IS 14615-1: Measurement of Fluid Flow by Means of Pressure Differential Devices, Part 1: Orifice Plates, Nozzles and Venturi Tubes Inserted in Circular cross-section conduits running full

85 Pages·1999·7 MB·English

by  Bureau of Indian Standards

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information for citizens to secure access to information under the control of public authorities,
in order to promote transparency and accountability in the working of every public authority,
and whereas the attached publication of the Bureau of Indian Standards is of particular interest
to the public, particularly disadvantaged communities and those engaged in the pursuit of
education and knowledge, the attached public safety standard is made available to promote the
timely dissemination of this information in an accurate manner to the public.
“जान1 का अ+धकार, जी1 का अ+धकार” “प0रा1 को छोड न’ 5 तरफ”
Mazdoor Kisan Shakti Sangathan Jawaharlal Nehru
“The Right to Information, The Right to Live” “Step Out From the Old to the New”
IS 14615-1 (1999): Measurement of Fluid Flow by Means of
Pressure Differential Devices, Part 1: Orifice Plates,
Nozzles and Venturi Tubes Inserted in Circular
cross-section conduits running full [WRD 1: Hydrometry]
“!ान $ एक न’ भारत का +नम-ण”
Satyanarayan Gangaram Pitroda
““IInnvveenntt aa NNeeww IInnddiiaa UUssiinngg KKnnoowwlleeddggee””
“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता हहहहै””ै”
Bhartṛhari—Nītiśatakam
“Knowledge is such a treasure which cannot be stolen”

.
’
IS1461~5(Part1):1999
IS0 5167-1 : 1991

Indian Standard
TNEMERUSAEM FO D-IULF FLOW YB SNAEM FO
ERUSSERP LAITNEREFFID SECIVED
PART 1 ORIFICE PLATES, NOZZLES ANDVENTURITUBES INSERTED IN CIRCULAR
CROSS-SECTION CONDUITS RUNNING FULL
ICS 17.120.10
Q( SIB 1999
BUREAU OF INDIAN STANDARDS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002

Ja7waryl999 Price Rs. 220.00
diulF wolF tnemerusaeM lanoitceS ,eettimmoC RVD 1
LANOITAN FOREWORD
sihT naidnI dradnatS hcihw si lacitnedi htiw fS0 l-7615 : 1991 tnemerusaeM‘ of diulf wolf yb snaem of
erusserp laitnereffid secived - traP 1 : ecifirO ,setalp slezzon dna irutnev sebut detresni ni ralucric
noitces-ssorc stiudnoc gninnur ’lluf deussi ehtyb lanoitanretnI noitazinagrO for noitazidradnatS )OSI(
saw detopda yb eht uaeruB of naidnI sdradnatS no eht snoitadnemmocer of diulF wolF tnemerusaeM
lanoitceS eettimmoC (RVD )1 dna lavorppa of eht reviR yellaV noisiviD .licnuoC
reverehW eht sdrow lanoitanretnI‘ ‘dradnatS raeppa gnirrefer ot siht ,dradnats yeht dluohs eb daer sa
naidnI‘ .’dradnatS
Comma ),( sah neeb desu sa a lamiced ,rekram elihw ni naidnI ,sdradnatS eht tnerruc ecitcarp si ot esu
a tniop (.) sa eht lamiced .rekram
tnemdnemA .oN 1 ot eht evoba lanoitanretnI dradnatS sah neeb detnirp ta eht .dne
CROSS REFERENCES
ehT gniwollof lanoitanretnI sdradnatS evah neeb derrefer ot for hcihw ereht era on gnidnopserroc naidnI
sdradnatS tub yeht yam eb elbatpecca for esu ni noitcnujnoc htiw siht dradnats :
0SI 6812 : 3791 diulF wolf ni desolc stiudnoc - snoitcennoC for erusserp snoissimsnartlangis
neewteb yramirp dna yradnoces stnemele
0SI 6004 : 1991 tnemerusaeM of diulf wolf ni desolc stiudnoc yralubacoV- dna slobmys
0SI :8615 8791 tnemerusaeM of diulf wolf - noitamitsE of ytniatrecnu of wolfa etar tnemerusaem
RT/OSI 3133 : 4791 tnemerusaeM of gnitaslup diulf wolf ni a epip yb snaem of ecifiro ,setalp
slezzon ro irutnev ,sebut ni ralucitrap ni eht esac of ladiosunis ro erauqs
evaw tnettimretni cidoirep epyt snoitautculf
nI siht ,dradnats 0SI 864 : 2891 ecafruS‘ ssenhguor - ,sretemaraP rieht seulav dna lareneg selur for
gniyficeps ’stnemeriuqer sah osla neeb derrefer ot for hcihw si~ereht on gnidnopserroc naidnI .dradnatS
,revewoH for lufesu noitamrofni gnidrager ecafrus ssenhguor naidnI dradnatS SI 3703 : 7691 tnemssessA‘
of ecafrus ’ssenhguor yam eb derrefer .ot
IS 14615 (Part 1 ) : 1999
IS0 5167-l : 1991
Contents
Page
1 scope ................................................................................................. 3
2 Normative references ....................................................................... 4
3 Deftnttlons .................................................................................... 4
-4 Symbols and subscripts ............................................................. 7
4.1 Symbols ..................................................................................... 7
4.2 Subscripts .................................................................................. 8
5 Principle of the method of measurement and computation ... 8
6.1 Principle of the method of measurement ............................... 8
5.2 Method of determination of the diameter ratio of the selected
standard primav device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . 8
5.3 Computation of rate of flow . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . 8
5.4 Determination of density .......................................................... 9
6 General requirements for the measurements ......................... 9
6.1 Primary device .......................................................................... 9
6.2 Nature of the fluid ..................................................................... 9
6.3 Flow conditions ......................................................................... 10
7 Installation requirements .......................................................... 10
7.1 General . ..*..................................................,.............................. 10
7.2 Minimum upstream and downstream straight lengths required for
installation between various ftttings and the primary device 11
7.3 Flow conditioners . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . 13
!
7.4 General requirements for flow conditions at the primary
device . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . .. .. . . . . l-6
i
7.5 Additional specific installation requirements for orifice plates,
nozzles and Venturi nozzles . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . .. . . . 16
7.6 Additional specific installation requirements for classical Venturi
tubes . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . ..*...................... 18
6 Orffke plates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

