PROCESSTEC ViscoTwin 104 3-A Series Instruction manual

PROCESSTEC, Inc. | 345 E Tulare Ave, Unit E | Visalia, CA 93277 | USA
www.processtec.com | [email protected]
Phone: [phone] | Fax [phone]
Technical Data and Instruction Manual for
ViscoTwin 104-xx 3-A
For more help visit: www.viscotwin.us/maintenanceandsupport/
-Torque values on drawing for all screws
-13 Maintenance movies showing all maintenance steps
-electronic form of this manual
-etc.

Manual ViscoTwin 104-xx 3A
Table of Content
Chapter
Data sheet
Dimensional drawing (optional)
1 Safety notes
2 Construction and general description
3 Transport, packaging, storage
4 Assembly / installation
5 Commissioning
6 Placing out of operation
7 Maintenance and servicing
8Disturbances and their elimination
9 Disassembly and assembly
10 Stocking of spare parts
Appendix:
- Torque-Tabel
- CIP | SIP | Manual Cleaning Procedure
- Oil - Change
All rights, also reproduction in the form of extracts thereof reserved.
All information is supplied without liability
PROCESSTEC, Inc. | 345 E Tulare Ave, Unit E | Visalia, CA 93277 | USA
www.processtec.com | [email protected]
Phone: [phone] | Fax [phone]

Technical documentation ViscoTwin screw
pump
Type:
ViscoTwin104-xx 3A
Serial no: __________
Configuration:
______________________________________________________________________________________________
Content: Specification
Instruction manual
Explosion drawings
Tightening torques
Created: May 15, 2015
PROCESSTEC, Inc. | 345 E Tulare Ave, Unit E | Visalia, CA 93277 | USA
www.processtec.com | [email protected]
Phone: [phone] | Fax [phone]

www.viscotwin.us Saved: 15 May 2015
Specification
Designation:ViscoTwin 104-xx 3A
Serial no _______
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Designation:ViscoTwin 104-__ 3A
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Copyright © PROCESSTEC, Inc., 2015

Manual ViscoTwin 104-xx 3A
Chapter 1
ViscoTwin_002 EN Page 1-1
1. Safety notes
1.1 Important notes
•Read these instructions before assembly and initial operation.
•They describe the safe use of the pump in all life cycles.
•Heed the safety notes contained without fail
•Do not put damaged products into operation
The notes on safe and undisturbed operation are designated as follows:
Symbol Signal word Meaning Consequences of disregard
Example.
General hazard
Specific hazard,
e.g. electric shock
Danger Imminent danger Severe or fatal injury
Warning! Possible dangerous situation Severe or fatal injury
Caution! Possible dangerous situation Minor injuries
Note! Potential damage to property Damage to pump or plant system
Note!
Important notes on explosion
prevention and protection
Neutralizing the explosion protection
and resulting dangers
Note! For safe and undisturbed
operation
1.2 Qualified personnel
The operating company has to instruct the operator by means of this Operating Manual. The
minimum age is 16 years. An experienced person has to supervise young persons and apprentices
during the work on the machine.
Only metal workers, industrial mechanics or persons with comparable education may perform
assembly, maintenance, initial commissioning, and repair work on the screw pump.
All electro technical work may only be performed by a trained electrically qualified person.
Electrically qualified person in the sense of this Operating Manual are individuals who are familiar
with electrical installation, commissioning, troubleshooting, and maintenance and hold a
corresponding qualification for this function.
All work in the other fields, transport, storage, operation, and disposal may only be carried out by
individuals who know the Operating Manual and have been appropriately instructed.
Make sure that the applicable standards and regulations of the respective country of use are kept
and monitored.
ATTENTION

