Mounting Position - Xylem GOULDS REDJACKET Serie Directives D'installation Et D'utilisation

Technical Data
Technical Data
(Continued)
Transformer Capacity Required for Submersible
Motors – Single or Three Phase
Distribution transformers must be adequately sized to satisfy
the KVA requirements of the submersible motor. When
transformers are too small to supply the load, there is a
reduction in voltage to the motor.
Table 1 references the motor horsepower rating, single
phase and three phase, total effective KVA required, and the
smallest transformer required for open or closed three phase
systems. Open systems require larger transformers since only
two transformers are used.
Other loads would add directly to the KVA sizing require-
ments of the transformer bank.
Table 1 – Transformer Capacity
Motor HP
Total Effective
KVA Required
1½ 3
2 4
3 5
5 7.5
7½ 10
10 15
15 20
20 25
25 30
30 40
40 50
50 60
60 75
75 90
100 120
125 150
150 175
175 200
200 230
NOTE: Transformers shown are standard nominal KVA ratings. If power company experience
and practice allows transformer loading higher than nominal rating under the specific operat-
ing conditions and maintains correct voltage and balance, such higher loading values may be
used for transformer(s) to meet total effective KVA required.

Mounting Position

Motors are suitable for operation in mounting positions
from vertical shaft up to horizontal. If 4 inch motors through
2 HP are started more than 10 times per day, it is recom-
mended the shaft be tilted up at 15° from horizontal to
minimize coast-down wear of the upthrust washer.
Smallest KVA Rating –
Each Transformers
Open WYE Closed
or DELTA WYE or DELTA
2 Transformers 3 Transformers
2 1
2 1.5
3 2
5 3
7.5 5
10 5
15 7.5
15 10
20 10
25 15
30 20
35 20
40 25
50 30
65 40
85 50
100 60
115 70
130 75
Frequency of Starts
The average number of starts per day over a period of
months or years influences the life of a submersible pumping
system. Excessive cycling affects the life of control compo-
nents such as pressure switches, starters, relays and capaci-
tors, plus splines and bearings. Rapid cycling can also cause
motor overheating and winding failures.
The pump size, tank size and other controls should be select-
ed to keep the starts per day as low as practical for longest
life, based upon the maximum number of starts per 24 hour
day, as shown in Table 2.
Motors over 2 HP should be allowed to run a minimum of
2 minutes to dissipate heat build up from starting current.
Table 2 – Number of Starts
Motor Rating
Single Phase
½ HP through 5 HP
7½ HP through 30 HP
40 HP and over
Motor Cooling, Temperature and Time Ratings
All 4 inch CentriPro motors may be operated continuously in
water up to 86º F. Optimum service life will be attained by
maintaining a minimum flow rate past the motor of .25 feet
per second. Use a Flow Sleeve if velocity is below the .25'/
sec, if the well is top feeding or when the pump is used in a
large body of water or large tank.
Six (6) inch canned design motors from 5 – 40 HP will
operate in water up to 95º F (35º C), without any de-rating
of horsepower, with a minimum flow rate of .5 ft./sec. past
the motor. 6" – 50 HP and all 8" – 10" motors can operate in
77º F (25º C) water with .5'/sec velocity past the motor.
Table 3 – Minimum Flow Rates For Proper Motor Cooling
3.75" Diameter
Well or
4" CP or FE Motor
Sleeve
.25'/sec
Diameter
(inches)
4 1.2
5 7
6 13
7 20
8 30
10 50
12 80
14 110
16 150
Multiply gpm by .2271 for m /Hr.
3
Multiply gpm by 3.785 for l/min.
Maximum Starts per 24 hour day
Three Phase
100 300
50 100
— 100
CP = 5.5" Dia. CP = 7.52" Dia.
6" CP Motor 8" CP Motor
.5'/sec. .5'/sec.
GPM Required
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7
23
41
85 53
139 107
198 170
276 313
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9
11