41 Atg&Ctm Fope06

Prepared by Yagnesh Ponkia CES Inst

Tank Gauging & Tank Gauging & Custody Transfer Custody Transfer MeteringMetering

Presentation By Yagnesh Ponkia

CES Instrumentation

Reliance Industries Ltd


Tank Gauging SystemTank Gauging System

3 Prepared by Yagnesh Ponkia CES Inst

Types Of TanksTypes Of TanksTypes Of TanksTypes 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 TanksTypes Of TanksTypes Of TanksTypes Of Tanks

Open Floating

Roof Tank

Internal Floating

Roof Tank

Cone Roof

Dome Roof

Horizontal

Sphere


Types Of Tanks At JamnagarTypes Of Tanks At JamnagarTypes Of Tanks At JamnagarTypes 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 JamnagarTypes Of Tanks At JamnagarTypes Of Tanks At JamnagarTypes 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 / UllageLevel / UllageLevel / UllageLevel / Ullage

U llage

Innage

S afe F illing h ight

P roduct surface

D atum P la te


ATG ObjectiveATG Objective (1)(1)ATG ObjectiveATG Objective (1)(1)Raw parameter measurements in tank

LevelTemperatureHydrostatic PressureStatic PressureWater bottom


ATG Objective (2)ATG Objective (2)ATG Objective (2)ATG Objective (2)Calculated Tank Inventory

Gross volume @ amb.Net Volume @ amb.Net standard volume @ 15 deg C.MassUllage


Types of Tank gaugingTypes of Tank gaugingTypes of Tank gaugingTypes of Tank gauging Servo

Hydrostatic

Radar


Servo gaugesServo gaugesServo gaugesServo 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 gaugesHydrostatic tank gaugesHydrostatic tank gaugesHydrostatic tank gauges Hydrostatic pressure,

measured near the bottom of the tank.

Direct innage measurement

No standpipe requiredNo moving partsAccurate direct mass

measurement ( + 0.1%) Density = (P1 - P2) / H L = C + [ P1 / Density ]

c


Radar type level transmitterRadar type level transmitter.Radar type level transmitterRadar 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/2cWhere: 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 FMCWRadar - The Method FMCWRadar - The Method FMCWRadar - The Method FMCW


Radar – for Tank GaugingRadar – for Tank GaugingRadar – for Tank GaugingRadar – for Tank Gauging Refineries Independent tank

terminals Marketing terminals

Pipeline terminals Petrochemical

industry Liquefied gas

terminals Airports


Tank dippingTank dippingTank dippingTank 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 SystemReliance ATG System

Supplied by : M/S SAAB, Sweden.

Indian Representative : M/S Jost Eng. Pune.

Consultant : Bechtel Ltd.


SAAB - Pioneers in Radar Tank SAAB - Pioneers in Radar Tank GaugingGaugingSAAB - Pioneers in Radar Tank SAAB - Pioneers in Radar Tank GaugingGauging...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 BaseLarge Installed BaseLarge Installed BaseLarge Installed Base


Why Saab Was SelectedWhy Saab Was SelectedWhy Saab Was SelectedWhy 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 ComponentsSAAB System ComponentsSAAB System ComponentsSAAB 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 AccuracyRex, Custody Transfer AccuracyRex, Custody Transfer AccuracyRex, Custody Transfer Accuracy

1 LNE, France

2 PTB, Germany

3 NMi, Netherlands

4 OIML, International

5 TankRadar

API +- 1/8”

Saab TankRadar


Radar Tank GaugesRadar Tank GaugesRadar Tank GaugesRadar Tank Gauges


Horn Antenna Gauge – RTG 2920/3920Horn Antenna Gauge – RTG 2920/3920Horn Antenna Gauge – RTG 2920/3920Horn 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 2930/3930Parabolic Antenna Gauge – RTG 2930/3930Parabolic Antenna Gauge – RTG 2930/3930Parabolic 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 serviceReliable antennas for heavy duty serviceReliable antennas for heavy duty serviceReliable antennas for heavy duty serviceRough environments!

