eductor jerguson

8/13/2019 Eductor Jerguson

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Usingerguson Jacoby Tarboxductors forPumping Liquids

Section: E200Bulletin: E200 1Version: 1 93Supersedes: New


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How to Size Liquid Motive Eductors for Pumping Liquids

Using Liquid Motives toPump Liquid Suction FluidsTo determine the correct eductor for a specifie application, follow the steps in this section, using the performance tables (pages3-4) provided to achieve your desired results.(NOTE: All JR JT tables use the 1 1/2 inchunit as the standard, and educlors are sizedusing a Sizing Factor (S.F.) based on thisstandard uni .)

Step 1 Find the suction lift* or head (Hs)that is equal 10 or greater than your desiredlift.lrYOUT lift is between wO of the liftson the table, use an average of the two. Youcan also or use the calculated result from theNPSH formula found on page 5of thismanuaL Using the NPSH number will correct for temperature variations and frictionlosses, resulting in a more accurate value.Step 2 Find the outlet head (Ho) equalto or greater than your actual outlet head. t

important to include friction losses intot e desired outlet head. (Be certain that friction losses in the outlet line are calculatedusing the combined rate ofborh the motiveand the suction flows.) II is important thatthe outlet line from the eductor be as largeor larger than the outlet connection.Step 3 Find the motive pressure (pm).Locate the motive pressure from the tablethat is closest to or fOlrer than your actualmotive pressure. The flow specified represents the Tabulated Suction Flow for each ofthe different models of eductors. To determine the size of eductor needed first usethe following formula to determine theDesired Sizing Factor (S.F.) Do this for eachof the models.D . d S F Desired Suction FloweSlre Tabulated Suction FlowIfa standard unit is being used, pick thesize unit that has a Tabulated S.F. (page 7)equal to or greater than the Desired S.F.Ifan exact match is desired, consult yourJergusonlJacoby-Tarbox representative or

the factory.

Step 4 Calculate the amount of motiveflow used by multiplying the Qmand Q.found in the tables by the Tabulated S.F.obtained in Step 3. Do this for each of themodels of eductors.Step j 5electthe unit from Steps 1-4 thatbest meets the motive and suction parameters of the specific application. If a turndown ratio ofgreater than 35% isneeded, then choose two or more eductorsthat have the correct turndown ratio andoperate these units in parallel.

In some cases, the unit chosen will havethe greatest suction flow while consuming aslittle motive fluid as possible. This is generally true for pumping applications. In orherapplications, such as the dilution of chemicals, the motive flow should be as high aspossible: while the suction flow will be low.In this case, the motive flow should bematched to the desired motive flow and thesuction port should be throttled to achievethe desired dilution rate. As a general rule indilution applications, the HL is the best unitto choose.In all cases, the correct unit is the onethat matches your desired range ofmotive-to-suction flows the closest.Correcting for Non-WaterFluid SpecificationsThe performance specifications forJRG/JT eductors are based on using waterwith a specific gravity of 1.0 and a viscosityof I Centipoise. Fluids with differing viscosities or specific gravities need to be corrected to water, to obtain accurateperformance estimates.Viscosity is the measure of the internalresistance ofa fluid to flow. This should betaken into consideration in most pressuredrop and flow calculations within a givensystem. When used with JR JT eductors,fluids with viscosities of less than 100 Cpohave a negligible effect. Viscosities of up to500 Cpo can be used with only small corrections. For higher viscosities (applicationsabove 500 Cp.), we suggest that you work

