ROTOS PTM Series User manual

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SERIES PTM
TURBINE PUMPS
PLASTIC
SEAL LESS MAGNETIC DRIVE
INSTRUCTION MANUAL
FOR THE INSTALLATION
& OPERATION
& MAINTENANCE

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To obtain the best performance from your ROTOS pump, please read these instructions
carefully. Failure to observe the recommended procedures may result in damage to your ROTOS
pump, and may also invalidate the supplier's guarantee.
REMARKS ON THE USE OF THE PUMP PERFORMANCES CURVES
REGENERATIVE TURBINE MAGNETIC DRIVE PUMPS
1. Pump performances are guaranteed by ROTOS with manufacturing clearances according
to UNI 9902 Cl.II Appendix A specification. If the pumps are to be subjected to any other
specification requiring closer tolerances, this must be pointed out when a quotation is
requested. In such cases, the manufacturer ROTOS will select the required pump model
and will state the guaranteed tolerances.
2. Performances are valid for homogeneous liquids with specific gravity of 1 Kg/dmc.
If the liquid has a specific gravity different from 1, the actual power consumption will be
the one shown in the curve multiplied by the specific gravity.
For liquids having S.G. higher than 1,9 ask the manufacturer ROTOS.
3. Performances are valid for homogeneous liquids with viscosity of 1 cps.
If the liquid has a viscosity different from 1, the Q/H curve will be altered, also efficiency
decreases. For liquids having a viscosity lower than 0.5 cps, or, higher than 150 cps ask
the manufacturer ROTOS.
4. The NPSH values given in the curves are the lowest required values. As a rule the NPSH
value available on the plant should be, at least, 0.6 m higher of the NPSH value required
by the pump and stated on the performances curves.
5. The given efficiency is achieved by pump-prototypes; efficiency might result lower with
cast steel, stainless steel and special alloy constructions and standard production in series.
Reduce as follows : pumps with discharge nozzle up to 25 mm 3 % points
pumps with discharge nozzle over 25 mm 2 % points
6. MAXIMUM ADVISED TEMPERATURES ARE:
Plastic Pumps: 65°C - 80°C for pumps made of Polipropilene PP.
85°C - 95°C for pumps made of Polyvynilidenfluoride PVDF
(first value is referred to a continuous service. Second value is referred to an intermittent service)
7. If, for any technical reason, hydraulic required power is higher than the maximum
allowed motor power, the selected pump is not suitable for the application; please contact
the manufacturer ROTOS. [e-mail]

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8. ATTENTION: For plastic pumps, flanges, connections and piping on the
suction and discharge flange must be made in plastic and must be connected
to the pump carefully and without the use of strenght.

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THIS INSTRUCTION MANUAL is intended to guide those responsible for the installation,
operation and maintenance of ROTOS PTM
Please read it carefully, before you install and operate your ROTOS
pump.
ROTOS PTM –SERIES PUMP PRESENTATION
!

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W A R N I N G
WORKING WITH STRONG MAGNETS ESSENTIAL
PRECAUTIONS
1
Magnets can produce strong mechanical forces.
2
There is a danger of injury when two magnets are brought together by hand.
3
Magnets are brittle and are easily damaged. Breakage can occur when a
magnet is placed near another magnet or iron object without mechanical
guidance and special care.
4
If magnetic particles get into the eyes, get medical help immediately.
5
Heart pacemakers can be damaged.
6
Tools or other iron objects can be attracted suddenly.
7
Credit cards etc with magnetically stored information can be damaged.
8
Watches can be damaged.
!

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INDEX
1. WHEN RECEIVING YOUR ROTOS PUMP
2. PUMP FOUNDATION
3. PUMP AND MOTOR ALIGNMENT
4. LOCATION AND PIPING
5. ELECTRICAL CONNECTION AND PROTECTION AGAINST DRY RUNNING
6. ROTATION CHECK AND PREPARATION FOR START-UP
7. PRIMING THE PUMP
8. PUMP OPERATION
9. MAINTENANCE SCHEDULE
10. DECOMMISSIONING THE PUMP-(Anti-frost precautions)
11. DISASSEMBLING THE PUMP-(Precautions when working with strong magnets)
12. INSPECTION PRIOR TO REASSEMBLY
13. REASSEMBLING THE PUMP
14. PUMP PROBLEMS: CAUSES AND REMEDIES
15. SECTIONAL DRAWING
16. PART LIST
17. SECTIONAL DRAWING
18. PART LIST