After four months in a Sulphur tank

Exposed to asphalt heated to 230°C


Still Pipe Gauge – RTG 2940/3950Still Pipe Gauge – RTG 2940/3950Still Pipe Gauge – RTG 2940/3950Still 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 Still pipe gauge – 3950 in Floating roof tanktankStill pipe gauge – 3950 in Floating roof Still pipe gauge – 3950 in Floating roof tanktank


LPG / LNG Gauge – RTG 2960/3960LPG / LNG Gauge – RTG 2960/3960LPG / LNG Gauge – RTG 2960/3960LPG / LNG Gauge – RTG 2960/3960 LPG and LNG Sphere and Bullet Tanks 150 – 600 PSI All serviceable parts

outside the tank


Power Supply to REXPower Supply to REXPower Supply to REXPower 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 OverviewREX INPUT's and OUTPUT's Overview


AccuracyAccuracyAccuracyAccuracy 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 configurationSAAB System configurationSAAB System configurationSAAB System configuration


Redundant SystemRedundant SystemRedundant SystemRedundant System


Emulation – Control Room ConnectivityEmulation – Control Room ConnectivityEmulation – Control Room ConnectivityEmulation – Control Room Connectivity


CalibrationCalibration GuidelinesGuidelinesCalibrationCalibration GuidelinesGuidelinesDo 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 Custody Transfer Metering SystemMetering System


PurposePurposePurposePurposeCTM 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 RequirementsCTM RequirementsCTM RequirementsCTM 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 CTMLocations of CTMLocations of CTMLocations of CTM

Plant1Company A

CTM Plant2Company B

CTM

CTM Gantry

Ship loading

Rail/Road loading


CTM RequirementsCTM RequirementsCTM RequirementsCTM 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 RequirementsCTM RequirementsCTM RequirementsCTM RequirementsA 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 MeasurementsCustody Transfer MeasurementsCustody Transfer MeasurementsCustody Transfer MeasurementsFollowing 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 meterTurbine meterTurbine meterTurbine meter More compact then

other meters.

Widely accepted for Custody transfer.

Greater maximum flow range for low viscous refined products.


Turbine meterTurbine meterTurbine meterTurbine meter Requires straight run

or straightening vanes.

Relatively high pressure drop / cavitations.


Positive Displacement metersPositive Displacement metersPositive Displacement metersPositive 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 metersPositive Displacement metersPositive Displacement metersPositive Displacement meters Very good Linearity.

No straight run or straightening vanes.

Good for heavy viscous products.

wheels


Ultrasonic Flow meterUltrasonic Flow meterUltrasonic Flow meterUltrasonic Flow meter Based on difference in

transit-time method.

New technology.

Viscosity independent.

No filter / strainers required.


Ultrasonic Flow meterUltrasonic Flow meterUltrasonic Flow meterUltrasonic Flow meter Requires straight run.

Large sizes available.

Suitable for Bi-directional flow.


Coriolis Mass Flow meterCoriolis Mass Flow meterCoriolis Mass Flow meterCoriolis Mass Flow meter Works on Newton’s

second low of motion. a = m / Fe

Measures mass, volume, density & temp. w/o secondary instrumentation.


Coriolis Mass Flow meterCoriolis Mass Flow meterCoriolis Mass Flow meterCoriolis Mass Flow meter High accuracy,

repeatability and turndown.

Limited to 6” meter size.

Sensitive to pipe geometry & vibration.


CTM System at RelianceCTM System at Reliance

Supplied by : M/S Smith Meters, USA.



Meter Run & SkidMeter Run & SkidMeter Run & SkidMeter 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



RP

L R

TF

RR

TF

MT

F

SP

M J

ET

TY

JK

PL

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.

RW611102

crude-30"

RW611103 FO-10"

MM812101

PX-16"MM812102

MM813109

MM813110

MM813108

MM813106

MM813105

MM813107

MM813101

PCN-24"MM813104

gaso-24"MM813102

kero-24"MM813113

hsd/sko-24"MM813112

disl-24"MM 813114

RS651080

6"

MethanolRW611104

10"

LPG

RS652100

RS651090

RS651085

RS652095

RS652090

RS652085

RS652080

RS652065

MM814101

NOTE:- Indicates Bidirectional Meter

Indicates Unidirectional Meter

Px-8"

MX.-6"

RS651095

RW631118

10"