with your trained representative or the applications personnel at the factory. Eductors cabe used with viscosities over 500 Cpo withcalculated adjustments. The effects of viscosity on the pressure drops in the lineleading to the eductor must be calculatedseparately.Specific gravity is the measure of theweight per volume ofa liquid. The performance data for eductors is based on waterhaving a specific gravity of 1.0; other specific gravities will require that adjustments bemade to the performance table value of theeductors. See the topics that follow forspecifics on how to make these adjustmentsMotive Flow AdjustmentsThe motive flow is the amount ofliquidused to power the eductor. To adjust the valufrom the perfonnance table for specificgravity (Sg) of the motive fluid: Multiply thmotive flow in the performance chart by thesquare root of(1I5g).Example:50 GPM Tabulated Flow adjusted for aSpecific Gravity of 1.3: 50 Y I/1.3) 43.85 GPM Actual motive flowSuction Flow AdjustmentsThe best way to adjust for the specificgravity or temperature effects of the suctionfluid is to do the calculation for NPSH (seepage 5 of this manual). Ifyou desire a roughestimate of the specific gravity effect, multiply the suction lift by the specific gravity ofthe liquid. If the liquid temperature exceeds100F, you must use the NPSH calculation,or consult your representative or the factory.Outlet Adjustments

The outlet pressure of the eductor must badjusted for the specific gravity of the outleliquid, particularly if the eductor is discharging to an elevated surface. If the outlet isbeing measured or controlled by a pressureregulator or valve, no adjustment is requiredTo calculate the actual outlet pressure, multply the feet of elevation by the specific gravty of the outlet liquid.

'Suction Lift ' vertical distance. Fl, from the suction connection to the surfact of the suction liquid source. MinllS ' below the suction connection.Outlet Head ' l:nical dis1allCC. Ft. from the outlet connection to the surface f the O U ~ l l i q u i d destination Posith'e - aixJl'e the outlet connection.Use lero for equal to or below outlet connection.Turndown Ratio -(M3.\. suction now minus min. suction now) di,'ided y m3.\. iuction nO , desired.Table data is based on 'lIterlike liouids at a temperature of68 F.


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HL. ML. Sl Liquids Pumping Liquids 2 Unit

21.71 11.7 H.S 26.61 47.6 1 .1U 8 61.2 24.3 41.3 . . . . 30.6 53.2

60 0 1005l HL Ml Sl Hl Ml Sl H1 Ml51 40 016 51 40 016 51 40 01651 40 016 51 40 016 51 40 016a 40 016 51 40 016 51 40 01639 40 016 40 016 51 40 01631 40 38 40 40 23 40 41 30 40 43 40 39 39 20 40 36 40

31 22 5 40 31 22 40 01622 9 16 26 9 40 4113 29 16 40 124 2263123

19 11 13. ,

Suction Flow, 5 (GPM)

8 42

38 42,.

,,,Ml -

6 5146 51

.,

4 40.

43 48 16 4343 48 36 4343 48 36 4341 48 16 4343 48 36 4341 48 16 434348364343 41 36 434148364141 48 36 4343 48 36 4343 48 16 4341 36 36 4343 21 36 4331 11 36 4317 36 42

5 n 4145 33 4145 11 4\45 33 4145 13 4145 11 4145 13 4145 11 4\45 31 4\45 13 4140 11 4140 31 4123 33 41o 33 41

) 13 3233 2233 13

8 423. 42

,

' l

45 33 4145 11 4145 11 4145 11 4145 II 4\45 33 4145 n 4145 31 4145 n 4139 n 4129 11 4120 n 4\

33 4\) 13 15

- 1 1401 40

18 42 3138 42 3\38 42 3138 42 3138 42 3\31 42 3138 42 3138 42 3138 42 3\8 42 3\38 35 3138 25 3\J8 16 3138 6 3\32 3111 31,

I

33 41n 4133 41n 4t33 4133 41II 4133 4133 41n 41n 41I I 4\ ,

16 43 4816 41 4836 43 48l 43 4836 414 4816 41 4816 41 4836 43 4836 41 4836 41 4836 43 4416 41 1436 43 1436 21 4 .

'l Hl ML51 40 4651 40 4651 40 4651 40 4651 40 4651 40 4651 40 4651 40 01616 40 , , ,

0 24 .

., .,8 4238 42 ,,

'

16 43 4816 41 48l6 43 4836 43 4136 43 4816 43 4816 41 4816 43 4816 43 1616 43 U36 34 1136 26 .,

'l HL Ml51 40 i51 l 4i51 40 4i51 40 4i51 40 4651 40 4016 40 4636 40 4624 l i12 l 016

I 40 31.

