waterdraw calibration for bi-directional and unidirectional mechanical displacement meter provers

7/27/2019 Waterdraw Calibration for Bi-directional and Unidirectional Mechanical Displacement Meter Provers

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WATERDRAW CALIBRATION FOR BI-DIRECTIONAL AND UNIDIRECTIONAL MECHANICAL DISPLACEMENT METER PROVERS

PURPOSE

The purpose of this procedure is to describe the method used by WaterDraws, LLC to determine the

Base Volume of a prover using "Waterdraw" calibration techniques.

SCOPE

This procedure is applicable for establishing or re-establishing the Base Volume of bi-directional or

unidirectional mechanical displacement meter provers. This procedure complies with the American

etroleum !nstitute A!# $anual of etroleum $easurement %tandards $$%# &hapter '( roving

%ystems( %ection )( ipe rovers rovers Accumulating at *east +,(,,, ulses#( )nd dition( $arch

),,+( and A! $$% &hapter+)( &alculation of etroleum uantities( %ection )( &alculation of

etroleum uantities /sing 0ynamic $easurement $ethods and Volumetric &orrection 1actors( art

'( &alculation of Base rover Volumes by the Waterdraw $ethod( +st dition( 0ecember +223.

PROCEDURE

+., 0efinitions

+.+ The Base rover Volume BV# of a unidirectional pipe prover is defined as the one-

way volume between the detectors of the calibrated measuring section at standard

temperature and pressure e.g.( 4, degrees 1 and , psig in /.%. &ustomary /nits#

+.) The Base rover Volume BV# of a bi-directional pipe prover is defined as the round

trip volume between the detectors of the calibrated measuring section a

WATERDRAW CALIBRATION FOR BI-DIRECTIONAL AND

UNIDIRECTIONAL MECHANICAL DISPLACEMENT METER

PROVERS

standard temperature and pressure e.g.( 4, degrees 1 and , psig in /.%. &ustomary

/nits#.

)., 5equired quipment

6 7!%T &alibrated 1ield %tandard Test $easures

6 Water ump

6 Test %tand with appropriate piping and controls

6 %ump 5eservoir

6 8ne +# &alibrated ressure 9auge

6 Two )# &ertified Thermometers

6 !nterconnecting :oses or iping

6 %top Watch or wrist watch with seconds counter

).+ 1ield %tandard Test $easures; !n the /nited %tates( the 7ational !nstitute of %tandards and

Technology 7!%T# must calibrate the field standard test measures used for waterdraw

calibrations. The <ero mar= on the nec= scale indicates the certified volume of the test measure

at standard conditions or the Base rover Volume B$V#. The liquid level is read in a hori<ontal

plane that is level with the bottom of the meniscus of the liquid in the sight glass. ach field

standard test measure is calibrated with a "to contain" volume and>or a "to deliver" volume( and

both are mar=ed accordingly and as applicable on the 7!%T 5eport of &alibration for the test

measure. The test measure volume that is used by WaterDraws, LLC for this procedure is

always the "to deliver" volume. The drain time for any given test measure is stated on the 7!%T

5eport of &alibration. 1or any test measure that is drained by inverting the measure at an angle

of appro?imately 3, degrees from hori<ontal usually with a capacity of +, gallons less#( the

normally prescribed drain time after the main flow ceases is ten +,# seconds. 1or any testmeasure that is drained by opening a bottom drain valve usually with a capacity of +, gallons

or more#( the normally prescribed drain time after the main flow ceases is thirty

PROVERS

@,# seconds. !t is required that before any test measure is used for a calibration pass( it be

filled and drained in the prescribed manner shortly before beginning the calibration pass. The

number and si<e of required test measures will vary according to prover si<e. &onsult

WaterDraws, LLC for an appropriate si<e combination for a given prover application.

).) Water ump; The water pump>motor combination must be of sufficient capacity delivery rate

and pressure# to be able to push the displacer sphere smoothly through the prover.

).@ Test %tand with Appropriate iping and &ontrols; The test stand piping arrangement and

manifold for distributing the filling valves overhead the various test measures( also

includes a solenoid valve( and an electrical control and indicator bo?. The solenoid valve

is used to control the start and finish of the Waterdraw. A relay interface is required

between +),V solenoid and the +)-)' volt signal to the detector switches. +), volts run

through the detector switches may cause switch damage. 6

).' %ump 5eservoir; The sump reservoir is the container that water is drawn from by the pump. The

test measures may drain to the sump. The sump capacity should be at least +. times the

capacity of the test measures in order to prevent air from being pumped into the prover.

). ressure 9auge; A calibrated pressure gauge( accurate to within or - + psi from <ero to the

ma?imum pumping pressure( is used to determine the waterdraw system pressure which is

measured at the waterdraw test stand.

).4 &alibrated or Verified Thermometers; &alibrated or verified thermometers( with discriminations

of ,.+ degrees 1 and scale increments of ,.) degrees 1( and traceable to an 7!%T certified

thermometer( are used to measure the water temperature of the water



.



PROVERS

in the field standard test measure and the prover. 5egarding the prover temperature( only the

prover outlet temperature( ta=ing near the beginning of any given calibration pass( is used in

the calculation of Base rover Volume( but the inlet temperature might also be monitored in

order to determine the relative stability of the temperature across the system. %ee A! $$%

&hapter 3 for information on the proper use of thermometers.

