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41 Atg&Ctm Fope06

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    41 Atg&Ctm Fope06 41 Atg&Ctm Fope06 Presentation Transcript

    • Tank Gauging & Custody Transfer Metering Presentation By Yagnesh Ponkia CES Instrumentation Reliance Industries Ltd
    • Tank Gauging System
    • Types Of Tanks
      • Cone Roof Tank (With or W/O N2 purging)
      • Open Floating Roof Tank
      • Internal Floating Roof Tank. (With N2 Purging)
      • Dome Roof Tank
      • Sphere
      • Horizontal ( Bullet )
    • Types Of Tanks Open Floating Roof Tank Internal Floating Roof Tank Cone Roof Dome Roof Horizontal Sphere
    • Types Of Tanks At Jamnagar
      • Internal Floating roof (for high vapour pressure) with N2 blanket (for toxic & flammable liquid) – for custody transfer - 1C
      • Internal Floating roof with N2 blanket (For Toxic & flammable liquid) – Not for Custody transfer - 1N
      • Cone roof (Atmospheric pressure ) with N2 blanket - for custody transfer - 2C
      • Cone roof with N2 blanket – Not for custody transfer - 2N
    • Types Of Tanks At Jamnagar
      • Cone roof Custody transfer - 3C
      • Cone roof not for Custody transfer - 3N
      • Open Floating roof for custody transfer -4C
      • Open Floating roof not for custody transfer -4N
      • Sphere - SC
    • Level / Ullage
    • ATG Objective (1)
        • Raw parameter measurements in tank
          • Level
          • Temperature
          • Hydrostatic Pressure
          • Static Pressure
          • Water bottom
    • ATG Objective (2)
        • Calculated Tank Inventory
          • Gross volume @ amb.
          • Net Volume @ amb.
          • Net standard volume @ 15 deg C.
          • Mass
          • Ullage
    • Types of Tank gauging
      • Servo
      • Hydrostatic
      • Radar
    • Servo gauges
      • Static force transducer, which continuously measures the weight of the displacer, controlling the position of a grooved drum
      • Density and interface measurement (for clean products only)
      • Specialized maintenance required.
    • Hydrostatic tank gauges
      • Hydrostatic pressure, measured near the bottom of the tank.
          • Direct innage measurement
          • No standpipe required
          • No moving parts
          • Accurate direct mass measurement ( + 0.1%)
      • Density = (P1 - P2) / H
      • L = C + [ P1 / Density ]
      c
    • Radar type level transmitter .
      • The time delay between a transmitted and reflected microwave signal is used to measure the distance between the gauge and the liquid surface.
      • D = t/2c
      • Where: t = time of flight & c = speed of light (c = 186,000 miles/sec )
      • No moving parts
      • No contact with the liquid
      • High level accuracy of +/- 1 mm
    • Radar - The Method FMCW
    • Radar – for Tank Gauging
      • Refineries
      • Independent tank terminals
      • Marketing terminals
      • Pipeline terminals
      • Petrochemical industry
      • Liquefied gas terminals
      • Airports
    • Tank dipping
      • It is performed by lowering a tape covered with paste through the dip pipe of the tank and determining the ullage on basis of the location of the colour change of the paste.
      • Accuracy at best +/- 2 mm which is twice as inaccurate as the other tank gauging methods.
    • Reliance ATG System Supplied by : M/S SAAB, Sweden. Indian Representative : M/S Jost Eng. Pune. Consultant : Bechtel Ltd.
    • SAAB - Pioneers in Radar Tank Gauging
      • ...Saab Rosemount
      • 30 years experience in Radar Level Gauging
      • Radar for every tank and product
      • Largest number of accuracy approvals
      • Largest installed base of Radar Tank Gauges
    • Large Installed Base
    • Why Saab Was Selected
      • No Moving Part
      • Proven Radar Technique-can Be Used For White & Black Oils With Different Gauge Head.
      • Meeting Custody Transfer Requirements
      • Proven For Interfacing With Foxboro.