ViscoTwin_002 EN Page 1-2
Manual ViscoTwin 104-xx 3A
Chapter 1
1.3 Further applicable documents
Heed the following additional documents:
Document Description
Data sheet Technical data, performance and operating limitations, service conditions
Dimensional drawing Pump dimensions and connections with mounting points
Spare parts lists Exploded drawing with spare parts
Assembly instructions Special models or incomplete machine
ATEX supplementary instructions Operating the pump in explosion hazardous area
Drive documentation Drive Operating Manual
Accessories documentation Accessories Operating Manual
Declaration of decontamination Shipping the pump for repair
1.4 Safety Notes for Commissioning, Maintenance, Inspection and Installation works.
Warning!!
The pump has live, pressurized, pressure-retaining and rotating or moved
machine parts and possibly hot surfaces during operation.
Potential consequences: Severe or fatal injuries.
•Principally perform any necessary work on the machine when the system is at a standstill.
•Disconnect the electric drive from mains and secure against unauthorised and inadvertent
activation.
•Make sure prior to opening the pump that the system and its auxiliary systems are in the
no-pressure state.
•Keep in mind that the pump may possibly have hot surfaces during and after operation.
•Follow the regulations on handling the pumping medium when opening the pump.
•Reattach all protection devices before restarting.
•Heed the points stated in Chapter ‘Commissioning’ when restarting.
Warning!
Risk of injuries through falling or tipping heavy machine parts.
Potential consequences: Severe or fatal injuries.
•The pump or parts of it may be very heavy and need to be moved using appropriate lifting
gear.

Manual ViscoTwin 104-xx 3A
Chapter 1
ViscoTwin_002 EN Page 1-3
1.5 Intended Use
The machine is intended for commercial use and may only be employed for delivery of the agreed
pumping media in accordance with this Operating Manual.
The operating points (delivery volume, pressure, rotational speed) mentioned in the pump specification
(→data sheet) should be understood as limit values and must not be exceeded.
Any change of the pump delivery conditions (e.g. delivery rate, delivery route, pressurisation level, pipe
diameter, throttle devices) may result in strongly changed operating conditions. If this occurs, compare
the new operating conditions with the data contained in the data sheet. You will need to consult with the
manufacturer if the changed conditions should exceed the data contained in the data sheet.
Deployment in the Ex area is prohibited unless not expressly intended for this purpose.
1.6 Predictable Misuse
•Only use the pump to deliver the specified medium.
•Do not operate the pump beyond the specified speed range.
•The solids contents in the pumping medium must not exceed
the specified limit values for grain size and proportion of solids.
•Take appropriate measures to ensure that no foreign objects (metal parts,
stones, etc.) can get into the pump and possibly cause damage.
•Do not use the stationary pump as shut-off device.
1.7 Operating Restrictions
The screw pump is a positive displacement pump that can build up very high pressure. The
developing pressure with the delivery line shut can reach the multiple of the permissible system
pressure. This may result in serious damage to system components posing a risk to persons.
Possible damage to property
•Do not operate against closed shut-off devices!
Breakage and risk of injuries!
•Secure the pump through approved safety devices (overpressure protection).
•Keep the relevant safety and handling instructions when delivering dangerous media.
•Medium contamination through foreign objects may result in damage to the pump elements.
•Observe the relevant legal requirements and the possibly resulting requirements and restrictions
when delivering and storing hazardous substances and inflammable liquids.
ATTENTION

Chapter 1
ViscoTwin_002 EN Page 1-4
1.8 Specific safety notes
Provide constructional contact protection for hot and cold parts.
Provide appropriate earth in case of a possible electrostatic charge.
Danger!
Rotating screw spindles in the pump can draw in arms or
other parts of the body.
Imminent danger: Severe or fatal injuries.
•Access into the pump during operation must not be possible.
•The running screw spindles can cause serious hand and personal injuries.
•Only operate the pump when mounted (connected to a piping system).
•Be sure to secure the openings (pressure and suction port) when running a possibly
necessary test run.
•Only perform manual cleaning and maintenance work after disconnecting the drive
(system control) from mains and protecting it from inadvertent and unauthorised
reclosure.
1.9 Specific safety notes on pumps with heating jacket
The housing of these pumps is of double jacket design and
has connections for heating medium flow.
The housing has been designed for 6 bar overpressure if no other internal pressure has been
approved in the data sheet.
Use for the inlet- and outlet connection of the heating circuit the connectors on the opposite
according to the nozzle. The connectors on the nozzle side can be used for the vent or a pressure
measurement.
Possible damage to property
•Operate the heating circuit exclusively using water.
Make sure by corresponding pressure limiting devices that the approved pressure rating
for the housing will not be exceeded. The medium escaping via the relief port has to be
discharged safely into a pressure less area when the pressure limiting device is
responding. No shut-off devices are allowed to be arranged in this area.
ATTENTION
Manual ViscoTwin 104-xx 3A

