Booster pump Calculation

PREMIER Re :

PREMIER ENGINEERING & TRADING PTE LTD

Consultant:

PROPOSED CONDOMINIUM HOUSING DEVELOPMENT COMPRISIN G OF 24-STY RESIDENTIAL BLOCK (128 UNITS) WITH 2 LEVELS BASEMENT CARPARK AT FORT RD. (THE FULCRUM) HPX CONSULTING ENGINEERS

Location:

Roof Top Domestic Booster Pump Booster System Calculation

Location 23rd Storey 22nd Storey 21st Storey 20th Storey 19th Storey 18th Storey 17th storey Total

Taps 1

W.C (Cistern) 16 54

Wash Basin 19 54

24

24

24

24

118

121

Sink

Bidet

Shower 11 54

Cooler

Long Bath

UR (FV)

WC (FV)

0

0

0

0

1 24 1 24

3 1 5

0

0

114

1) Calculations of flowrate a) Loadings Units i) ii) iii) iv) v) vi) vii) viii)

Taps W.C (Cistern) Wash Basin Sink Bidet Shower Points Bib Taps Long Bath

5 118 121 0 0 114 0 0

x x x x x x x x

3 2 1.5 5 3 3 3 10

= = = = = = = =

15 236 181.5 0 0 342 0 0

774.5 Therefore based on CP48, the total loadings units of

774.5

is equilvalent to

5.62

L/s.

Flush Valve Fittings Building Type : Group 1: Offices, Hotels & Hospitals Building Type : Group 2: Schools & other premises Type: 2 i) ii)

Water Closet Urinal

= =

Total nos. of flush valve =

0.0

Therefore according to CP48, the flowrate for flush valves type = 0 = 0

** Therefore total flowrate required

=

2) Calculation for Pressure Head a) Based on a flowrate of

0 nos 0 nos nos ( 3 nos. of urinal = 1 no. of flush valve ) 0 x

nos. of water closet & 1.5 L/s

nos. of urinal using

L/s

L/s (Include 20% Safety Factor)

6.74

6.74

0

L/s discharging from the pump.

(1 Duty, 1 Standby)

Frictional losses Frictional loss through pipe & fittings = Length of straight pipe = Vertical height = i) ii) iii) iv) v) vi) vii)

50 mm diameter 1 meters 1 meters

Gate Valve Check Valve Y-Strainer Flexible Connector Elbow & Bends Tee-joints Motorised Valve

Therefore friction losses through

2 1 1 2 2 2 0

(

32.34

x x x x x x x

0.37 4.44 4.44 4.44 2.035 3.885 0.37

) meters of diameter

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= = = = = = = Sub-Total =

0.74 4.44 4.44 8.88 4.07 7.77 0 30.34

50 mm

m m m m m m m m

of straight pipe is

(

32.34

3) Calculation for Pressure Head a) Based on a flowrate of

6.74

x

22.57

) x 1.2 / 100 =

8.76

meters,

Velocity of

3.400

L/s along the pipe line from pump discharge header to dropper at 23rd Sty.

Frictional losses Frictional loss through pipe & fittings = Length of straight pipe = Vertical height = i) ii) iii) iv) v) vi) vii)

80 mm diameter 40 meters 1 meters

Gate Valve Check Valve Y-Strainer Flexible Connector Elbow & Bends Tee-joints Motorised Valve

Therefore friction losses through of straight pipe is (

0 0 0 0 5 1 0

(

27 27

4) Calculation for Pressure Head a) Based on a flowrate of

1.44

x x x x x x x

0.2 3.4 3.4 3.4 1.5 3.2 0.2

= = = = = = = Sub-Total =

) meters of diameter 4.24 ) x 1.2 / 100 =

x

0 0 0 0 7.5 3.2 0 27

80 mm 1.37

m m m m m m m m

meters, Velocity of

1.33

L/s along the pipeline from to dropper to penthouse units at 24th sty.

Frictional losses Frictional loss through pipe & fittings = Length of straight pipe = Vertical height = i) ii) iii) iv) v) vi) vii)

50 mm diameter 30 meters 0 meters

Gate Valve Check Valve Y-Strainer Flexible Connector Elbow & Bends Tee-joints Motorised Valve

0 0 0 0 0 1 0

Therefore friction losses through of straight pipe is (

( 33.885

33.885 x

** Therefore total frictional loss =

10.71

meters

x x x x x x x

0.37 4.44 4.44 4.44 2.035 3.885 0.37

= = = = = = = Sub-Total =

) meters of diameter 1.431 ) x 1.2 / 100 =

0 0 0 0 0 3.885 0 3.885

50 mm 0.58

m m m m m m m m

meters,

Velocity of

5) Total Dynamic Discharge Head TDH = Frictional loss + = 10.71 + = 26.71 meters

Static Head 1

+ +

Discharge Pressure 15

6) Pump Size Flowrate & Head Q=

6.74

L/s

H=

26.71

meters

Based on flowrate of 6.74 L/s and a discharge head of 26.71 meters, the pump that we use are 2 nos. of ITT GOULDS pumps model 22SV03F30T (3.0 KW) giving a flowrate of 6.83 L/s and a head of 26.71 meters. (1 Duty, 1 Standby)

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0.76

7) Sizing of Pressure Vessel Types of system : 1) Conventional Booster System 2) Variable Speed Booster System ** Based on choice :

2

a) Flowrate (Cut-in) : b) Flowrate (Cut-Out) : c) Head (Cut-in) : d) Head (Cut-Out) : e) No. of Start/Stop per hour : f) No.of Pump : i)

7.50 4.20 20.00 35.00 15 2

L/s , L/s , meters , meters , s/s per hour pump(s)

Acceptance Factor =

450 252.0 2.00 3.50

Cut out

=

Cut out

4.50

= ii)

=

4.50

+ 2

Cut-Out flowrate

450

+ 2

252.0

351.00

L/min

60 2

min (1 hour) (50% pump running & 50% pressure vessel discharge)

=

30

min

Effective Capacity of the pressure tank

=

30 2

min

=

15

min

=

Mean Time Share by No. of pump(s) x Mean flowrate No.of Start/Stop per Hour

=

15

=

iii)

Therefore the total capacity of the pressure vessel

Prepared By : Revision no:

2 210

=

Effective Capacity Acceptance Factor

=

70.20 0.33

351.00 x

210.60 Litres

nos. 105 litres of Zilmet Hydro-Pro litres and a effective capacity of 72 (36L each)

Kelvin Goh 0

PREMIER

x 15

70.20 Litres

= Therefore we select has the overall capacity of

3.00

Mean Time =

Mean Time Share by No. of Pump

v)

(absolute pressure)

Cut-in flowrate

=

iv)

Cut in

0.33

Mean flowrate =

iii)

L/min L/min bar bar

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litres.

0.2