Operating manual liquid ring vacuum pumps and compressors series TRH - TRS - TRM - TRV - SA & Systems type HYDROSYS - OILSYS
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8 - MOUNTING AND ALIGNMENT INSTRUCTIONS
DANGER!
Danger of collision, harm and crushing! Do not start up the pump without the needful guards on both coupling
and motor. The coupling procedures must be carried out when the pump is stopped, after having activated the
safety procedures to prevent an accidental start-up (also see chapter 2). Operate provided with apposite
protective devices (helmet, glasses, gloves, shoes, etc.).
8.1 - ASSEMBLY OF BASE MOUNTED PUMP UNIT
If the pump has been purchased with free shaft end, a proper baseplate is required to mount the pump/motor assembly.
The baseplate must be properly designed for maximum rigidity to prevent vibrations and distortions. It is recommended
the use of a fabricated baseplate manufactured with
rigid “U” shaped channel (fig. 5 illustrates an example).
When the pump has been purchased without the electric motor, it is then required to select the proper motor before
proceeding to the installation of the unit. Selection of motor must consider the following:
- maximum power absorbed by the pump over the total operating range
- pump operating speed (RPM)
- available power (Hertz, voltage, etc.)
- motor enclosure type (CVE, ATEX, etc.)
- motor mount (B3, B5, horizontal, vertical, C-flange, D-flange, etc.).
Flexible couplings are selected considering:
- nominal motor horsepower
- motor operating speed
- coupling guard must meet safety standards
- possible pump damaging.
Flexible couplings must be properly aligned. Bad alignments will result in coupling failures and damage to
pump and motor bearings.
Assembly instructions for MONOBLOCK design are listed on paragraph 8.3 steps 1, 2, 4, 5, 6.
Assembly instructions for PUMP-MOTOR ON BASEPLATE are listed on paragraph 8.3 steps 7, 1, 8, 5, 9, 10, 11.
For pump driven with V-Belt, please consult POMPETRAVAINI for possible information.
8.2 - ALIGNMENT PROCEDURES FOR MONOBLOCK AND FOR PUMP/MOTOR ASSEMBLY ON BASEPLATE.
The pump/motor assembly is properly aligned by POMPETRAVAINI prior to shipment.
It is however required to verify the alignment prior to the start-up. Misalignment can occur during handling,
transportation, grouting of assembly, etc.
For alignment procedures of MONOBLOCK design see paragraph 8.3 steps 1, 2. 4, 5, 6.
For alignment procedure of BASEPLATE design see paragraph 8.3 steps 7, 1, 8, 5, 9, 10, 11.
PLEASE NOTE:
Coupling sizes and permissible coupling tolerances listed in this manual are applicable to the
particular coupling brand installed by POMPETRAVAINI as a standard. For sizes and tolerances of
other type of couplings, follow the instructions given by their respective manufacturer.
8.3 - ALIGNMENT INSTRUCTIONS
Alignment should be done at ambient temperature, obviously with power to the motor disconnected and following the
safety procedures to avoid accidental starting (see chapter 2).
Do not try to force the fitting of the coupling onto the shaft. First remove the elastomeric dowels and then heat up the
half coupling up to 150°C (do not use microwave ovens).
Should the pump operate at high temperatures that could upset the coupling alignment, it is necessary to check the
alignment to secure proper working operation at such operating temperatures.
It is recommended the use of proper hand protections such as gloves, when carrying out the operations listed below
(schematics for various assemblies are shown).
NOTE:
The following points must be followed with the sequence stated above and depending upon the type of
operation: alignment assembly or alignment verification.
1 - Thoroughly clean motor/pump shaft ends and shaft keys, place the shaft keys in the proper key way slots and fit the
coupling halves in line with the shaft ends. The use of rubber hammers and even pre-heating of the metal half
couplings may be required (see fig. 18).
Lightly tighten the set screws. Verify that both pump and motor shafts rotate freely.
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