).3 !nterconnecting :oses or iping; This piping can be either hoses or pipe that connect the water

draw system to the inlet and outlet of the prover. !f hoses are used they should be of a rigid

type that does not collapse under vacuum( and they should be protected from being steppedon( driven over( or even moved during any waterdraw calibration pass. Waterdraw hoses and

piping between the prover outlet and the waterdraw stand must be completely free of lea=s.

).C %top watch or wristwatch with second counter; The stop watch should be verified prior to use. !t

is used to measure the prescribed drain time( which is that time between the cessation of the

main flow while the field standard test measure is being emptied and the closing of the drain

valve in a bottom drain type measure#.

@., reparation

@.+ !f the prover has previously been in service( it must be thoroughly cleaned of product

prior to hoo=-up of test stand apparatus. %everal flushing e?ercises may be necessary

with clean diesel fuel or suds-less detergent mi?ed with fresh water followed by fresh

water rinsing. !t is essential that no hydrocarbon liquids be present in the prover or in

any au?iliary piping that is under pressure during the waterdraw calibration. The prover

must be completely isolated from upstream and downstream piping by means of

bubble tight double bloc= and bleed valves and>or blinds.





PROVERS

@.) 7o crude( refined products or sudsy agents should remain in the prover or test stand apparatus duringthe Waterdraw. !nspect prover internals for damage or foreign material.

@.@ Visually inspect each test measure to verify no dents or other damage has occurred which might affec

the test measure volume. &hec= also to assure no foreign obDects are inside the measure. Verify that

the internal surfaces of the test measure are clean and free of any residual buildup. 1oreign material

can displace liquid and also change the drain down characteristics of the test measure.

@.' Verify that all test measure 7!%T seals and tags are intact.

@. When the test measure is full( verify that there are no lea=s around the sight glass and the bottom drain

valve.

@.4 *evel the test stand at a 2, by 2, and all the test measures at a 2, by 2, using a torpedo level.

@.3 !f a prover sphere displacer is used( the sphere must be inflated to provide a lea

proof seal against the inside diameter of the prover piping. !t is essential that a

air inside the sphere be vented. /nless otherwise specified by custom

specifications( sphere over inflation shall not e?ceed +,E. The following over

inflation percentages are suggested;

4" through +)" %pheres @E to 'E ma?

+4 F %pheres @.E to 'E ma?.

)," through )'" %pheres 'E

@," %pheres E

@4" through ')" %pheres 4-CE




UNIDIRECTIONAL MECHANICAL DISPLACEMENT METERPROVERS

@.C !f a sphere type displacer is used( visually inspect the sphere for splits( cuts( lea=s( and other

defects( which might affect prover performance. &hec= for lea=age from the inflation plug.

5eplace spheres that are damaged( defective or lea=ing. $easure the diameter in two

perpendicular planes to determine relative roundness.

@.2 !f a piston displacer is used( visually inspect the seals for cuts( tears( wear( etc. which might

affect the prover performance. 5eplace the seals if necessary. Visually inspect prover

barrel for damage or foreign material.

@.+, rior to inserting the displacer into the prover( it may be coated thoroughly with a thin coating of

a water resistance lubricant. ?cessive lubricant should be avoided so that the test

measures do not become coated. &are should be e?ercised to prevent dirt and other

foreign material from entering the prover.

@.++ &onnect the waterdraw test stand interconnecting hoses to the prover. This may be done at the

prover '-way valve( special waterdraw connections or other convenient upstream and

downstream connections. !n the case of a unidirectional prover( a small au?iliary '-way

may be used to assist in positioning the displacer near the first detector for a calibrationpass. !n that case( the au?iliary '-way valve would be hoo=ed up with its inlet connected to

the pump discharge( its outlet connected to the inlet to the waterdraw test stand( and the

other two ports connected to the prover launching chambers. An au?iliary '-way valve can

also be used to good advantage( when calibrating unidirectional provers( to position the

displacer near the first detector in the same way as done with a bi-directional prover



WATERDRAW CALIBRATION FOR BI-DIRECTIONAL ANDUNIDIRECTIONAL MECHANICAL DISPLACEMENT METER

PROVERS

@.+) 1ill the prover( interconnecting hoses and waterdraw test stand reservoir with fresh de-aerated wate

0uring filling all high point vents must be open until all air is evacuated. &hec= entire system for lea=and correct if necessary. Verify that the hoses( valves( etc. are in a position or barricaded to preven

movement( tampering or being stepped on during a measured run. This can prevent erroneous data.

@.+@ &onnect power supply to the test stand and to the water circulation pump.

@.+' &onnect two detector cables to the waterdraw test stand. !dentify which cable lights up the "A

actuation light on the control panel when the cable is shorted at the other end and label that cable a

the "A" detector cable. !dentify which cable

lights up the "B" actuation light on the control panel when the cable is shorted at

the other end and label that cable as the "B" detector cable. Verify that the

solenoid valve is operational for both cables. &onnect the assigned detector that

is closer to the :8$-position launching chamber to the "A" detector cable and

consider that detector to be Detector A for this calibration. &onnect the assigned

detector that is closer to the AWAG-position launching chamber to the "B"

detector cable and consider that detector to be 0etector B for this calibrate

@.+ Turn the pump on to pressure up the system( and slowly open the inlet and outlet

prover valves so that the entire prover system( up to the waterdraw test stand( isfilled and under pressure. Vent all high points in the prover system until any air is

displaced.

