Stübbe NX Series Installation instructions

X-CLASS HEAVY DUTY PUMP
Standardized pump NX for
chemicals DIN EN ISO 2858
Standardized Close-coupled
plastic pump BX for chemicals
according to DIN EN ISO 2858
Original operating manual NX / BX series
Version BA-2019.04.17 EN
Print-No. 300 785
TR MA DERev003
STÜBBE GmbH & Co. KG
Hollwieser Straße 5
32602 Vlotho
Germany
Phone: [phone]
Fax: [phone]
E-mail: [email protected]
Internet: www.stuebbe.com
Subject to technical modifications.
Read carefully before use.
Save for future use.

Table of contents
Table of contents
1 About this document ............................... 5
1.1 Target groups ................................. 5
1.2 Other applicable documents ................ 5
1.3 Warnings and symbols ....................... 6
2 General safety instructions ....................... 7
2.1 Intended use .................................. 7
2.2 General safety instructions .................. 8
2.2.1 Product safety ................................ 8
2.2.2 Obligations of the operating company ...... 8
2.2.3 Obligations of personnel ..................... 8
2.3 Specific hazards .............................. 9
2.3.1 Hazardous pumped liquids .................. 9
2.3.2 Potentially explosive atmospheres ... ....... 9
3 Layout and Function ............................... 10
3.1 Marking ....................................... 10
3.1.1 Name plate ................................... 10
3.1.2 ATEX type plate .............................. 10
3.1.3 Pump type code .............................. 11
3.1.4 – Mechanical seal type code ................ 11
3.2 Description .................................... 12
3.2.1 NX /BX pump ................................. 12
3.2.2 NX / BX ATEX pump ......................... 12
3.3 Assembly ..................................... 13
3.3.1 NX ............................................. 13
3.3.2 BX ............................................. 14
3.4 Shaft seals .................................... 15
3.4.1 Single-acting STÜBBE PTFE bellows-type
mechanical seal .............................. 15
3.4.2 Single-acting STÜBBE mechanical seal, type
UV2 ........................................... 17
3.4.3 Double-acting STÜBBE mechanical seal,
type UV3 / Metax G-SBA .................... 17
4 Transport, Storage and Disposal ................. 18
4.1 Transport ...................................... 18
4.1.1 Unpacking and inspection on delivery ...... 18
4.1.2 Lifting .......................................... 18
4.2 Storage ....................................... 19
4.3 Disposal ....................................... 19
5 Installation and connection ....................... 20
5.1 Preparing for installation ..................... 20
5.1.1 Check operating conditions ................. 20
5.1.2 Preparing the installation site ............... 20
5.1.3 Prepare foundation and surface ............ 20
5.2 Installing with foundation .................... 20
5.2.1 Place pump unit on the foundation ......... 20
5.2.2 Attaching pump unit .......................... 21
5.3 Installing without foundation ................. 21
5.4 Planning the electrical system .............. 22
5.5 Connecting the NX pump .................... 22
5.5.1 Preparing the connection (NX) .............. 22
5.5.2 Installing motor (NX) ......................... 22
5.5.3 Installing the coupling guard (NX) .......... 22
5.5.4 Making the electrical connections to the
motor (NX) .................................... 23
5.5.5 Check direction of rotation (NX) ............. 23
5.5.6 Removing the coupling guard (NX) ..... .... 24
5.5.7 Install the coupling (NX) ..................... 24
5.5.8 Align the motor (NX) ......................... 24
5.5.9 Aligning the coupling precisely (NX) ... .. .. . 25
5.5.10 Complete the connection (NX) .............. 25
5.6 Connecting the BX pump .................... 25
5.6.1 Preparing the connection (BX) .............. 25
5.6.2 Dismantle the motor and the motor-side
coupling (BX) ................................. 25
5.6.3 Make the electrical connections to the motor
(BX) ........................................... 26
5.6.4 Check direction of rotation (BX) ............. 26
5.6.5 Install the coupling (BX) ..................... 27
5.6.6 Installing motor (BX) ......................... 27
5.6.7 Complete the connection (BX) .............. 27
5.7 Planning pipelines ............................ 27
5.7.1 Specifying supports and flange
connections ................................... 27
5.7.2 Specifying nominal widths ................... 28
5.7.3 Specifying pipe lengths ...................... 28
5.7.4 Provide self-priming container .............. 28
5.7.5 Optimizing changes of cross section and
direction ....................................... 28
5.7.6 Planning expansion joints ................... 28
5.7.7 Planning a non-return valve ................. 28
5.7.8 Planning venting facilities and pressure
gauges ....................................... 28
5.7.9 Discharging leaks ............................ 29
5.7.10 Providing safety and control devices
(recommended) .............................. 29
5.8 Connecting the pipes ........................ 29
5.8.1 Keeping the piping clean .................... 29
5.8.2 Installing auxiliary pipes ..................... 29
5.8.3 Installing the suction pipework .............. 30
5.8.4 Installing the pressure pipe .................. 30
5.8.5 Inspection for stress-free pipe
connections ................................... 30
5.9 Performing the hydrostatic test .............. 30
6Operation ............................................ 31
6.1 Preparing for commissioning ................ 31
6.1.1 Check downtimes ............................ 31
6.1.2 Lubricate an oil-lubricated pump with
oil .............................................. 31
6.1.3 Filling and bleeding .......................... 31
6.1.4 Preparing auxiliary systems (if
present) ....................................... 31
6.2 Commissioning ............................... 31
6.2.1 Switching on .................................. 31
6.2.2 Switching off .................................. 32
6.3 Shutting down the pump ..................... 32
2 NX / BX BA-2019.04.17 EN 300 785

