Float Flow Meter

8/11/2019 Float Flow Meter

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Use manual

LZB LZJ LZT series

The common type rotor flow meter anticorrosion flow meter

the whole stainl ess steles rotor flow meter plasti c tube rotor

flow meter

These products carry out JB/T9255-1999 standards

These products have already passed ISO9001 international

quality system

MCZhe zhi 02810103

YuYao YinHuan flow apparatus company ltd

Zhe jiang YuYao flow qpparatus factory

Addre ss: Yu Yao nor theast str eet industry zone cai hon g roa d No1

Code:315400

Telephone:0574-62689088

(sale fax) 0574-62689099 62689077

Open on account :Yu Yao industry and commerce bank

Acc oun :39 013 10009 102 001 630

The Ningbo economic technical zone

Yin huan apparatus commercial company


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315400

Yu Yao northeast stree t indust ry zone cai hong road No1

Yu Yao yin huan flow appara tus company ltd

Commercial company

One Introduction

The rotor flow meter (call flow meter as follows ) mainly usedfor a chemica l eng ineer ing ,pe t ro leum, l igh t indust ry ,medicine,chemical fertilizer,papermaking,food ,environmentalprotec tion and science research department , which areconven ient to measure non-pulsation and single phase fl uid(liquid and gas).

Anti-corrosive flow meter is mainly used for measuring

the corrosive liquid gas ,for example acid liquid (hydrofluoricacid excepted),a sodi um liquid (sodium of thi ck hydrogenoxidizes excepted ), oxidizing liquid , organic liquid andcorrosive gas.

Two Structure and principle

The main measu rng c omponen t of the flow meter is atapered tube ,its small end is downward , a its l arge end isupward , install ing perpend icularly. In the tapered tube thereis a float which can move up and down freely . When theliqui d flows fr om top to bottom through the tapered tubebetween upside and downsi de of the float creates deffi renceof pressure so the float moves up or down.

When this rising force floati ng force of float force ofviscosity and the gravi ty of floa t is equal , the float is placedin a equilibrium position .Therefore, the fluind flows throughthe flow meter , the float increases height he re exist s acertain proportion, postition of float as a measuring quantity.

Reading digit al of flow meter canbe read accord ingthefigure 1

Figure 1 reaing diagram of various floats

Our factor y produces flow meters which contai n LZB

series LZJ seriesand LZT series etc. They mainly are

3 4

40

10

20

Center line

of tanered tube

Readingposition

Readingposition

Readingposition

Readingposition


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5

1. outflow mouth

2. upper base

3. upper gland

4. tapered tube

5. otganic glass shell

6. suppotting plate7. float

8. lower gland

9. lower base

10. inflow mouth

11. Needle valve

Figure 2-2 LZB-4, 6,10 shape di agram

6

comosed of tapered tube float upper base lower base

upper stopping Lower stopping V support ing p late outside

cover and sealed ring etc . Flowmeter for caliber less then

10mm adopts a hose conjunctinons and has a needle v alve to

regulate quantity of flow as shown in figutr 2 For the caliber

above 15mm is used flange conjunction (flange conjunction

according to the JB78-59iron casting ,methodrule), thety ?

Struc ture ard shon in fighre3, shape and junction size are intales 1 2 3.

Figure 3-1 is the structure of flowmeter LZB with caliber DN25 above. Dif feence in structures between DN 15 and DN 25above is that , in DN 15 t here is no guide pol which can makefloat to move uo and down calmly and protec ts the taperedtube.

The LZT-Tseries have same measuring principle, therystrutures are shown in the figure4

Figure 2-1 LZB-2, 3 shape diagram

1 instralli ng diagram of lowre base 6 insta lling diagram oflower base2 joint of hose tube 7 brand3 float 8 shell4 tapered tube 9 cross screw5 support plate 10 cross screw

1

2

3

4

5

6

7

8

26 21

31

26

109

LZB-3

2-M6

2-M8X

110

132

150

model

caliber(mm)

measuring ratio

working pressure(Mpa)

starting pressue(mmHO )2

accura te g rade( %)

-2

2

1:10

1

20

4

0.4 4

0.6 6

1 10

1.6 16

6 60

10 100

16 160

28 250

-2

2

1:10

1

20

4

2.5 25

4 40

6 60

10 100

40 400

60 600

100 1000

160 16000

measuringscope

liquid(ml/mim)

gas(ml/mim)

9

10

11

2x116

E(length X width)

CBA

1

2345678


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Figure 3-1 LZB-15-100 shape size

Connection:hose conjunctions

4,6,10 base material of anti-corrosive flowmeter 1Cr18Ni9Ti

1 .base

2 . Brand

3. Shell

4.tapered tube

5.float

6.gland

7. Supporting plate

8. Screw

9.stopping

10. Bush

Table 1 LZB -4,10 shape installing diagram

Our anti-corrosive flowmnter LZB-F series are mainly composed

of F4 f loat (polytetraflioroethylene) P4 upper base P4Lower

base upper stopping suppirting front and back shellV sealed

ring and seal di aphragm etc. In the anti- corrosive flowmeters

are used flange conjunctions (flange conjunction according to

the JB78-59iron casting method rule), its schematic diagram of

struc ture is shown in the figure 3-2 . The shape connection

size is the same as Lzb seri es . See table 2.

