Section 38 Water Requirements - AW 200 Operator's Manual

In most applications fresh
tap water is used
for cooling.
Free
flowing{ap
water requirements for
the dynamometer
are based on the ineoming water temperatur
e
md,
imiximum
rut",
discharge
temperature
of
1400F. The chart provided shows the
frish
water requirements based on
incoming temperature
versus increments of
100
H.p.
Enclosed systems require higher volumes of water
flow to
decrease the amount of temperature
rise between the inlet and
outlet. This
is
very important on
systems which
have no supplemental
cooling and only rely on
the holding tank as ahea|sink or
storage systems without
some source
for cooling
the hot water and
will
suffer
short tests and more maintenanee on
the-
dynamometer.
SECTION 38
WATER REQUIREMENTS
FOR
COI\TII{UOUS TESTING
Incoming
'Water
Temperature
0F
-Gallons Per Minute
400
5 10 15 20
25
30
35 40 45
500
6
12 18 24 30
36
42
4B 54
600
a
14
21
28
35 42 49
56 63
700
8
16 24 32
40
48
56 64 72
900
9 18 27
36 45
54
63 72
81
900
10
20 30 40
50
60
70 80
90
't000
13 26
39
52 65
78
91
104
117
1
100
17 34
51 6B 85 142 119
136 153
Horsepower
100 204
300
400 500 600
700 800
900
:
60'F
Exawple:
water requires
7
gpm to test 100
H.p.
Gravity feed
systems
are
not recommended
due
io
fo*
pressure creatid by them, reducing the
required volume
for cooling
several
areas
of caution should
be used when plumbing the
system.
1.
Retum lines from the dynamometer back to the cooling
system or drain must be
of the correct
size
as
not to create more than 8-10 P.S.I of back pressure on the dynamometer's tank.
NOTE:
The rotor on the dynamometer
will
not pump water.
Water must be forced through the
system
for proper cooling. It
is intended to
create
a
pressure drop
from the incoming watJr 30-
60 P.S.I down
to
a
maximum of 8-19 lbs
on the outlet.
Pressures greater than 8-10 lbs. on the
dynamometer tank
will
reduce water
seal
life.