Document 82aQL5xqjgp8YdznMZkpo07pa

CHLOR - ALKALI 2 1994 REACTIVE CHEMICALS REVIEW POWER AREA A 04604^ ^ONFTDFNTTai 09/M POWER AREA Ambient Air Sulfuric Acid 2 Gas Betz 38K Betz Antifoam CTW Return Process Water CTW To Plant DOW CONFIDENTIAL Regal 32 Lube Oil DO A 046044 CONFIDENT T Al. POWER & UTILITIES CHEMICALS AND RAW MATERIALS CHEMICALS: Lube & Seal Oil "Regal 32" Detergent Sulfuric Acid Anti-foam Betz 6409B Betz 38K RAW MATERIALS: Chlorine Gas Hydrogen Gas Methane Water A) Condensate B) Process Water C) Steam 600/235 / 115 / 30 PSIG Dow Confidential 00 A 046045 OONF T DFNT T At 09/28/94 POWER & UTILITIES POTENTIAL PROBLEMS PREVENTIVE MEASURES POSSIBLE EXPLOSION/FIRE DUE TO METHANE - OXYGEN MIXTURE IN PIPE OR VESSEL POSSIBLE EXPLOSION/FIRE DUE TO METHANE - OXYGEN MIXTURE IN GAS TURBINE DURING STARTUP OR SHUTDOWN POSSIBLE EXPLOSION/FIRE DUE TO HYDROGEN - OXYGEN MIXTURE IN FILL SYSTEM AND COOLING SYSTEM FOR GENERATORS POSSIBLE EXPLOSION/FIRE DUE TO HYDROGEN FROM SEAL OIL SYSTEM ENTERING INTO LUBE OIL SUMP I * Established procedures on purging fuel gas lines with nitrogen before taking out of service or returning to fuel gas service. 1 - Double block & bleed system integrated with startup and shutdown sequence. 2 - Compressor discharge press switch to insure adequate air supply before injecting fuel gas. 3 - Flame monitors to detect presence of flame in combustion section. Trips unit if flame not detected. 4 - Manual Air solenoid with time out function to enable fuel gas valves only during startup operation. 1 - Procedure for connecting/disconnecting hydrogen trailers from Air Products. 2 - Sampling procedure to verify H2 purity. 3 - Purge procedures for pressuring/depressuring generators. 1 - Seal oil system is backed up by the gas turbine oil pumps. 2 - Hydrogen vapor extractor removes H2 gas before oil reaches lube oil sump. System is protected by a dip leg to prevent gas from entering sump. 3 - Lube oil reservoir has a blower to remove hydrogen gas/oil vapor from sump. Dow Confidential DO A 046046 C.ONF IDFNT T A! 09/27/94 POWER & UTILITIES POTENTIAL PROBLEMS PREVENTIVE MEASURES FIRE INSIDE LINES CAUSED BY RESTRICTION OF AIR FLOW DUE TO OIL IN COOLING AIR SYSTEM 1 - Seal air system has low pressure alarm to prevent oil leakage. 2 - Cooling air flow indication with high/low temperature alarms. 3 - Auto swap on plant air to seals for startup and shutdown. Dow Confidential 00 A 046047 OONFTDFNTTAl 09/27/94 POWER AREA CRITICAL INSTRUMENTS Compressor discharge pressure transmitter - Initiates ignition at pressures greater than 18" water. Over-speed trip diaphragm pressure switch monitors position of over-speed trip valve and is a permissive for the fuel gas over-speed trip valve. Trip is set at 35 psi. High fuel gas pressure transmitter will trip turbine at 215 psi, provided 100 % speed has not been reached. Low fuel gas pressure transmitter will trip turbine at 110 psi, provided the operator selector switch is not in SPIN position. Starting valve reset is a permissive for the turbine ignition sequence. High turbine exhaust blade bath temperature transmitters trip turbine at 1010 F. Both transmitters must be greater than setpoint to trip turbine. High turbine exhaust blade manifold temperature transmitters trip turbine at 1010 F. Both transmitters must be greater than setpoint to trip turbine. High disc cavity temperature transmitters trip generator at 550 F for first set and 800 F for remaining sets. It takes both transmitters in each set to trip the generator. Dow Confidential DO A 046048 OONFTDFNTIAl 09/27/94