model 2700 with api

8/3/2019 Model 2700 With API

1/19

Model 2700 Transmitter

with Petroleum Software Option


2/19

Digital Signal Processing with MVD

T

Analog, limited sampling

DSP, higher resolution

Faster sampling

Higher frequency drive

10 times less sensitive tosignal noise

Enhanced patented algorithms

Digital circuitry

Faster Response

Better Repeatability

Less Parts More Reliable


3/19

MVD Petroleum Software

The petroleum software version adds the followingcalculations to the standard 2700 software:

Calculates base density and Ctl (the correction for the effect oftemperature on a liquid)

Calculates gross volume at standard temperature

Calculates flow weighted average temperature and averageobserved gravity (flowing density)

In order to meet the 0.5F accuracy in temperaturemeasurement as required per API MPMS Chapter 7, anexternal RTD must be utilized.

The core processor must be mounted remote from the sensor inorder to bring in the signal to the core processor from thisexternal RTD.


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Calculation of Base Density

The software utilizes API MPMS Chapter 11.1 tocalculate the base density from the flowingdensity and the flowing temperature.

Base density can be calculated in degrees API at

60F, SGU at 60 F, or kg/cm3 at any referencetemperature.

The fluid being measured dictates the appropriateequation for the calculation of base density.

Base density and flowing density are bothavailable as outputs from the 2700.


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API Chapter 11.1 consists of computerprocedures, however, tables were computed forreference.

Table A Generalized Crude Oil

Table B Generalized Products Table C for Individual and Special Applications

Table D for Lubricating Oils

API in Tables 5 and 6

Relative Density (SGU) in Tables 23 and 24

Kg/m3 in Tables 53 and 54


6/19

API Measurements


7/19

API MPMS Chapter 11.1 Tables 5A, 53A, and23A covering generalized crude oil and JP4.

Table 5A, used for a base temperature of 60F,covers and API@60F range of 0 to 100 API.

Table 53A, used for a base temperature of 15Ccovers a base density range of 610 to 1075 kg/m3.(Other base temperatures can be used.)

Table 23A, used for a base temperature of 60F,

covers a relative density@ 60F range of 0.6110 to1.0760 SGU.



8/19

Limitations on API Chapter 11.1

The calculations are limited to the following: Crude oil from 0 to 100 API (0.611 to 1.076 g/cc)

Generalized products from 0 to 84 API (0.657 to 1.076g/cc)

Temperatures from 0 to 300 F

The 2700 will show an alarm if the density ortemperature goes outside the ranges of the table,

however, it will continue to calculate.

Note: Core rev 2.2 or higher allows ranges outside the tables


9/19

Generalized Products

The tables identified for generalized productscover refined products such as

Gasolines

Naptha

Jet fuels, kerosene and Stoddard solvents

Diesel oil, fuel oil and heating oil


10/19

Fluids not covered by Chapter 11.1 Propane and propane mixes

Butane and butane Mixes

Isopentane

Butadiene and butadiene mixes

LPG , LNG and NGL

Ethylene and Propylene

Cyclohexane and aeromatics

Asphalts and road tars

Many of these fluids are metered on a mass basis thus eliminating theneed for the calculation of base density.


11/19

MVD Petroleum Software

API and SGU are calculated as follows:

SGU = kg/m3 at 60 F / 999.012 (density of water at 60F)

API = (141.5 / SGU) - 131.5

The industry utilizes API and SGU as units for both

flowing density (sometimes referred to as observedgravity) and base density (sometimes referred to ascorrected gravity).

Therefore, the software allows the use of API and SGU forflowing density. Flowing density in SGU = kg/m3 / 999.012.


12/19

12

API configuration screen using ProLink II


13/19

External RTD Configuration using ProLink II


14/19

Flow Weighted Averages

Computations for average temperature and averagedensity (observed gravity)

Average values are based on one temperature and one densitysample per unit of flow measurement. That is, each time a singleunit of flow (barrel or whatever the user has selected) has beentotaled, a sample of the current temperature and observedgravity is noted- the flow weighted average is the average of allthe samples.

The weighted average for temperature and the weighted averagefor density are reset with the resetable totals. The reset functionis available through the display with password security protection

and through Prolink/HART.


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Compressibility

The MVD Petroleum software does not utilizeChapter 11.2 to calculate Cpl (the effect ofpressure on the density or the volume of thefluid.)

Therefore, the volume calculation is not net volume.

The volume calculated is defined as gross volume atstandard temperature.


16/19

Coriolis to a Flow Computer

Typically, the 2700 transmitter sends a pulse to the flowcomputer where net volume is calculated.

The pulse should represent gross volume.

Density (via analog or RS485) should represent flowing density.

All net volume calculations are then performed in the flowcomputer which has temperature and pressure inputs fromindividual line transmitters. Flow computers are required to meetAPI MPMS Chapter 21.2 for custody transfer.

The above application does not require petroleum

software in the 2700.


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Model 2500/2700 Output AssignmentsConfigurable IO Output Board

Analog OutputMass FlowVolume FlowDensityTemperatureDrive Gain

Frequency Output(not independently assignable)Mass FlowVolume Flow

mA HARTPv = Mass Flow

Volume FlowDensityTemperatureDrive GainExternal PressureExternal TemperatureAPI Corrected Density

API Corrected Volume FlowAPI Corrected Volume TotalAPI Corrected Volume InventoryAPI Batch Avg Corrected DensityAPI Batch Avg TemperatureAPI CTL (table used)

Sv = Same as PvTv = Mass flowVolume FlowAPI Corrected Volume Flow

Qv = Same as Pv plusMass TotalMass Inventory

Volume TotalVolume Inventory

Display CapabilitiesView Process VariablesView and Acknowledge AlarmsStart, Stop, Reset TotalizersPerform Output Simulation TestsChange Measurement UnitsScale Outputs

Cannot Change Channel Assignments

Discrete OutputFWD / REVEvent 1

Event 2Event 1 or 2Flow SwitchZero In ProgressFault

Discrete InputNoneStart ZeroReset Mass TotalReset Volume TotalReset Corrected Volume Total


18/19

API Temperature Input Option #1

To meet API requirements, a user-supplied externaltemperature detector can be installed remotely by theuser. This external temperature detector, instead of theRTD inside the sensor, is wired to a 9-wire 2700.

The external RTD must be accurate to 0.1F (0.05C).

RTD calibration information must be configured in thetransmitter.


19/19

API Temperature Input Option #2

To meet API requirements, a user-supplied externalHART temperature transmitter can be installed remotelyby the user. This external transmitters process variableis read into the 2700 via HART.

Using an external HART transmitter eliminates theprimary analog of the 2700 from other use.

The external RTD must be accurate to 0.1F (0.05C).

HART polling for pressure compensation is now available

as a second polled HART variable. This compensation isfor the pressure effect on flow seen on some sensors,not pressure compensation for API Calculations.

model 2700 with api

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