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Pressure Control Philosophy
of Ammonia Storage Tank PIC-91124 S. Hasnain H. Zaidi Management Associate (Urea Operations)
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Table of contents FFBL Ammonia Storage facility- An Overview
Ammonia Storage Tank- An Introduction Causes of pressure deviation Pressure Control Loop- Schematic diagram and Description
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FFBL Ammonia Storage Facility
Introduction Mechanism
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Working mechanism of storage area
1st Stage Compressor 2nd Stage Compressor Condenser Flash Vessel Urea/ Dap Ammonia Storage Tank Incoming Ammonia from NH3 Plant
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Ammonia Storage Tank (AT-911) Introduction Assembly
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Double wall Ammonia Storage Tank AT-911
Loose Perlite 50mm Fiber glass Resilient blanket Outer tank 150mm Perlite on suspended deck Inner Tank Wooden Blocks Asphalt 102 mm Foam Glass 77 mm Sand Double wall Ammonia Storage Tank AT-911
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Pressure Control Philosophy
Why pressure of AT-911 carries such a high consideration?? Phase consideration Rapture Collapsing
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Causes of Pressure deviation
There are two ways to deviate the tank pressure At positive Pressure At negative pressure
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Storage Tank-Pressure Control Settings
0.100 Kg/cm2g PSV open Kg/cm2g Flare valve open Kg/cm2g Close flash drum outlet to tank Kg/cm2g High pressure alarm Kg/cm2g Start emergency compressor Kg/cm2g Start LAG compressor 0.004 Kg/cm2g Normal Tank Operating Pressure Kg/cm2g Stop emergency compressor Kg/cm2g Open recycle Valve Kg/cm2g Low pressure Alarm Kg/cm2g Open warm ammonia to tank Kg/cm2g Open Nitrogen make up valve Kg/cm2g Vacuum relief valve open
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In Case of DecreasingPressure In Case of Increasing Pressure
Normal Operating Pressure 0.04 Kg/cm2 g Emergency Compressor At Pressure Kg/cm2g Start Emergency Compressor At Pressure Kg/cm2g Stop Emergency Compressor At Pressure Kg/cm2g Stop LAG Compressor At Pressure Kg/cm2g Open Recycle Valve At Pressure Kg/cm2g PSV Open In Case of DecreasingPressure At Pressure Kg/cm2g Open Vent Valve In Case of Increasing Pressure At Pressure Kg/cm2g Open Nitrogen Make up Line At Pressure Kg/cm2g Vacuum Relief Valve Open At Pressure Kg/cm2g Start LAG Compressor PSV 1st Stage (LEAD) Compressor At Pressure Kg/cm2g High Pressure Alarm At Pressure Kg/cm2g Low Pressure Alarm At Pressure Kg/cm2g Open Warm Ammonia Valve Flare 1st Stage (LAG) Compressor At Pressure Kg/cm2g Stop Incoming Ammonia to Tank 2nd Stage Compressor Nitrogen Condenser Flash Vessel Stair Case Tower Warm NH3 Urea/ Dap Ammonia Storage Tank Incoming Ammonia from NH3 Plant
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questions are welcomed!!!
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