post-flight assessment.
26Every aspect of the boosters is inspected and compared to past post-flight data. The segments are disassembled and sent back to ATK and USA.