SEMA®

Side channel pumps PN 25 (40)Glandless because of magnetic drive

SEMA-S for extremely low NPSH valuesSEMA-L with reference to DIN EN 734SEMA-Z with reference to DIN EN 734SEMA-Block in closed-coupled design

Technical description

DesignHorizontal, self priming, hand-ling areated liquids, single- ormulti-stage execution, gland-less with magnetic drive. Thehydraulic of the SEMA con-sists of interchangeablestandardized components of our standard programme.

Advantagesof the glandless, self primingside channel pumps of mul-tistage element housing de-sign for the transport ofsolid-free media:

● they are maintenance free

● they produce vacuum inthe pipeline and are there-fore selfpriming.For reasons of safety andaccessibility they can beinstalled above the fluidcontainer

● they have the ability totransport fluids with up to50% gas or vapour con-tent i.e. low-boiling sub-stances like liquified gas

● they are insensitive to ca-vitation caused by varia-ble vapour pressure( in the case of partial de-gassing the output is notinterrupted)

● they are available at favou-rable prices bec. of smalloutput quantities (up to about12m3/h) and relative-ly high pressures (above15Mlc upto about 250 Mlc)

● robust, compact castingexecution

● extremely low NPSH va-lues and low pressurefluctuation

● a standard modularsystem providing:- good replaceability

because few spare parts- easy to assemble- minimum dead space- use of identical parts for

different constructionsizes and shapes

Technical dataQ: up to 20m3/ hH: up to 250 M lct: from -40 to +200°Cp: up to PN 25 (40)Viscosity: > 0.3 m.Pas up to

200 m.Pasn: 1450 1/min (50 Hz)

1750 1/min (60 Hz)direction of rotation: left(counter clockwise)

Static breaking moment atroom temp.: up to 168 Nm

Description of themagnetic driveThe permanent magneticcoupling of the SEMA gua-rantees that the whole pum-ping system is completelysealed and serves to providecontact-free torque trans-mission between the pumpand drive. The correct choiceof magnetic coupling for themoments of inertia of all rota-ting parts of the unit guaran-tees a safe start of the SEMAwithout the danger of break-down. The unavoidable eddycurrent losses and hydrauliclosses occuring in operationare relatively small. For safeoperation circulation of theproduct is necessary whichis provided for the SEMA in-ternal to the pressure casingof the pump in the region ofthe magnetic coupling.

The SEMA must never berun in a dry state !

When conveying low-boilingliquids, the operating pres-sure and temperature mustbe chosen so that materialcannot vaporise.

The inner and outer rotors ofthe magnetic coupling al-ways run synchronously. Inthe case of a possible break-down, the pump is switchedoff and after successful syn-chronisation (only possible ina stationary state ) the SEMAcan be started again.

Spinning the coupling doesnot cause demagnetisationof the magnet.

ApplicationsConveying environmentallypolluting substances such as:● Acids● Alkaline solutions● Hydrocarbons● Solvents● Liquid gases● RefrigerantsDeployment:● Chemical industry● Refrigeration● Liquid gas installations● Electroplating● Tank installation building● Vacuum technology● Extraction plantsSpecial safety requirementsare demanded of pumpswhich convey dangeroussubstances. The S E M Agives this safety. Our pumpscan handle without leakage:- all clear and turbid liquids- substances containing gas

or giving off vapour quickly- corrosive and toxic

substancesIncreasing environmentalawareness and more strin-gent requirements concer-ning the integrity of pumpsdemand technology of highquality. Our pumps are instal-led everywhere where it isimportant that the sub-stances being transportedshould not contact the envi-ronment.

Construction1. CasingsSuction and discharge ca-sings as well as suction anddischarge stage casings havea transverse spacing. The sea-ling of the casings occurs bymeans of stage gaskets.2. ImpellersOpen, star-shaped impellerswith axial thrust compensationthrough balancing boreholes.For SEMA-S an additional ra-dial centrifugal pump impellerfor achieving low NPSH va-lues.3. ShaftThe pump is equiped with aspecial shaft resistant to ben-ding, that provide for a troublefree run at all load phases.4. Bearing and lubricationDie outlying deep-groove ball

