The document describes the decommissioning of a Horton sphere production facility. Key steps included emptying the sphere of ammonia and water, purging it with an inert gas, blinding open ends, draining water used to wash the ammonia-rich atmosphere, creating ventilation for inspection, dropping a level indicator for servicing, overhauling a refrigeration compressor, using a fire hydrant to wash out ammonia traces, arranging tankers for emergencies, testing connected lines for thickness and strength, removing and boxing insulation, arranging a hydrotest, replacing isolation and ESD valves, and isolating and purging ammonia submerged pumps for servicing.

1. HORTON SPHERE DECOMMISSIONING WITH
PRODUCTION FACILITY ONLINE

2. MANWAY COVER OPENED AFTER EMPTYING
AMMONIA, WATER WASH AND INERT GAS PURGING.

3. AMMONIA LIQUID OUTLET EXCESS FLOW VALVE

4. AMMONIA VAPOR OUTLET EXCESS FLOW VALVE

5. LIQUID AND VAPOR OPEN ENDS BLINDED

6. USAGE OF TANK FARM DYKE/ BUND AREA FOR DRAINING THE WATER FROM
HORTON SPHERE USED FOR WASHING OUT THE AMMONIA RICH ATMOSPHERE

10. AIR BLOWERS ARE ALIGNED IN ORDER TO CREATE PROPER VENTILATION FOR
INSPECTION RELATED ACTIVITIES

12. LEVEL FLOAT INDICATOR BEING DROPPED FOR SERVICING

13. OOPS…….

14. REFRIGERATION COMPRESSOR FOR HORTON SPHERE BEING OVERHAULED

15. FIRE HYDRANT HOSE PROVIDED FROM TOP TO WASH OUT TRACES OF AMMONIA

16. TANKER ARRANGEMENT FOR PLANT EMERGENCY IN CASE THE PRODUCT IS NOT
BEING UTILIZED

17. HORTON SPHERE CONNECTED LINES BEING TESTED FOR THICKNESS AND STRENGTH

19. PUF INSULATION REMOVAL/BOXING UP JOB

23. HYDROTEST ARRANGEMENT FOR HORTON SPHERE

24. ISOLATION VALVES & EMERGENCY SHUTDOWN VALVES REPLACED

26. AMMONIA SUBMERGED PUMPS ISOLATED AND PURGED FOR SERVICING