PROVERS

'., &alibration Trial 5uns

'.+ The trial runs serve several purposes;

6 Aid determination of si<e and number of measures

6 Wets down measures

6 ermits evacuation of airH and

6 Allows operators to "practice"

'.) 0etermine the number and si<e of test measures to be used during any given pass of

the displacer for prover calibration. To ma=e this determination( the appro?imate prover

volume must be =nown. The appro?imate volume can be obtained from the previous

calibration certification( engineering drawings or by calculation. The number and si<e of

test measures should be selected from those available to minimi<e the number of test

measure filling draws# and to =eep the displacer moving steadily as much as possible.

'.@ With the prover '-way valve in the REVERSE position( open the waterdraw test stand

discharge to reservoir valve to begin circulating water through the entire prover and

waterdraw test stand system. This will =eep the displacer in the :8$-position

launching chamber. The HOME position is normally on the right( when standing away

from the prover( at the launching chamber end of the prover.

'.' &lose the discharge to reservoir valve. Vent all high points in the entire prover and

waterdraw test stand system to displace any air in the system. 8pen the solenoid

isolation valve to allow water to pass through the solenoid valve for a time. Then close

the solenoid isolation valve. With the test measure bottom drain valves open( open all

the test measure filling valves briefly to displace any air





PROVERS

trapped in the filling valve cavities. Then close the bottom drain valves on all the test measures.

&hec= the entire system for e?ternal and internal lea=s.

'. &ycle the '-way valve to the 185WA50 position and vent the double bloc= and bleed to chec=

for seal. 8pen the discharge to reservoir valve so that the displacer will begin moving toward

Detector A in the OUT direction. When the displacer passes Detector A, the actuation light

on the control panel( for that detector( will be turned on briefly while the switch maintains

contact. Allow the flow to continue towards Detector B on this pass. When the displacer

passes Detector B, the actuation light on the control panel( for that detector( will be turned on

briefly while the switch maintains contact. &ontinue the circulation until the displacer has had

time to reach the AWAG-position launching chamber. When the displacer has reached the AWAG-position launching chamber( close the discharge to reservoir valve and vent all high

points in the system. &hec= all valves and connections for e?ternal and internal lea=s. 8pen

the discharge to reservoir valve to allow circulation for temperature stability.

'.4 &ycle the '-way valve to the REVERSE position and vent the double bloc= and bleed to chec=

for seal. 8pen the discharge to reservoir valve so that the displacer will begin moving toward

Detector B i the BAC! direction. When the displacer passes Detector B, the actuation light

on the control panel( for that detector( will be turned on briefly while the switch maintains

contact. Allow the flow to continue towards Detector A on this pass. When the displacerpasses Detector A, the actuation light on the control panel( for that detector( will be turned on

briefly while the switch maintains contact. &ontinue the circulation until the displacer has had

time to reach the :8$-position launching chamber. When the displacer has reached the

:8$-position launching chamber( close the discharge to reservoir valve and vent all high

points in the system. &hec= all





valves and connections for e?ternal and internal lea=s. 8pen the discharge to reservoir valve to

allow circulation for temperature stability.

'.3 5epeat %teps '. and '.4 until there is no sign of air in the system. Air must be purged at all

high points not Dust the highest point# including those in any au?iliary piping or "dead legs"

that are under pressure during the waterdraw calibration.

"#$ Co%&cti' t(e OUT Pass) &ycle the '-way valve to the FORWARD position. 8pen the

discharge to reservoir valve so that the displacer will begin moving toward Detector A in the

OUT direction. When the displacer passes Detector A, the actuation light on the control panel(

for that detector( will be turned on briefly while the switch maintains contact. Allow the flow to

continue until the actuation light turns off( and shortly thereafter close the discharge to

reservoir valve. &ycle the '-way valve to the REVERSE position. 8pen the discharge to

reservoir valve so the displacer will begin moving towards Detector A i the BAC! direction.

When the displacer passes Detector A, the actuation light on the control panel( for that

detector( will be turned on briefly while the switch maintains contact. Allow the flow to continue

until the actuation light turns off( and shortly thereafter close the discharge to reservoir valve.

&ycle the '-way valve to the FORWARD position and vent the double bloc= and bleed to

chec= for seal. 8pen the solenoid isolation valve to allow water to flow through the tubing into

the reservoir. When Detector A is actuated the solenoid valve closes( the flow is therefore

stopped and the displacer is at the leading edge of the prover section to be calibrated. &lose

the solenoid to reservoir isolation valve. 1illing and draining the test measures can now

commence. When the displacer gets near to Detector B, open the solenoid tubing valve that is

overhead the last test measure being filled for this calibration pass. As the water level gets

near the top nec= of this test measure( the larger filling valve will be slowly closed until all the

flow into the test

WATERDRAW CALIBRATION FOR BI-DIRECTIONAL ANDUNIDIRECTIONAL MECHANICAL DISPLACEMENT METER

PROVERS

measure is going through the solenoid tubing valve. The flow will stop automatically when the

displacer actuates Detector B# &lose the solenoid tubing valve while the last test measure

stabili<es( and open the main circulation valve to allow the displacer to travel to the AWAG-

position launching chamber while reading the liquid level of the last test measure and

determining its temperature. This completes the 8/T pass. When the displacer has reached

the AWA*-position launching chamber( close the discharge to reservoir valve and vent all

high points in the system. &hec= all valves and connections for e?ternal and internal lea=s.

8pen the discharge to reservoir valve to allow circulation for temperature stability.