1
IS 14615 (Part 1) : 9991
IS0 l-7615 : 1991
1.8 noitpircseD .............................................................................. 81
2.6 erusserP sgnippat ................................................................... 02
3.8 stneiciffeoC dna gnidnopserroc seitniatrecnu fo ecifiro setalp 32
4.8 erusserP ,ssol Aw ........................... 52.......................................
8 selzzoN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
1.8 ASI 2391 elzzon ....................................................................... 52
2.8 gnoL suidar selzzon ............................................................... 82
01 irutneV sebut ........................................................................... 03
1.01 lacissalC irutneV sebut ........................................................ 03
2.01 irutneV elzzon ....................................................................... 63
11 seitniatrecnU no eht tnemerusaem fo etar-wolf .................. 39
1.11 noitingeD fo ytniatrecnu ....................................................... 93
2.11 lacitcarP noitatupmoc fo eht ytniatrecnu ............................ 39
sexennA
A selbaT fo egrahcsid stneiciffeoc dna ytilibisnapxe ]noisnapxe[
srotcaf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
B lacissalC irutneV sebut desu edistuo eht epocs fo siht trapa fo
0SI 7615 . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . * . , . . . . . . . . . . . . . . . . . . . . . ., . . . . . . . . . . . . . . . . . . . . . . . 75
C erusserP ssol ni a lacissalc irutneV ebut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95-
D evitareti snoitatupmoc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
E selpmaxE fo seulav fo eht epip liaw mrofinu tnelaviuqe ,ssenhguor
36
k . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2
IS 14615 (Part 1) : 1999
IS0 5167-1 : 1991
lndian Standard
TNEMERUSAEM FO DIULF FLOW YB SNAEM
OF
ERUSSERP LAITNEREFFID SECIVED
PART 1 ORIFICE PLATES, NOZZLES AND-VENTURITUBES INSERTED tN CIRCULAR
CROSS-SECTION CONDUITS RUNNING FULL
1 epocs 0SI 7615 tonnac eb desu rof epip sezis ssel naht
05 mm or more naht 1 002 mm or rof epip sdlonyeR
srebmun woleb 3 .051
sihT trap fo 0SI 7615 selftceps eht yrtemoeg dna
dohtem fo esu noitallatsni( dna- gnitarepo )snoitidnoc tI slaed htiw secived rof hcihw tcerid noitarbilac -xe
fo ecifiro ,setalp selzzon dna irutneV sebut nehw stnemirep evah neeb made, tneiciffus nI ,rebmun
yeht era detresni ni a tiudnoc gninnur lluf ot -reted daerps dna ytilauq ot elbane tnerehoc systems fo
enim eht etar-wolf fo eht diulf gniwolf nI eht .tiudnoc noitacilppa ot eb desab no rieht stluser dna co-
tI osla sevig yrassecen noitamrofni rof gnitaluclac stneiclffe ot eb nevig htiw niatrec elbatciderp stimil
eht etar-wolf dna sti detaicossa .ytniatrecnu fo .ytniatrecnu
tI seilppa ylno ot erusserp laitnereffid secived ni ehT secived decudortni otni eht epip era dellac
hcihw eht wolf sniamer cinosbus tuohguorht eht yramirp“ .”secived ehT term yramirp ecived osla
gnirusaem noitces dna si ydaets or seirav ylno sedulcni eht erusserp .sgnippat llA rehto -urtsnf
ylwols htiw time dna erehw eht diulf nac eb -noc stnem or secived deriuqer rof eht tnemerusaem era
deredis sa .esahp-elgnis nI ,noitidda hcae fo eseht nwonk sa yradnoces“ .”secived sihT trap fo
secived nac ylno eb desu nihtiw deificeps stimil fo 0SI 7615 srevoc yramirp ;secived yradnoces
epip ezis dna sdlonyeR .rebmun suhT siht trap fo )’secived lliw eb denoitnem ylno .yllanoisacco

