Xylem IM157 Model MPVN - Manual (Page 6)

6
• The elastomer element will space the pump hub. Now
secure the pump hub to the shaft.
• Mount other half of the elastomer element. Tighten all
capscrews to recommended torques.
• Mount coupling guard.
Capscrew Torques
Recommended Capscrew Torques Coupling Torque – Dry
Size In. lbs. Ft. lbs.
2
3
4 204 17
5
10
20
30 360 30
40
50
60
70 900 75
80
100 3240 270
120
140 7080 590
Equipment Alignment
(coupling alignment is directly related to equipment and coupling life.)
Although Omega couplings can withstand gross
misalignment, care should be taken for best possible
alignment to assure optimum performance. The
caliper/straightedge alignment procedure is described
below. If greater alignment accuracy is desired, a dial
indicator method is recommended. There are occasions
when equipment manufacturers require more specific
alignment tolerances, in which case, the manufacturer’s
recommendations should be followed.
• To correct for angular misalignment, use calipers to
check the gap between hubs. Adjust or shim equipment
until the gap is the same at all points around the hubs.
• To correct parallel offset, place a straightedge across
the hub flanges in two places at 90° to each other.
Adjust or shim equipment until the straightedge lays
flat on both sides.
• Tighten down connected equipment and recheck
alignment.
• Install elastomer element, tightening all capscrews to
the values shown in table.
• If practical, recheck and tighten capscrews after several
hours of operation.
4.3 Connecting the Pipes to the Pump
Suction and Discharge Pipe
• The pipes must be of a size and design that liquid can
flow freely into the pump and that the pump functions
without problems. Particular attention is to be paid to
ensuring that suction pipes are airtight and that the
NPSH values are observed. Lay the suction pipe in the
horizontal section towards the pump so that it is slightly
inclined upwards so that no air pockets occur. In most
cases, it is recommended that a non-return valve is
installed in the discharge pipe shortly after the pump.
• When laying the pipes, make sure that the pump is
accessible for maintenance and installation.
• Please note 1.4: “Permitted Forces on Flanges”.
• Before connecting up to pump: remove protective
coverings from suction and discharge branches.
• To protect the shaft sealing (especially mechanical seals)
against foreign bodies, it is recommended that a sieve,
800 micron, is installed in the suction/intake pipe
when the motor is being started up.
• Before starting up, the pipe system, fittings and
equipment must be cleaned to remove weld spatter,
scale etc. Any pollutants are to be completely removed
from pump units that are directly or indirectly
connected to drinking water systems before being
installed and taken into use.
• If the pipe system is tested with the pump installed, do
not exceed the maximum permitted casing pressure of
the pump and/or shaft sealing (see Data Sheet).
• When emptying the pipe after the pressure test, make
sure that the pump is treated properly (danger of rust
and problems when starting up).
• In the case of pumps with stuffing boxes, replace
packing after pressure test (packing may be over-
compressed and thus no longer suitable for use).
Auxiliary Pipes
Any sealing, flushing or cooling pipe connections that are
necessary must be installed. Please consult the Data Sheet
to see which pipes, pressures and quantities are necessary.
The relevant detail drawing of the shaft sealing contains
a diagrammatic proposal for the pipework and fittings.
This proposal does not take into account the safety
requirements for each specific pump unit.
ATTENTION: POINT 1.4, “SEALING, COOLING”
MUST BE OBSERVED AS REGARDS
REGULATION AND MONITORING.
It is recommended that a pipeline is installed to take off
any leakage from the shaft seal. For connection, see the
Dimension Sheet.
4.4 Electrical Connection
Electrical connection work may
only be carried out by an authorized
professional. The rules and regulations
valid for electrical technology, especially
those concerned with safety measures,
must be observed. The regulations of the
power supply companies operating in
that area must also be observed.
Before starting work, check that the information on the
motor rating plate is the same as the local mains network.
The power supply cable of the coupled drive motor must
be connected up in accordance with the wiring diagram
produced by the motor manufacturer. A protective motor
switch is to be provided.
ATTENTION: THE DIRECTION OF ROTATION
SHOULD ONLY BE CHECKED
WHEN THE PUMP IS FULL. DRY
RUNNING WILL CAUSE DAMAGE
TO THE PUMP.
WARNING
Hazardous
voltage
IMPORTANT
Capscrews have self-locking
patches which should not
be reused more than twice.
Capscrews can be further used
with applications of a thread-
locking adhesive.
Do Not Lubricate Capscrew
Threads.
ADJUST FOR ANGULAR MISALIGNMENT ADJUST FOR PARALLEL OFFSET
PARALLEL OFFSET