'.2 Co%&cti' t(e BAC! Pass) &ycle the '-way valve to the REVERSE position. 8pen the

discharge to reservoir valve so that the displacer will begin moving toward Detector B i the

BAC! direction. When the displacer passes Detector B, the actuation light on the control

panel( for that detector( will be turned on briefly while the switch maintains contact. Allow the

flow to continue until the actuation light turns off( and shortly thereafter close the discharge to

reservoir valve. &ycle the '-way valve to the FORWARD position. 8pen the discharge to

reservoir valve so the displacer will begin moving towards Detector B in the OUT direction.

When the displacer passes Detector B, the actuation light on the control panel( for that

detector( will be turned on briefly while the switch maintains contact. Allow the flow to continue

until the actuation light turns off( and shortly thereafter close the discharge to reservoir valve.

&ycle the '-way valve to the REVERSE position and vent the double bloc= and bleed to chec=

for seal. 8pen the solenoid isolation valve to allow water to flow through the tubing into the

reservoir. When Detector B is actuated the solenoid valve closes( the flow is therefore

stopped and the displacer is at the leading edge of the prover section to be calibrated. &lose

the solenoid to reservoir isolation valve. 1illing and draining

the test measures can now commence. When the displacer gets near to Detector A, open the

solenoid tubing valve that is overhead the last test measure being filled for this calibration

pass. As the water level gets near the top nec= of this test measure( the larger filling valve will

be slowly closed until all the flow into the test measure is going through the solenoid tubing

valve. The flow will stop automatically when the displacer actuates Detector A# &lose the

solenoid tubing valve while the last test measure stabili<es( and open the main circulation

valve to allow the displacer to travel to the :8$-position launching chamber while reading

the liquid level of the last test measure and determining its temperature. This completes the

BAC! pass. When the displacer has reached the HOME-position launching chamber( close

the discharge to reservoir valve and vent all high points in the system. &hec= all valves and

connections for e?ternal and internal lea=s. 8pen the discharge to reservoir valve to allow

circulation for temperature stability.

'.+, 1illing and draining the test measures; 8pen the filling valve for the first test measure to be

filled. When it is almost full( begin filling a second measure if possible while slowly closing the

filling valve for the first measure. When the first test measure is full and its filling valve closed(

verify that the test measure itself is level. When the liquid level has stabili<ed( read and record

the liquid level in the test measure at a plane level with the bottom of the meniscus. Then drain

the measure in the prescribed manner while continuing to fill the second measure. 8nce the

bottom drain valve has been closed at the end of the prescribed drain time( it is available for re-

filling as needed. Alternate between the first and second measure or some other combination

in such a way as to =eep the displacer moving as much of the time as possible at a steady flow

rate until near the second detector for this pass. !f it is necessary to stop the flow e.g.(

calibrating a prover with a single pass volume of +,, gallons with one ,,-gallon test

measure#( do

PROVERS

so smoothly but decisively. 0o not slow to a tric=le at any time e?cept when approaching the detector

through the solenoid valve. 7ormally( the larger of the test measures would be used for both

starting and ending a calibration pass.

'.++ The sca+e icreets for reading a test measure gauge glass are different according to the

test measure si<e. 7ormally( test measure increments are as follows;

6 ,,-9allon Test $easure; ) &ubic !nches 5ead to nearest ., &u. !n.#

6 ),,-9allon Test $easure; +, &ubic !nches 5ead to nearest )., &u. !n.#

6 +,,-9allon Test $easure; &ubic !nches 5ead to nearest +., &u. !n.#

6 ,-9allon Test $easure; ) &ubic !nches 5ead to nearest ,. &u. !n.#

6 @,-9allon Test $easure; ) &ubic !nches 5ead to nearest ,. &u. !n.#

6 +,-9allon Test $easure; + &ubic !nch 5ead to nearest ,.) &u. !n.#

6 -9allon Test $easure + &ubic !nch 5ead to nearest ,.) &u. !n.#

6 +-9allon Test $easure; + &ubic !nch 5ead to nearest ,.) &u. !n.#

'.+) 0etermining the prover pressure; While flow is going only through the solenoid valve and the

displacer is approaching the first detector for any given calibration pass( read and record the

starting prover pressure using the pressure gauge on the waterdraw calibration stand. 5ead

the pressure to the nearest whole + psig.

'.+@ 0etermining the prover temperature; 1or each calibration pass( read and record the prover

temperature at the beginning of the pass. This means that the temperature is to read after it

has stabili<ed but before the displacer has gone +>@ of the way to the second detector for the

pass. The temperature is to be read on the downstream side of the prover using a thermowell

appropriate to the

PROVERS

dimensions of the pipe and the thermometer. 5ead the temperature to the nearest ,.+ degrees 1.

'.+' Verifying that the test measure is level; !t is necessary that the test measures be level wheneverfull and at the time of reading the liquid level. !nitially this can be done with a machinist type

spirit level across the nec= of the test measure( in two hori<ontal directions that are 2,

degrees apart. *evels attached permanently on the test measure can be used for the same

purpose once it is verified that they agree with the level across the nec= or they have 7!%T

seals intact.

'.+ 0etermining the test measure temperature; 5ead and record the measure temperature either by

immersion into the measure before draining the measure( or by immersion into the discharge

stream while draining the measure. A cup case is normally used for either method. When

determining the temperature of a measure that does not have a bottom drain valve( the

thermometer is immersed halfway into the test measure. This done after the liquid level is read

but before the draining has begun( while stirring slightly( and held long enough to stabili<e

before removing and reading the temperature. When determining the temperature of a

measure that does have a bottom drain valve( the thermometer is immersed into the flowing

discharge water( while draining the measure( and held long enough to stabili<e before

removing and reading the temperature. 5ead the temperature to the nearest ,.+ degrees 1. To

maintain the thermometer closer to water temperature( it should be =ept in a buc=et of water

between readings.

