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Technical Protocol for the CIPM

By Bill Ramos,2014-01-20 04:07
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Technical Protocol for the CIPM

    Technical Protocol for the CIPM

    Key Comparison (KC) for Water Flow: CCM.FF-K1

    KRISS (Pilot Lab) Contacts:

    Dr J. S.Paik; phone: +82-42-868-5035 e-mail: jspa@kriss.re.kr

     Mr K. B.Lee; phone: +82-42-868-5316 e-mail: kblee@kriss.re.kr

     Mr B. R. Yoon; phone: +82-42-868-5312 e-mail: bryoon@kriss.re.kr

    Contents

Outline

     Description of the Transfer Standard and its Transportation

     Handling

     Assembling of the Transfer Standard

     Measurement procedure

     Reporting of the measurement results

     Data Analysis

    Outline

     The CIPM KC for water flow, CCM.FF-K1, is one of 6 KCs in different fluid measurement areas planned by the CIPM Working Group for Fluid Flow (WGFF), in accord with the Mutual Recognition Arrangement (MRA). The objective of MRA is to quantify the equivalence of the national standards for water flow measurements among National Metrology Institutes (NMIs); seewww.bipm.org. The WGFF plan is to initiate this quantification of NMI flow standards with CCM.FF-K1.

     The KC for water flow is to compare the standards as realized in the participating NMIs and should be conducted at the highest metrological level. Transfer standards having the best feasible reproducibility are needed in order to quantify NMI flow measurement uncertainties at the 0.1 % levels or better; reproducibilities in the range of 0.05 % or better are considered feasible, but metrologically necessary for effective comparisons.

     KRISS has been selected as the pilot laboratory for water flow with two pivot laboratories located in the other two RMOs where the participating NMIs are located. NEL in the UK and CENAM in Mexico are the pivot laboratories. CCM.FF-K1 results will be analyzed and reported by the pilot laboratory.

    Description of the Transfer Standard and its Transportation

The Transfer Standard is designed and used to compare flow standards among the NMIs.

    This Standard is designed to allow the NMI participants to use all of their normal, routine capabilities to calibrate this Standard in the same conditions in each lab. The Standard is designed to be very stable so that high confidence can be placed in the results of the lab comparisons.

     The original transfer standard consists of 3 pipe units of the nominal diameter of 101.6 mm (4 inches), 3 flowmeters, associated instrumentation, and a data acquisition system. This data acquisition is only used to set the test flows and to monitor the transfer standard; it is

not to be used by the participating NMI to perform any aspect of the calibrations. The NMI is

    to use all of its normal, routine procedures, personnel, instruments, software, etc. to calibrate

    the transfer standard in the specific test conditions. The total length of the flowmeter package

    is 3.36 m. The data acquisition system (data logger and notebook computer) monitors the

    transfer standard by collecting flow signals from the 3 flowmeters, and the pressure and

    temperature transmitters in the transfer standard. The 3 flowmeters are: 1.) an ultrasonic

    flowmeter (Changmin Tech, UR-1000) which is used to monitor the pipe flow profile entering

    the transfer standard, 2.) a Coriolis flowmeter (Endress+Hauser, Promass 80), and 3.)a

    turbine meter (Exact Flow, EFM64DR-W-C-T1-B-X0. The Coriolis meter generally does not require zero point adjustment. However it is

    recommended to check zero point after every pipework change. If zero point adjustment is

    required, the enclosed adjustment procedure should be followed.

     If any step in this test procedure cannot be followed, the KRISS personnel listed on page 1

    should be contacted to plan an appropriate response to the situation.

Unit # 1: The 5 path ultrasonic flowmeter is placed between two spools.

Unit # 2: A flow conditioner is placed between two spools.

Unit # 3: A spool with pressure PT and temperature TT taps.

Flowmeter 1: The Coriolis mass flowmeter:

Flowmeter 2: The turbine meter:

     o3 The high test flow rate at about 20 C is about 159 m/h and the expected pressure loss

    through the whole transfer standard package is about 0.6 bar. At least 1 bar of pressure relative

    to the atmosphere should be maintained downstream of the exit of the transfer standard. The o3low test flow rate at about 20 C is about 72 m/h. These units are transported between the participating NMIs with sufficient care that the

metrological characteristics of the transfer standard are maintained as determined in the

    Initiating/Pilot lab.

    Assembling of the Transfer Standard

The CCM.FF-K1 test procedure for the water flow tests dictates the configurations for the

    meters used. This test plan is sketched in Attachment No. 1. In configuration 1, the up-stream

    meter is the Coriolis flowmeter and the down-stream meter is the turbine meter. In configuration

    2, The up-stream meter is the turbine meter and the down-stream meter is the Coriolis

    flowmeter, see the meter configurations shown in Attachment No. 2.