Chapter 2
ViscoTwin_002 EN Page 2-1
2.
2.1
Construction and general description
ViscoTwin pump construction
•only exemplary representation
Decisive for the dimension is the (dimensional drawing)
•3-A baseframe according to 3-A requirements as per
drawing #
ADrive
1Coupling with guard
2Gear housing
3Bearing housing
4Pump casing
5Cover
6Pump foot
7Base plate
Manual ViscoTwin 104-xx 3A

Chapter 2
ViscoTwin_002 EN Page 2-2
2.2 General description
ViscoTwin Screw pumps are rotating displacement pumps for delivering low to highly viscose media.
Pumpsfor use in the foodstuffs and beverage industry are designed and built to the
recommendations of DIN EN 1672-2 ‘Food processing machinery - Basic concepts’. This does not
include pipe connections, which require special cleaning procedures. These must be cleaned
manually by the operator. The cleaning cycle is dependent on the food and the relevant hazard from.
This is set by the operator. Correspond to the pipe connections according to DIN 11864, according
to DIN EN 1672-2 there is no health risk. The operator does not define any special cleaning
measures.
Non-corroding materials suitable for cleaning and/or disinfection are being used for the product-
contacting parts of these pumps. Elastomer materials and seals correspond to the BfR (German
Federal Institute for Risk Assessment) recommendations and the FDA guidelines respectively (US
Food and Drug Administration) and the Regulation (EC) No 1935/2004.
The pumps and pump units respectively are designed and built taking the health and safety
requirements of the EC Machinery Directive into account with all requirements met, either the EC
Declaration of Conformity (with CE mark) or in the case of partly completed machines, a Declaration
of Incorporation is issued.
ViscoTec, Inc. is assuring the conformity of 3-A standard 02-11 for the pumps delivered to 3-A
requiring purposes and verifies all parts and elastomer fulfill the sanitary standards also for spare
parts.
2.3 Sound emission
Each pump is manufactured and tested acc. to the currently valid technical documentation. The
weighted continuous sound level is normally <70 dB(A) with drive and pipe lines not included in this
measurement. Cavitation-free operation and proper fastening of the pump unit on level concrete slab
or warp resistant steel structure is taken for granted.
Manual ViscoTwin 104-xx 3A

Chapter 3
ViscoTwin_002 EN Page 3-1
3. Transport, packaging, storage
3.1 Transport / packaging
ViscoTwin pumps are shipped in non-returnable packaging. Any transport damage has to be
immediately reported to the transport company after receipt of the consignment. Do not put
damaged products into operation
Warning!
The pump can drop or tilt as a result of improper transport.
Potential consequences: Severe or fatal injuries.
•Use only hoisting gear and load-carrying equipment with sufficient load capacity.
•Lift pumps with suitable load-carrying equipment (chains, ropes) properly acc. to
opposing pictures using hoisting gear.
•The pictures used are example pictures
Possible damage to property
•When transporting pump units, consider that they can be very top heavy due to certain
drive assemblies.
•Never lift the whole unit using the lifting eye bolts of the drive unit.
These suspension points should only be used for the motor and/or gear unit.
•Always transport screw pumps in horizontal position.
Fig. 3.1 ViscoTwin 130 with baseplate and drive
ATTENTION
Manual ViscoTwin 104-xx 3A

