Interlock process

Thread Content

I. Main interlock UZ02101 1. Factors that cause the activation of the main interlock UZ02101 are: ① Two of the liquid levels in the air-cooling towers, LSHH01101A/B/C, reach the interlock value (2300 mm). ②The air-cooled tower outlet pressure PSLL01102A/B/C has two interlock setpoints (4.5 bar), which are activated when reached (HS02101 is engaged). ③When the pressure difference across the molecular sieve inlet and outlet, PDSHH01205A/B/C, reaches two times the interlock value (0.15 bar), (HS02101 is activated). ④The air release valve HV02001 of the raw material air compressor is fully open. ⑤Pressure booster failure. ⑥Failure of the raw material air compressor. ⑦Turbine failure. 2. The results of the main interlock UZ01201 activation are: ①HV02001 fully open, FV02001 fully open, FV02002 fully open, FV02003 fully open, PV02001 fully closed. ②Stop the expander, open FV01312, and close HV01310. ③Shut down the normal-temperature water pumps 01P101A/B, and shut down the chilled-water pumps 01P102A/B (Note: When the liquid level L01103 in the water cooling tower reaches the interlock level of 100 mm, P01102A/B will also be shut down). ④ Shut off HV01421, TD01422, TD01423, TD01424, HV01425, and HV01426 completely. ⑤HV01401 fully closed. ⑥Full shutdown of HV01507 and interlock activation of UZ01412. ⑦Full shutdown of HV01508 and interlock activation of UZ01413. ⑧FV01605A and LV01608 are fully turned off. ⑨Liquid argon pumps 01601A/B are stopped, while liquid oxygen pumps 01P501A/B and liquid nitrogen pumps 01P502A/B operate at idle speed. II. UZ01302 Interlock 1. Reasons for the activation of the UZ01302 interlock: ① Expander operation signal SOS01301 (with a 30-second delay). ②Expander failure. 2. The results of the UZ01302 interlock action are: ①HV01421, TD01422, TD01423, TD01424, HV01425, and HV01426 all shut off. ②HV01401 fully closed. ③Full shutdown of HV01507 and interlock action of UZ01412. ④Full shutdown of HV01508 and interlock action of UZ01413; ⑤ Full shutdown of FV01605A and LV01608. ⑥Liquid-stop argon pump 01P601A/B. III. When both refrigeration water pumps 01P102A/B generate shutdown signals SOS01103 and SOS01104, or when one pump stops operating while the other continues to run and a shutdown signal is generated, FV01101 shall be fully closed and UV01103 shall be fully opened. IV. When both normal-temperature water pumps 01P101A/B simultaneously generate shutdown signals SOS01101 and SOS01102, or when one pump stops operating while the other continues to run and a shutdown signal is generated, FV01102 shall be fully closed. V. When the ammonia evaporator reaches TSLL01106 (5°C) or LSHH01105 (either interlock value), LV01105 shall be fully closed. VI. When the liquid oxygen concentration analyzed by ASLL01412 reaches the interlock value (99.5%), HV01507 is fully closed and UZ01412 triggers an interlock action. VII. When the oxygen concentration analysis ASHH01413 of liquid nitrogen reaches the interlock value (20 PPm), HV01508 is fully closed and UZ01413 triggers an interlock action. VIII. When the oxygen content in the crude argon fed to the crude argon liquefier, as measured by ASHH01604, reaches the interlock value of 5 PPm, FV01605A and LV01608 are closed completely. IX. The factors that caused the shutdown of liquid oxygen pump 01P501A and the activation of the UZ01505A interlock are as follows: 1. When the pressure difference between the pump’s inlet and outlet, PDALL01503A, reaches 30 bar. 2. Pump seal pressure difference PDSLL01504A (0.00 bar). 3. Temperature at the labyrinth seal TSLL01522A (–120°C). 4. The temperature at the bearing heating area, TSHH01521A (115°C). Ten, the consequences of the shutdown of the liquid oxygen pump 01P501B and the activation of the UZ01505B interlock are as follows: 1. When the pressure difference between the pump’s inlet and outlet, PDALL01503B, is 30 bar. 2. Pump seal pressure difference PDSLL01504B (0.00 bar). 3. Temperature at the labyrinth seal TSLL01522B (‑120°C). 4. Temperature at the bearing heating point TSHH01521B (115°C). XI. The factors that led to the shutdown of the liquid nitrogen pump 01P502A and the activation of the UZ01506A interlock are as follows: 1. When the pressure difference between the pump’s inlet and outlet, PDALL01505A, reaches 50 bar. 2. Pump seal pressure difference PDSLL01506A (0.00 bar). 3. Temperature at the labyrinth seal TSLL01525A (–120°C). 4. Temperature at the bearing heating point TSHH01524A (115°C). XII. The factors that led to the shutdown of the liquid nitrogen pump 01P502B and the activation of the UZ01506B interlock are as follows: 1. When the pressure difference between the pump’s inlet and outlet, PDALL01505B, reaches 50 bar. 2. Pump seal pressure difference PDSLL01506B (0.00 bar). 3. Temperature at the labyrinth seal TSLL01525B: –120°C. 4. Temperature at the bearing heating point TSHH01524B (115°C). 13. The interlocks that cause the liquid argon pumps 01P601A/B to stop operating are: 1. Pump seal pressure difference PDSLL01608A/B (0.00 bar). 2. Temperature at the labyrinth seal TSLL01604A/B (–120°C). 3. Temperature at the bearing heating area TSHH01603A/B (115°C). 4. Liquid level in the lower column of Argon Tower II, LSLL01602 (300 mm). 14. When both pumps 01P501A/B emit fault or shutdown signals, HV01504 shall be fully closed. 15. When both pumps 01P502A/B emit fault or shutdown signals, HV01506 shall be fully closed. 16. When the pressure at the outlet of the crude argon condenser, PSLL01601 (0.089 bar), triggers an interlock, FV01605B shall be fully closed. 17. When the pressure PSLL01604 (0.09 bar) of the refined argon tower triggers interlock, HV01630 shall be fully closed. 18. When either TSLL01711 (10°C) or PSHH01703 (165 bar) reaches the interlock value, the liquid oxygen pump 01P701 stops. 19. When either TSLL01815 (0°C) or PSHH01817 (165 bar) reaches the interlock value, the liquid nitrogen pump 01P815 stops. 20. When either PDSLL01821 (50 bar) (with a 30-second delay), PDSLL01801, TSLL01822, TSHH01821, TICS01801 at -10°C, or TIS01802 at 30°C reaches the interlock value, the liquid nitrogen pump 01P801 will stop. 21. When either TSLL01901 (5°C) or PSHH01981 (175 bar) reaches the interlock value, the liquid argon pump 01P981 stops. 22. UZ01412 interlock result: HV01411 fully closed, FV01412 fully open. 23. Result of UZ01413 interlock action: ① PV01414, HV01429, HV01431, HV01432, HV01433, and HV0150 are all turned off. ②FV01414, UV01434, and FV01430 are all turned on. 24. When the UZ01505A interlock activates, the result is: ①01P501B increases from its idle speed to its normal speed. ②PV01505A is fully open. 25. When the UZ01505B interlock activates, the result is: ①01P501A increases from its idle speed to its normal speed. ②PV01505B is fully open. 26. When the UZ01506A interlock activates, the result is: ①01P502B increases from its idle speed to its normal speed. ②PV01506A is fully open. 27. When the UZ01506B interlock activates, the result is: ①01P502A increases from its idle speed to its normal speed. ②PV01506B is fully open.