Table 2 LZB LZJ 15-100 shape installing size

Connection: hose conjuctions

1. Base

2. Brand

3. Shell

4.tapered tube

5.float

6. Gland

7. Sealed ring and diaph ragm

8. Screw

9. Stopping

10. Bush

Figure 3-2 LZB-15F-100F installing diagram

7 8

9

10DE

7

8

6

5

4

3

2

1

size(mm)caliber (mm)

4

6

10

40x34(front side)170

170

170 208

208

208

238

238

238

40x34(front side)

40x34(front side)

EA B C D

11

11

11

Caliber(mm)

15

25

40

50

80

100

Size (mm)

A B C D E

95

115

145

160

185

205

65

85

110

125

150

170

470

470

570

570

570

170

15

25

40

50

80

100

4- 14

4- 14

4- 18

4- 18

4- 18

4- 18

9

10DEB

1

2

3

4

5

6

7

8

C


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The structure of LZJ-40F, LZJ-50F gas rotor flowmeter is like

figure 3-2 or similar as gifure3-2.The structure of LZB-F

Dn80Dn100 anty-c orrosi ve flowmeter is siml iar as figure 3-2,

defference in the structure is that in the float therer is a guide

pole, which makes float to move up and down calmly and

protect the tapered tube.

In the JZB-50F rotor flowmeter , there is another packing.

Af ter opening the Pack ing , as figure 3-3,at fi rs t law down

horizontally and put a float into it , after install ingring slowly

put the tapered tube to verti cal posit ion, only after that insta ll

tapered tube on the piipe.

Figure 3-3 JZB-50F insta lling diagram

9 10

In the spare parts, which contect anti-corrosicve flowmeter

and midum, is used anti-corrosive material-fluorine plastice F4,

which have good anti-corrosive quality and very dependable

valid.

1. connection pipe

2. nut

3 . 0 type sea l t ing

4. lower stopping

5. float

6. taperad tube

7. standare scale

8. upper stopping

Figure 4 LZT-15-65S installing diagram

Table 3 LZT-S shape install size

Caliber(mm)

LZT-15S

Size (mm)

L D D

280

380

435

430

20

32

63

75

45

68

98

122

Suitable piping caliber

LZT-25S

LZT-50S

LZT-65S

DN

15

25

50

65 75

D

d 1

2

3

4

5

6

7

8

1

2

3


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When open the packing boxes should carefu lly examine

them whether any damage or not during the process of

transport. For LZB flow meter with guide pole should t ake

out supporting filling materials and to check whether the

float can move up and down freely or not.

Flow meter must be installed in the vertical position(Angle

between center or flow meter and plumb line is not more

than five degress), and the right support, and to prevent

any spread of stress.Before installing washed and the

small est end of the tapered tube always must be set at the

bottom.

In order to replace parts in the process of using in time

installation it should allow sufficient surrounding space.

For maintenance repair replacement of flow meter and

cleaning pipe recommend flow meter installation according

to the figure 5.

1.

2.

3.

4.

11

Three install and use

5.

6.

12

In the upstream of flow meter should be insta lled a valve,

in the downstream 5-10 times of caliber should be installed

the flow control valve.

To prvern t back st remai ng in the pipe or damage due to

action of water cone after the downstream va lve should be

installed a one-way valve.

If the measu red f luid contains larger partic les o r dirt ,

should be installed filt ers on the flow meter.

If the measured mainstream is pulsed , so the float can not

correctly measure flow, in that case upstream valver

should be all opened and set the ti mer and buffe r.

Figure5 bypass pipe install diagram

7.

8.

flewmeter

flewmeter

flewmeter

YashingBypasstube

Bypasstube

Bypasstube

One-


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1.

2.

3.

4.

13

Use

In time of using flow meter should slowly open the

upstream control valve. After that adjust flow by control

valve of downstream, and then close flow meter flow

contrlol valve.

In time of suing shoukd avoid the intense changers of

measured liquid pressure.

Read reading of float as shown in the figure1.