    • SAAB System Components
      • Radar Level Gauge
      • Multi Spot Temperature Probe
      • Single Spot Temperature Probe
      • Bottom Water Level Probe
      • Vapour/N2 Pressure Transmitter
      • Hydrostatic Pressure Transmitter
      • Data Acquisition Unit
      • Independent Display Unit
      • Field Communication Unit
      • Field Bus Modem
      • OPI Station - HMI
    • Rex, Custody Transfer Accuracy 1 LNE, France 2 PTB, Germany 3 NMi, Netherlands 4 OIML, International 5 TankRadar API +- 1/8” Saab TankRadar 
    • Radar Tank Gauges
    • Horn Antenna Gauge – RTG 2920/3920
      • Fixed roof tanks
      • Clean products
      • Small tank nozzles,
      • 8” or larger
      • Easy installation on
      • tanks in operation
      • No maintenance
    • Parabolic Antenna Gauge – RTG 2930/3930
      • Excellent for heavy products
      • Fixed roof tanks
      • All types of products
      • Custody transfer accuracy
      • Close to the tank wall
      • No maintenance
    • Reliable antennas for heavy duty service
      • Rough environments!
      After four months in a Sulphur tank Exposed to asphalt heated to 230°C
    • Still Pipe Gauge – RTG 2940/3950
      • Floating roof tanks
      • External / Internal floaters
      • Installed on existing still pipe
      • Unaffected by rust and
      • deposits on the still pipe
      • 5”, 6”, 8”, 10” & 12” pipes
    • Still pipe gauge – 3950 in Floating roof tank
    • LPG / LNG Gauge – RTG 2960/3960
      • LPG and LNG
      • Sphere and Bullet Tanks
      • 150 – 600 PSI
      • All serviceable parts
      • outside the tank
    • Power Supply to REX
      • 100 - 240 VAC
      • Low voltage version:
      • 34 - 70 AC
      • 48 - 100 VDC
      • Easy start up
      • Easy commissioning
      • Easy to connect to existing systems
    • REX INPUT's and OUTPUT's Overview
    • Accuracy
      • Level :- +/- 1 mm
      • Bottom Water Level :- +/- 3 % Of Full Range.
      • Temperature :- +/- 0.1 Deg C
      • Hydrostatic Pressure:- +/- 0.1 % Of Full Scale
      • Static Pressure:- +/- 0.1 % Of Full Scale
    • SAAB System configuration
    • Redundant System
    • Emulation – Control Room Connectivity
    • Calibration Guidelines
      • Do not calibrate when
      • The tank is emptying or filling
      • Agitators are running.
      • When there is windy condition.
      • When there is foam on the surface.
    • Custody Transfer Metering System
    • Purpose
      • CTM system can be used for
        • Receipt of Raw materials
        • Sale of products / by-products to external customers
        • Transfer between legal entities within the complex
        • Metering for customs & excise payments
    • CTM Requirements
      • This metering metering should be acceptable to
      • --W&M authority of the country
      • --And product buyer / Seller
      • Flow metering shall be done as per acceptable international standards e.g., API manual of Petroleum measurement standards
    • Locations of CTM Plant1 Company A CTM Plant2 Company B CTM CTM Gantry Ship loading Rail/Road loading
    • CTM Requirements
      • Provision for inline validation/proving of the flow meters
      • Verification of the complete system against standard instead of electronics/sensor calibration only as in case of ordinary flow meters.
    • CTM Requirements
      • A reliable flow measurement system should consist of
      • Accurate flow meters with pressure, temperature and density compensation
      • Tantalization of the flow over a period of time/in a batch - gross volume, gross standard volume, gross mass
    • Custody Transfer Measurements
      • Following type of flow meters/systems have been accepted as suitable for custody transfer metering by the oil & gas industry based on their performance, accuracy, repeatability and reliability:
      • (1)    Mass Flow meters
      • (2)    Turbine Meters
      • (3)    Positive Displacement Meters
      • (4)    Ultrasonic Meters
      • (5)    Automatic Tank Gauging
    • Turbine meter
      • More compact then other meters.
      • Widely accepted for Custody transfer.
      • Greater maximum flow range for low viscous refined products.
    • Turbine meter
      • Requires straight run or straightening vanes.
      • Relatively high pressure drop / cavitations.
    • Positive Displacement meters
      • measures the flow of the fluid directly.
      • It sweeps out a known volume every cycle and therefore the flow is this volume multiplied by the cycles per second.
      wheels
    • Positive Displacement meters
      • Very good Linearity.
