Metering BS&W Monitor/Probe Verification/Calibration: AIT TRANSMITTER ANALYZER LACT QUALITY SKID

Ensure that the equipment is isolated and locked off.

NOTE: WRITE THE MODEL AND SERIAL NUMBER OF THE EQUIPMENT ON THE WORK ORDER.

BS&W Monitoring Instruments Calibration Procedure.

BS&W measurement is an important variable and is used to correct the gross volume to net (Dry). The transmitters and computer inputs should be checked at 3 monthly intervals.

Any variations outside of specification should be noted and investigated. If a monitor or computer is changed then this should be recorded, and the test performed again. All test equipment should be calibrated at a traceable facility, (e.g. UKAS, NIST or equivalent.) and the calibration validity of one year complied with. Details from the calibration certificate for the test equipment actually used should be recorded on the calibration form.

Instrument type and serial numbers where applicable should also be recorded on the calibration form. The BS&W measurement on the skids, is by INVALCO model WCM 7200 / 7300 series Transmitters, measurement by in line variable dielectric constant type probes fixed in to spools, with a 4-20mA signal back to the flow computer from the transmitter head. During the calibration checks the electrical current is measured and recorded in terms of the voltage generated across a 50ohm standard resistance, and is noted at the same time as the BS&W indication at the flow computer display. This test is therefore a combined check of the conditioning resistor.

ADC within the Omni flow computer, as well as the transmitter itself. Each analogue input to the Omni has it's own ADC. This can be calibrated and adjusted independently of the BS&W transmitter.

BS&W Transmitter Calibration Procedure

Note: This calibration must take place prior to the BS&W Probe Calibration Procedure as the instrument is actually fed false values to determine correct output.

Frequency: Transmitter Calibration: 3 monthly.

Tolerance: Transmitter calibration: +/- 0.25% of span.

ADC Input to flow computer: +/- 0.02% of span.

Transmitter ranges: 0 - 5% maximum for 7200 model. Although this may require change as future water content increases. 0 - 25% maximum, for 7300 model.

Test Equipment: Invalco BS&W Monitor using set output values 50 Ohm Standard resistance.

Digital Voltmeter (6 ¿ digit).

Laptop PC with calibration spreadsheets.

2 Plant radios for communication. (Two persons required for test)

Procedure:

a) Ensure that the meter stream is off line, and will continue to be so for the duration of the test. If this is not possible an override value can be entered, by going into diagnostic mode in the Omni Flow computer.

b) Check all instrument and test equipment serial numbers, and that the test equipment has current certification.

c) To avoid short circuits lift the +24v supply fuse for the loop in the panel before disconnecting any wiring.

d) Connect the 50 ohm standard resistor in series with the current input signal line to the flow computer(s) at the panel field terminals. Connect the DVM across the standard resistor to measure 0.2-1.0v to 5 decimal places.

e) Check the transmitter reading at 0%, 25%, 50%, 75%, 100% of range. This can be achieved by inputting false values for cuts via the Monitors user and calibration interface. Over-range and check from 100% and back down to 0%. At each point record the Flow computer displayed values for temperature, and the voltage indicated on the DVM.

f) Enter the readings into the spreadsheet in the appropriate "as found" columns.

g) If the BS&W transmitter part of the calibration check is a "Fail," as indicated on the spreadsheet, then the transmitter will have to be re-ranged and set points adjusted.

h) Repeat the test, and complete a new "as left" spreadsheet, or "as left" columns as appropriate, also note that adjustments have been made.

i) If the test fails on ADC error, then the flow computer ADC will have to be calibrated. A stable current source is connected at the panel field terminals in place of the transmitter.

Note: This does not have to be "certified test equipment" as the standard resistor and DVM are used to measure the input current. A 10 point (0-100-0%) calibration is then performed on the Omni ADC, and the results entered on the "ADC Re-calibration" spreadsheet. See Omni manual for details on ADC adjustment.

j) To avoid short circuits again lift the +24v supply fuse for the loop in the panel before disconnecting any wiring. Re-connect the wiring and put the transmitter back into service.

k) Return the Omni to normal operation and remove any override values that may have been entered.

l) Ensure that all readings, notes, instrument and calibration equipment data have been recorded on the calibration form spreadsheet.

m) Copy the calibration sheets to the sgs400 section of the "H" drive, saving the spreadsheets to the correct train and month file. Create a pdf format version of all the sheets to be attached electronically to the Work

Order.

BS&W Probe Calibration

Note: This calibration must be performed immediately after the Transmitter calibration. The calibration is best performed either early morning or mid-afternoon, this is because two inputs will be performed at different temperatures.

Frequency: 3 monthly.

Tolerance: N/A.

Test Equipment: Laboratory Sample bottle minimum 1 litre to achieve a reasonable representative sample.

Karl Fischer Coulomb-meter or Equivalent.

Procedure:

a) Ensure that Flow has stopped through the desired stream.

b) Once flow has ceased through the stream, it must be left for 4 - 6 hours to stabilise and any water content to separate.

c) A sample of the Oil must be taken from the highest point available and as near to the monitor as feasibly possible and taken to the Chemists Laboratory for analysis. (Preferably in the morning).

d) Obtain the BS&W results from this sample from the Chemist's Laboratory.

e) Enter the results of the sample into the unit following the Manufacturer data on Setup and calibration.

f) Allow the temperature to rise or fall by at least 3 Deg C and perform steps c) though to e) again, the unit will auto compensate for the temperature change to establish a constant which will distinguish between temperature effect on the probe and actual contamination by water and sediment.

g) Return the unit to normal operation and resume flow through the stream.

h) Sign-off Work Permit and return to operations.

i) Report all findings to supervision and document in CMMS.