draft - technical protocol the liquid flow rate comparison in the...

Technical protocol: NIMT.MW-L1/2017 Page1

Draft - Technical protocol

for

the liquid flow rate comparison

in the range (25 – 120) litre/min of Coriolis mass flowmeter

June 2017

Pilot Laboratory

Flow Laboratory

National Institute of Metrology (Thailand)


1. OBJECTIVE

The objective of this inter-laboratory comparison is to demonstrate the degree of equivalence of flow standard in the participating laboratories in the range from (25 – 120) litre/min. The results of this comparison will be essential to perform the real calibration in the high range.

2. PARTICIPATING LABORATORIES

The list of participating laboratory with the addresses and contact person are shown below.

2.1 Ms. Khanistha Leetang Flow laboratory, National Institute of Metrology (Thailand), (NIMT) CMC: Volume flowrate 0.05% Address: 3/4-5 Moo.3, Klong 5, KlongLuang, Pathumthani 12120 Tel.: +662-577-5100 ext. 2103, 2101 Fax: +662-577-3659 E mail: [email protected]

2.2 Mr. Boonsong Rieantragul Endress+Hauser (Thailand) Ltd.(E&H) CMC: - Address:111 Moo 4 Bangkruai-Jongthanom Road, Mahasawat, Bangkruai 11130 Tel.:+66 2 447 6900-9 Ext.404 Fax: +66 2 447 6920-1 E mail: [email protected]

2.3 Mr. Tassanai Suksukon CMC: Volume flowrate 0.064%

Mass flowrate 0.040% Miracle International Technology Co.,Ltd. (MIT) Address: 214 Bangwaek Rd., Bangpai, Bangkae Bangkok, 10160 Tel.: +662-865-4647-8, +662-865-4642 Fax: +662-865-4649 E mail: [email protected]

2.4 Mr. Mongkol Kitkayan CMC: Volume flowrate (up to 60 lpm) 0.028%, 0.05% at 60 lpm up

Mass flowrate (up to 60 lpm) 0.014%, 0.04% at 60 lpm up Flowlab& service Co.,Ltd (Flowlab) Address: 271Sukumvit Road, Tambol Map Ta Phut, Muang District, Rayong 21150 Tel.: +663-891-1321-2 Fax: +663-891-1320 E mail: [email protected]


3. MEASUREMENT SCHEDULE

For this comparison, the Coriolis mass flowmeter is circulated as the transfer standard (TS) for the comparison and the measurement shall be started by NIMT. Then it will be transported to each participant shown in table 1. In order to observe the drift occurred during its traveling, the TS shall be measured again at NIMT. The participant is responsible for receiving and delivering the TS to the NIMT. Hand-carried of the TS is recommended.

TABLE 1 MEASUREMENT SCHEDULE

№ Organization Period of measurement Tentative date of delivery

Receive/Return

1 NIMT 5 June 2017 – 9 June 2017

2 MIT 12 June 2017 – 23 June 2017 12 June 2017

3 NIMT 26 June 2017 – 30 June 2017 26 June 2017

4 E&H 3 July 2017 – 14 July 2017 3 July 2017

5 NIMT 17 July 2017 – 21 July 2017 17 July 2017

6 Flowlab 24 July 2017 – 4 August 2017 24 July 2017

7 NIMT 7 August 2017 – 11 August 2017 7 August 2017

Measurement period of each laboratory is noted to be strictly schedule. Participants shall deliver the TS to the next laboratory following measurement schedule as soon as the measurement is complete. Otherwise, the measurement period will be deviated from the schedule.

4. TRANSFER STANDARD AND PACKAGE

4.1 Transfer standard (TS)

The details of TS are shown below.

Equipment : Coriolis mass flowmeter Manufacturer : Micro Motion Model : CMFS075M336N0AVEKZZ Serial Number : 12138474 Nominal flow rate : 6270 kg/h Maximum flow rate : 12500 kg/h Mass/volume accuracy: ±0.10% of mass flow rate Density accuracy : ±0.0005 g/cm3

Temperature accuracy : ±1°C ± 0.5% of reading Zero stability : 0.300 kg/h Temperature condition: (-40 to 60)°C

Connector : A-LOK 3/4 inch


Figure 1 Transfer standard – CMFS075M336N0AVEKZZ

4.3 Packaging

The TS is transported by hand-carry with care in the special box prepared by NIMT. The box has size in (width x height x depth) (mm) is 540 x 660 x 480. The box contains;

• One Transfer standard (TS) – CMFS075M336N0AVEKZZ

• One power cord • Two connectors (VCO ¾” to A-LOK ¾”) • Pulse output signal cables


Figure 2 Transfer standard box

5. MEASUREMENT PROCEDURES

5.1 Installation of transfer standard (TS)

The high oscillation frequency of the measuring tubes ensures that the correct operation of the measuring system is not influenced by pipe vibrations. NIMT recommend the following installation version when mounting horizontally: measuring device standing on a firm support base according to Figure 3.

