aga 3 -2000 revision

EFFECTS OFAPRIL 2000

REVISION OFAPI 14.3 PART 2

ORIFICE METERTUBES

CHANGES TO API 14.3 - APRIL 2000CHANGES TO API 14.3 - APRIL 2000

INTERNAL SURFACE FINISH

UPSTREAM LENGTH

STRAIGHTENING VANES

FLOW CONDITIONERS

8” PLATE THICKNESS

THERMOWELL LOCATION

STAGGERED TAPS

P LEAD LINES

INCREASED DIFFERENTIAL

GRANDFATHER CLAUSE

INTERNAL FINISHINTERNAL FINISH

WAS 250 MICROINCH THROUGHOUT

CHANGES TO API 14.3 - APRIL 2000

•NOW SIZE AND BETA DEPENDENT

METER TUBES TO 12” SIZE



METER TUBES 16” & LARGER



THOUGH UNDESIRABLE, ARE NOW ALLOWED,IF THEY DON’T

→EXCEED I.D. TOLERANCE

→EXCEED FINISH REQUIREMENT

PITS


UPSTREAM LENGTH SELECTIONUPSTREAM LENGTH SELECTION

→BARE TUBE ( no vane or conditioner)

→SHORT TUBE WITH VANE

→LONG TUBE WITH VANE

→TUBE WITH CONDITIONER

4 CATEGORIES

CATEGORY ( no vane or conditioner )

NOW IS 145D

UNIVERSAL “CATCH ALL” METER TUBE

CATEGORY Bare Meter Tubes continued,

Shorter Lengths Possible For Specific Installations

CATEGORY Bare Meter Tubes continued,

Shorter Lengths Possible For Specific Installations

→Single 90º Elbow @ .75β ---44D

→(2) 90’s Out of Plane (close coupled) @ .5β --95D

→Concentric Reducer @ .75β --13D

→Tee (used as an elbow-not header) @ .75β --44D

See

detail

CATEGORY

NO VANE OR

CONDITIONER

MAX .46 BETA

CATEGORY SHORT VERSION WITH VANE

UNIVERSAL METER TUBE WITH VANE

SHORT UPSTREAMLENGTH WITH TUBE

BUNDLE

COMPARISON OFOLD AND NEW

REQUIREMENTS

CATEGORY

CATEGORY

Short upstream

with tube bundle

CAREGORY LONG VERSION WITH VANE

MAX .67 BETA

UNIVERSAL METER TUBE WITH VANE

CATEGORY

LONG UPSTREAM

WITH TUBE BUNDLE

LONG UPSTREAMLENGTH WITH TUBE

BUNDLE

COMPARISON OF OLDAND NEW

REQUIREMENTS

CATEGORY

THE METER TUBE LENGTH INFORMATION

CONTAINED IN THIS REVISION WAS BASED ON

THE RESULTS OF ACTUAL FLOW TESTING AT

12 LABS (DOMESTIC AND INTERNATIONAL),

USING BOTH LIQUID AND GAS.



TUBE BUNDLE STRAIGHTENING VANES

19 CONCENTRIC SAME SIZE TUBES

NEW, TIGHTER TOLERANCES



CONCENTRIC PATTERN

HEX PATTERN

NOT ALLOWED


HEX PATTERN


END BANDS

NOT ALLOWED



END BANDS

7 TUBE BUNDLE

NOT ALLOWED



7 TUBE BUNDLE FOR 2” SIZE

FLOW CONDITIONINGFLOW CONDITIONING

FLOW CONDITIONERS

REMOVE SWIRL AND CREATE A NEAR

FULLY DEVELOPED FLOW PROFILE


THE DANIEL PROFILERTM

CONDITIONER PLATE

Profiler™ Installation

METER TUBE WITH PROFILER


Meter tube upstream lengthsand beta ratio limits for usewith all flow conditionersother than the standard tubebundle will be established bythe manufacturer based onrequired testing

(ref. Par. 2.5.5.4 AGA-3/API 14.3 April2000)


THE USE OF FLOWCONDITIONERS MAY ALLOWSHORTER UPSTREAM PIPELENGTHS

BUTA SERIES OF TESTS MUST BE RUNBEFORE OFFERING THE DEVICETO THE MARKET


Disturbance TestsDisturbance Tests

→Good Flow Conditions

→Two 900 Elbows in Perpendicular Planes

→Gate Valve 50% Closed

→High Swirl


Flow Conditioner Qualification Test



•Good Flow Conditions - test evaluating impact of flowconditioner on fully developed velocity profile.