'.+4 &alibration 1low 5ate; The calibration flow rate for each ass 5un unidirectional prover# or

5ound Trip 5un bi-directional prover# of the displacer must be changed from the preceding

flow rate by )E or more. 8therwise there is danger





PROVERS

.

of obtaining an erroneous volume( even though all the runs repeated( because of

an undiscovered lea=. A rate change can be easily accomplished by adDusting the

test measureIs filling valve. 8nce a flow rate has been established( the pressure

should be noted so that the flow rate can be easily reproduced. 1or e?ample( it

might wor= out that a flow rate of 4, 9$ could be achieved while filling the ,,-

gallon measure by setting the test stand pressure at psig. !t might also wor= out

that a flow rate of ', 9$ could be achieved while filling a ,,-gallon measure(

by setting the test stand pressure at @, psig. This can only be determined by

e?periment at the time of calibration. 5ead and record the time of the filling of the

largest test measure for each pass. J

'.+4.+ Atypical waterdraw might have the following flow rate pattern;

5ound Trip 7o. + 4, gallons per minute

5ound Trip 7o. ) ', gallons per minute representing a change of @@E#

5ound Trip 7o. @ 4, gallons per minute representing a change of ,E#

8r;

5ound Trip 7o. + ', gallons per minute

5ound Trip 7o. ) 4, gallons per minute representing a change of ,E#

5ound Trip 7o. @ ', gallons per minute representing a change of @@E#

'.+4.) The calibration flow rate for any given run should remain as constant as possible. !t may be

determined by one of the following methods;

6 0etermining the time to fill the largest test measure most practical#

6 0etermining the total time to fill all the measures

6 0etermining the time from detector to detector flow must not be interrupted#

6 0etermining the flow rate by means of a flow or flow rate meter.

PROVERS

$inimi<ing NEC! DRAWS and PRE-FILLS) After one or more round trips( it may be evident that fil ling the

measures to "<ero" on the nec= scale is not wor=ing out so well. !n other words( the final test

measure filled in a given pass might automatically stop before the liquid level gets high

enough in the nec= to be read. 8n the other hand( the liquid level might e?ceed the capacity

of the last test measure. To further complicate matters( the optimum liquid levels in one

direction might not agree with the optimum liquid levels in the other direction. Therefore( the

volumes in each direction from the trial calibration runs must be considered when deciding how

high in the nec= to fill the test measures in the OUT and BAC! passes. After one or more trial

runs( the operator may wish to adDust the fill levels above or below the <ero mar= on the nec=

scale to avoid a NEC! DRAW or a PRE-FILL situation.

'.+3.+ NEC! DRAW) There is a possibility that on the last test measure drawn( the solenoid valve will

close before the water level has reached the readable portion of the scale on the test

measure nec=. !n that case( a NEC! DRAW from the ne?t to the last measure filled might be

required. That is why it is important to never empty the ne?t to last measure for any given

calibration-pass until a close appro?imation of the pass volume is =nown. *eave it full of water.

There is a drain coc= below the scale on the nec= of the larger test measures ,,( ),,( +,,(

,( and @, gallon# where water can be removed in a controlled manner from the nec=. 1or

e?ample( the ending test measure might need only +,, cubic inches to reach a readable level

in its nec=. !f the ne?t to last test measure is full( and has more than +,, cubic inches in the

readable portion of the nec=( then +,, cubic inches can be transferred from the full measure to

the almost full measure. When doing this( care must be

ta=en to wet the transfer container and drain it in the prescribed manner both before receiving the

water and in transferring the water to the ending test measure. The transfer container

should be either a small test measure or a smooth plastic container which drains almost

dry. Whatever quantity is necessary to be added to the ending test measure( in order to

ma=e a final reading( must be mathematically deducted when performing the calculations

for that pass. !f the flow has not stopped before the ending test measure reaches it

ma?imum readable capacity( a different type of NEC! DRAW might be required. 1irst the

liquid level is read in the ending test measure to account for the water accumulated to that

point. Then the water level is drawn down to a low readable level. The liquid level is read

and recorded and the water is allowed( again( to flow through the solenoid into this ending

test measure. The flow is stopped manually if it reaches a high point in the nec=. Thus if the

starting level were -+,, cubic inches and the stopping level were +,, cubic inches( the

amount of additional water would be ),, cubic inches. This process is repeated until an

automatic stop is obtained through the detector actuation of the solenoid valve.

'.+3.) PRE-FILL) Trial runs may indicate the need for a PRE-FILL so that the ending test measure

will have enough water in the nec= to be read. This is accomplished by filling a -gallon

measure( directly from the sump reservoir( to the <ero mar= on the scale( and emptying it

into one of the other test measures. The PRE-FILL would be deducted from the total cubic

inches for that pass. !f at the end of a trial run it becomes obvious that at least gallons

additional water is needed( that would become the basis for ma=ing a PRE-FILL of gallons

at the beginning of subsequent passes. 8ften the first trial run has to be measured with a

combination of a NEC! DRAW and an after the fact PRE-FILL in order to get a

measurement for that pass.

