Design recommendations. for pump stations with vertically installed Flygt axial and mixed flow pumps

Transcription

1 esign ecommendations fo pump stations with vetically installed Flygt axial and mixed flow pumps

2

3 ontents Systems Engineeing Flygt PL and LL pump intoduction Geneal consideations fo pumping station design Pumping station with multiple pumps Pump bay design altenatives Pump station model testing omputational modeling oective measues Installation altenatives Installation components able potection and suspension fo tube installed pumps Installation of pumps Flygt cable seal units fo pessuized tube (column) Appendix 1: ead losses diagams fo Flygt designed dischage aangements Appendix : Submegence diagam fo open sump intake design Appendix 3: Sump layout altenatives Appendix 4: Pump bay altenatives This document is intended to assist application enginees, designes, plannes, and uses of sewage and stom wate systems incopoating Flygt axial and mixed flow pumps installed in a column. A pope design of the pump sump is cucial in ode to achieve an optimal inflow to the pumps. Impotant design equiements to be met ae: unifom flow appoach to the pumps, peventing pe-otation unde the pumps, peventing significant quantities of ai fom eaching the impelle, and tanspot of settled and floating solids. The Flygt standad pump station design can be used as is, o with appopiate vaiations upon eview by Flygt enginees. Pump and sump ae integal to an oveall system that includes a vaiety of stuctues and othe elements such as ventilation systems and solids handling equipment. Opeating costs can be educed with the help of effective planning and suitable opeation schedules. Ou pesonnel and publications ae available to offe guidance in these aeas. Tansient analysis of pump system behavio, such as ai chambe dimensioning, valve selection, etc., should also be consideed in wastewate pump station design. These mattes ae not addessed in this bochue, but we can offe guidance. Please consult ou enginees to achieve optimum pump pefomance, maximum pump life, and a guaantee that poduct waanties ae met. The design ecommendations ae only valid fo Flygt equipment. e assume no liability fo non-flygt equipment.

4 Systems Engineeing Ou Systems Engineeing team offes indepth expetise in the design and execution of compehensive solutions fo wate and wastewate tanspot and teatment. Ou know-how and expeience ae combined with a boad ange of suitable poducts fo deliveing customized solutions that ensue touble-fee opeations fo customes. Ou enginees utilize ou own custom developed compute pogams to povide evaluations fo you specific poject design. Flygt not only can povide assistance with the selection of poducts and accessoies but can povide analysis fo complex systems and/o piping netwoks. e also povide hydaulic guidance and assistance fo flow-elated o heological issues. Assistance can include but is not limited to hydaulic tansient calculations, pump stating calculations, and evaluation of flow vaiations. Additional sevices Optimization of pump sump design fo ou poducts and specific sites Assistance with mixing and aeation specifications and design of appopiate systems System simulation utilizing computational fluid dynamics (F) Guidance fo model testing and oganizing it Guidance fo achieving the lowest costs in opeations, sevice, and installation Specially developed engineeing softwae to facilitate designing Flygt PL and LL pump intoduction Flygt submesible vetically installed axial flow pumps (PL) and mixed flow pumps (LL) have been used in a wide vaiety of stom wate stations and sewage teatment plants, land dainage and iigation systems, fish fams and powe plants, shipyads, amusement paks, and many othe applications whee lage volumes of wate have to be pumped. Flygt submesible PL and LL pumps offe impotant advantages such as: ompact moto and pump unit No sepaate lubication system No extenal cooling system Low opeating sound level Quick connection and disconnection fo installation and inspection Minimal station supestuctue Simple pipe wok Flygt PL and LL pumps ae usually installed in a vetical dischage tube on a suppot flange incopoated in the lowe end of the tube. No anchoing is equied because the weight of the pump is sufficient to keep it in place. The pumps ae equipped with an anti-otation gusset. This aangement povides the simplest possible installation the pump is just loweed into the dischage tube by hoist o cane. Retieval of the pump is equally simple. The ange of sevices is compehensive, but ou philosophy is vey simple: Thee is no substitute fo excellence. Flygt axial flow pumps (PL) Flygt mixed flow pumps (LL)