,

18 42 II31 42 118 42 1138 42 1131 42 1118 18 1118 44 3118 21 1118 22 II33 10 1123 3114 11. ,

,

,,.

16 43 4836 43 4836 43 4836 43 4836 43 4816 41 4836 41 ..16 43 326 29 32 1929 10,

,

I,,_ 9

18 42 3131 42 1131 42 3138 40 3131 33 3131 26 3131 20 3121 7 3111 31, ,

,

,

,48 16 4348 36 4146 36 4340 36 4332 36 4124 36 4115 16 43. 26 13 ,,

11.11 52.2

41 4541 4541 4141 11

2 II .

.,

6 41

,

.

.

47.715.5 26 .

,

3 19 .,

,

L Ml,.23 12

23 10,

,

6 43

36 4136 35,. ,

,

13.4 24.042.

.

- ...

2 2325 13

,,,

30 11 38\9 11 311 31 314 16 .

117.2, ,11 20.9

,

.

,

34 3025 19 ,

16 40 39 36 43 45 36 4312 32 29 16 40 36 16 4324 22 16 II 33 21 36 4116 \2 21 25 16 36 349 21 16 3 31 21

15 6 25 19

21 27 2\21 18 6 ,

'reiSure. I'm {PSIG)I. M1 51 H1 M1 51 Hl40 016 41 40 016 SO 4036 39 l I l 016 .. l29 30 21 31 38 35 4021 20 13 31 31 25 3914825231334

19 13 2913 24

oSIG)

.,,PSIG)

.,(2.200

.1 0OJ ,

'-k(ft l Hoff,,

''''' ,,

''''' ,,

,.'''',.' ,,

,.'''',.'_ 26.7 .71110w lGl'Ml IS 30.6

i i


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1112 Uniquids Pumping liquidsI., MI., S -Suction Flow, SGPM)

P ~ u u r e m PSIGSuet Outlet 20 00 . 00 sl ftl H M , M M. M M M M M M M M20 , , , ,. , 20 , - u , , , , 00 , , , , ,

,. 30 124 , 20 , , , . , ,. , . , , , 00 , , , , 20 , 20 , , , , , 20 , 20 ,

, , 20 20 , 20 8.9 , SIG 00 ,. , , 20 , , , , . , , 20 , , , . , , , , , 0.9 , , ,. , , 00 . . , , , , ,

, I otPSIGl I I I I 1 00 1 I ......... I , 40.4 14.6 25.6 _,1 3 3 ,,_. ,., 21.lf ........ ,,. 12.4 11.1 45.6 16. 28.2 ,,-, . 1 69.0 24. 42.2 86.2 m Sl.roLR


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IHow to Determine Net Positive Suction Head

Net Positive Suction Head (NPSH) is oneof the most used terms for pumps (includingeduclors) and also one of the least understood. Simply stated PSH is a melhod ofevaluating a sel of suction conditions for apump. This formula takes into account variables for the panicular liquid being pumpedand the conditions under which it is beingpumped. It corrects them 10 a set of standardconditions. This allows the user 10 reliablypredict the performance of a given pumpwhen liquids with varying temperatures,specific gravities, and vapor pressures arebeing pumped. This formula also correctsfor friction loss in the pump suction.When being used wilh educlors, it isimportant that the NPSH be calculated forboth the motive and the suction fluids. Thisis because the motive fluid is also exposedto the reduced pressure in the suction chamber of the eduetor. Failure 10 consider thiscould resul in the motive or suction fluidflashing to a gas as it enters the suctionchamber. This would cause the eductor topump reduced or no suction fluid, or possibly cause the moti\ e fluid to flow out thesuction pon. When delermining t NPSHof both, the one with the higher vapor pressure will be the limiting liquid.NPSH should always be calculated at the

centerline of the eduetor. This calculationwill result in an adjusted pressure in feet ofliquid (water). It must be equal to or greaterthanthe PSH on the Iable (see page I toachieve the performance at these conditions.NOTE: Many eductor manufacturersspecify performance in feet of water lift at60 to 70F. As a rule, this can be changed toNPSH by subtracting the lift from 33 Ft, orin the case of a positive suction head byadding it to 33 Ft.Calculate the NPSH of the suction fluidby using the following formula:

NPSH 2.JI P ; - P l ~ gHs - HfHf Friction loss in the suction piping atfull flow conditions. Specified in feet of liquid. This frequently can be found in a handbook on flow through pipes if the pipingarrangement is known. The JRG/JT sizingprogram will estimate friction loss if needed.Hs Vertical feet that the liquid is beingmoved above or below the centerline of theeductor. This number will be negative if thefluid is below, or positive if it is above, theeductor.Ps Pressure in the suction vessel inPSIA (Pounds per Square Inch AbSOIUlC . Ifthe vessel is at atmospheric pressure, specifynormal atmospheric pressure at the application site. (Normal pressure at sea level is14.7 PSIA.)

Pvp Vapor pressure of the liquid being

pumped at the highest temperature that itwill be pumped.To calculate for the ~ r p of the motivefluid, change the Pvp to the vapor pressureof the motive fluid and recalculate using allother parameters of the suction conditions.To determine vapor pressure for water, goto a set of steam tables. If the liquid is awater-based slurry or solution, these tableswill generally provide a conservative estimate. For other chemicals the vapor pressurecan generally be obtained from the supplieror a chemical handbook. Estimates can be

used if il is understood that these may causesome problems if the estimated value isIov. er Ihan the actual vapor pressure of theliquid.Sg Specific gravity of the liquid beingpumped.


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IHow to Size Liquid Motive Eductors for Pumping Liquids

2Ft-14 Ft14.6 PSIAJ J PSIA0.978

r-. Ioti\ e LiquidQuantity of Flow AvailablePressure Available (in flowing condition)Specific GravityViscosityTemperatureVapor Pressure at Operating TemperatureSuction LiquidRequired Pumped FlowLift or Head ofLiquidSpecific GravityViscosityTemperatureVapor Pressure al Operating TemperatureOutlet LiquidPressure, Lift or Headfpressure is in outlet head, SpecificGravity of the outlet fluid will be required.

Example:Pumping water at 5 C>F with a suction liftof 14 Ft from the liquid surface to the centerof the eductor.Hf Friction lossHs Liquid LiftP3 Suction Pressure orAtmospheric PressurePvp Liquid Vapor PressureSg Specific GravityCalculation using formula above:2.31 x (14.6 3.73)/0.978 (-14) 2 9.7

NPSHThe suction Hs above (14.6 PSIA x2.31)10.978 will push up 34.5 feet of water in

a column. Therefore, the corrected suctionlift is 9.7 34.5 -24.8 Ft.To find the correct eductor for this application, use -25 Ft of suction lift. Then sizefrom the tables.


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IHow to Size Steam Motive Eductorsfor Pumping Liquids

l7GPM 5Ft

Using Steam Motives to Pump LiquidSuction FluidsTo detennine the correct educlor for a specific application, follow the steps in this section, using the perfonnance tables pages3-4 provided to achieve your desired results.NOTE: All JRG JT tables use the 1 1/2 inchunit as the standard, and educlOfs aTC sized

using a Sizing Factor S.F. based on thisstandard unit.I If the suction fluid is not water, adjust thesuction and outlet head Hs and Hoby multiplying by the specific gravity

of the fluid.2. Find the suction lift Hs that is nC


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SG. HG Steam Pumping liquids 1112 UnNOTM SltAM11 llf.SStML iOnIlPSIGl I I I IS T r j 1- --, SUCQJHW TUt TtMftJl . fJ\JKl _N lm M m M no M m M no M m M m M m M ISO M m M ISO I 10 M, M ., ., ., , M ., ., ., .- ., ., .- .- ,. E M ., ., M ,. .- .- , .- .- 2.2 .- f SIG .- ,. .- .- .-

00 .- , E E ,. E ,. E E ., ., ,. E

-2.2 00

., n n ., n 00

U n 00 n E E E

20 8.9 SIG00 -- I ~ m . m , o7 1 Il o o < h l W ~ . M

fiGH


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IDimensionsModels SL, ML, Hl, SG, HG.t- @ _

@NPT 2

( O P T m ~ L@ t FORPRESSLRE TAPSil ts 1/2 ll iRU 1 1/4 .

