Xylem IM010 R08 Model 3656/3756 - Manual (Page 4)

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indicated. Maximum working pressure for class 30 cast iron,
per ANSI B16.1, is 175 PSI.
Internal combustion engines are variable speed and variable
power machines. The power output depends on the engine
speed (RPM) and will be reduced when operating altitude,
and/or the air temperature increases. When driving the pump
at the RPM required to deliver water into the system piping,
the engine must operate within the Engine Manufacturers
minimum and maximum RPM limits. The power output to
supply the pump power demand must not exceed the continu-
ous power rating of the engine, after derating for all power
consuming engine accessories, and adjustmaner for installation
site altitude and air temperature.
DRIVE-TRAIN SIZING (BHP)
The BHP Equation is: (Flow x TDH) / 3960 x Eff.)
Note: For internal combustion units the BHP calculation must
be de-rated for the following conditions:
• 20% for continuous duty
• 5% for right-angle drive
• 3% for each 1,000 feet above sea level
• 1% for each 10º F above 60º F.
DRIVE-TRAIN SIZING (TORQUE)
Other than sizing an engine for BHP, torque calculations also
are required for proper sizing. Typically the horsepower and
torque rating do not follow the same relationship throughout
the usable range of a diesel engine (Figure 2). The equation for
torque (lbs/ft) is (5250 x BHP) / RPM.
Figure 2: HP (◆) vs. Torque (■)
VERIFY MATCH OF PUMP END TO ENGINE
SAE Bracket Size:
Engine drive pumps are available to fit engines having a stan-
dard SAE 5 through SAE 1 flywheel housing.
For a new engine, the engine supplier can provide the SAE
housing number.
For an existing engine, the flywheel housing bore and bolt
circle can be measured and compared against the standard SAE
housing dimensions listed in Table 1, to identify the housing
SAE number.
• Measure the flywheel housing bore (A), and the bolt circle
(B), as accurately as possible with a tape measure (to the
nearest 1/32 inch).
• Count the number of threaded holes in the flywheel housing
(C). Test the threaded holes with a bolt, to determine the
thread series.
• Compare the measured dimensions (A), (B), and (C) against
Table 1, to determine the SAE number of the flywheel hous-
ing, to be sure it matches the SAE number of your pump.
Sleeve
Washer
Lug
Top of foundation –
clean and wet down
Grout
Leveling wedges or shims – left in place
Base Grout hole ( 1 / 4 ”)
Finished grouting
( 1 / 2 to 3 / 4 ”)
Allowance
for leveling
Wood
frame
FRAME-MOUNTED UNITS
• A flat substantial foundation surface MUST be provided to
avoid distortion and/or strain when tightening the founda-
tion bolts. A rubber mounting is acceptable to reduce noise
or excessive vibration.
• Tighten motor hold-down bolts BEFORE connecting piping
to pump.
Figure 1
• It is recommended that the baseplate be grouted to a
foundation with solid footing. Refer to Figure 1.
• Place unit in position on wedges located at four points, two
below approximate center of driver and two below
approximate center of pump. Adjust wedges to level unit.
Level or plumb suction and discharge connections.
• Make sure bedplate is not distorted and final coupling
alignment can be made within the limits of movement of
motor and by shimming, if necessary.
• Tighten foundation bolts finger tight and build dam around
foundation. Pour grout under bedplate making sure the areas
under the pump and motor feet are filled solid. Allow grout
to harden 48 hours before fully tightening foundation bolts.
• Tighten pump and motor hold-down bolts before aligning
shaft or connecting the piping to pump.
• Allow grout to harden for 48 hours before tightening 4
foundation bolts.
SAE – Engine Driven Pumps
The SAE engine drive bearing frame is designed to bolt directly
to the flywheel housing for engines with an SAE no. 1, 2,
3, 4 or 5 mount. The pump shaft extension is sized for use
with couplings bolted directly to the flywheel. Goulds Water
Systems optional couplings are sized for 6½", 7½", 8", 10", and
14" flywheels. Although other flywheel mount couplings may
be used, it is recommended that the Goulds Water Systems
coupling be used to ensure long and trouble-free operation
from your Goulds Pump.
REQUIREMENTS FOR PROPER OPERATION
Pump End:
When delivering the required capacity (GPM) to the system
piping, the pump must add the amount of Head required
by the system at the capacity. The operating head-capacity
point should be as close as possible to the highest efficiency
line shown on the performance curve, and must be below the
head-capacity line labeled “maximum” RPM. The maximum
operaton RPM for the pump is determined by bearing life, or
in some cases, by the pressure limits of the pump. Suction and
discharge openings are NPT tapped for standard pipe, or faced
and drilled per ANSI B16.1, class 125 for standard flanges as
600
500
400
300
200
100
0
1500 1600 1700 1800 1900 2000 2100 2200 2300
RPM
TORQUE (LBS/F
T)
180
178
176
174
172
170
168
166
164
162
160
HP