      • No straight run or straightening vanes.
      • Good for heavy viscous products.
      wheels
    • Ultrasonic Flow meter
      • Based on difference in transit-time method.
      • New technology.
      • Viscosity independent.
      • No filter / strainers required.
    • Ultrasonic Flow meter
      • Requires straight run.
      • Large sizes available.
      • Suitable for Bi-directional flow.
    • Coriolis Mass Flow meter
      • Works on Newton’s second low of motion. a = m / F e
      • Measures mass, volume, density & temp. w/o secondary instrumentation.
    • Coriolis Mass Flow meter
      • High accuracy, repeatability and turndown.
      • Limited to 6” meter size.
      • Sensitive to pipe geometry & vibration.
    • CTM System at Reliance Supplied by : M/S Smith Meters, USA. Consultant : Bechtel Ltd.
    • Meter Run & Skid
      • At Reliance, 32 no of Metering Skid located in four different areas.
      • Meter Run
      • A Pipe line consisting of custody meter & its associated equipments.
      • Metering Skid
      • Group of meter runs called metering skid.
      • One skid can have up to six meter runs
    •  
    • RPL RTF RRTF MTF SPM JETTY JKPL p.c.nap.-14" p.c.naptha 18" 10" A.R.Napt. URG-10" 14" URG 12" RFG Bz-8" OX-8" 10" PX-6" PX 8" LAB k 14" sko-8" sko HSD-16" 12" ATF-8" ATF 12" LPG 24" Dis. RW 611 102 crude-30" RW 611 103 FO-10" MM 812 101 PX-16" MM 812 102 MM 813 109 MM 813 110 MM 813 108 MM 813 106 MM 813 105 MM 813 107 MM 813 101 PCN-24" MM 813 104 gaso-24" MM 813 102 kero-24" MM 813 113 hsd/sko-24" MM 813 112 disl-24" MM 813 114 RS 651 080 6" Methanol RW 611 104 10" LPG RS 652 100 RS 651 090 RS 651 085 RS 652 095 RS 652 090 RS 652 085 RS 652 080 RS 652 065 MM 814 101 NOTE:- Indicates Bidirectional Meter Indicates Unidirectional Meter Px-8" MX.-6" RS 651 095 RW 631 118 10" AY 231 001 RIL RPL HNHU & PLATFORMER DATE:-08/09/97 MM 813 111 RW 631 117 PROPYLENE-8" FISCAL METERING SKIDS PLATFORMATE RW 611 101 crude-30"
    • System Configuration
    • Design Philosophy
      • No bypass arrangement of Skid.
      • N+1 meter run for stand-by & master meter.
      • Individual Flow computer / meter run.
      • Individual Prover computer / Skid
      • Redundant Supervisory computer / PIB.
      • Online density measurement
    • Metering skids with Reliance
        • Two Meter run with Portable prover
        • Two Meter run with Fixed Prover
        • Three meter run with Portable prover.
        • Three Meter run with Fixed Prover
    • Accuracy / Repeatability
        • Over all Skid
            • Accuracy: +/- 0.25 %
            • Repeatability : +/- 0.02 %
        • Turbine Meter
            • Accuracy: +/- 0.15 %
            • Repeatability : +/- 0.02 %
        • Density Meter
            • Accuracy : 0.0001 g/cc
        • Fixed volume prover
            • Accuracy: +/- 0.02 %
    • Equipments Associated with a metering skid
      • Each meter run consists of
      • Flow computer
      • Strainer
      • Flow straightener
      • Turbine flow meter
      • Flow control valve
      • Pressure Transmitter/Gauge
      • Temperature Transmitter/Gauge
      • O/L MOV, Prover I/L MOV
      • Air eliminator
    •  
    • Smith CTM Skid
    • Equipments Associated with a metering skid
      • Common equipments for each skid
      • Density Meter with pump for constant flow/pressure
      • Prover Computer
      • Sets of metering skids are monitored/ controlled by
      • Redundant Supervisory Computers
    • Flow Computers
      • GEOFLOW
        • All process parameters related to a meter run are routed to Flow computer
        • Calculates gross & net volumes
        • Calculate Mass flow
        • Alarm indication
        • Link to prover computer
    • Flow Computers
      • GEOPROV
        • Performs proving & Calculates meter factor
        • Alarm indication
        • MOV control
        • Communication with Supervisory computer
        • All flow computers for a metering skid communicate to prover computer
        • All process parameters related to prover are routed to prover computer
    • Flow Computers
      • Supervisory Computer
        • Rate control at start-up, shutdown & during loading
        • Flow balancing of multiple meter runs
        • Reports
        • Diagnostics
        • RS-485/422 link to DCS / OMIS
        • Continuous updating of offline computer
    • References
      • As per Bechtel Specification
      • Confirm to
        • API - Ch.5/Sec.5.3 - for “ Metering of liquid hydrocarbons by turbine meters
        • API - Ch.4 for “ Proving system”
    • CTM Calibration
      • In-line calibration method
      • In-line calibration method is usually applied for the calibration of custody transfer meters without disturbing the product flow to/from units, buyer/seller
      • Calibration shall be done at the conditions same as at the time of product flow i.e., same temperature/ pressure/density/flow rate
    • CTM Calibration
      • Off-line calibration method
      • Custody Transfer flow meter removal & calibration at FCRI.