., &alibration 8utline

.+ The wor= sheet sample( age @,( rover &alibration 5eport 1ield Wor= %heet( should

be used to record equipment specifics and raw test data. The following is a list of

information to be recorded either at the start of the calibration as =nown# or during the

calibration as obtained#;

6 %heet of

6 0ate of &alibration

6 Time at start of calibration pass

6 Weather at time of calibration pass

6 &ertificate 7o.KKKKKK

6 &ustomer 7ame

6 Lob 7umber or $.8. 7umber

6 rover; %erial 7umber

6 Test *ocation

6 rover; %i<e

6 rover; $aterial usually mild carbon steel#

6 rover; Wall Thic=ness WT# in inches

6 rover; !nside 0iameter !0# in inches

6 rover; 5eference temperature Tb#

6 rover; $odulus of lasticity usually @,(,,,(,,, for mile carbon steel#

6 rover; &ubical coefficient of thermal e?pansion usually ,.,,,,+C4 per degree 1#6 rover; 0isplacer %i<e and>or E of !0 of pipe e.g.( +,'E#

6 rover; 0etector *ocations and Tag 7umbers





PROVERS

6 Test $easure; 5eference 7umber to cross reference to 7!%T %eal 7umber and B$V

6 Test $easure; 7!%T %eal 7umber

6 Test $easure; Base $easure Volume B$V# in /.%. 9allons nominal and appro?imate#

6 Test $easure; Base $easure Volume B$V# in &ubic !nches as reported on 7!%T 5eport#

6 Test $easure; $aterial usually stainless steel#

6 Test $easure; &ubical &oefficient of thermal e?pansion usually ,.,,,,)4 per degree 1#

6 Test $easure; 5eference Temperature Tb for the test measure#

6 %erial 7umber; rover inlet pressure gauge optional - 78T used for calculations#

6 %erial 7umber; rover outlet pressure gaugeoptional - 78T used for calculations#

6 %erial 7umber; rover inlet thermometer optional - 78T used for calculations#

6 %erial 7umber; rover outlet thermometer mandatory - used for calculation of BV#

6 %erial 7umber; Test stand thermometer mandatory - used for calculation of BV#

6 %erial 7umber; Test stand pressure gauge mandatory - used for calculation of BV#

6 ass 0ata; ass 7umber

6 ass 0ata; 0irection

6 ass 0ata; rover ressure p# in psig as displacer approaches first detector

6 ass 0ata; rover Temperature Tp# in degrees 1 at beginning of calibration pass

6 ass 0ata; *argest test measure fill time for flow rate calculation for this pass

6 ass 0ata; &alculated 1low 5ate 9$#

6 ass 0ata; 5eference number identifying which test measure is being filled

6 ass 0ata; %cale 5eading %5# in the # column

6 ass 0ata; %cale 5eading %5# in the -# column

PROVERS

.

6 ass 0ata; AdDusted Base $easure Volume B$Va# Only for manual

calculations

• ass 0ata; Test $easure Temperature Ttm#

6 ass 0ata; &T0W correction factor Only for manual calculations

• ass 0ata; &&T% correction factor Only for manual calculations

• ass 0ata; W0<( &%p( &*p and W0<b Only for manual calculations

6 Witness signature lines

.) 8utline of %teps for a Bi-directional rover

+. 5econfirm all air has been vented and there are no lea=s.

). &ontinue circulating until temperature is reasonably stable.

@. 5econfirm all test measures have Dust been filled drained as prescribed.

'. /se %teps '.C and '.+, through '.+4.) to conduct the 8/T passes.

. /se %teps '.2 and '.+, through '.+4.) to conduct the BAC! passes.

4. &onduct the +st 8/T pass at the designated 1A%T flow rate.

3. &onduct the +st BAC! pass at the designated 1A%T flow rate.

C. &onduct the )nd 8/T pass at the designated SLOW flow rate.

2. &onduct the )nd BAC! pass at the designated %*8W low rate.

+,. &onduct the @rd OUT pass at the designated FAST flow rate.

++. &onduct the @rd BAC! pass at the designated FAST flow rate.

+). valuate the results and continue if necessary more runs > trouble shooting#.

.@ %pecial notes for unidirectional provers

6 Air must be vented while the sphere-handling device is in the oe position.

6 Air must be vented while the sphere-handling device is in the c+ose% position.

6 All passes are from Detector A to Detector B#





PROVERS

6 The sphere handling interchange must be chec=ed for seal each time the sphere displacer is launched.

6 The au?iliary '-way valve is always in the FORWARD position e?cept when positioning the spheredisplacer at Detector A#

6 !f an au?iliary '-way valve is not available( positioning the sphere at Detector A requires timing the sphere

travel from launching chamber to first detector on trial runs. That way the discharge to

reservoir valve can be closed Dust before reaching the first detector on an actual calibration

run. Then the flowing stream is put in the control of the solenoid for the actuation of 0etector

A Dust as in a bi-directional prover.

.' 8utline of %teps for a /nidirectional rover

+. 5econfirm all air has been vented and that there are no lea=s.

). &ontinue circulating until the temperature is reasonably stable.

@. 5econfirm all test measures have Dust been filled and drained as prescribed.

'. Verify that au?iliary '-way valve to FORWARD position.

. *aunch the sphere displacer through the sphere handling interchange.

4. &hec= for seal in the sphere handling interchange.

3. erform %tep '.C e?cept that '-way valve is already in FORWARD position.

C. erform %teps '.+, through '.+4.) to conduct the 8/T passes.

2. &onduct the .st OUT pass at the designated FAST flow rate.

+,. &onduct the )nd 8/T pass at the designated SLOW flow rate.

++. &onduct the @rd 8/T pass at the designated FAST flow rate.

+). valuate the results and continue if necessary more runs > trouble shooting#.

