Document aB5GnopVobvvXY85dgn8p713N

POWER II SAFE WORK PROCEDURE NORMAL FREEZE PRECAUTIONS Anytime the weather forecast indicates expected temperatures be 32F 26F,tween and the following precautions should be imple mented: _____ 1. _____ 2. _____ 3. _____ 4, _____ 5. _____ 6. _____ 7. _____ 8. _____ 9. _____ 10. Turn on steam tracings. Check each for adequate flow. (a) South side HRU-1 (b) South side HRU-2 (c) Two C/Runder piperack outside building (one near NE CORNER OF BUILDING.. ONE AT POTABLE WATER TRANS MITTER). Establish some flow through several faucets or other POTABLE WATER OUTLETS IN CONTROL-OFFICE BUILDING. Block off and drain condensate tubing line to battery- room. Insure adequate flow through sample line to condensate conductivity cell. Establish some flow through 3/8" tubing lines from process water dead-ends (near each Spray-Water con trol station). Block in and drain condensate lines to Spray-Water con trollers. Establish some flow through process water service lines HRU'on both sides and top of s and south of each Combus tor. Establish some flow through hose connections on conden sate LINES TO CHEMICAL MIX TANKS. Close block valves on cooling water supply and return LINES (OVERHEAD NEAR SW CONRNER OF EACH HRU)-DRAIN SECTIONS OF LINES OVERHEAD IN NORTH-SOUTH PIPE RACK, Establish flow through process water service lines east C.T.of each Generator and one near pumps, DO 124793 CONFIDENTIAL POWER II SAFE WORK PROCEDURE -2- FREEZE PRECAUTIONS _____11. _____12. ____ 13. ,m_____ _____15. _____16. _____17. _____18. ___ _19. _____20. _____21. Establish flow through drains on both sprinkler SYSTEMS. Establish flow through hose connections on deluge guns (5). Establish some flow through hose connection near ARU FLASH-TANK LEVEL CONTROLLER. Establish some flow through service hose on north SIDE C.T, STAIRS. Establish flow through drains (A) on potable water MAKE-UP LINE. Establish flow through 3/8" tubing from potable water pump discharge line to top of storage tank. Block off and drain cooling water flush line to caustic PUMPS. Insure caustic tank heaters are on and functioning. Crack drain valves on air receiver and cooler. Block off process water line to Warehouse and establish some flow through drain on upstream side. Drain ser vice HOSE CONNECTIONS. Establish some flow through faucets in Warehouse rest rooms. HARD FREEZE PRECAUTIONS The following items will apply when temperatures are forecast 26Fbelow or for those periods when temperatures are expected TO REMAIN BELOW FREEZING FOR OVER 12 HOURS.' _____ 1, ___ 2. ___ 3. AWC' .Establish flow through condensate make-up lines to s AWCEstablish flow through drains on recirculation pumps. AWCClose suction valves to return pumps and open drains before each pump. DO 124794 CONFIDENTIAL POWER II SAFE WORK PROCEDURE -3- FREEZE PRECAUTIONS . A, . 5. . 6. . 7. ARU' .Drain chilled water lines to and from s ARUClose suction valves to condensate pumps, remove PLUGS AND DRAIN PUMPS. Close main block valve on process service water line to Block (near NE corner of AWC-1A). Drain all lines. Alternate the following pumps (every A hours): (a) C.T. Pumps (b) H.P.-BF Pumps (c) L.P.-BF Pumps . 8. Run sand-filter pump; insure adequate flow to filter, . 9. Maintain small amount of flow through Cation line. 10. When necessary to cool Cooling Tower water, run south pump with full flow through 200 ARU's. 3/4"Insure that drains to basin from return lines are open. 4/18/80 :Jml 00 124795 CHFlDf~NTTAi