5 Geneal consideations fo pumping station design The pope design of the pump sump is cucial in ode to achieve an optimal inflow to the pumps. Ideally, the flow at the pump inlet should be unifom and steady, without swil, votices, o entained ai. Non-unifom flow at the pump intake can educe efficiency and cause pulsating loads on the popelle blades, esulting in noise, and vibations. Unsteady flow can also cause fluctuating loads, noise, and vibations. Swil in the intake can change the head, flow, efficiency, and powe in undesiable ways. It can also augment votices. Votices with a coheent coe cause discontinuities in the flow and can lead to noise, vibation, and local cavitation. Votices emanating fom the fee suface can become sufficiently poweful to daw ai and floating debis into the pump. Entained ai can educe the flow and efficiency, causing noise, vibation, fluctuations of load, and physical damage. Expeience with designs aleady in use povides valuable guidelines fo the design of multiple pump stations. Adaptations of existing and well-poven designs can often povide solutions to complex poblems even without model tests. e have extensive expeience based on many successful pojects, and the sevices of ou qualified enginees ae always available. Fo special applications beyond the scope of this bochue, please contact ou local system enginee fo assistance. Pumping station with multiple pumps Multiple pump systems povide geate capacity, opeational flexibility, and inceased eliability, which is why pumping stations ae usually equipped with two o moe pumps. Tansition to the sump, whethe diveging, conveging o tuning, should esult in nealy unifom flow at the sump entance. Obstacles that geneate wakes should not be allowed to intefee with the appoaching flow. igh velocity gadients, flow sepaation fom the walls, and entainment of ai should be avoided. ydaulically, thee zones of the pumping station ae significant: inlet, foebay, and pump bay. Pump bay Foebay Inlet aea Inlet: An inlet conveys wate to the pumping station fom a supply souce such as a culvet, canal, o ive. Usually, the inlet has a contol stuctue such as a wei o a gate. Foebay: The ole of the foebay is to guide the flow to the pump bays in such a way that it is unifom and steady. ecause the inflow to each module should be steady and unifom, the design of the foebay feeding the individual modules is citical and should follow guidelines in this bochue. esign of the foebay depends on wate appoach to the pumping station commonly encounteed as paallel with the sump centeline (the pefeed layout) o pependicula to the sump centeline. Pump bay: In pactice, only the design of the pump bay can be standadized fo a given pump type. A popely designed bay is a peequisite fo coect pesentation of flow to the pumps, but it does not guaantee coect flow conditions. A bad appoach to the pump bay can distub the flow in the pump intake. As a ule of thumb, the appoach velocity to the individual pump bays should not exceed.5 m/s (1.64 ft/s). The dimensions of the bay s individual modules ae a function of pump size and the flow ate (see Appendix 4).

6 Font wide inlet to the station hen wate appoaches the station fom a wide supply souce such as a culvet o canal, the pumps should be placed symmetically to the inlet centeline without changing diection of the appoaching flow. If the width of the inlet is less than the total width of the pump bays, the foebay should divege symmetically. The total angle of divegence should not exceed fo the open sump intake design o 4 fo the fomed intake design. The bottom slope in the foebay should not be lage than 1 (See Appendix 3). If these paametes cannot be met, flow diection devices should be used to impove the flow distibution. Such aangements and moe complex layouts should be investigated using model tests in ode to aive at suitable designs. igh level font inlet igh font inlet o side inlet to the station hen the inlet to the station is located at highe level o pependicula to the axis of the pump bays, an inlet chambe o oveflow-undeflow wei can help to edistibute the flow. A substantial head loss at the inlet aea is equied to dissipate much of the kinetic enegy fom the incoming flow. Altenatively, baffle systems can be used to ediect the flow, but model tests ae then equied to detemine thei coect shape, position, and oientation. The distance between the wei o baffles and the pump bays must be sufficient to allow eddies to dissipate and entained ai to escape befoe the wate eaches the pump inlet (See Appendix 3). igh level side inlet Low level side inlet ulvet o canal inlet

