7/23/2019 Pump Basic Calculation.pdf

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PT. DURAQUIPT CEMERLANGYour Trusted Partner in Industrial Pump And Solution

Head = Diff. Press. X 2.31 / S.G Hydraulic Institute Standard 1.6.5.3

PUMP CALCULATION

I. HEAD (Tanpa memperhitungkan posisi Discharge dan Suction pressure gauge )

(Feet) (Psi) Performance Tolerance

Capacity Level "A" Level "B"

Head = Diff. Press. X 0.703 / S.G 0 ~ 2999 +8% , -0 +5% , -3%

(Meter) (Psi) 3000 ~ +5% , -0 +5% , -3%

Head = Diff. Press. X 10.02 / S.G Head Level "A" Level "B"

(Meter) (Kg/Cm2) 200 ft ~ 500 ft +5% , -0 +5% , -3%

500 ft ~ +3% , -0 +3% , -0

Diff. Press = Dicharge press - Suction. Press

I. HEAD (Tanpa memperhitungkan posisi Discharge dan Suction pressure gauge )

Head = ( Diff. Press. X 2.31 / S.G ) + ( X' - Y' )

(Feet) (Psi) (Feet)

Head = ( Diff. Press. X 0.703 / S.G ) + ( X - Y )

(Meter) (Psi) ( M )

Suctionpressure

DischargePressure

X

Pipe 2"

I. HEAD (Tanpa memperhitungkan posisi Discharge dan Suction pressure gauge )

II. HEAD (Dengan memperhitungkan posisi Discharge dan Suction pressure gauge)

Head = ( Diff. Press. X 10.02 / S.G ) + ( X - Y )

(Meter) (Kg/Cm2) ( M )

II. NPSHA must be greater than NPSHr

API Standard 610 / ISO 13709

III. Hydraulic Horse Power Formula

HHP = Capacity x Head x S.G / 367.1 Head Rated

(Kw) (M3/Hr) (Meter) 0 ft ~ 500 ft +5% , -2 +10% , -10%

501 ft ~ 1000 ft +3% -2 +8% -8%

Shutoff

Performance Tolerance

Suctionpressure

DischargePressure

X

Y

Pipe 2"

Pipe 4"

I. HEAD (Tanpa memperhitungkan posisi Discharge dan Suction pressure gauge )

II. HEAD (Dengan memperhitungkan posisi Discharge dan Suction pressure gauge)

III. Hydrolic Horse Power

, - , -

HHP = Capacity x Head x s.g / 3960 > 1001 ft +2% , -2 +5% , -5%

(HP) (USGPM) (Ft)

IV. Brake Horse Power BHP = olt x Ampere x 1.732 x Efficiency x Cos /1000

KW

BHP = (Volt x Ampere x 1.732 x Efficiency x Cos / 1000) X 1.341

HP

Suctionpressure

DischargePressure

X

Y

Pipe 2"

Pipe 4"

I. HEAD (Tanpa memperhitungkan posisi Discharge dan Suction pressure gauge )

II. HEAD (Dengan memperhitungkan posisi Discharge dan Suction pressure gauge)

III. Hydrolic Horse Power

IV. Brake Horse Power

. Effesiensi pompa

Hydraulic Horse Power (HHP)

= ( Effesiensi Pompa )

Brake Horse Power (BHP)

NFPA 20 : Pada Capacity 0% (minimum flow) Head harus lebih kecil dari 140% X Rated Head

: Pada Capacity 150% (maximum flow) Head harus lebih besar dari 65% X Rated Head

Suctionpressure

DischargePressure

X

Y

Pipe 2"

Pipe 4"

I. HEAD (Tanpa memperhitungkan posisi Discharge dan Suction pressure gauge )

II. HEAD (Dengan memperhitungkan posisi Discharge dan Suction pressure gauge)

III. Hydrolic Horse Power

IV. Brake Horse Power

V. Efisiensi Pompa

AFFINITY LAWS

Q2 = Q1 (N2/N1) H2 = H1 (N2/N1)2

BHP2 = BHP1 (N2/N1)3

P1/P2 = (N1/N2)2

Q = Capacity H = Head BHP = Horse Power P = Power

N = Rpm N = Rpm N = Rpm N = Rpm

Q2 = Q1 (D2/D1) H2 = H1 (D2/D1)2

BHP2 = BHP1 (D2/D1)3

Suctionpressure

DischargePressure

X

Y

Pipe 2"

Pipe 4"

I. HEAD (Tanpa memperhitungkan posisi Discharge dan Suction pressure gauge )

II. HEAD (Dengan memperhitungkan posisi Discharge dan Suction pressure gauge)

III. Hydrolic Horse Power

IV. Brake Horse Power

V. Efisiensi Pompa

Q = Capacity H = Head BHP = Horse Power

D = Impeller Diameter D = Impeller Diameter D = Impeller Diameter

Stuffing Box Pressure = ( 0.15~0.3 X Diff. Pressure ) + Suction Press

Suctionpressure

DischargePressure

X

Y

Pipe 2"

Pipe 4"

I. HEAD (Tanpa memperhitungkan posisi Discharge dan Suction pressure gauge )

II. HEAD (Dengan memperhitungkan posisi Discharge dan Suction pressure gauge)

III. Hydrolic Horse Power

IV. Brake Horse Power

V. Efisiensi Pompa

Mechanical Seal Bekerja pada Stuffing box pressure ( Reference from John Crane )