     Configuration 1

     Face the inlet flange of the Coriolis flowmeter against the outlet flange (Flange # 2) of the

    Unit #1 and bolti together.

     Align and bolt the inlet flange (Flange #3) of Unit #2 on the outlet flange of the Coriolis

    Flowmeter.

     Align and bolt the inlet flange of the turbine meter and the outlet flange (Flange #4) of

    Unit #2.

     Align and bolt the inlet flange (Flange #5) of Unit #3 and the outlet flange of the turbine

    meter.

Configuration 2

     Face the inlet flange of the turbine meter against the outlet flange (Flange # 2) of the Unit

    #1 and bolt together.

     Align and bolt the inlet flange (Flange #3) of Unit #2 on the outlet flange of the turbine

    meter.

     Align and bolt the inlet flange of the Coriolis flowmeter and the outlet flange (Flange #4)

    of Unit #2.

     Align and bolt the inlet flange (Flange #5) of Unit #3 and the outlet flange of the Coriolis

    flowmeter.

    Installation

     Install the transfer standard package in the test section of the water flow standard system. End

    connections of the transfer standard package are ANSI 150 lb Raised Face Flanges of the

    nominal diameter 10.16 mm (4 inches)No special measures such as supports are necessary for

    the Coriolis mass flowmeter. Supprot should be provided under the 6 D spool downstream of the

    flow conditioner (unit # 2).

    • Connect the data acquisition system; this system consists of the data logger and notebook

    computer and needs a 220 V power connection. For detailed H/W connection instructions and

    S/W execution procedure, refer to the Annex.

    • Assure that the different sensors are correctly connected to the data acquisition system

    Slowly fill the flow system with water so that the turbine meter rotors do not produce

    frequencies higher than 600 Hz.

     In the case of electrical power failure, check the fuse located near to the power plug.

    Measurement procedure

Through this measurement procedure, the lab should perform all of the normal, routine

    procedures for calibrating flow meters in these conditions. The temperature and pressure

    instruments of the transfer standard are not to be used to substitute for the labs normal

    instruments.

    A. Meter Package Test Procedure I Configuration 11. Install the meter package as noted above.

    2. Turn all electrical systems on.

    Connect the time-signal from the lab’s capability to perform the timed-collection, i.e., the

    clock starting and stopping events-into the notebook computer so that this computer can

    be synchronized with the normal water collection procedures done in the lab. This time

    signal connection should in no way influence the normal timing capability used in the lab.

    3. Perform pre-test routine (Removal of trapped air, pre-loading, etc.).

    4. Adjust valves for the high flow rate.

    Setting the high flow:

     ( The Roshko number for the Cardinal Test Flow condition for the downstream meter is 24813168 ; Roshko number (Ro) is defined mathematically as Ro = (f D)/ ??where f is the

    mean meter frequency, D is the meter diameter and ??is the kinematic viscosity of water )

    After the temperature through the transfer standard reaches equilibrium, the temperature

    sensor of the transfer standard is read, and the lab staff is asked for their kinematic

    viscosity for their water at this temperature. The value given is keyed into the notebook

    computer so that, for the specified Roshko number, the desired frequency from the

    downstream flowmeter can be achieved. This frequency to be produced by the lab

    personnel using their normal procedures so that the desired frequency is within 10 Hz of

    the target value. When this frequency set is satisfactory, the ratio of the frequencies from

    the upstream and downstream meters should be within +/- 0.3% of the expected value, see

    Table of Expected Values for these Ratios. If this does not occur, the test should be stopped

    and the PILOT Lab should be contacted to decide on a plan of action.

    5. When the lab conditions are considered appropriate for meter calibration under these

    conditions, the normal, routine procedures used in the Lab are performed to calibrate both

    of the tandem flowmeters.

    6. Concurrent with this calibration procedure, the notebook computer reads and records as

    rapidly as is feasible, the temperature and pressure of the water, the flow signals from both

    flowmeters, and the chordal plane velocity sensing results from the ultrasonic flowmeter.

    These results are then stored in the notebook computer.

    7. The Lab results are processed by lab personnel according to the lab’s normal, routine

    procedures and results for meter factors are put into the form of Strouhal No. and for flow

    rate in the form of Roshko No., and these are tabulated, see example in the attached

    EXCEL spread sheet.

    8. Repeat this test at the high flow rate condition 4 more times.

    9. After the high flow tests are done, adjust valves for the low flow rate.

    Setting the low flow.