7 Pump bay design altenative: Enclosed intake design The enclosed intake design is the least sensitive to distubances of the appoaching flow that can esult fom diveging o tuning flow in the foebay, o fom single pump opeation at patial load. Theefoe, the enclosed intake design is nealy always the pefeed choice and ecommended fo stations with multiple pumps with vaious opeating conditions. Pump bay design altenative: Open sump intake design The open sump intake design is the most sensitive to nonunifom appoaches. If used fo moe than thee pumps, the length of the dividing walls should be at least /3 of the total width of the sump. If flow contaction occus nea the sump entance because of sceens o gates, the sump length should be inceased to 6 o moe, depending on the degee of contaction. one fillets Enclosed suction intake one fillets ividing wall ividing wall Enclosed intake design in concete Flow staightening vane (splitte) L-shaped flow staightening vane (splitte) Open sump intake design fo Flygt LL pumps one fillets Enclosed suction intake one fillets ividing wall ividing wall Enclosed intake design in steel Flow staightening vane (splitte) The enclosed intake design can be constucted in eithe concete o steel. The intake educes distubances and swil in the appoaching flow. The inclined font wall pevents stagnation of the suface flow. Geometical featues of the intake povide smooth acceleation and tuning as the flow entes the pump. The minimum inlet submegence should not be less than nominal diamete (). L-shaped flow staightening vane (splitte) with cone Open sump intake design fo Flygt PL pumps The open sump intake design includes devices such as flow staightening vanes (splittes) that alleviate the effects of mino asymmeties in the appoaching flow. The minimum equied submegence of the pump inlet with open sump intake design is a function of the flow ate, the pump inlet diamete and the distibution of the flow at the appoach to the pump. Minimum submegence diagams ae shown in the Appendix.

8 Each diagam has thee cuves fo vaious conditions of the appoaching flow. ecause votices develop moe eadily in a swiling flow, moe submegence is equied to avoid votices if the inlet aangement leads to distubed flow in the sump. ence, the uppe cuve in the submegence diagams is fo a pependicula appoach, the middle one is fo a symmetical appoach, and the lowest cuve is fo dutylimited opeation time (about 5 hous/yea). The cuve appopiate to the inlet situation should be used to detemine the minimum wate level in the sump to peseve eliable opeation of the pumps. Pump station model testing ydaulic models ae often essential in the design of stuctues that ae used to convey o contol the flow distibution. They can povide effective solutions to complex hydaulic poblems with unmatched eliability. Thei costs ae often ecoveed though impovements in design that ae technically bette and yet less costly. Model testing is ecommended fo pumping stations in which the geomety diffes fom ecommended standads, paticulaly if no pio expeience with the application exists. Good engineeing pactice calls fo model tests fo all majo pumping stations if the flow ate pe pump exceeds.5 m 3 /s (4, GPM) o if multiple pump combinations ae used. Tests ae paticulaly impotant if: Sumps have wate levels below the ecommended minimum submegence Sumps have obstuctions close to the pumps Sumps ae significantly smalle o lage than ecommended (+/- 1%) Multiple pump sumps equie baffles to contol the flow distibution Existing sumps ae to be upgaded with significantly geate dischages. Model testing can also be employed to seek solutions to poblems in existing installations. If the cause of a poblem is unknown, it can be less expensive to diagnose and emedy with model studies athe than by tial and eo at full scale. The pump manufactue s involvement is often equied in the evaluation of the esults of model tests. Expeience is equied to detemine whethe the achieved esults ae satisfactoy and will lead to pope oveall opeation. e can offe guidance egading the need fo model tests and assist in thei planning, aangement and evaluation. omputational modeling omputational fluid dynamics (F) analysis has the potential of poviding fa moe detailed infomation of the flow field at a faction of cost pe time needed fo the model tests. It has been moe and moe accepted as a tool in station design in combination with compute-aided design (A) tools. It is possible to obtain a moe efficient method fo numeical simulation of station design utilizing F. It offes inceased qualitative and quantitative undestanding of pumping station hydaulics and can povide good compaisons between vaious design altenatives. oweve, the possibilities of F should not be oveestimated. ifficult cases ae encounteed whee fee suface effects ae impotant. Also, a phenomenon like ai entainment is difficult to captue with F analysis. oth model tests and F have advantages and disadvantages that need to be evaluated in each individual case. e can advise on a good combination between model tests and F. A model of a pumping station usually encompasses a epesentative potion of the headace, the inlet stuctue, the foebay, and the pump bays. The dischage potion of the flow is seldom included. Testing may encompass the following flow featues and design chaacteistics: Inlet stuctue: flow distibution, votex fomation, ai entainment, intusion of sediment and debis. Foebay and pump bays: flow distibution, mass swil, suface and bottom votices, sediment tanspot. Opeating conditions: pump duty modes, stat and stop levels, pump down pocedues.