bearings are filled with an en-durance grease filling and aretherefore free of maintenance.A relubrication of the closedbearings is not intended.Alternative an execution withoil lubrication is available.5. DriveThe pumps are driven by anelectric motor acc. to IEC-standard.6. Separation ChamberIt separates the product spacefrom the atmosphere. Throughit the torque is transmittedthroughout by means of theaction of the magnetic force.7. Inner RotorThe magnets are fixed firmly tothe support and as a protec-tion against chemical attackare hermetically sealed(MPPT: micro plasma pulsetechnique)8. Outer RotorThe number of magnetic pie-ces varies according to theforce to be transmitted. Aneconomical use of the mag-netic volume is guaranteed.9. The Magnetsare made of high grade Neo-dym.10. Slide BearingIt is formed from a combina-tion of axial and radial bea-rings. It is hydrodynamicallyrelieved and medium lubrica-ted. For this reason it is provi-ded with oiling grooves.

The slide bearing is manu-factured from wear-resistant,solid silicon carbide or fromgraphite. Mechanical safety isguaranteed by shrinking thesilicon carbide parts into metalbearing housings.

Should it nevertheless fall, thisconstruction holds the biggerbroken pieces together andtherefore remains operationalto a limited extent. Additionalslide bearings in the interme-diate stage made from gra-phiteloaded PTFE material, providefor the absorption of the radialforces and guarantees thetrouble-free insertion of thepumps in the region of thecharacteristic.

2

material material code12 62 32

casing GG-25 GGG-40.3 1.4408stage casing GG-25 GGG-40 1.4470side channel casing GG-25 GGG-40 1.4470foot GGG-40 GGG-40 GGG-40shaft 1.4021 1.4021 1.4571impeller 1.4059 1.4059 1.4581suction impeller 1.4581 1.4581 1.4581sleeve bearing (magnetic drive) 1.4462 / SiSiC 1.4462 / SiSiC 1.4462 / SiSiCbearing bracket C 35 C 35 C 35bearing yoke St 52 St 52 St 52gasket PTFE PTFE PTFEshaft sleeve SiSiC SiSiC SiSiCbearing bush carbon carbon carbonseparation chamber / flange 1.4571/1.4571*) 1.4571/1.4571*) 1.4571/1.4571*)tie bolt St 60 k St 60 k St 60 k

*) also in 2.4610 / 1.4571 or 2.4610 / 2.4610 available

3

Materials

material code number designation acc. to standard

0.6025 GG-25 (cast iron)

0.7043 GGG-40.3 (ductile iron)

1.4021 X 20 Cr 13

1.4059 G - X 22 CrNi 17

1.4470 G - X 2 CrNiMoN 22 53

1.4408 G - X 6 CrNiMo 18 10

1.4571 X 6 CrNiMoTi 17 12 2

1.4581 G - X 5 CrNiMoNb 19 11 2

Explantion of the most important material code numbers

SEMA-S:Glandless side channel pumpwith connected impeller andaxial supports for the achie-vement of extremely lowNPSH values with permanentmagnetic drive

The special characteristic of the SEMA glandless, selfpri-ming, lateral channel pump is the permanent magnet syn-chronous coupling. The magnetic coupling ensures thatdangerous materials are able to remain where they belong:inside the circulation system.

4

SEMA® - re

mains

completely sealed

Its advantage is the high operational safety of the SEMA since:● the lateral channel pump copes with a possible two phase

flow (fluid-gas mixture)● magnetic coupling presents a simple overload protection

system for the drive

5

6

Pump description

SEMA

1

-S

2

11

3

2.

4

S 2

5

F.

6

H.

7

75-2

8

N /

9

32

10

3 Size range

5 Bearing

4 number of stages (1-8 regular , the last figure states the side channel number of stages; SEMA-S has aradial impeller in addition)

7 Separation Chamber

6 execution of antifriction bearing O = oil / F = grease

8 Magnet size MAK 75, MAK 110, MAK 135 - size of the magnetic pieces

9 Cooling / HeatingN: < 120° C K: ≥ 120° C up to 200° C X: additional heating / cooling

● at the separation chamber ● in the suction casing ● through intermediate stage (not available for 550 series in 32)

Because of casing-, separation chamber- and intermediate stage heating a full heating of the pump is gi- ven. The three heating systems can be used singly or in combination. As heating medium steam, thermal fluid or other media can be used. In the same way the heating arrangements can also be used for cooling.