1) ‘eeS 0SI ,37919812
Fluid flow in closed conduits - Connections for pressuresignal transmissions between primary 8nd
seCOnd8ry elements.
IS A4615 (Part 1 ) : 1999
IS0 5167-1 : 1991
The different primary devices dealt with in this part The following definitions are given only for terms
of IS0 5167 are as follows: used in some special sense or for terms the mean-
ing of which it seems useful to emphasize.
a)
orifice plates, which can be used with corner
pressure tappings, D and D/2 pressure
tappings*), and flange pressure tappings: 3.1 Pressure measurement
b)
ISA 1932 nozzles*, and long radius nozzles,
3.1.1 wall pressure tapplng: -Annular or circular
which differ in shape and in the position of the
hole drilled in the wall of a conduit in such a way
pressure tappings;
that the edge of the hole is flush with the internal
lc surface of the conduit.
classical Venturi tube@, and Venturi nozzles,
which differ in shape and in the position of the
The hole is usually circular but in certain cases may
pressure tappings.
be an annular slot.
2 Normatlve references
3.1.2 static pressure of a flUId IlowIng through a
The following standards contain provisions which, straight plpeline, p: Pressure which can be meas-
through reference in this text, constitute provisions ured by connecting a pressure gauge to a wall
of this part -of IS0 5167. At the time of publication, pressure tapping. Only the value of the absolute
the editions indicated were valid. All standards are staticpressure is considered in this part of IS0 5167.
subject to revision, and parties to agreements based
on this part of IS0 5167 are encouraged to i’nvesti-
3.1.3 differential pressure, Ap: Difference between
gate the possibility of applying the most recent edi-
the (static) pressures measured-at the wall pressure
tions of the standards indicated below. Members of
tappings, one of which is on the upstream side and
IEC and IS0 maintain registers of currently valid
the other of which is on the downstream side of a
International Standards.
primary device (or in the throat for a Venturi tube)
inserted in a straight pipe through which flow oc-
-ISO 468:1982, Surfece roughness - Parameters, their
curs, when any difference in height between the up-
values and general rules for speciming
stream and downstream tappings has been taken
requirements.
into account.
IS0 4006:1991, Measurement of fluid flow in closed
In this part of IS0 5167 the term “differential press-
conduits - Vocabulary and symbols.
ure” is used only if the pressure tappings are in the
positions specified for each standard primary de-
IS0 5168:-m, Measurement of t7uid t7ow - Evaluation
vice.
of uncertainties.
3 Deflnltlons 3.1.4 pressure ratio, t: Ratio of the absolute (static)
pressure at the downstream pressure tapping to the
For the purposes of this -part of IS0 5167, the defl- absolute (static) pressure at the upstream pressure
nitions given in IS0 4008 apply. tapping.
2) Orifice plates with vens contracts pressure tapping8 are not considered in this part of IS0 5167.
3) ISA is the abbreviation for the International Federation of the National Standardizing Associations, which W8S SUC-
ceedd by IS0 in 1949.
4) In the USA the classical Venturi tube is sometimes called the Herschel Venturi tube.
5) To be published. (Revision of IS0 5168:1978)
4
SI 51641 ( Part 1) : 1999
IS0 l-7615 : 1991
2.3 Primary devices 2.3.3 Reynolds number, Re: sselnoisnemiD par-