9 oective measues The designs descibed in this bochue have been poven to wok well in pactice. oweve, in some applications pehaps due to limitations of space, installation of new pumps in old stations, o difficult appoach conditions not all the equiements fo a good, simple design can be met. Sometimes, fo example, it may be impossible to povide adequate submegence so that some votexing o swil may occu. oective measues must then be undetaken to eliminate the undesiable featues of the flow, paticulaly those associated with excessive swil aound the pump tube, with ai-entaining suface votices and with submeged votices. Swil aound the pump tube is usually caused by an asymmetical velocity distibution in the appoach flow. ays should be sought to impove its symmety. Subdivision of the inlet flow with dividing walls, and the intoduction of taining walls, baffles, o vaied flow esistance ae some options that may achieve this esult. Altenatively, a eduction of the flow velocity, fo example, by inceasing the wate depth in the sump, can help to minimize the negative effects of an asymmetical appoach. pump o fom eosion of the popelle blades. They can be eliminated by distubing the fomation of stagnation points in the flow. The flow patten can be alteed, fo example, by the addition of a cente cone o a pismatic splitte unde the pump, o by insetion of fillets and benching between adjoining walls, as in some of ou standad configuations. Ai-entaining votices may fom eithe in the wake of the pump tube o upsteam fom it. They fom in the wake if the inlet velocity is too high o the depth of flow is too small. Also, they fom upsteam if the velocity is too low. In eithe case, these votices can be eliminated by intoducing exta tubulence into the suface flow, i.e. by placing a tansvese beam o baffle at the wate suface. Such a beam should ente the wate at a depth equal to about one quate of the tube diamete and be placed at a point about. diametes upsteam of the tube. If the wate level vaies consideably, a floating beam can be moe effective. In some cases, a floating aft upsteam of the tube will eliminate ai-entaining votices. This aft may be a plate o a gid. oth foms impede the fomation of suface votices. An altenative is the use of an inclined plate simila to that shown in the daft tube installation.. ack wall and floo splitte plates. Suface baffle fo votex suppession /4 ack wall votex caused by floo splitte only. Relatively small asymmeties of flow can be coected by the insetion of splitte plates between the pump tube and the back wall of the sump and undeneath the pump on the floo. These plates block the swil aound the tube and pevent fomation of wall votices. These measues ae integal featues in most of ou standad configuations. Submeged votices can fom almost anywhee on the solid bounday of the sump and they ae often difficult to detect on the site. oweve, they can be detected much moe eadily in model tests. Submeged votices' existence may be evealed by the ough unning of the Floating aft o votex beake gid

10 Installation altenatives The following examples show possible altenatives using Flygt designed installation components. Installation type 1 Installation type 3 Suitable fo pumping liquid to a eceiving body of wate with small level vaiations o whee a shot unning time can be expected, so non-etun valves ae not equied. This aangement is simple. It involves the least possible numbe of steel components. The pump is set in a cicula concete shaft with a elatively shot tube gouted in place, installation component 3, which is used as the suppot stuctue fo the pump. Altenatively, the shaft can have a ectangula coss-section above the dischage column. The shaft extends above the maximum wate level in the outlet channel to pevent wate fom unning back to the sump when the pump is shut off. This aangement may be used with eithe a fee dischage, when liquid is pumped to a eceiving body of wate with small wate level vaiations, o with a flap valve, when the wate level on the outlet side vaies consideably so that the outlet is occasionally submeged. The flow is dischaging into a closed culvet though the component E1. Installation type 4 Installation type An altenative to the concete shaft is to place the pump in a steel column with a colla that ests on a suppoting fame (installation component 1). The top of the pipe must extend sufficiently above the maximum wate level to pevent back-flow fom the outlet channel. This aangement is suitable wheneve the liquid is pumped to a eceiving body of wate with a vaying wate level. The outlet is equipped with a flap valve to pevent back-flow. hen the pump is not in opeation, the valve closes automatically, peventing wate fom unning back into the sump. The static head is the diffeence between wate level in the sump and wate level at the outlet, and it will be kept to a minimum in this type of installation. Elbow type E4 can be used fo dischaging.