Performance regionNominal widthSEMA-L SEMA-S

DN DNA DNR m3/h Mlc kWSize range

110220330440550

2032324050

40656580100

2032324050

2,44,57,5

12,020,0

215315350270300

4,07,0

10,017,524,0

Inside the pump inside the separation chamber

S 2 carbon SiC / SiC (SIC pressureless sintered)

75 32,4 29,5 27,7 25,9V 1.4571 1.4571 110 20,9 19,1 17,9 16,7

75 40,0 40,0 39,7 37,6H 1.4462 2.4610 110 29,0 27,0 25,7 24,3

135 29,1 27,3 26,3 25,4

10 Materials12: grey iron castingGG 25 (0.6025) 32: high grade steel (1.4408) 62: spheroidal casting GGG 40.3 (0.7043)

Other materials on request

Material combination size max. working pressure in bar at tflange separation coupling 20° 100° 150° 200°

chamber

1 side channel pump PN 25, self priming, glandless because of magnetic drive

2 L = standard pump body in accordance with DIN EN 734, left handed, pressure connection at the driving side.S = with NPSH preliminary stage, axial pump intake, left handed, pressure connection at the driving side. Z = standard pump body in accordance with DIN EN 734, right handed, pressure connection at the suction side.Block = as SEMA-S, -L or -Z in closed coupled design (in size 110-330, 1-8 stages)

SEMA-Z

7

1) For working tA ≤ 25° C, for viscosity v ≤ 1 m Pas, for rotation n = 1450 1 / min, and separation chamber madefrom 1.4571. Ask us about transmission power for higher temperatures, viscosities and rotation speeds.

Explanation of SymbolsPMA = maximum transmission power of permanent magnet couplings; PJMA = power dissipation of permanentmagnet couplings; PM = maximum power input; Pmax. adm. = maximum allowable power demand of pump.

Double skinned separation chamber

For a higher degree of safety and with the possibility ofmonitoring the pump can be provided with a doubleskinned separation chamber.This double skinned separation chambers consists oftwo separation chambers lying one inside the other.

The space between the two separation chambers caneither be used for circulation (cooling/heating) or forpressure monitoring. It is thus guaranteed that in thecase of possible damage to the inner or outer separa-tion chambers an alarm will be operated before a lea-kage can take place.

Both separation chambers are suitably dimensionedwith respect to the outside pressure offering altogethera higher degree of safety.

Temperature Monitoring

Monitoring of the separation chamber during operationcan be effected relatively simply by means of tempera-ture sensors (PT 100) or pressure monitoring instru-ments. The signal analysis can be provided locally or ata central control point whereby an alarm and / or a shutdown of the SEMA can be triggered.

Dry-run and overload detector

The dry-run and overload detector monitors the systemby means of the phase angel method. The detector isswitched directly into the motor circuit and measuresthe angel of phase difference between motor currentand voltage, that is used for the determination of themotor load.At a reduction of the motor load for example throughdry-run or closed suction pipe or at a motor load in-crease for example through exceeding the man, heador closed discharge pipe - a relay is picked up, that mayserve for switching off the pump or trigger an alarm.

Further special designs on request.

Safety system - Special designs

Combination of magnetic drives

permanent magnet coupling

PMA1) kW

PJMA kW

PM kW

Pmax. zul. kW

pump sizes

111-118

221-228, 331-338

441-448

551-558

75-2

1,7

0,17

1,35

1

●

●

75-4

4,2

0,26

3

2,2

●

●

75-6

7

0,35

5,5

4,5

●

●

110-2

4,7

0,32

3,6

2,8

●

●

●

110-4

10,8

0,58

7,5

7

●

●

●

110-6

17,4

0,85

13,5

10,8

●

●

●

135-6

25,8

1,2

17,5

16

●

●

135-8

35,5

1,65

24

21,5

●

●

07.0

1 5

/06

E.M

.

8

address:SERO PumpSystems GmbHIndustriestraße 3174909 Meckesheim near HeidelbergGermany

contact:Phone + 49 (62 26) 92 01-0Fax + 49 (62 26) 92 01-40info@seroweb.desales@seroweb.deservice@seroweb.de

information:www.seroweb.de

SEMA-Sfor extremely low NPSH values

SEMA-Lpump body with reference to DIN EN 734 left handed

SEMA-Zpump body with reference to DIN EN 734 right handed

SEMA-Blockin closed coupled design. Also available with pump body withreference to DIN EN 734

Performance characteristicsn = 1450 1/ min.

SEMA-S

Performance characteristicsn = 1450 1/ min.

SEMA-L, -Z

Performance characteristicsn = 1450 1/ min.

SEMA-Block