ameter gnisserpxe eht oitar neewteb eht aitreni dna
1.23 ;ecfflro throat: gninepO fo muminim cross- suocsiv .secrof
lanoitces aera fo a yramirp .ecived
ehT sdlonyeR rebmun desu ni siht trap fo 0SI 7615
dradnatS yramirp ecived secifiro era ralucric dna si derrefer ot
laixaoc htiw eht .enilepip
- rehtie eht maertspu noitidnoc fo eht diulf dna eht
2.2.3 ecfflro plate: nihT etalp ni hcihw a ralucric maertspu retemaid fo eht ,epip .e.i
erutrepa sah neeb .denihcam
u,D Q,n
ReD=F=-
dradnatS ecifiro setalp era debircsed sa niht“ WlD
”etalp dna htiw“ prahs erauqs ,”egde esuaceb eht
ssenkciht fo eht etalp si llams compared htiw eht - or eht ecifiro or taorht retemaid fo eht yramirp
1 retemaid fo eht gnirusaem noitces dna esuaceb eht ,ecived .e.i
maertspu egde fo eht ecifiro si prahs dna .erauqs
Red=- ReD
I 3.2.3 nozzle: hcihweciveD stsisnoc fo a tnegrevnoc B
telni detcennoc ot a lacirdnilyc noitces yllareneg
dellac eht .”taorht“ 3.3.3~ ISenbOplC exponent, K: oitaR fo eht evitaler
noitairav ni erusserp ot eht gnidnopserroc evitaler
4.2.3 Venturi tube: eciveD hcihw stsisnoc fo a -noc noitairav ni ytisned rednu yratnemele elbisrever
tnegrev telni detcennoc ot a lacirdnilyc trap dellac citabaida )ciportnesi( noitamrofsnart .snoitidnoc
eht ”taorht“ dna na gnidnapxe noitces dellac eht
ehT ciportnesi tnenopxe sraeppa ni eht tnereffid
”tnegrevid“ hcihw si .lacinoc K
ealumrof- rof eht ytilibisnapxe ]noisnapxe[ rotcaf e
fI eht tnegrevnoc telni si a dezidradnats ASI 2391 dna seirav htiw eht erutan fo eht sag dna htiw sti
,elzzon eht ecived si dellac a irutneV“ .”elzzon fI eht erutarepmet dna .erusserp
tnegrevnoc telni si ,lacinoc eht ecived si dellac a
erehT era ynam sesag dna sruopav rof hcihw on
lacissalc“ irutneV .”ebut
seulav rof evah neeb dehsilbup os .raf nI hcus a
K
I ,esac rof eht sesoprup fo siht trap fo 0SI ,7615 eht
3.2.5 diameter ratio of a primary devke used In a
oitar fo eht cificeps taeh seiticapac fo laedi sesag
given pipe, j?: oitaR fo eht retemaid fo eht ecifiro (or
nac eb desu ni ecalp fo eht ciportnesi .tnenopxe
)taorht fo eht yramirp ecived ot eht lanretni retemaid
fo eht gnirusaem epip maertspu fo eht yramirp -ed
.eciv 4.3.3 discharge coefficient, C ,tneiciffeoC denifed
rof na elbisserpmocni diulf ,wolf hcihw setaler eht
,revewoH nehw eht yramirp ecived sah a lacirdnilyc lautca etar-wolf ot eht laciteroeht etar-wolf hguorht
noitces ,maertspu gnivah eht same retemaid sa taht a .ecived tI si nevig yb eht alumrof
fo eht epip (as ni eht esac fo eht lacissalc irutneV
,)ebut eht retemaid oitar si eht tneitouq fo eht taorht
-diameter dna eht retemaid fo siht lacirdnilyc noitces
ta eht enalp fo eht maertspu erusserp .sgnippat
noitarbilaC fo dradnats yramirp secived yb snaem
3.3 Flow fo elbisserpmocni sdiulf )sdiuqil( swohs taht eht -sid
egrahc tneiciffeoc si tnedneped ylno no eht
3.3.1 rate of flow of fluid passing through a primary sdlonyeR rebmun rof a nevig yramirp ecived ni a
device, 4: ssaM or emulov fo diulf gnissap hguorht nevig .noitallatsni
1
eht ecgiro (or )taorht rep tinu time; ni lla sesac ti si
yrassecen ot etats ylticilpxe rehtehw eht mass etar ehT laciremun eulav fo C si eht same rof tnereffid
fo wolf ,,,,q desserpxe ni mass rep tinu‘ time, or eht snoitallatsni revenehw hcus snoitallatsni era -eg
emulov etar fo wolf ,vq desserpxe ni emulov rep tinu yllacirtemo ralimis dna eht swoif era deziretcarahc
time, si gnieb .desu yb lacitnedi sdlonyeR .srebmun

5