Chapter 3
ViscoTwin_002 EN Page 3-2
3.2 Storage
ViscoTwin pumpsare sufficiently preserved under normal environmental conditions.
Take the following measures when storing for a longer period;
•Protect pump from dust, dirt, water, and other harmful environmental influences. Coat all
non-painted surfaces with acid-free and resin-free grease.
•Do not grease stainless steel parts and non-metallic parts.
•Cover all openings of pressure and suction ports.
•Drain water when using it as quench medium for shaft seal.
1. Make sure that the storage room meets the following conditions:
- frost-protected and dry.
2. Check the preservation regularly.
3.3 Disposal
Collect oil from gear unit and seals and dispose of acc. to the local regulations
3.3.1 Final decomposition of the pump, sorting
Check parts for applicability as spare parts and optionally store it.
Dispose of casing parts, screw spindles, shaft seals as steel scrap (VA scrap).
O-rings and parts of the rotating mechanical seals made from carbon/ceramics as residual waste.
Manual ViscoTwin 104-xx 3A

Chapter 4
ViscoTwin_002 EN Page 4-1
4. Assembly / installation
4.1 Rotational direction
The rotational direction of the drive shaft determines the direction of flow. The rotational direction is
stated on the data sheet and on the pump casing / coupling guard.
4.2 Speed and torque of the pump
The permissible speed and the maximum torque on the clutch shaft of the screw pumps are shown
in the following table:
Type of pump Min. Rotation Max. Maximum torque on
the clutch shaft
ViscoTwin 104 100 rpm 3600 rpm 200 Nm
ViscoTwin 130 100 rpm 2900 rpm 400 Nm
4.3 Mounting
Mounting of the pump in the case of the screw pump is done via the holes in the base plate and the
holes in the case foot respectively.
Provide for a solid and level ground, such as:
•A sufficiently dimensioned, level concrete slab,
•a level and warp resistant steel structure.
The foundation has to sustain the dead weight and all operating forces and guarantee pump unit
stability.
The size of the holes on the casing or base plate predetermine the diameters of the screws or dowel
anchors.
•Normally, mounting is done by screwed connection (hexagon head screws,
dowel anchors). In this context, observe the following screw diameters and
max. torqueing values:
Screw diameter Max. tightening torque
M10 44 Nm
M12 90 Nm
M16 220 Nm
(The values apply for hexagon head bolts to DIN 931-B or EN 24014 of strength category 8.8)
The pump units need to be tightly mounted to the base plate mounting points when the pump unit is
put up on 4 – 6 calottes. With this job done, the pump unit needs to be horizontally aligned by
adjusting the calotte feet so that the pump stands safely and firmly on the ground.
For the base frame installation of pumps meeting the requirements of 3-A Sanitary Standards
(Standard 02-11) leveling feet also meeting the requirements of 3-A Sanitary Standards (Standard
88-00) have to be used.
For pumps meeting the requirements of 3-A Sanitary Standards (Standard 02-11) a clearance of at
least 100 mm between aggregate console and the floor has to be observed.
Mobile pump units have to be locked via their fixing wheels prior to commissioning.
Manual ViscoTwin 104-xx 3A

Chapter 4
ViscoTwin_002 EN Page 4-2
4.3.1 Tightening torques for specified components
Tightening torques has been specified for certain components as shown in the table below:
Designation Screw∅Tightening torque
Fitting screws 2259 of the seal housing M8 10 Nm
Gear case cylinder head screws 2258 M8 20 Nm
Gearwheel hub cylinder head screws 2186 M5 8 Nm
Driven shaft hexagon screw 2177 M12 80 Nm
Cover hexagon screw 1041 M16 150 Nm
Spindle screw 2180 M16 150 Nm
Pump casing hexagon screw 1016 M16 150 Nm
Pump foot mounting M10 44 Nm
Gear housing screws M8 20 Nm
Groove nut M35 70 Nm
Groove nut M45 90 Nm
4.4 Pipe lines
Correct dimensioning of the pressure-side pipe line is crucial to avoid unnecessary pressure build up
when delivering viscous media. Therefore, orient yourself at least by the dimensions of the pump
flanges. The pressure stated in the data sheet must not be exceeded.
Mind the delivery pressure stated in the data sheet with respect to the pipe line pressure resistivity.
Purge the piping system and the feeding devices and clean them from foreign objects.
Seal pipe connections for quench exclusively with a sealing tape. Do not use liquid seals. Liquid seal
can clog the inner flushing lines.
Possible damage to property
•Do not use liquid seals.
•Liquid seal can clog the inner flushing lines.
4.4.1 Connection of the pipe lines
1. Clean and purge the pipes.
2. Flange the pump to the pipe line via elastic seals so that a tight connection develops and no
undue forces act on the pumps.
3. Provide shut-off devices for removing the pump and maintenance and fitting pieces in the
pressure and suction lines.
4. Provide safety valve or pressure monitoring right into the pipe line behind the pump.
ATTENTION
Manual ViscoTwin 104-xx 3A