11 Installation type 5 This easy-to-install elbow constuction allows pumps to wok in combination with a siphon o dischage line. hen outlet is submeged, a siphon beaking valve is equied to pevent back-flow and allow venting at stat. This installation keeps the static head to a minimum, since the static head will be the diffeence between the wate level in the sump and the wate level at the outlet. Two types of elbows can be used with this station E4. As in pevious cases, the steel tube ests on a suppot fame (installation component 1). Note: Suppot backet (1) should be used if the fee unsuppoted length of the column pipe exceeds 5 times pipe diamete.

12 Installation components The objective in the design and development of installation components is to devise simple systems that offe a wide vaiety of options to deal with most situations. These components have been developed to facilitate design wok and estimation of costs. Nomally, the installation components will be manufactued locally based on Flygt dawings. The dawings can also seve as a basis fo the development of new o modified components that bette match the local equiements and/o manufactuing facilities. awings ae available fo the following installation components: Flygt Fomed Suction Intake (Flygt FSI) is pefeable fo vey advese inflow conditions o when the pump bay dimensions ae less than ecommended. The main function of the intake device is to peseve an optimal inflow to the pump by gadual acceleation and ediection of the flow towad the pump inlet. Flygt FSI Vetical dischage column () in which the pump is set depending upon the depth of the station, the installation may consist of one pat (1) o seveal pats joined togethe by flanges (), o it may consist of a shot tube pepaed fo gouting in concete (3). 1 3 ischage elbows (E) with ectangula exit flange (E1) and dischage elbows with cicula exit flanges (, E3). E1 E3 ove () fo dischage elbow (E1 and ). olumn backet () fo anchoing the tube. Suppoting fame (F) fo suspending the tube fom ceiling. F

13 able potection and suspension fo tube installed pumps Fo tube-installed submesible pumps, pope cable potection and suspension is essential fo toublefee opeation. able suspension and potection equiements become moe stingent with longe cable lengths and highe dischage velocities. Installation of pumps Pump installation can be facilitated with the aid of the ock-lock device fo easy and safe etieval of pumps in a wet well. The ock- Lock consists of a sping-loaded hooking device, a guide line, and a tension dum. ecause the line guides the hook, thee s no time wasted tying to find the pump shackle. The device ensues that the hook actually locks into the shackle. Pumps ae etieved safely, easily, and quickly, with minimal maintenance costs. Flygt cable seal units fo pessuized tube (column) Flygt cable suspension system A few basic pinciples goven good cable potection and suspension pactices: ables must be suspended in such a way that if they should move, they will not come in contact with any sufaces that could abade the jacket these include pump and tube components, as well as othe cables. ables should be bundled togethe, using components that will not cut o abade the cables. Pope stain elief and suppot at pescibed intevals (depending on length) should be povided. Sping-contolled tensioning and an integated guide wie ae ecommended fo long cable lengths. e offe a vaiety of cable potection and suspension accessoies with ecommendations to suit all types of installations and unning conditions. ontact you local application enginee fo infomation on the best system to meet you needs. The Flygt cable seal units with Roxtec sealing technology ae used to make a wate tight cable enty into a dischage column with wate tight cove. The cable seal units ae complete with fame, Roxtec cable seal modules, tightening wedge, lubicant, and installation manual.