AY231001

RIL

RPLHNHU & PLATFORMER

DATE:-08/09/97

MM813111

RW631117

PROPYLENE-8"

FISCAL METERING SKIDS

PLATFORMATE

RW611101 crude-30"


System ConfigurationSystem ConfigurationSystem ConfigurationSystem Configuration

M O D B U SIN T-30

SM ITH CONTROL PANEL

GEOPROV

FLOW COMPUTER(GEOflow)



PROVER INSTRUM ENTS

SKID M ETER RUN FIELD INSTRUM ENTS

TO OTHER PROVER COMPUTER W ITH INSAME PIB

FOX-IA DCS SYSTEM

PCC

PIB

FIELD

DCS - Custody Transfer Metering System Interface block diagram

AW -51 W P

M1 M2 M3

SKID-1SKID-2 SKID-n

RS 422 Redundant

GEOPROV GEOPROV

SupervisoryCom puter

SM IT H

SupervisoryCom puter

SM IT H


Design PhilosophyDesign PhilosophyDesign PhilosophyDesign 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 RelianceMetering skids with RelianceMetering skids with RelianceMetering 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 / RepeatabilityAccuracy / RepeatabilityAccuracy / RepeatabilityAccuracy / 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 Equipments Associated with a metering skidmetering skidEquipments Associated with a Equipments Associated with a metering skidmetering skidEach 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 SkidSmith CTM SkidSmith CTM SkidSmith CTM Skid


Equipments Associated with a Equipments Associated with a metering skidmetering skidEquipments Associated with a Equipments Associated with a metering skidmetering skidCommon 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 ComputersFlow ComputersFlow ComputersFlow 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 ComputersFlow ComputersFlow ComputersFlow 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 ComputersFlow ComputersFlow ComputersFlow ComputersSupervisory 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


ReferencesReferencesReferencesReferences 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 CalibrationCTM CalibrationCTM CalibrationCTM CalibrationIn-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 CalibrationCTM CalibrationCTM CalibrationCTM Calibration

Off-line calibration method

• Custody Transfer flow meter removal & calibration at FCRI.


Terminal Automation Terminal Automation System GantrySystem Gantry

Supplied by : M/S Hoffer



ComponentsComponentsComponentsComponents Batch Control Unit Filter/strainer with air eliminator Flow meter Digital set-stop valve Temperature Transmitter Over-fill switch Earthing Relay



Meter Factor ( MF )Meter Factor ( MF )Meter Factor ( MF )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 * C1 * C2 * C3 * C4 ]P

MF = --------------------------------

[ V * C1 * C2 * C3 * C4 ]M


CTM ProversCTM Provers


ProverProverProverProver 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 ProversReliance ProversReliance ProversReliance Provers Bi-Directional Conventional ( fixed volume)

prover

• Fixed

• Portable

Master Meter Proving

Tank Prover for Gantry meters


Tank ProverTank ProverTank ProverTank Prover


Bi-Directional Pipe ProverBi-Directional Pipe ProverBi-Directional Pipe ProverBi-Directional Pipe ProverPositive Displacement Bi-directional BAll Prover

Meter Under Test

4-WAy Valve

Detector # 1

Detector # 2

I nflatable Sphere

Pulse Counter


Bi-Directional Pipe ProverBi-Directional Pipe ProverBi-Directional Pipe ProverBi-Directional Pipe Prover


Bi-Directional Pipe ProverBi-Directional Pipe ProverBi-Directional Pipe ProverBi-Directional Pipe Prover


Prover SphereProver SphereProver SphereProver Sphere


Provers with RelianceProvers with RelianceProvers with RelianceProvers with RelianceFixed prover for Raw materials

Crude

IFO

Methanol

Portable ProverDiesel / kerosene

Naphtha / Gasoline

Aromatics

Aviation Turbine Fuel

LPG / Propylene


Master Meter ProverMaster Meter ProverMaster Meter ProverMaster 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 calibrationProver calibrationProver calibrationProver 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 certificationCustody Transfer Meter certificationCustody Transfer Meter certificationCustody 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.


CalibrationCalibrationCalibrationCalibration 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 CTMATG Vs CTMATG Vs CTMATG 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 PresentationEnd Of Presentation

Thanks for the listening ears.

Education

41 Atg&Ctm Fope06