Chapter 4
ViscoTwin_002 EN Page 4-3
Possible damage to property
•Do not support pipe lines on the pump! Mount pipe lines as force- and torque-free as
possible.
•Allow for the permissible forces and torques on the ports (see table below) when
connecting the pipe lines.
•Do not stress threaded connections with torques causing pipe clamping or declamping in
the pump casing.
4.4.2 Permissible forces and torques on the pump flanges
and
Nominal width F (x,y,z) [N] F (tot) [N] M (x,y,z) [Nm] M (tot) [Nm]
65 700 1000 310 450
100 840 1200 380 550
150 1190 1700 560 800
200 1540 2200 730 1050
4.5 Permissible pressure in the pump casing
The permissible internal compressive stress is specified in the datasheet.
F Fx Fy Fz
ges = + +
2 2 2 M Mx My Mz
ges = + +
2 2 2
ATTENTION
Manual ViscoTwin 104-xx 3A

ruction Handbook Eco Twin
Chapter 4
02 EN
4.6
Operation and maintenance space requirements
4.7
Electric connection
•
Electrical connection by qualified personnel only.
•
Disconnect system from mains and prevent unintentional restart/reclosing.
•
Check the data on the motor
the motor.
•
When connecting the motor, it is an imperative to heed the drive manufacturer's instructions and
the applicable regulations for electrical equipment (e.g. motor protection, main sw
•
Check the phase sequence for the direction of motor rotation prior to making the connection.
•
Screw pump are preferably operated on frequency converters or on
soft-
start control units.
Three
Low
voltage
•
Provide emergency stop facilities to shut down the pump in the event of dangerous situations.
W2
U1
L1
I Handbook Eco Twin
Chapter 4
Eco Twin
ViscoTwin_0_002 EN
Operation and maintenance space requirements
•
Allow for free space around the pump (
drawing to provide for maintenance work without removing the pump. To
simplify installation, use fitting pieces and shut
•
In addition, plan free space for sufficient drive motor ventilation (
documentation).
Electric connection
Danger!
Danger to life through electric shock!
Potential consequences:
Electrical connection by qualified personnel only.
Disconnect system from mains and prevent unintentional restart/reclosing.
Check the data on the motor
the motor.
When connecting the motor, it is an imperative to heed the drive manufacturer's instructions and
the applicable regulations for electrical equipment (e.g. motor protection, main sw
Check the phase sequence for the direction of motor rotation prior to making the connection.
Screw pump are preferably operated on frequency converters or on
start control units.
Three
-
phase current squirrel
Low
voltage
stated on the type plate.
Provide emergency stop facilities to shut down the pump in the event of dangerous situations.
W2
U2
V1
U1
L1
L2
Instruct co Twin
Operation and maintenance space requirements
Allow for free space around the pump (
drawing to provide for maintenance work without removing the pump. To
simplify installation, use fitting pieces and shut
In addition, plan free space for sufficient drive motor ventilation (
documentation).
Electric connection
Danger!
Danger to life through electric shock!
Potential consequences:
Electrical connection by qualified personnel only.
Disconnect system from mains and prevent unintentional restart/reclosing.
Check the data on the motor
When connecting the motor, it is an imperative to heed the drive manufacturer's instructions and
the applicable regulations for electrical equipment (e.g. motor protection, main sw
Check the phase sequence for the direction of motor rotation prior to making the connection.
Screw pump are preferably operated on frequency converters or on
start control units.
phase current squirrel
stated on the type plate.
Provide emergency stop facilities to shut down the pump in the event of dangerous situations.
V2
L3
W1
Instruction H co Twin
Operation and maintenance space requirements
Allow for free space around the pump (
drawing to provide for maintenance work without removing the pump. To
simplify installation, use fitting pieces and shut
In addition, plan free space for sufficient drive motor ventilation (
documentation).
Danger to life through electric shock!
Potential consequences:
Severe or fatal injuries.
Electrical connection by qualified personnel only.
Disconnect system from mains and prevent unintentional restart/reclosing.
Check the data on the motor
type plate against mains voltage and frequency before connecting