14 Appendix 1: ead losses diagams fo Flygt designed dischage aangements Appendix 1: ead losses diagams fo Flygt designed dischage aangements ead losses ae compaatively small fo systems using popelle pumps. Even so, an accuate pediction of losses, and hence the total equied head, is cucial when selecting the best pump. Popelle pumps have elatively steep head and powe chaacteistics, and an eo in pedicting the total head can esult in a significant change in the powe equied. A potentially vulneable situation can aise if head loss is significantly undeestimated, which can mean that a pump opeates against a highe head, delives less flow, and uses moe powe. onsevative assumptions should thus be made in detemining head loss calculations. Fo all installations descibed heein, the head losses that must be accounted fo occu in the components of the dischage aangement (fiction losses in shot pipes ae usually negligible). The loss coefficients and the head loss as a function of the flow ate fo the system components designed by Flygt ae shown in the diagams. Fo system components not coveed by this document, loss coefficients can be obtained fom thei manufactues o fom appopiate liteatue. 4 mm Installation pipe inne diamete () Flygt PL E1 =4 K=.45 E5 =6 K=.37 E5 =8 K=.35 E5 =1 K=.34 E5 =1 K=.33 E1, E = Q K g out=35 K1=1.41 out=4 K1=1.13 out=35 K=.85 out=4 K=.77 K1: Shap bend = o K: Smooth bend >.1 o 3 E1 S S=Static head =ead loss E5 Side 4 48 S=Static head o S E5 Top =ead loss E3, E4.4 E4 out=35 K=.6 E3 out=35 K=.55 E4 out=4 K=.35 E3 out=4 K=.3 E3 o E4 o

15 Appendix 1: ead losses diagams fo Flygt designed dischage aangements 5 mm Installation pipe inne diamete () Flygt PL73 55 mm Installation pipe inne diamete () Flygt PL735 E1, E5 E1, E5 E1 E1 =5 K=.45.8 E5 =75 K=.37 S=Static head.8 =ead loss E5 =1 K=.35.7 E5 =15 K=.34 S.7 E5 =15 K= = Q 3.5 K g.5 = E1 =55 K=.45 E5 =85 K=.37 E5 =11 K=.35 E5 =1375 K=.34 E5 =165 K=.33 Q K g 3 E1 S S=Static head =ead loss E5 Side E5 Top E5 Side E5 Top.. S S S=Static head =ead loss S=Static head 5 6 =ead loss out=45 K1=1.35 out=5 K1=1.13 out=45 K=.83 out=5 K=.77 o.8 out=5 K1=1.33 out=55 K1=1.13 out=5 K=.8 out=55 K=.77 o.6 K1: Shap bend = o K: Smooth bend >.1 o.6 K1: Shap bend = o K: Smooth bend >.1 o E3, E4 E3, E4.4 E4 out=45 K=.53 E3 out=45 K=.49 E4 out=5 K=.35 E3 out=5 K=.3 E3 o E4 o.3 E4 out=5 K=.51 E3 out=55 K=.47 E4 out=5 K=.35 E3 out=55 K=.3 E3 o E4 o

16 Appendix 1: ead losses diagams fo Flygt designed dischage aangements 6 mm Installation pipe inne diamete () Flygt PL74 7 mm Installation pipe inne diamete () Flygt PL745, PL75 E1, E5 E1, E = E1 =6 K=.45 E5 =9 K=.37 E5 =1 K=.35 E5 =15 K=.34 E5 =18 K=.33 Q K g 3 E1 S S=Static head =ead loss = E1 =7 K=.45 E5 =15 K=.37 E5 =14 K=.35 E5 =175 K=.34 E5 =1 K=.33 Q K g 3 E1 S S=Static head =ead loss E5 Side E5 Top 6 7 S S=Static head =ead loss E5 Side E5 Top 7 84 S S=Static head =ead loss out=5 K1=5 out=6 K1=1.13 out=5 K=.99 o out=6 K= K1: Shap bend = o K: Smooth bend >.1 o out=5 K1=.55 out=5 K= out=6 K1=1.45 out=7 K1=1.13 out=6 K=.9 out=7 K=.77 K1: Shap bend = o K: Smooth bend >.1 o o E3, E4 E3, E4.6.5 E4 out=5 K=.73 E3 out=5 K=.66 E4 out=6 K=.35 E3 out=6 K=.3 E3 o E4 o.3 E4 out=5 K=1.34 E3 out=5 K=1.3 E4 out=6 K=.65 E3 out=6 K=.59 E4 out=7 K=.35 E3 out=7 K=.3 E3 o E4 o