    • Terminal Automation System Gantry Supplied by : M/S Hoffer Consultant : Bechtel Ltd.
    • Components
      • Batch Control Unit
      • Filter/strainer with air eliminator
      • Flow meter
      • Digital set-stop valve
      • Temperature Transmitter
      • Over-fill switch
      • Earthing Relay
    •  
    • Meter Factor ( MF )
      • Reference API Chapter 12.2
      • Meter calibrated against a reference called Prover
      • MF ratio of Prover to Metered volume
      • Metered volumes compensated or corrected for pressures and temperatures on steel ( 1,3 ) and liquid ( 2,4 )
      • MF may be re defined as follows:
      • [ V * C 1 * C 2 * C 3 * C 4 ] P
          • MF = --------------------------------
          • [ V * C 1 * C 2 * C 3 * C 4 ] M
    • CTM Provers
    • Prover
      • It is an equipment used for complete calibration of Custody transfer meter runs.
      • Types of Prover
        • Tank Prover
        • Pipe Prover
        • Master Meter
        • Small Volume Prover ( SVP )
    • Reliance Provers
      • Bi-Directional Conventional ( fixed volume) prover
          • Fixed
          • Portable
      • Master Meter Proving
      • Tank Prover for Gantry meters
    • Tank Prover
    • Bi-Directional Pipe Prover
    • Bi-Directional Pipe Prover
    • Bi-Directional Pipe Prover
    • Prover Sphere
    • Provers with Reliance
      • Fixed prover for Raw materials
      • Crude
      • IFO
      • Methanol
      • Portable Prover
          • Diesel / kerosene
          • Naphtha / Gasoline
          • Aromatics
          • Aviation Turbine Fuel
          • LPG / Propylene
    • Master Meter Prover
      • Reference API Chapter 4.5
      • Indirect method of proving
      • Any existing meter with same or better accuracy, can be used as a master meter and dedicated to proving service only – used infrequently resulting in less wear & tear
      • Operates in series with custody meter and shall give gross volumes without corrections
      • A minimum of two minutes flow and 10,000 pulse output from meter is desired
    •  
    • Prover calibration
      • Proving Of Prover
        • W & M Approved Third party
        • Once in 3 years for portable provers and once in 5 years for fixed provers
        • Reliance proved its provers in Jan 2005 by Shell Global Solutions, Malaysia.
    • Custody Transfer Meter certification
      • Approval required for each meter run once in a year
      • W&M Inspector visit the site, check the calibration & stamp on the flow meter.
    • Calibration
      • Vendor’s master prover is proved by water draw method
      • Vendor’s master meter is proved against master prover at site
      • Client’s prover is proved against vendor’s master meter
      Water Draw Vendor Prover Vendor MM Client’s Prover Client’s MM Client’s Meter Once a year Frequently at Client’s site Once in 3/5 years Once in year Based on site experience
    • ATG Vs CTM
      • When factors, such as capital costs and operating expenses, are weighed, tank gauging may be a better choice for large displacements as the errors are within the limitations.
      • However for small displacements Custody flow metering with compensation is better solution.
    • End Of Presentation Thanks for the listening ears.