When connecting the motor, it is an imperative to heed the drive manufacturer's instructions and
the applicable regulations for electrical equipment (e.g. motor protection, main sw
Check the phase sequence for the direction of motor rotation prior to making the connection.
Screw pump are preferably operated on frequency converters or on
phase current squirrel
-
cage motor
high
stated on the type plate.
Provide emergency stop facilities to shut down the pump in the event of dangerous situations.
U1
L1
W2
Instruction H
Operation and maintenance space requirements
Allow for free space around the pump (
drawing to provide for maintenance work without removing the pump. To
simplify installation, use fitting pieces and shut
In addition, plan free space for sufficient drive motor ventilation (
Danger to life through electric shock!
Severe or fatal injuries.
Electrical connection by qualified personnel only.
Disconnect system from mains and prevent unintentional restart/reclosing.
type plate against mains voltage and frequency before connecting
When connecting the motor, it is an imperative to heed the drive manufacturer's instructions and
the applicable regulations for electrical equipment (e.g. motor protection, main sw
Check the phase sequence for the direction of motor rotation prior to making the connection.
Screw pump are preferably operated on frequency converters or on
cage motor
Provide emergency stop facilities to shut down the pump in the event of dangerous situations.
V1
U1
L2
W2
U2
Instruction Handbook Ec
Operation and maintenance space requirements
Allow for free space around the pump (
→
→→
→
dimensional
drawing to provide for maintenance work without removing the pump. To
simplify installation, use fitting pieces and shut
In addition, plan free space for sufficient drive motor ventilation (
Danger to life through electric shock!
Severe or fatal injuries.
Electrical connection by qualified personnel only.
Disconnect system from mains and prevent unintentional restart/reclosing.
type plate against mains voltage and frequency before connecting
When connecting the motor, it is an imperative to heed the drive manufacturer's instructions and
the applicable regulations for electrical equipment (e.g. motor protection, main sw
Check the phase sequence for the direction of motor rotation prior to making the connection.
Screw pump are preferably operated on frequency converters or on
Provide emergency stop facilities to shut down the pump in the event of dangerous situations.
W1
L3
V2
dimensional
drawing to provide for maintenance work without removing the pump. To
simplify installation, use fitting pieces and shut
-
off devices.
In addition, plan free space for sufficient drive motor ventilation (
Severe or fatal injuries.
Disconnect system from mains and prevent unintentional restart/reclosing.
type plate against mains voltage and frequency before connecting
When connecting the motor, it is an imperative to heed the drive manufacturer's instructions and
the applicable regulations for electrical equipment (e.g. motor protection, main sw
Check the phase sequence for the direction of motor rotation prior to making the connection.
Screw pump are preferably operated on frequency converters or on
Provide emergency stop facilities to shut down the pump in the event of dangerous situations.
drawing to provide for maintenance work without removing the pump. To
off devices.
In addition, plan free space for sufficient drive motor ventilation (
→
→→
→
drive
Disconnect system from mains and prevent unintentional restart/reclosing.
type plate against mains voltage and frequency before connecting
When connecting the motor, it is an imperative to heed the drive manufacturer's instructions and
the applicable regulations for electrical equipment (e.g. motor protection, main sw
itch).
Check the phase sequence for the direction of motor rotation prior to making the connection.
Provide emergency stop facilities to shut down the pump in the event of dangerous situations.
Page 4-4
drawing to provide for maintenance work without removing the pump. To
drive
type plate against mains voltage and frequency before connecting
When connecting the motor, it is an imperative to heed the drive manufacturer's instructions and
itch).
Check the phase sequence for the direction of motor rotation prior to making the connection.
Provide emergency stop facilities to shut down the pump in the event of dangerous situations.
Manual ViscoTwin 104-xx 3A