17 Appendix 1: ead losses diagams fo Flygt designed dischage aangements 8 mm Installation pipe inne diamete () Flygt PL755, PL761, PL765, LL mm Installation pipe inne diamete () Flygt LL34 E1, E5 E1, E = E1 =8 K=.45 E5 =1 K=.37 E5 =16 K=.35 E5 = K=.34 E5 =4 K=.33 Q 3 E1 S S=Static head =ead loss = E1 =9 K=.45 E5 =135 K=.37 E5 =18 K=.35 E5 =5 K=.34 E5 =7 K=.33 Q 3 E1 S S=Static head =ead loss.6 K g.4 K g.4. E5 Side 8 96 S E5 Top.3..1 E5 Side 9 11 S E5 Top S=Static head =ead loss S=Static head.7.8 =ead loss out=6 K1=.15 out=7 K=1.6 out=8 K1=1.41 out=6 K1=1.13 out=7 K=.85 out=8 K=.77 K1: Shap bend = o K: Smooth bend >.1 o o.3. out=7 K1=1.9 out=8 K1=1.38 out=7 K=1.37 out=9 K1=1.13 out=8 K=.84 out=9 K=.77 K1: Shap bend = o K: Smooth bend >.1 o o E3, E4 E3, E E4 out=6 K=1.11 E3 out=6 K=1.1 E4 out=7 K=.6 E3 out=7 K=.55 E4 out=8 K=.35 E3 out=8 K=.3 E3 o E4 o.15 E4 out=7 K=.96 E3 out=7 K=.87 E4 out=8 K=.56 E3 out=8 K=.51 E4 out=9 K=.35 E3 out=9 K=.3 E3 o E4 o

18 Appendix 1: ead losses diagams fo Flygt designed dischage aangements 1 mm Installation pipe inne diamete () Flygt PL776, PL781 1 mm Installation pipe inne diamete () Flygt PL711, PL715, LL3531, LL36 E1, E5 E1, E = E1 =1 K=.45 E5 =15 K=.37 E5 = K=.35 E5 =5 K=.34 E5 =3 K=.33 Q 3 E1 S S=Static head =ead loss = E1 =1 K=.45 E5 =18 K=.37 E5 =4 K=.35 E5 =3 K=.34 E5 =36 K=.33 Q 3 E1 S S=Static head =ead loss K g K g E5 Side 11 S E5 Top.6.4. E5 Side 1144 S E5 Top S=Static head =ead loss S=Static head =ead loss out=8 K1= out=9 K1=1.35 out=8 K=1. o 1. out=1 K1= out=9 K=.83.9 out=1 K= K1: Shap bend = o.7.4 K: Smooth bend >.1.6 o out=1 K1=1 out=1 K1=1.13 out=1 K=.99 out=1 K=.77 K1: Shap bend = o K: Smooth bend >.1 o o E3, E4 E3, E E4 out=8 K=.85 E3 out=8 K=.78 E4 out=9 K=.53 E3 out=9 K=.49 E4 out=1 K=.35 E3 out=1 K=.3 E o E4 o E4 out=1 K=.73 E3 out=1 K=.66 E4 out=1 K=.35 E3 out=1 K= E3 o E4 o

19 Appendix 1: ead losses diagams fo Flygt designed dischage aangements 14 mm Installation pipe inne diamete () Flygt PL7115, PL711, PL715 E1, E = E1 =14 K=.45 E5 =1 K=.37 E5 =8 K=.35 E5 =35 K=.34 E5 =4 K=.33 Q K g 3 E1 S S=Static head =ead loss E5 Side E5 Top.4 S S=Static head =ead loss out=1 K1=1.45 out=14 K1=1.13 out=1 K=.9 out=14 K=.77 K1: Shap bend = o K: Smooth bend >.1 o o E3, E4.8.7 E4 out=1 K=.65 E3 out=1 K=.59 E4 out=14 K=.35 E3 out=14 K=.3 E3 o E4 o

20 Appendix : Submegence diagam fo open sump intake design Appendix : Submegence diagam fo open sump intake design The minimum equied submegence of the pump inlet with open sump intake design is a function of the flow ate, the pump inlet diamete, and the distibution of the flow at the appoach to the pump. Each diagam has thee cuves fo vaious conditions of the appoaching flow. ecause votices develop moe eadily in a swiling flow, moe submegence is equied to avoid votices if the inlet aangement leads to distubed flow in the sump. ence, the uppe cuve in the submegence diagams is fo a pependicula appoach, the middle one is fo the symmetical appoach, and the lowest cuve is fo duty-limited opeation time (about 5 hous/yea). The cuve appopiate to the inlet situation should be used to detemine the minimum wate level in the sump to peseve eliable opeation of the pumps Flygt LL385, LL/NL Flygt LL/NL317 Note: NPS equied fo specific duty point may supesede submegence equiements. 1. Lateal appoach Symmetical appoach Limit of opeation (5 hous/yea) Flygt LL/NL