. 5epeatability criteria for Bi-directional provers; 1or a bi-directional prover( a ROUND TRIP means the same

as a RUN# A ROUND TRIP volume of a bi-directional prover is the sum of two displaced pass

volumes in opposite





PROVERS

directions i.e. 8/T plus BAC! equals ROUND TRIP/# !t is not required that these pass volumes be

equal( but all the consecutive 8/T passes must be within a range of ,.,)E( and all the

consecutive BAC! passes must be a range of ,.,)E. 1inally( all the consecutive

ROUND TRIP RUNS, that are made up of the unbro=en measured chain of OUT and

BAC! passes must be within a range of ,.,)E. The following will illustrate;

8/T ass 7o. +versus 8/T ass 7o. @ within a range of ,.,)E

OUT ass 7o. @versus 8/T ass 7o. within a range of ,.,)E

8/T ass 7o. versus 8/T ass 7o. + within a range of ,.,)E

BAC! ass 7o. ) versus BAC! ass 7o. ' within a range of ,.,)E

BAC! ass 7o. ' versus BAC! ass 7o. 4 within a range of ,.,)E

BAC! ass 7o. 4 versus BAC! ass 7o. ) within a range of ,.,)E

ROUND TRIP !versus ROUND TRIP !! within a range of ,.,)E

ROUND TRIP !! versus ROUND TRIP !!! within a range of ,.,)E

ROUND TRIP !!! versus ROUND TRIP ! within a range of ,.,)E

.4 5epeatability criteria for /nidirectional provers; 1or a unidirectional prover( a single one-way

PASS means the same as a 5/7. A unidirectional prover measures in only one

direction so it has only 8/T passes or 5/7>A%% volumes. 1or a unidirectional

prover( all the consecutive 8/T passes must be within a range of ,.,)E. Thefollowing will illustrate;

8/T ass 7o. +versus 8/T ass 7o. @ within a range of ,.,)E

8/T ass 7o. @versus 8/T ass 7o. within a range of ,.,)E

8/T ass 7o. versus 8/T ass 7o. + within a range of ,.,)E

.3 &alculation of range percent; M$ANimum- $!7imum#> $!7imum#O ? M+ ,,O





PROVERS

!f the above calculation results in ,.,)E or less( the repeatability criteria has been met.

4., &alculation of Base rover Volume BV#; The calculations for the new Base rover Volume BV# can

be done manually using a scientific calculator or by a computer that uses the Waterdraw

calibration program. &alculations must be done per A! $anual of etroleum $easurement

%tandards &hapter +) %ection )( art '( &alculation of Base rover Volumes by the Waterdraw

$ethod( +st dition( $arch ),,+.

4.+ &alculation of AdDusted Base $easure Volume B$Va#; B$V is always entered e?actly as the "to

deliver" volume is stated on the 7!%T 5eport of &alibration. Add the scale reading according to

sign or -# of liquid level in test measure to the B$V for B$Va for each fill.

4.) &alculation of &T0W; Water temperature correction between the starting prover temperature and

each test measure temperature is made using the table in A! &hapter ++.).@. To locate the

figures in the A! &hapter;

6 !f the temperature of the measure is lower than the prover starting temperature( use the first half

of the table in A! &hapter ++.).@.

6 !f the temperature of the measure is higher than the prover starting temperature( use the second

half of the table in A! &hapter ++.).@.

6 An e?ample of this correction is as follows;

rover starting temperature 4.+P1

Test $easure temperature 4.'P1

&orrection 1actor ,.22224C &T0W is in 4 decimals

4.@ &alculation of &orrection for Temperature of the %teel in the rover &T%p#





PROVERS

/sing only the starting prover temperature of the prover for a given pass( calculate &T%p in the

following manner;

&T%p Q + Tp - Tb# ? 9c# 5ound &T%p to 4 decimal places

Where;

Tp Q %tarting prover temperature 7ote; 8ne +# &T%p per pass

Tb Q Base or reference temperature for the prover

9c Q &ubical coefficient of thermal e?pansion for the prover

$ost of the carbon steel provers have a 9c of ,.,,,,+C4 per deg. 1

4.' &alculation of &orrection for Temperature of the %teel in the Test $easure

&T%tm# 1or each fill of a test measure( calculate its &T%tm in the following

manner;

&T%tm Q + Ttm - Tb# ? 9em#

Where; 5ound &T%tm to 4 decimal places

Ttm Q Temperature of test measureTb Q Base or reference temperature for the test measure

9em Q &ubical coefficient of thermal e?pansion for the measure

$ost of the test measures have a 9em of ,.,,,,)4 per deg. 1

4. &alculation of &ombined &orrection for the Temperature of the %teel &&T%#

1or each fill of a test measure( calculate the &&T% in the following manner;

&&T% Q &T%tm > &T%p 5ound &&T% to 4 decimal places

4.4 &alculation of each measure fill W0# after correcting for steel and liquid temperatures





1or each measure fill( calculate W0( which is B$Va corrected for the difference in

temperatures( difference in materials( and possible difference in reference temperatures(

between the prover and the test measure. ach measure fill is calculated in the following

mannerK

W0 Q B$Va ? &T0W ? &&T% 5ound W0 to ' decimal places

4.3 &alculation of the &orrection for ressure on the %teel of the rover &%p# 1or

each pass of the displacer( calculate &%p in the following manner;

&%p Q + p ? !0# > ? WT# 5ound &%p to 4 decimal places

Where;

p Q rover pressure measured at test stand at solenoid flow rate#

!0 Q !nside diameter of prover pipe in inches

WT Q Wall thic=ness of prover pipe inches

Q $odulus of lasticity Q @,(,,,(,,, per psi

4.C &alculation of the &orrection for ressure on the *iquid in the rover &*p#

1or each pass of the displace( calculation &*p in the following manner;