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1. WHEN RECEIVING YOUR ROTOS PUMP
1Check the nameplate on the pump against the receiving and purchase order documents to be sure
that the correct size of pump and materials of construction have been supplied. If a motor has
been supplied, check that the power, speed, and voltage are correct.
1.1 Prior to unpacking, check for physical damage to the packing and the pump unit and notify the
forwarding agent IMMEDIATELY if any damage is found.
1.1.1 Check that the port covers are intact. If not, check whether foreign objects may have found their way
into the pump casing through the ports. Remove the port covers only when you are ready to connect
the pipes to the pump.
1.1.2 When shipped, the pumps are suitable for short-term storage only. If long-term storage is necessary
before the pump will be put into operation, we suggest that you contact your pump supplier for long-
term storage recommendations.
1.1.3 Check for free rotation of the pump. If the pump is close-coupled to the motor, remove the fan cover
from the motor and rotate the fan by hand. To check long-coupled pumps for free rotation, remove
the coupling guard and rotate the pump and motor shafts at the flexible coupling.
2. PUMP FOUNDATION
The foundation should be substantial in order to reduce vibrations, and rigid enough to prevent
flexing which can result in mis-alignment. Foundation bolts of the correct size should be located by
reference to certified drawings if the baseplate is supplied with the pump.
2.1 The pump must be mounted horizontally on a level foundation, with the discharge port vertically
upwards.
2.2 Close-coupled motor-pump units without baseplates
Level the pump base accurately, using shims under the pump feet. The pump must sit firmly and
evenly on its foundation. It must not be distorted by bolting to an uneven surface.
2.3 Motor-pump units on baseplates
Level the baseplate accurately, using shims under the base-plate next to the foundation bolts. The
baseplate must sit firmly and evenly on its foundation: it must not be distorted by bolting to an
uneven surface, which will throw the pump and motor out of alignment.

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3. PUMP AND MOTOR ALIGNMENT
3.1 Close-coupled pumps have been aligned prior to shipment and if they turn freely by hand, no
further adjustments are necessary.
3.2 Long-coupled pumps have been pre-aligned with the motor prior to shipment. If pump units receive
rough treatment during shipment, they can become mis-aligned. The flexible coupling is not
designed to compensate for mis-alignment. Improper alignment will cause vibration and premature
bearing failure.
3.2.1 CHECK THE ALIGNMENT OF PUMP AND MOTOR BEFORE START-UP.
A final alignment check should be made after the baseplate has been grouted and set, and the foundation
bolts have been tightened.
Couplings should be aligned within the following limits:
COUPLING TYPE
OFFSET
ANGULARITY
Displacement
Gap
Short flexible coupling
(3000 rpm)
0.05mm
0.04mm per 100mm
coupling diameter.
Flexible spacer coupling
(3000 rpm)
0.07mm per 100mm spacer length.
0.04mm per 100mm coupling
diameter.
LEVEL
F
FO OU UN ND DA AT TI IO ON N B BO OL LT TS S

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3.2.2 Methods of checking alignment
a. Straight edge
Using a straight edge, check the distance from the shaft at several points on the circumference of the
coupling. The distances d1 and d2 should each remain constant.
IMPORTANT NOTE:The straight edge method checks static coupling alignment, not shaft
alignment. It relies for its accuracy on the accurate alignment of each coupling half on its shaft. The
straight edge method is a useful preliminary check, but should not be seen as an effective final
alignment method.
b. Dial gauge ("clocking")
There are several methods, using one or two dial gauges. The lost accurate is the reverse indicator
method, using two gauges, which overcomes errors due to `sag' of the gauge bars.
c. Optical methods
Several proprietary systems are available, such as the `OPTALIGN' system (INA Linear Systems).
Mechanical errors are eliminated by optical alignment techniques. On request, your pump supplier
can provide further information about suitable alignment methods, including allowances for
THERMAL EXPANSION IN HIGH TEMPERATURE USE.
4. LOCATION AND PIPING
4.1 The correct pipework sizes should be selected according to the allowable limits of liquid velocity
and pressure drop at the required flow rate. Check the NPSH required by the pump at its specified
duty point, and ensure that the minimum NPSH available exceeds that required.
This is particularly important for liquids near their boiling temperature (or bubble point).
4.2 Check that the pipework is THOROUGHLY CLEAN before the pump is installed.
4.3 Pipework connections must be accurately aligned with the pump ports, so that they can be connected
to the pump without forcing. Maximum allowable bending moments are set out in the Tables on
pages 4/5. These moments must not be exceeded, otherwise the pump may distort internally, or the
pump and motor may become mis-aligned. Pipework must be fully and independently supported as
close as practicable to the pump.

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Locate the pump as close as possible to the liquid source.
4.4 The suction line should be as short and straight as possible, with a minimum number of bends.
Bends should be radiused: avoid sharp elbows. Bends and fittings should be no closer than 20 pipe
diameters to the pump suction, to allow undisturbed flow to the pump impeller.
4.5 Liquid velocity in the suction line should normally be between 0.7 and 2.0m/sec. If the liquid is near
its boiling temperature (or bubble point), its velocity may need to reduced to 0.5-1.0m/sec. If the
suction line is oversized, the reducer at the pump inlet port should be ECCENTRIC, not concentric.
4.6 Generally, suction piping should be one or two sizes larger than the inlet bore of the pump, to keep
liquid velocity low and friction losses to a minimum. This becomes more important as the distance
between the pump and the liquid supply increases.
4.7 The suction line should slope so as to avoid air pockets.
Valves on the suction side should be mounted with stems horizontal, or vertically downwards. All
joints in the suction line must be tight, to prevent air from entering into the system, with the risk of
vapour locking.
If the pump is installed with a negative static inlet head (lower diagram), the foot valve/ strainer
must always be immersed at a sufficient depth to avoid entry of air into the pump. Take suitable
precautions to prevent vortexing in the supply vessel
A pressure gauge should be installed in the suction line, as close as possible to the pump.
ATTENTION !
!