21 Appendix : Submegence diagam fo open sump intake design Flygt LL31 Flygt LL Flygt LL/NL33 Flygt LL Flygt LL

22 Appendix : Submegence diagam fo open sump intake design Flygt PL317 Flygt PL Flygt PL7 Flygt PL Flygt PL73 Flygt PL745, PL

23 Appendix : Submegence diagam fo open sump intake design Flygt PL755, PL761, PL765 Flygt PL711, PL Flygt PL776, PL Flygt PL711, PL

24 Appendix 3: Sump layout altenatives Appendix 3: Sump layout altenatives Stations with low level font inlet Stations with high level font inlet (max 4 pumps) A A.L. A A max 1 Vmax=.1m/s (ft/s).75.75p.75 P A Vmax=1.m/s (3ft/s) to avoid sedimentation Vmax=.3m/s (1ft/s) A Vmax=1.7m/s (5ft/s) Stations with low level side inlet (max 4 pumps) A A.75P A P Vmax= 1.m/s (4ft/s).5P ~ 1 (max ) max max(/3 o L).L. Vmax=.5m/s (ft/s) A Stations with high level side inlet (max 4 pumps) A A P max(/3 o L) 1.5P P Vmax= 1.7m/s (5ft/s) min 1.5P min 3 max (/3 o L) 3 max (/3 o L)

25 Appendix 4: Pump bay altenatives Appendix 4: Pump bay altenatives Enclosed intake in steel fo Flygt PL pumps Enclosed intake in concete fo Flygt PL pumps A A G A A G 6 max.l. max.l. min.l. S M N P min.l. 6 S M P A A L min J K F Splitte L min J K F E E Splitte E A A A A E E Recommended dimensions Fomed Intake esign Pump type Nom. dia (mm) E F G J K L M P S PL PL PL PL PL745 PL75 PL755 PL PL PL776 PL PL PL PL PL

26 Appendix 4: Pump bay altenatives Flygt FSI A A A A Open sump design fo Flygt PL pumps A A A A max.l. min.l. min.l. S M S L A P N L M J K E Splitte with cone A A E E A Recommended dimensions Flygt FSI Open sump intake design Pump type Nom. dia (mm) E F G J K L M N P S PL745 PL PL755 PL PL PL776 PL PL PL PL PL PL PL PL PL317 PL74 PL745 PL75 PL755 PL761 PL765 PL776 PL781 PL711 PL715 PL711 PL See minimum submegence diagam.8

27 Appendix 4: Pump bay altenatives Open sump design fo Flygt LL pumps A A max.l. P S P E J x E Splitte A E E A Recommended dimensions Open sump intake design Pump type LL385 LL/NL31 LL/NL317 LL315 LL31 LL/NL33 LL3356 Nom. dia (mm) E F G J K L M N P S LL LL See minimum submegence diagam 1.

28 Xylem 'zīl m e 1) The tissue in plants that bings wate upwad fom the oots; ) a leading global wate technology company. e e 1, people unified in a common pupose: ceating innovative solutions to meet ou wold s wate needs. eveloping new technologies that will impove the way wate is used, conseved, and e-used in the futue is cental to ou wok. e move, teat, analyze, and etun wate to the envionment, and we help people use wate efficiently, in thei homes, buildings, factoies and fams. In moe than 15 counties, we have stong, long-standing elationships with customes who know us fo ou poweful combination of leading poduct bands and applications expetise, backed by a legacy of innovation. Fo moe infomation on how Xylem can help you, go to F esign Recommendations VetAxial and MixedFlow 4/15 NAT Xylem, Inc South idge icle halotte, N 873 Tel Fax XYL-O1 ( ) Flygt is a tademak of Xylem Inc. o one of its subsidiaies. 15 Xylem, Inc. APR 15