GSE25march2002

TRD Gas System Ground Operations: 

TRD Gas System Ground Operations Peter Fisher MIT March 25, 2002

TRD Gas System: 

TRD Gas System Plumbing Design - A simplified circuit diagram of the TRD gas system is shown in the following figures - The gas supply system consists of Xe/CO2 in an 80:20 mix Structural Materials - Tanks: Composite over-wrapped stainless steel - Lines and fittings: stainless steel (welded connections)

TRD Gas System (Cont): 

TRD Gas System (Cont) Schematic Arrangement of the AMS-TRD gas system. All pressures are given at 25 C. TRD 300 Liters Manifolds Box C Box S CO2 940 psia 17.6-20.4psia Mixing Vessel 200 psia Xe 1550psia

Slide4: 

TRD Gas Supply Mounted to USS-02

Slide6: 

Xe Bottle: 1550psia CO2 Bottle 940psia V10a V1a V20a V3a V4b V4a V5 V3b V2a V20b F3a P1a V2b V1b P2b RV3-300psi V10b D Vessel (Mix) F1a O1a 60cc 30cc P1b P2a 7 liters per day to Box C O1b F2a F3b F2b 15cc 30cc VG1a VG1b F1b Figure 2: Box S Diagram RVG1b-1200psi RVG1a-2800psi CO2 Xe Ground Equipment Ground Equipment V17a V17b

TRD Gas System (Cont): 

TRD Gas System (Cont) Ground Equipment Purifier CO2 Analyzer P5 RV4 – 29psig P3 CP2 CP1 V8B V8A RV5-200psig P4 To Manifold From Manifold From Box S (From V4a) From Box S (From V4b) V18a V18b V6b V6a V9a V9b

Slide8: 

TRD Gas System (Cont) TRD segment There are a total of 41 segments fed in parallel from the manifold. TRD Segment n From Gas System To Gas System PMnB PMnA VMnA VMnB VMnC VMnD 430 cu. in (7 liters)

TRD Gas System (Cont): 

TRD Gas System (Cont) Fittings and Connections - All tubes in the TRD gas system are 3 mm or 6 mm outer diameter stainless steel tubes - Connections are made with welded joints (as an alternate metal sealed fittings will be used) - Connections between the gas manifolds and the TRD segments are made with 1 mm inner diameter PEEK tubing and metal connectors

TRD Gas System (Cont): 

TRD Gas System (Cont) Design and Operating Pressures - Xe Tank - Maximum Design Pressure/Maximum Expected Operating Pressure (MDP)/(MEOP) = 3000 psid - Min./Max. design temperature = -60 F to +150 F (-51C to +65C) - Relief valves setting = 2800 psid - Normal Operating Pressure = 1550 psid - Normal Operating Temperature = 77 F (25 C) - Proof test factor = 1.5 x MDP - Minimum burst factor = 3.1 x MDP

TRD Gas System (Cont): 

TRD Gas System (Cont) Design and Operating Pressures (Cont) - Xe Tank (cont) - Outside diameter = 15.37 in. - Volume = 1680 in3 - Tank weight = 17 lbs - Weight of Xenon = 109 lbs (max.) - External load test performed to 8.9 Grms at 0.08 g2/Hz all axes - Material is composite over wrapped stainless steel

TRD Gas System (Cont): 

TRD Gas System (Cont) Design and Operating Pressures (Cont) - CO2 tank - Maximum Design Pressure/Maximum Expected Operating Pressure (MDP)/(MEOP) = 3200 psig - Min./Max. design temperature = -100 F to +300 F (-73 C to +149 C) - Relief valves setting = 1200 psig - Normal Operating Pressure = 940 psid - Normal Operating Temperature = 77 F (25 C) - Proof test factor = 1.5 x MDP - Minimum burst factor = 2.125 x MDP

TRD Gas System (Cont): 

TRD Gas System (Cont) Design and Operating Pressures (Cont) - CO2 Tank (cont) - Outside diameter = 12.42 in. - Volume = 813 in3 - Tank weight = 9.5 lbs - Weight of CO2= 8.5 lbs (max.) - External load test performed to: - 8.9 Grms at 0.07 g2/Hz (axial) - 4.5 Grms at 0.02 g2/Hz (lateral) - Material is composite over wrapped stainless steel