    ( The Roshko number for the Cardinal Test Flow condition for the turbine meter is

    2180052). The procedures to set the low flow are done as described in step 4, above.

    10. Repeat the test at low flow rate 5 times

    11. Stop the flow and turn off the flow system. The data acquisition system should remain

     on.

B. Meter Package Test Procedure II Configuration 1

    1. Wait 5 minutes

    2. Turn the system on

    3. Perform pre-test routine (Removal of trapped air, pre-loading, etc.)

    4. Adjust valves for the low flow rate

    ( The Roshko number for the Cardinal Test Flow condition for the downstream meter is

    2180052) ). The procedures to set the low flow are done as described in step A-4, above

    5. When the flow conditions are judged by the lab personnel to be satisfactory, according to

    normal lab experience and procedures, 5 successive calibrations are done.

    6. After the low flow tests are completed, adjust valves as before for the high flow rate

    ( The Roshko number for the Cardinal Test Flow condition for the downstream () meter is

    4813168) ). The procedures to set the high flow are done as described in step 4, above

    7. Repeat the test at high flow rate 5 times

    8. Stop the flow and turn the flow system off

    9. Change the tandem meter configuration to Configuration 2.

    C. Meter Package Test Procedure III Configuration 2 1 Turn the flow system on and slowly fill the pipeline so that the turbine meter frequency does

    . not exceed 600 Hz

    2. Perform pre-test routine (Removal of trapped air, pre-loading, etc.)

    3. Adjust valves for the low flow rate

    ( The Roshko number for the Cardinal Test Flow condition for the downstream (Coriolis)

    flowmeter is 2500000) The procedures to set the low flow are done as described in step A-

    4, above

4. Repeat the test at low flow rate 5 times

     5. Adjust valves for the high flow rate

    ( The Roshko number for the Cardinal Test Flow condition for the downstream (Coriolis)

    flowmeter is 5500000) The procedures to set the high flow are done as described in step

    A-4, above

6. When the flow conditions are judged by the lab personnel to be satisfactory, according to

    normal lab experience and procedures, 5 successive calibrations are done.

    7. Stop the flow and turn the flow system off; leave the data acquisition on.

    D. Meter Package Test Procedure IV Configuration 2 1. Wait 5 minutes

    2. Turn the flow system on and slowly fill the pipeline so that the turbine meter frequency does

    not exceed 600 Hz.

    3. Perform pre-test routine (Removal of trapped air, pre-loading, etc.)

    4. Adjust valves for the high flow rate

     ( The Roshko number for the Cardinal Test Flow condition for the downstream (Coriolis)

    flowmeter is 5500000) The procedures to set the high flow are done as described in step

    A-4, above

    5. When the flow conditions are judged by the lab personnel to be satisfactory, according to

    normal lab experience and procedures, 5 successive calibrations are done.

    6. Adjust valves for the low flow rate

    ( The Roshko number for the Cardinal Test Flow condition for the downstream (Coriolis)

    flowmeter is 2500000) The procedures to set the low flow are done as described in step A-

    4, above

    7. Repeat the test at low flow rate 5 times

    8. Stop the flow and turn the flow system off

    9. Remove the meter package from the system

    10. Disassemble the meter package by pipe units and flowmeters

    E. Meter Package Test Procedure V Configuration 2 1. Reassemble and Install the meter package. Connect instrumentation to their respective

     connectors as before

     2. Slowly fill the pipeline so that the turbine meter frequency does not exceed 600 Hz.

     Turn the flow system on

    3. Perform pre-test routine (Removal of trapped air, pre-loading, etc.), as before

    4. Adjust valves for the high flow rate

    ( The Roshko number for the Cardinal Test Flow condition for the Coriolis flowmeter is 5500000) The procedures to set the high flow are done as described in step A-4, above 5. Repeat the test at high flow rate 5 times

    6. Adjust valves for the low flow rate

    ( The Roshko number for the Cardinal Test Flow condition for the Coriolis flowmeter is 2500000) The procedures to set the low flow are done as described in step A-4, above 7. Repeat the test at low flow rate 5 times

    8. Stop the flow and turn the flow system off

F. Meter Package Test Procedure VI Configuration 2

    1. Wait 5 minutes

    Turn the flow system on

    2 Perform pre-test routine (Removal of trapped air, pre-loading, etc.)

    3. Adjust valves for the low flow rate

    ( The Roshko number for the Cardinal Test Flow condition for the Coriolis flowmeter is 2500000) The procedures to set the low flow are done as described in step A-4, above

    4. Repeat the test at low flow rate 5 times

    5. Adjust valves for the high flow rate

    ( The Roshko number for the Cardinal Test Flow condition for the Coriolis flowmeter is 5500000) The procedures to set the high flow are done as described in step A-4, above 6. Repeat the test at high flow rate 5 times

    7. Stop the flow and turn the system off

    8. Change the meter configuration to Configuration 1

G. Meter Package Test Procedure VII Configuration 1

    1 Slowly fill the pipeline so that the turbine meter frequency does not exceed 600 Hz.

    2. Turn the flow system on

    3..Perform pre-test routine (Removal of trapped air, pre-loading, etc.)