STANDARD CAST UNIT0 NP1

1/ 4 0 NPTrOR P l($SURE TAPSIZES 1 IHIW 3 0 NP1

Parts listDESCRIPTION

BODYNOZZLE

ITfM,2

0 NPT

4

OPTIONAL BARSTOCK UNIT

,.__ _ ~ _ _ ~ _ _ _ ...,

~-=JI .

1/4 el l Wi,OR PRESSURC TAPSIIES 1 1/< THRU J

ASSEMBLY Pl/1lt:NS10.\I (TYPICAL I Of/ BOTH UNITS)MO ELS SL WL HL r;, He

OP11l N.O,L(G) NPT ,ORPFSVlilE lAlSIZES 1/2 THllV 1 I I@Nl>r

345

D-RING, NOZZLEDISCHARGEDRING, DISCHARGE

5l , Ml, HL, SG, HG Assembly DimensionsInches mm)

MODEL SIZE A C 0 , , G 4.500 (114) 1.62$ (41) 1.250 (]21 IS) n (15) ,. 31ML HL SG. HG TO5.875 {149} 2000 (51) 1.500 (38) (lO) YO (20) YO IIOL, HL, SG, HG n lS) , 7.125 lSl) 2.250 (57) 1.750 M n (TS) , (2S) , (25) L HL SG. HG (20) .1/. .000 (229) 2.500 64 2.250 (57) (20) 1114 (32) 11/4 32) L HL SG, HG , (25)SL ML, SG, HG. 1-1/2 11.000 (279) 2.7S0 (70) 2500 64 , (25) 2 (40) 2 (40) 11/4 (32) -SL ML SG. HG. , 14.37S (365) 3.125

3.000 (76) 1-1/4 (32) 2 (50) 2 SO1_1/2 (40) -

SL ML SG. HG. 21/2 18.125 (460) 3.500 (89) 4.125 (10S) 1_1/2 (40) 2 2 (65) 21/2 (65) 2 (50) -SL ML HL SG. HG 3 23875 (606) .000 (102) 5000 (127) 2 (50) 3 (80) 3 -OPTIONAL CONNECTIONS FOR MOTIVE, SUCTION AND OUTLET CONNECTIONS

if] li1 llfl IhJ W- ID .FEMALE NPT SOCKET WELD VICTAULIC SIL8RAZE SCH 80 BUTTWELD 15011 FLANGE

NOTE OPTIONAL CONN1:CTlONS WILL INCREASE A. 8. AND/OR CONSULT FACTORY FOR DETAILS.NINI


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I TOCONVERT INTO MUlTIPLY BY TO CONVERT INTO MUlTIPLY BY Jotm emHg 7. joule/em b 22.48otm ft H10 33.9otm in Hg 29.92 Kotm PS 14.7 kiloliter liter 1,000.0 b 2.205Bbot otm 0.9869... kglsq meter 1.020 x 10 L... PS 14.50 liter eu em 1,000.0barrel g. 42 litet 0.03531liter co in 61.02C liter g. 0.2642Centigrade Fahrenheit (C x 915 32

em Hg otm 0.01316 Mem Hg tt H10 0.4461 meter


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.JERGUSON/JACOBYTARBOX

OMstOnS ol heCrarI< Re lar>ce CotporatoonSTRONGSVILLE, OHIO 44136 U.S.A.216) 572-1500 FAX 216) 238--8828

ISO 9001 CERTIFIED

eductor jerguson

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