LNG Liquefaction Facility — System Block Flow Diagram ALPHA LNG Project · 150,000 GPD (Expandable to 300,000 GPD) · South Texas, USA · Ref: P791-09.00 Gas Train / Process Refrigeration LNG Storage & Loading Utility Safety / Flare Main Process Flow Refrigerant Loop Utility PLANT BOUNDARY LIMIT (B/L) GAS TRAIN REFRIGERATION SYSTEMS LIQUEFACTION & SEPARATION LNG STORAGE & LOADING FEED GAS 27.5 MMscfd · 400–800 psig FEED GAS METERING & INLET SEPARATION Flow Metering Skid V-101 Inlet Separator Pressure Regulation PFD-100 Condensate → Drain FEED GAS PURIFICATION Mol. Sieve Dehydration & CO₂ Removal (D-101A/B/C) F-101A/B Dust Filters H-101 Regen. Gas Heater E-101A/B Guard Beds PFD-101 | 3×MS towers, 8hr regen cycle Outlet: CO₂ <50ppm · H₂O <0.5ppm ONLINE GAS ANALYZERS CO₂ Analyzer (0–100 ppm) H₂O Analyzer (0–10 ppm) Gas Chromatograph (6 pts) PFD-101 Continuous quality verify FEED GAS PRE-COOLING MR Pre-Cooler E-204 NH₃ Refrigerant Cooled 98.3 MM Btu/hr duty Air Desuperheaters (loose) PFD-102 Cooled gas → Cold Box FUEL GAS TO FIRING / HEATING SYSTEM AMMONIA REFRIGERATION SYSTEM K-501A/B Screw Compressors 2×50% | 4160V Motor Driven F-501A/B Lube Oil Filters V-501 NH₃ Accumulator V-502 Lube Oil Separator E-502 Lube Oil Cooler Air-cooled Condensers (2 off) PFD-104 | 6000 HP total Closed refrigerant loop MIXED REFRIGERANT (MR) COMPRESSION SYSTEM K-300 / K-302 Centrifugal Compressors 2-stage | 4160V Motor | 2×4800 BHP V-301/V-302 Suction Drums E-303 1st Stage After-cooler E-305 Inter-cooler (NH₃ cooled) E-306 2nd Stage After-cooler V-303/V-305 Phase Separators PFD-103 | IGV control | Seal Gas System High-P MR → Cold Box NH₃ COOL NH₃ RETURN NH₃ REFRIGERANT TO PRE-COOLER E-204 HIGH-P MR REFRIGERANT LOW-P MR RETURN MR STORAGE & MAKEUP SYSTEM C₁, C₂, C₃, N₂ components Outside B/L (owner supply) MR MAKEUP COOLED FEED GAS COLD BOX Brazed Aluminium Heat Exch. (BAHX) E-201 Main Heat Exchanger Design Duty: 10MM BTU/hr V-401/V-506 Flash Drums V-507 Suction Drum MR Expansion Valve Trains LNG Flash & Sub-cooling PFD-102 | LNG product @ −160°C Perlite-insulated cold box vessel Heavy ends → Demethanizer HEAVY ENDS DEMETHANIZER SYSTEM C-201 Distillation Column E-202 Reboiler E-203 Reflux Condenser V-303 Reflux Drum Overhead: CH₄ → Cold Box PFD-102 Bottoms: C₂+ NGL product NGL → outside B/L (optional recovery) NGL / C₂+ PRODUCT OUT BOG COMPRESSOR K-401 Reciprocating 1×100% | Electric Motor 75 HP BHP | Lube Oil Sys. BOG suction from Storage PFD-102 / 105 | 0.47 MMscfd BOG Compressed vapor → feed gas COMP. VAPOR LNG −160°C LNG STORAGE TANK V-401 / TK-01 | Full containment Cap: ~4,200 m³ / 1,100,000 Gallons PFD-105 / PFD-220 | 7-day storage BOG 0.47 MMscfd LNG LOAD-OUT Truck Loading System Metering & Custody Transfer ~5,917 GPD / train | Owner supply LNG INSTRUMENT AIR SYSTEM Compressor + Air Dryers PFD-210 | Owner supply INST. AIR NITROGEN SYSTEM LN₂ Storage | Vaporizers E-401A/B Amb. Vaporizer PFD-230 | Purge / inert gas N₂ PURGE POWER SUPPLY 4160V / 460V | Motor Control 6000 HP / train | Owner supply HV POWER PLC / HMI CONTROL SYSTEM AB / Siemens PLC (100% CPU) Wonderware HMI Workstation Plant-wide DCS integration CONTROL SIGNALS FLARE & VENT SYSTEM HP / LP Flare Headers Knockout Drum PSV / BDV relief routing Owner supply / outside B/L FIRE WATER SYSTEM TK-01 Fire Water Storage MP-101/102 Fire Pumps JP-101 Jockey Pump MP-201/202 Recirc. Pumps PFD-201 | Area deluge coverage FIRE WATER COMBUSTION GAS SYSTEM H-301 MS Regen. Heater Fuel Gas Burners Exhaust Gas Stack PFD-202 | Regen gas service PROJECT: ALPHA LNG · SOUTH TEXAS, USA DRAWING TITLE: SYSTEM BLOCK FLOW DIAGRAM – LNG LIQUEFACTION FACILITY REFERENCE: P791-09.00-PFD-001 thru PFD-230 CAP: 150,000 GPD (EXP 300k) REV: A