Important note: The TS has to be measured the flowrate in forward direction mode.

Figure 3 Installations of transfer standard

5.2 Zeroing the flowmeter

Zeroing the flowmeter establishes the flowmeter’s point of reference when there is no flow. However, you may wish to perform a field zero to meet local requirements or to confirm the factory zero. The default zero time is 20 second.

• Preparing for the zero procedure

1) Apply power to the flowmeter. Allow the flowmeter to warm up for approximately 20 minutes.

2) Run the process fluid through the sensor until the sensor temperature reaches the normal process operating temperature.


3) Close the shutoff valve downstream from the sensor.

4) Ensure that the sensor is completely filled with fluid.

5) Ensure that the process flow has completely stopped.

6) In this case, using the display menu, see figure 4 and 5.

Figure 4 Display menu – Flowmeter zero procedure

Figure 5 Display menu – Flowmeter zero procedure


5.3 Managing totalizer

Figure 6 Display menu – Managing totalizers and inventories

5.4 Configuring the frequency output

Figure 7 Display menu – Configuring the frequency output

5.5 Setting the TS

The TS has to be set a default (factory setting) in all function, except output signal function. The output signal has to be set pulses output and active-high pulse output.

ACTIVE-POSITIVE mode is power supply to the frequency output by means of the device-internal power supply. Figure 8 shows the quiescent state (at zero flow) of TS, the output signal level at the terminals is 0 V.

Figure 8 Installations of transfer standard

Figure 9 shows the operating status (flow present) of TS, the output signal level changes from 0 V to a positive voltage level.

Process variable VFLOW

MFLOW (Mass flow)

(Volume flow)


Figure 9 Active-high output measurement procedures

5.6 Calibration procedures

The participating laboratories shall use a calibration procedure ordinarily used during calibration service for customers. Only the instructions given below must be fulfilled.

1) The TS should be installed according to Figure 3 and measured in horizontal position.

2) For zero stability testing, set mass flow cutoff 0 kg/min and volume flow cutoff 0 litre/min.

3) Testing the zero stability of TS, set the calibrator system at 0 litre/min and record all data of TS as shown on Table 2.

4) Testing the zero stability of TS, set the calibrator system at 0 kg/min and record data of TS as shown on Table 3.

5) The water pressure should be set at operating pressure. 6) For volumetric flowrate measurement, set volume flow cutoff 0.105 litre/min. 7) For volumetric flowrate measurement, the TS has to be measured at 5 nominal

flow rates and 1 nominal Reynolds number; 25 litre/min, 40 litre/min, 60 litre/min, 100 litre/min, 120 litre/min and Reynolds number 58300, respectively. The measurement in each flow rate should be repeated at least 5 times. The set flowrate for each measurement should not deviate from nominal value less than ± 3%. The result of the measurement should be recorded on the measurement sheet as shown in Table 4.

8) For mass flowrate measurement, set masse flow cutoff 0.105 kg/min. 9) For mass flowrate measurement, the TS has to be measured at 5 nominal flow

rates and 1 nominal Reynolds number; 25 kg/min, 40 kg/min, 60 kg/min, 100 kg/min, 120 kg/min and Reynolds number 58300, respectively. The measurement in each flow rate should be repeated at least 5 times. The set flowrate for each measurement should not deviate from nominal value less than ± 3%. The result of the measurement should be recorded on the measurement sheet as shown in Table 5.

10) During the measurement, laboratory temperature must be close to (20-30) ±2°C and reference water temperature is 30°C.

11) The TS should be kept in laboratory conditions for at least 24 hours before measuring begins.

12) It is recommended that the TS should be exercised before starting the measurement at the flowrate 120 litre/min for 5 times.


6. REYNOLDS NUMBER CALCULATION

The Reynolds number (Re) is an important dimensionless quantity in fluid mechanics used to predict flow patterns in different fluid flow situations. For flow in a pipe or tube, the Reynolds number can be calculated by

µρA

QD=Re (1)

Where Re is the Reynolds number. ρ is the density of water (kg/m3).

Q is the flowrate (m3/s).

D is the diameter of the tube (m). A is the pipe's cross-sectional area (m2). µ is the dynamic viscosity of the fluid (kg/(m*s)) which can be calculated by[3]

140)247.8/(T5 10)10414.2( −− ××=µ (2)

Where T is the temperature of water (K). K = °C + 273.15

7. EN RATIO CALCULATIONS

Error of the TS shows the relationship of the difference between the flow rate indicated by the TS and that of the laboratory standard. The error can be calculated by

STDVTSVQV QQE __ −= (3)

STDMTSMQM QQE __ −= (4)

Where QVE is the error of volumetric flowrate by TS (litre/min)

QME is the error of mass flowrate by TS (kg/min)

TSVQ _ is the volume flow rate measured by the TS (litre/min)

STDVQ _ is the volume flow rate measured by the standard (litre/min)

TSMQ _ is the mass flow rate measured by the TS (kg/min)

STDMQ _ is the mass flow rate measured by the standard (kg/min)

The results of the comparison are determined by the following the degree of equivalence, En.