If the working diameter of float is injur ed, should make

calibration again

In time of using flow meter if take place leaking, should

evenly fasten bolts or gland, at this ti me should avoid

fastening over and break the cone

In time of Rrplacing sealed packing, tapered tube or float

at f irst carefully evenly removed shell bolts or gland and

then support plate the upper and lower base. In the

proccess do not force too large and to be care ful.

If the floater and the tapered tube were polluted should

clean them in time.

6.

7.

5.

8.

9.

14

I f the s ta te o f Measur ing f lu id (dens i ty , tempera ture ,

pressure,viscosity etc.is not the same as indicated.

Should make temperature of our LZB producdts--- -20 - + 20 .

Calibration again

Suitable

Four value revise of flowmeter

In the using the liquid and its state often is different from

calibration conditions, therefore, customers have to carry

on cor rection to get correct value of the flow.

In out factory carry out calibration, using water or air in

the standard state:water at 20 , air at 20 ,

1.03X10Pa(760mmHg), therefore , correction all takes int the

standard state.

1. Revise when measuring liquid

Counting flow through flowmeter in the using state:

-----------(1)(P - P) Pyr SQ =QyS(P f-PN)P y


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In the formula:

Qs----- the actual flow value.

Qn-----reading value of flowmeter

Pf------density of float

Pn-----density of measuring media in the standard state.

PS-----density of measuring liquid.

Revise of measuring gas

(1) Couting flow through flowmeter in the using state for

dry gas:

In the formula:Pn, Tn, pn-------In the standard state abso

lute pressure 1,03X10Pa (760mmHg), absol ute tempaerature

(273.15+20)K and density of measuring media (air);

Ps, Ts, psn ----- -absolute pressure, absolu te temper ature

and density of measuring gas in the standard state of

measuring gas.

Zsn--------the compression factory of measurig gas in the

standard state.

2.

15

-----------(2)

3.

16

Zs--- --the c ompression factory o f measu ring gas in Ps, Ts.

(2) Counting flow through flowmeter in the using state for

wet gas:

In the formula; Qsw------actual flow value of wet gaw;

S----- the relative humidity of measuring gas;

Pf-----density of float;

Pds ,pds ------saturated steam pressure and density

measured gas at Ts;

Zsn, Zs-------the compression factory of measuring gas in

the Ps Ts and Ts.

Revise of viscosity

In the using viscosity of measured liquid always is differ

ent from the calibration conditions , therefore.customer s

have to carry on correction to get correct value of viscosit y.

Since measuring result i s all i nfluenced by the viscosity of

liquid f low and caliber of taperedd tube shape of f loat

etc., So the factory can hardly provide correct viscosity

coefficient,

Suggest customer oneself carries on calibration.

p -P T ZN sN sQ =QyS

p -P T Z NssN s s

. .P T ZN s s

Q =QNSWp (P P )T ZD N NsN s s s s

.+ Ps Ds

pN

-----------(3)


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4.

17

-----------(2)

Value correction example

(1) measured as a liquid:

Suggest that measured media is clean water, indication of

flowmeter is 6m3/h, temperature of inflow mouth is 40 , a

pressure as 0.9 M pa(9kg f/cm2) , material of float as

stainless steel pf = 7900kg/m2, counting actual flow value

through flowmeter.

Soltutin:

Search in the manual:

At 40 pressure 0.9 Mpa (9Kg/cm2) (absolute pressure

1Mpa(10Kgf/cm2) ,therefore, water density ps =992.65kg/m2;

at 20 , absolute pressure 760mmHg (1.013X105Pa), then,

ps=998.303kg/m3.

Actual flow from formula 1 through flowm erer:

18

(2) measured gas as dry gas:

measured gas as a dry gas, indication of flowmeter is 50

m3/h,float material is 1Cr18Ni9Ti, temperature of inflow mouth

is 10 , absolute pressure PS=0.5MPa (5kgf/cm2). Counting

actual flow value throug flowmeter.

Soluti on: Sdearc h densi ty of d ry air in the standar d state in the

manual: ps=psn=1.2046kg/m3, the compression factory

Zs=0.9990, at 10 ,the comprssion factory Zs =0.9992.

From the formula 2 clounting actual volume flow through

flowmeter in the using state.

3 = 6.02m /h

p p p( r n) s

Q =QNS p p p( r s) N =6 7900-992.654 998.303 7 90 0- 99 8. 30 3 9 92 .6 54

3 = 21.978m /h

Q =QNS (p P T ZN N S S =50 1. 29 46 1 ( 27 3. 15 +1 0) 0 .9 99 2 1 .2 94 6 5 ( 27 3. 15 +2 0) 0 .9 99 0(P P T ZS S N SN


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19

(3) measu red gas as a we t gas :

Suggest that measured gas is a wet gas, relative humidity at

inflow mouth of fl owmeter S=0.7 , other condi tions are the

same.