Chapter 4
EcoTwin_002 EN Page 4-5
4.8 Driving elements
Warning!
Driving elements are quickly moving during operation.
They can squash hands.
Potential consequences: Severe or fatal injuries.
•Always cover driving elements with a protective guard.
4.8.1 Coupling elements
ViscoTwin screwpump with free shaft (cylinder shaft with shaft key) are connected to the drive
through a flexible coupling.
Possible damage to property
•Do not mount using a hammer
•Use a pull-on device or heat the coupling half to approx. 90 °C.
(Remove rubber parts before) and mount the coupling in hot condition.
•The coupling halves must be aligned against each other.
•When assembling the drive with the pump, it is necessary to adjust
a = Maximum and minimum clearance
b = Angular offset and
c = Axial offset
acc. to the coupling manufacturer's specifications. (Enclosures)
4.9 Mounting and adjusting additional equipment accessories
Mount additional equipment accessories (speed measuring devices, counter-pressure systems)
according to the attached instructions (see Appendix).
ATTENTION
Manual ViscoTwin 104-xx 3A

Chapter 4
ViscoTwin_002 EN Page 4-6
4.10 Shaft seals
It is of the essence that there is a lubricating and cooling film between the seal faces. Depending on
application, there are various methods of ensuring that the appropriate medium is being fed to the
seal so that this film can be developed. Different types of rotating mechanical seals can be installed
into the screw pump. The built-in version is stated on the data sheet.
4.10.1 Single acting mechanical seal
The seal is being lubricated through the medium.
4.10.2 Single acting mechanical seal with Quench
In this version rotary shaft lip type seals provide a quench chamber at the mechanical seal. The
quench fluid is being supplied to the seal via a quench reservoir, and the quench fluid is circulated
back into the reservoir via a return pipe.
4.10.3 Double-acting mechanical seal with quench and thermo siphon rotation
In this version, the quench fluid is being supplied to the seal via a quench reservoir, and the quench
fluid is circulated back into the reservoir via a return pipe.
The quench medium circulates between seal and quench vessel due to the elevated temperature on
the rotating mechanical seal faces during pump operation.
Make sure before starting the pump that the quench medium can circulate from the seal to the
vessel and back. Carefully bleed the system.
Fur this purpose, attach the quench vessel approx. 1-2 m above the pump and the seal and vessel
should be connected through tubes preferably made from stainless steel. Other tubes or even hoses
can also be used temperature and medium permitting. The lines towards the seal inlet must be
fastened in continuously falling way and the lines from the seal outlet back to the vessel must be
fastened in a continuously rising way. (See Fig. 4a)
Possible damage to property
•The quench medium should not exceed a temperature of 70°C.
•No bubbles should form since otherwise circulation would no longer be ensured.
•In the case that the quench fluid temperature has to be cooled, the vessel can be equipped
with a condensing coil through which cold water flows.
4.10.4 Double-acting mechanical seal with flow
The seal is flown through by a quench medium in this version. This medium is supplied from an
external source (pressure pipe system, pump, connected ‘water line’, etc.).
Please ensure that the quench supply has been connected to the seal and quench fluid is flowing
through the seal before the pump is started. This is necessary to ensure that the sliding surfaces on
the outside are being cooled. Carefully bleed the system.
Both pressure and flow through the seal can be adjusted using a flow meter and two control valves.
This flow should be adapted to the heat generation on the seal depending on pressure, speed and
media temperature.
Adjust the flow such that the quench fluid outlet temperature does not exceed 40-45°C. The flow
velocity should not drop below 1 l/min.
ATTENTION
Manual ViscoTwin 104-xx 3A