ABCDEFGHIJKLMNO
1
PUMP POWER CALCULATION
2
Pump TitleTRANSFER PUMPP-01A/B1hp = 0.7457 kW
3
SI UNIT SYSMETRIC UNIT SYS1 m3/hr= 4.4 gpm
4
CAPACITYm3/hr64.72GPMEQ 1Ph = Q ρ g h / (3.6 106)
5
DENSITY (SG IN METRIC SYS)1000kg/m30.934
6
TOTAL DIFF. HEAD96.8m213.255ftwhere
7
PUMP EFFICIENCY0.32%0.32%Note 1Ph = Power (kW)
8
GRAVITY9.81m/s2not req.Q = Capacity (m3/h)
9
POWER0kW10.1727751hpρ = Density (kg/m3)
10
0hp7.578717447kWg = gravity (9.81 m/s2)
11
h = Total Differential Head (m)
12
PUMP MOTOR SELECTIONη = Pump Efficiency
13
14
PUMP MAX. CAPACITY BASED ON IMPELLER0m3/hrNote 2EQ 2HP=GPM X HEAD (FT) X SG /(3960 X PUMP EFFICIENCY)
15
DENSITY (SG IN METRIC SYS)1000kg/m3Note 3NOTES
16
PUMP MAX. POWER @ RATED IMPELLER0kW1Take less efficiency at proposal stage for cost estimation purpose.
17
=0hp2Multiplying by Pump Service Factor= 1.15 for max capacity
18
FROM THE MOTOR RATING TABLE SELECT THE CORRESPONDING MOTOR11kWNote 43Electric motors are sized with SG assumed to be 1
19
=14.76510067hp4Rated power calculated for a selected imp size
20
REMEMBER: When choosing a motor for centrifugal pump, you must consider the impeller size, capacity, specific gravity of the fluid and
21
Service application in case of API requirement only.REF:
22
API REQUIREMENTS1http://www.lostock-electrical.co.uk/html/motor_rating.html
23
Oil refinery applications use a second factor recommended by API. This organisation specifies that athe factor should be used as an additional 2http://www.peerlesspump.com/Motor%20Selection%20Made%20Simple.pdf
24
safety margin. These factors are:
25
* Up to 25 hp (18.7 kW) = 1.25
26
* From 30 hp to 70 hp (22.4 kW to 52.2 kW) = 1.15
27
*100 hp or higher = 1.10