22nimtLab

nimtLabn

UU

EEE

+

−= (5)

The measurement is satisfactory if En≤ 1.


Where En is the degree of equivalence

LabE is the error of TS value from participating laboratory

nimtE is the error of TS value from NIMT

LabU is the expanded uncertainty of TS value from participating laboratory

nimtU is the expanded uncertainty of TS value from NIMT

8. REPORT OF THE RESULTS

Each participant shall report the measurement result to the pilot laboratory within two weeks after finishing the measurement using the attached Table 2 to Table 5. The uncertainty shall be estimated and combined according to the JCGM 100:2008 Evaluation of measurement data - Guide to the Expression of Uncertainty in Measurement (GUM 1995 with minor corrections).

9. REFERENCES

[1] Vahit CIFTCI, “TECHNICAL PROTOCOLFOREURAMET PROJECT – 1162: Intercomparison of Water Meter Reference Standard”, November 2010. [2] “Technical Protocal for Bilateral Comparison between NMIJ/AIST and KRISS APMP.M.FF-S1.2015”, November 2015. [3] https://en.wikipedia.org/wiki/Viscosity#Dynamic_viscosity [4] https://en.wikipedia.org/wiki/Reynolds_number [5] JCGM 100: 2008 "Evaluation of measurement data - Guide to the expression of uncertainty in measurement"


TABLE 2: MEASUREMENT FORM – ZERO STABILITY TESTING

Organization:________________________________________

Experiment date (dd/mm/yy) :___________________________

Volume flow cutoff : ___0___ litre/min

No. Pressure Time Start

Total volume Stop

Total volume Diff. Total

volume Flowrate

(bar) (min) (litre) (litre) (litre) (litre/min) 1. 8 2. 8 3. 8

Note: The maximum flowrate from zero stability testing shouldn’t larger than 0.005 litre/min. Therefore, the maximum of difference flowrate is . litre/min

TABLE 3: MEASUREMENT FORM – ZERO STABILITY TESTING

Organization:________________________________________

Experiment date (dd/mm/yy) :___________________________

Mass flow cutoff : _____0____ kg/min

No. Pressure Time Start

Total mass Stop

Total mass Diff. Total

mass Flowrate

(bar) (min) (kg) (kg) (kg) (kg/min) 1. 8 2. 8 3. 8

Note: The maximum flowrate from zero stability testing shouldn’t larger than 0.005 kg/min. Therefore, the maximum of difference flowrate is . kg/min


TABLE 4: MEASUREMENT FORM –VOLUMETRIC FLOWRATE

Organization:__________ _ ___________ Volume flow cutoff : __0.105__ litre/min

Experiment date (dd/mm/yy) :______________ Operating pressure . bar

Room temperature: Before: .°C After: .°C

Humidity condition: Before: .%Rh After: .%Rh

No. TS Flowrate

Water temperature of STD

Water density of TS

Time

Volumetric flowrate of

STD

Volumetric flowrate of

TS

Uncertainty of volumetric flowrate

UQv (k=2)

(litre/min) (°C) (kg/m3) (second) (litre/min) (litre/min) (litre/min)

1 25

2 40

3 60

4 100

5 120

6 Re58300

Name of calibrator:________________________


TABLE 5: MEASUREMENT FORM –MASS FLOWRATE

Organization:__________ _ _____ __ Mass flow cutoff : __0.105__ kg/min

Experiment date (dd/mm/yy) :______________ Operating pressure . bar

Room temperature: Before: .°C After: .°C

Humidity condition: Before: .%Rh After: .%Rh

No. TS Flowrate Water temperature of STD

Time

Mass flowrate of STD

Mass flowrate of TS

Uncertainty of mass flowrate,

UQm (k=2)

(kg/min) (°C) (second) (kg/min) (kg/min) (kg/min)

1 25

2 40

3 60

4 100

5 120

6 Re 58300

Name of calibrator:________________________


Appendix: Calibration constants

TABLE 6: CALIBRATION CONSTANTS

Number Parameter Value 1 D1 0 2 D2 1 3 DT 4.35 4 FD 1497 5 Dens MF 1.00000 6 Vol MF 1.00000 7 FCF 74.105 8 FT 4.44 9 Mass MF 1.00000 10 Zero (uSec) -0.0256 11 Mass flow cutoff (kg/min) 0.105 12 Volume flow cutoff (litre/min) 0.105

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