•Install the conditioner in the specified location preceding ameter tube where the installation has been shown to alreadyhave a swirl free, fully developed profile. This proves thedevice has no negative effect on flow.

•Two 900 Elbows in Perpendicular Planes - testing of flowconditioner performance in handling combination of a modestswirl and a non-symmetrical velocity profile.



Gate Valve 50% Closed - test evaluating flow conditionerperformance in strongly non-symmetrical velocity profile



•High Swirl - test assessing flow conditioner performancein flows with high swirl angle (over 250).



Swirl must be reduced to 2º Max

Additional TestsAdditional Tests

– Orifice β ratio: Check swirl test at β=0.40 andβ=0.67

– Reynolds Number Sensitivity: Test at tworanges 10,000 < Re <500,000 and Re > 1MMwith approximately a 7:1 ratio.

– Scaling: Test at two sizes selected from D < 4” and D > 8”



ANY FLOW CONDITIONERCHOSEN SHOULD HAVE TESTDATA SHOWING COMPLIANCEWITH THE TESTING PROGRAMOUTLINED IN AGA/14.3



WAS 12” TO 36” UPSTREAM OF VANE

NOW IS 36” MINIMUM UPSTREAM OF VANE

UPSTREAM THERMOWELL LOCATION

STAGGERED PRESSURE TAPSSTAGGERED PRESSURE TAPS

NOT ALLOWED


STAGGERED PRESSURE TAPS

PLATE THICKNESS CHANGE

→8” SIZE WAS 1/8” THICK

→NOW IS 1/4” THICK


Reason: differential was limited to 150” in an orifice fitting

→Some 1/8” and 1/4”seal/plate assemblies may beinterchangeable in the samefitting, allowing installation ofthe wrong plate in the rightfitting


IMPACT OF 8” PLATE CHANGE TO 1/4” THICK

→Plate carriers and/or seal rings forsome manufacturers’ fittings maybe different for 1/8” and 1/4” thickplates



→Existing installations using1/8” thick plates will requirecareful organization if 1/4”units are added



PLATE THICKNESS CHANGE

→24” SIZE WAS 3/8” THICK

→NOW IS 1/2” THICK


Reason: differential was limited to 150”

DP TAP CONNECTION LINE LENGTHS


→EQUAL LENGTH LINES

→SHORT AS POSSIBLE



DIFFERENTIAL TAP LINE LENGTHDIFFERENTIAL TAP LINE LENGTH

IF RESONANCE OR PULSATION IS SUSPECTED,– CALCULATE PROPER LENGTH USING THESE 5 EQUATIONS BASED ON

PULSATION FREQUENCY (f) AND SPEED OF SOUND IN FLUID (a)

length L = factor x a / (2 B f )

0.25

2.5

5.5

8.5

11.5

THE RESULTING LENGTH NEAREST THAT PREFERRED SHOULD BE USED



INCREASED DIFFERENTIAL PRESSUREINCREASED DIFFERENTIAL PRESSURE

TABLES SHOWING MAXIMUM DP FORRECOMMENDED PLATE THICKNESSES

– 304SS AND 316SS

– TEMPERATURES TO 150ºF (65ºC)

– INSTALLED IN BOTH FITTINGS AND FLANGES• FLANGES ALLOW MUCH HIGHER DIFFERENTIALS


INCREASED DIFFERENTIAL PRESSURES

INCREASED DIFFERENTIAL PRESSURECONTINUEDINCREASED DIFFERENTIAL PRESSURECONTINUED

SOME SIZES ALLOW UP TO 1000” DP

– VALUES BASED ON PLATE DEFLECTION ONLY

– ANY OPERATIONAL EFFECTS ON ORIFICE FITTINGS NOTCONSIDERED

ADDITIONAL TABLES FOR OTHER THAN STANDARD PLATETHICKNESSES IN APPENDIX




POSSIBLEEFFECT OFDIFFERENTIALPRESSURESEXCEEDINGVALUESSHOWN


GRANDFATHER CLAUSE

From API 14.3 Part 2, Par 2.1, April 2000


It is strongly recommended that a copyof the new standard be obtained andread thoroughly as there are manydetails not covered in this presentation

It is strongly recommended that a copyof the new standard be obtained andread thoroughly as there are manydetails not covered in this presentation


THE ENDTHE END


TAP HOLE LOCATION TOLERANCE FROM 14.3

HOW TO MEET 14.3 WITH A 1/4” THICK PLATE IN A FITTINGDRILLED FOR A 1/8” THICK PLATE

4” & LARGER

LIMIT BETA

TO .6

If distance “S” between 2 fittings is 22D or more,only the fitting nearest the orifice is considered

2.6.3.1