TRD Gas System (Cont): 

TRD Gas System (Cont) Design and Operating Pressures (Cont) - Mixing Tank - Cylindrical Pressure Volume - Maximum Design Pressure/Maximum Expected Operating Pressure (MDP)/(MEOP) = 300 psig - Min./Max. design temperature = -100 F to +300 F (-73 C to +149 C) - Normal Operating Pressure = 200 psia - Normal Operating Temperature = 77 F (25 C) - Proof test factor = 1.5 x MDP - Minimum burst factor = 4.0 x MDP - 1 Liter Volume - Manufactured by ARDE (ARDE SKC 13181)

TRD Gas System (Cont): 

TRD Gas System (Cont) Design and Operating Pressures (Cont) - TRD Straws - Maximum Design Pressure/Maximum Expected Operating Pressure (MDP)/(MEOP) = 29.4 psid - Min./Max. design temperature = TBD - Relief valves setting = 29.4 psid - Normal Operating Pressure = 14.7 to 17.5 psia on orbit; 17.6 to 20.4 psia on ground - Normal Operating Temperature = 77 F (25 C) within +/- 1 C delta temperature throughout entire TRD - Proof test factor = 1.5 x MDP - Minimum burst factor >/= 2.0 x MDP

TRD Gas System (Cont): 

TRD Gas System (Cont) - TRD Straws (cont.) The Xe/CO2 mixture is circulated through these tubes in a continuous loop Each manifold is connected by pressure controlled isolation valves at the inlet and outlet to box C The density and purity of the gas mixture is monitored and corrected to ensure efficient photon detection

TRD Gas System (Cont): 

TRD Gas System (Cont) Pressure System Operations - Box S will be mounted to the USS-02 on the ISS wake side - Box C will be mounted near/on box S as a separate assembly - Tank Design - The Xe tank is already in use on the ISS as the Plasma Contactor Unit (PCU) - The CO2 tank is used on X-33 nitrogen tanks - Stress and fracture analysis on the Xe tank was done by Boeing, Canoga Park

TRD Ground Operations: 

TRD Ground Operations TRD testing Verify system operation Filling Transfer Xe, CO2 from standard 25 l gas bottles to Box S storage vessels Recovery Trasnfer Xe from Box S to standard 25 l gas bottles

TRD testing: 

TRD testing Need to fill 350 l TRD straws from standard 25 l bottles for testing Circulate through external filter, remove O2 Recover gas after use Standard procedure, will be carried out many times during construction

Slide20: 

Recovery System RGA VH2 VH3 PH3 VH4 VH5 VH8 VH6 10 liter Bottle PH4 VH1 VH0 30cc Bottle RVH0 1 liter Bottle 25 liter Bottle PH1 PH0 PH2 Regulator Rotary Vacuum Pump VH7 To box S Sorption pump 2800 psid

Slide22: 

Recovery System Xe in TRD stored in Box S at high pressure - 1550 psia Expensive $10/l Need to be able to Transfer into Box S vessel from standard bottles Recover from Box S vessel to standard bottles Monitor gas composition in detail (Residual Gas Analyzer, RGA)

Recovery system operations - filling Box S vessel: 

Recovery system operations - filling Box S vessel Open standard 25 l bottles to Box S vessel, pressure equilibrates ~1000 psia Seal Box S vessel Condense Xe from 25 l bottle to 10 l bottle, seal 25 l bottle, open to Box S vessel Repeat with 1 liter, 30 cc bottle

Recovery system - recovering procedure: 

Recovery system - recovering procedure Seal TRD straws Open Box S vessel to cold 25 l standard gas bottles Xe condenses Seal storage vessels

TRD Ground Operations Equipment: 

TRD Ground Operations Equipment Recovery system (as shown) Supply of LN2 Vent/take-away for N2, Xe, CO2 Electrical power Connecting plumbing Standard gas bottles