    4 Adjust valves for the low flow rate

    ( The Roshko number for the Cardinal Test Flow condition for the turbine meter is 2180052) The procedures to set the low flow are done as described in step A-4, above 5. Repeat the test at low flow rate 5 times

    6 Adjust valves for the high flow rate

    ( The Roshko number for the Cardinal Test Flow condition for the turbine meter is 4813168) The procedures to set the low flow are done as described in step A-4, above 7 Repeat the test at high flow rate 5 times

    8 Stop the flow and turn the system off

H. Meter Package Test Procedure VIII Configuration 1

    1 Wait 5 minutes

    2. Turn the system on

    3. Perform pre-test routine (Removal of trapped air, pre-loading, etc.)

    4. Adjust valves for the high flow rate

    ( The Roshko number for the Cardinal Test Flow condition for the turbine meter is 4813168) The procedures to set the low flow are done as described in step A-4, above 5 Repeat the test at high flow rate 5 times

    6 Adjust valves for the low flow rate

     ( The Roshko number for the Cardinal Test Flow condition for the turbine meter is

    2180052)Repeat the test at low flow rate 5 times The procedures to set the low flow are done as described in step A-4, above

7 Stop the flow and turn the system off

    8.Remove the transfer standard from the flow system, dissemble the transfer standard and

    package in the containers in the way it arrived.

    9. Ship the transfer standard, according to instructions to the next designated NMI.

    10. Put all data in requested formats on appropriate spread sheets and send to the Pilot Lab

    and notify Pilot lab as to the data sent and notify the next NMI regarding the shipment of

    the transfer standard.

    Reporting of the measurement results

Completed report of the form of Attachment No. 3 shall be reported to the Pilot Lab (KRISS)

    as soon as possible.

     With the report, uncertainty budget of the water flow standard system, equations of density

    and viscosity of water, and the equation for Buoyancy correction used to do this specific test in

    each participating laboratory shall be presented.

    Data Analysis

Data analysis will be done according to MRA and appropriate statistical guidelines

    After the completion of statistical treatments, the reference value will be determined by taking

     the Median at each test condition.

     Draft A will be produced and sent for reviews according to MRA guidelines

     Draft B will be produced and sent for reviews according to MRA guidelines

Table for Cardinal Flow Test Conditions (Roshko Nos.) and

    Expected Ratios of Tandem Meter Frequencies

    (f-Up/f-Dn)

    (Cor-Up;Turb-Dn)

    (Turb-Up;Cor-Dn)

Attachment No. 1

     Statistically Sufficient Multiple-Meter Transfer Standard Tests

     DAY Test/Cnfg. FLOWS* METERING ARRANGEMENT

     FLOW A/1 1 ON/H-L/OFF FDS C T

     FLOW 1 ON/L-H/OFF B/1 FDS C T

    FLOW

     FDS 1 ON/L-H/OFF C/2 T C

     FLOW 1 FDS D/2 ON/H-L/OFF C T

     Disassemble and Reassemble

     FLOW

    2 E/2 ON/H-L/OFF FDS C T

     FLOW

     2 F/2 ON/L-H/OFF FDS C T

     FLOW

    2 G/1 ON/L-H/OFF FDS C T

     FLOW

     2 H/1 ON/H-L/OFF FDS C T

At each flow(Specd by Roshko No.), 5 “FDS (Flow Determination System) runs” are done to produce “factors” for both meters C(Coriolis) & T(Dual

    Rotor Turbine); “H” and “L” refer to the selected high and low test flows.

    Attachment No. 2

    Schematic Drawing of Transfer Standard Meter Package

     Coriolis Turbine UFM Meter Meter Flow Conditioner

     Flow F # 3 F # 4 F # 5 F # 6 F # 1 F # 2

    PT

    P 200 200 200 600 300

    3360 (mm)

    Configuration 1

     Turbine Coriolis Flow Conditioner Meter UFM Meter

     Flow F # 1 F # 2 F # 3 F # 4 F # 5 F # 6

     PT P

     200 200 200 600 300

    3360 (mm)

    Configuration 2

    * End connection is nominal 4 inches ANSI 150 lb Raise Face flange with schedule 40 pipes.

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