Calculation Of minimum Inlet Pressure

Ponpa presioa euskarriaren presioaren presioa baino txikiagoa bada, zuntzek eragingo dute ponpa errendimenduan. Cavitation saihesteko eta pump sarrerako presio gutxieneko bat du, gehienezko xurgatze burua kalkulatu behar da honako hau:

H=Pbx10.2-NPSH-Hf-hv-Hs

Pb: Presio atmosferikoa, barra (kanalizazio itxi batean, sistema presio gisa hartu daiteke);
NPSH: Net positive suction head, m (Value at maximum flow of Q-NPSH curve);
Hf: Suction pipe line loss (Value at maximum flow of corresponding pipeline);
Hv: Lurruneko presio ertaina, m (tenperatura egokia duen lurruneko presio ertaina, lehenetsitako erdia ura da, eskuineko irudian4).
Hs: Segurtasun marjina, m, balio orokorra 0.5 da.
Calculation result: if H is positive, the pump is installed in suction way, otherwise, it is installed in downdraft way.

Note: It is not necessary to do above calculation under general conditions. Only when we use pump in the following situations do we need to calculate the H:
1. Tenperatura ertaina altua da;
2.The velocity of flow is larger than rated value;
3.Suction head is big or inlet pipeline is long;
4. Sistema presioa txikiegia da.
5.Inlet egoera txarra da.

Selection Of Pumps

Ponpa aukeraketak honakoa izan behar du:
Duty point of the pump.
Datu dimentsionalak, esate baterako, presioaren galerak, altuera desberdintasunen arrasate gisa, kanalizazioan marruskadura galera,
Ponpa eraginkortasuna, etab.
Pump materials
Pump konexioak
Ohiko erabilitako seal konfigurazio taulak

1. Duty point of the pump:

From a duty point it is possible to select a pump on the basis of the curve charts shown in "performance curves/technical" data.

2. Dimentsio datuak:

When sizing a pump the following must be taken into accounting: •Required flow and pressure at the draw-off point. •Pressure loss as a result of height differences. •Friction loss in the pipework(Hf) (Refer to Fig.1) It may. •Best efficiency at the estimated duty point. •NPSH value. •For calculation of the NPSH value, see corresponding curves chart.

3. Pump efficiency:

Eraginkortasun-punturik onena zehaztu aurretik, ponpa funtzionamendua identifikatu behar da. Pump funtzionamendua betebeharra berbera gisa espero zen, eta, ondoren, hautatu BL pump ponpak eraginkortasun onena dagokion betebeharra puntuan funtzionatzen.
As the pump is sized on the basis of the highest possible flow, it is important always to have the duty point to the right on the efficiency curve(eta) in order to keep efficiency high when the flow drops.

4. Ponpa materiala:

Pump konexioaren aukeraketa presio eta kanalizazioko lanen araberakoa da. Ponpa konexio erraztasuna zabala eskaintzen du, hala nola:

5. Ohiko erabilitako seal konfigurazio taulak

Aplikazioen eremua

Shaft seal mota

Shaft seal material

normal

Special

1

2

3

4 5

Type key

Rotating part

Kodea

Stationary part

Kodea

elastomeroak

Kodea

Compression spring

Collor

Kodea

0â "ƒ to + 90â" ƒ ur garbia

a-

Graphite

A

SiC

S

FPM

F

SUS304

C

ASFC

0â "ƒ to + 90â" ƒ ur garbia

a-

Komunak

W

Graphite

A

FPM

F

SUS304

C

WAFC

+90℃ to +120℃ corrosion resistance

a-

SiC

S

SiC

S

EPDM

E

SUS304

C

SSEC

up to 0℃

a-

Komunak

W

Komunak

W

EPDM

E

SUS304

C

WWEC

Zigilatze mota mekanikoa	Pump model	d1	d2	h
NJK	BL(T)2/4	12	12	55
	BL (T) 8/12/16/20	16	16	57,5
	BL (T) 32/45/60/90	22	22	72
NDA	BW (J) 2/4	12,7	16	32
	BW (J) 8/16	17.4	20	33.5