Solution : at 10 , absolute pressure 0.5 Mpa (5kg/cm2), then ,

saturated steam pressure Pts=0.0173kgf/cm2, steam Density

pds=0.01282kgf/cm3.

Actual flow of wet ai r thr ough flow meter from formula 3:

Five the show of error

The show of error of flow meter as below:

In the formula:

Qn-------Value of flow meter;

Qn------actual flow of liquid through flow meter;

Qmax-------measuring limits of flowmeter.

Table 4 technical parameters of rotor flow meter

20

notice:

Legal measuring unit 1kg. Cm2=9.80665X104Pa, for measuring

convenicence is taken 1kgf /cm2 105Pa 0.1MPa.

Model

caliber(mm)

measuring ratio

working pressure(MPa)

starting pressue (mmH0 )2

accurate g rade ( %)

Measuring

Scope

Liquid

(L/h)

gas

(L/h)

-40

40

1:10

0.6

420

1.5

0.16-1.6

0.25-2.5

4-40

6-60

-50

50

1:10

0.6

160

1.5

0.4-4

0.6-6

1-10(Special)

10-100

16-160

-25

25

1:10

0.6

170

1.5

0.04-0.4

0.06-0.6

0.1-1

1-10

1.6-16

2.5-25

-80

80

1:5

0.4

500

1.5

1-10

1.6-16

7-30(Special)

50-250

80-400

-100

100

1:5

0.4

760

1.5

5-25

8-40

12-60(Special)

120-600

200-1000

Model

caliber(mm)

measuring ratio


starting pressue (mmH 0)2


Measuring

Scope

Liquid

(L/h)

gas

(L/h)

-4

4

1:10

1

20

4

1-10

1.6-16

2.5-25

16-160

25-250

40-400

-6

6

1:10

1

40

2.5

2.5-25

4-40

6-60

40-400

60-600

100-1000

-15

15

1:10

0.6

100

2.5

16-160

25-250

40-400

250-2500

400-4000

600-6000

-10

10

1:10

1

70

2.5

6-60

10-100

16-160

100-1000

160-1600

250-2500

=50 1.2046

(5-0.7 0 .017375) (273.15+20) 0 .9990

1.2046

3 = 22.35m/ h

+0 .7 0 .021282 1 .0332 (273 .15+10) 0 .9992

. .P T ZN s s

Q =QNSW p (P P )T ZD N NsN s s s s .+ Ps Ds

pN

Qn-Q= 100%Qmax


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Tbale 5 technical parmeters of Lzb rotor Flow meter

Table 6 Materials

notice:

1. Materials of all flow meter (LZT-Series excepted) are

made of high -borron silicon glass:

2. Material can be changed according to the request of

customers.

3. Material stainless steel of flow meter -1Cr18Ni9Ti.

Services for you

Table 7 Technical parameters of LZT-15-65S rotor

Flow meter

Model

caliber(mm)

measuring

scope(L/h)liquid

accu rate g rade( %)

working pressure (Mpa)

LZB-15

15

4-90

2.5

0.6

LZB-25

25

70-700

2.5

0.6

LZB-50

50

450-7000

2.5

0.6

LZB-80

80

7000-30000

2.5

0.4

LZB-2, LZB-3, LZB-4, LZB-6, LZB-10

base stopping float sealflling

brass HP59-1 PTFEstainless steel

1Cr18Ni9Ti

acid-resistingalkali rubber IV-1

LZB-15, LZB-25 , LZB-40

base Lead staff float sealflling

stainless steel1Cr18Ni9Ti

acid-resistingalkali rubber

ironinner padamino baking lacquer


sealflling



LZB-15, LZB-25 , LZB-40

base float

acid-resistingalkali rubber

Ironinner padacid-resistingalkali rubber IV-1

Lead staff

22

ABS ABS ABSAS

tapered tubefloat connection tubestopping

Model

caliber(mm)

measuring ratio



measuring

scope

LZT-15S

15

1:10

0.6

4

0.01-0.1

0.016-0.16

0.025-0.25

0.04-0.4

25

1:10

0.6

2.5

0.1-1

0.16-1.6

0.25-2.5

LST-65S

65

1:10

0.4

2.5

5-25

8-40

12-60

50

1:10

0.4

2.5

0.4-4

0.6-6

1-10

1.6-16

measuring

scope3

( m / h )

LZT-25S LZT-50S

0.06-0.6

Float Flow Meter

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