&*p Q + # > + - 1p ? p# 5ound &*p to 4 decimal places

Where;

p R rover pressure measured at test stand at solenoid flow rate#

1 Q &ompressibility 1actor for water in the prover Q ,.,,,,,@)

PROVERS

4H2 &alculation of W0<

&alculate the sum of W0Is in the following manner;

W0< Q %/$ of all the W0Is in any given pass

4.+, &alculation of W0 &%p ? &*p# 5ound W0<b to ' decimal places

4.++ To wor= in other materials prover and measure#( degrees &( bars and millimeters( see Tables

+ through C in A! &hapter +).)( art '( &alculation of Base rover Volumes by the Waterdraw

$ethod. Tables + through C provide the necessary discrimination levels and constants for

calculating BV. A discussion of volume conversions is found in +).)( art '( aragraph

+).+..

4.+) &alculation of BV in cubic inches; MW0<b+# W0<b)# W0<b@#O >M @O

Ro&% BPV to " %eci,a+ +aces

4.+@ &alculation of BV in /.%. 9allons; Average W0 )@+ in@ per /.%. 9allon

Ro&% BPV to 0 si'i1icat %i'its

4.+' &alculation of BV in Barrels; Average W0 23,) in@ per Barrel

!f $85 than +,, barrels; Ro&% BPV to " %eci,a+ +aces

PROVERS

!f *%% than +,, barrels; 5ound BV to 4 significant digits

4.+ &alculation of BV in &ubic 1eet; Average W0 +3)C in@ per&u. 1t.

Ro&% BPV to 0 si'i1icat %i'its

4.+4 &alculation of BV in *iters and &ubic $eters at another reference temperature

6 Above volumes are at a reference temperature for the prover( Tb in 0%& units

6 !n this e?ample assume that Tb for above 0%& volumes is 4, degrees 1

6 !n this e?ample assume that Tb for *ites and &ubic $eters is + degrees &

6 &onvert + degrees & to 2 degrees 1; +& ? +.C# @)1# Q 2 1

6 &alculate &T%p for *iters and &ubic $eters;

&T%p Q + B "21-4,1#? ",.,,,,+C4# Q +.,,,,+C4 ?ception; !n this

special case( &T%p is a 3 decimal correction factor.

6 &alculate BV in cubic inches at 4, degrees 1 to *iters at 2 degrees 1 *iters at +

degrees & Q Average W0 +,,, ? +.,,,,+C4# Ro&% to 0

si'i1icat %i'its

&alculate BV in *iters at + degrees & to &ubic $eters at + degrees & &ubic

$eters at + degrees & Q *iters at + degrees &# > +,,,# Reort to 0

si'i1icat %i'its %ame digits as for *iters but decimal place has moved.

?ample; '4.@'' *iters converts to ,.,'4@'' cubic meters

3., 0ocumentation and &ertification

3.+ The following documents are generated or assembled as a result of a prover Waterdraw;

6 Test $easure &ertification

6 Thermometer &ertification traceable to a nationally recogni<ed standard i.e. 7!%T#

6 ressure 9auge &ertification traceable to a nationally recogni<ed standard i.e. 7!%T#

PROVERS

6 rover &alibration 5eports Wor= %heets#

6 $anual or &omputer generated calculations. H .

6 rover &alibration 5eport.

3.) ach prover calibration is issued a unique &ertificate 7umber normally sequentially derived from

a $aster *og maintained by 0ocumentation &ler=. The $aster *og identifies;

6 Waterdraw 0ate

6 &ertificate 7umber

6 rover %erial 7umber

6 &ustomer

6 $anufacturer of '-Way Valve

6 *ocation

6 roDect 7ame

6 rover %i<e

6 Lob 7umber

3.@ The prover Waterdraw certificate volume must be chec=ed for conformance to the design

requirements as shown on the system specification sheet and prover drawing. This chec= is to

be done by the roDect $anager or his designee as indicated by their signature on the

Waterdraw certificate.

PROVERS

Water0raws( **&

)@ Arthur Ave. *a=e

Arthur *A. 3,'2

PROVER CALIBRATION REPORT

FIELD WOR! SHEET

&ustomer $.8. 7o. %erial 7o.Test *ocation rover %i<e $aterial

rover; Wall Thic=ness WT# inches !nside 0iameter !0#

rover; 5eference Temp. Tb# degree 1 rover;

&ubical coefficient 9c# per degree 1K rover;

0etector *ocations and Tag 7umbers

Test $eas. 5ef. S + ) @ ' 4

7!%T%eal7o.Vol. !n /.%. 9alsVol. in &u. !nches

$aterial of $eas.

&oefficient 9em

5ef. Temp. TbSERIAL NUMBERS

Thermometer; rover 8utlet K

Thermometer; W0 Test %tand

RUN DATA ass 7o.KKKK 0irection

. ress( psig#

&alculated 1low 5ate 9$#.BMVa Te CTDW

1

2

3

4

5

of %heet0ateK Time Weather

&ertificate 7o.

K$odulus of lasticity #K

K0isplacer %i<eE#KKK

ressure 9auge;KKKKKKKKKKKK solenoid

flow - approaching +st detector#

.Temp.

st $easure 1ill TimeK CCTS WDFi++ Re1# SR SR-

waterdraw calibration for bi-directional and unidirectional mechanical displacement meter provers

Documents