Table of contents
6.4 Restoring the pump to service .............. 32
7 Maintenance ......................................... 33
7.1 Inspections ................................... 33
7.2 Servicing ...................................... 33
7.2.1 Maintenance in accordance with maintenance
schedule ...................................... 34
7.2.2 Lubricate bearings ........................... 35
7.2.3 Cleaning the pump ........................... 35
7.3 Dismounting .................................. 36
7.3.1 Preparations for dismounting ................ 36
7.4 Replacement parts and return . .. ........... 36
8 Troubleshooting .................................... 37
9 Appendix ............................................. 41
9.1 Replacement parts ........................... 41
9.1.1 Part no. and description ..................... 41
9.1.2 Sectional drawing NX ........................ 43
9.1.3 Sectional drawing BX ........................ 44
9.2 Technical specifications ...................... 45
9.2.1 Ambient conditions ........................... 45
9.2.2 Parameters for auxiliary systems ...... ..... 45
9.2.3 Sound pressure level ........................ 46
9.2.4 Tolerance values for adjusting the
coupling ....................................... 49
9.2.5 Coupling installation variant ................. 49
9.2.6 Flange tightening torques ................... 50
9.2.7 Tightening torques of casing screws ........ 50
9.2.8 Lubrication .................................... 51
9.2.9 Lubricant ...................................... 51
9.2.10 Flushing quantities ........................... 52
9.2.11 Operational limits ............................. 54
9.2.12 Connection loads ............................. 54
9.2.13 Switching frequency ......................... 54
9.3 Special tool ................................... 54
9.4 Declaration of conformity in accordance with
EC machinery directive ...................... 55
300 785 BA-2019.04.17 EN NX / BX 3

Table of contents
List of figures
Fig. 1 Name plate (example) ....................... 10
Fig. 2 ATEX type plate (example) .................. 10
Fig. 3 Pump type code (example) .................. 11
Fig. 4 Mechanical seal type code (example) ...... 11
Fig. 5 Version NX .................................... 13
Fig. 6 Version BX .................................... 14
Fig. 7 Simple bellows mechanical seal, inner
flushing variant ............................... 15
Fig. 8 Simple bellows mechanical seal, inner
flushing and quenching ..................... 15
Fig. 9 Single acting mechanical seal, continuous
flushing ....................................... 16
Fig. 10 Single acting bellows mechanical seal,
flushing after use ............................. 16
Fig. 11 Single-acting mechanical seal, type
UV2 ........................................... 17
Fig. 12 Double-acting mechanical seal, type
UV3 ........................................... 17
Fig. 13 Attaching lifting gear to the pump unit .... .. 18
Fig. 14 Attach lifting gear to pump ................... 18
Fig. 15 Installation with foundation .................. 21
Fig. 16 Installation without foundation ............... 21
Fig. 17 Connecting the motor ........................ 23
Fig. 18 Possible misalignments ...................... 25
Fig. 19 Connecting the motor ........................ 26
Fig. 20 Straight pipe lengths in front and after the
pumps (recommended) ..................... 28
Fig. 21 Sectional drawing NX ........................ 43
Fig. 22 Sectional drawing BX ........................ 44
List of tables
Tab. 1 Other application documents, purpose and
where found .................................. 5
Tab. 2 Warnings and symbols ....................... 6
Tab. 3 Pressure test ................................. 30
Tab. 4 Measures to be taken if the pump is shut
down .......................................... 32
Tab. 5 Measures depending on the behavior of the
pumped liquid ................................ 32
Tab. 6 Maintenance schedule ....................... 34
Tab. 7 Fault/number assignment ................... 37
Tab. 8 Troubleshooting list .......................... 40
Tab. 9 Designation of components according to part
numbers ...................................... 42
Tab. 10 Ambient conditions ........................... 45
Tab. 11 Sealing medium pressure, will be specified
by the manufacturer depending on the
operating point ............................... 45
Tab. 12 Sound pressure (LpA) / sound power level
(LwA) of the motor in db(A) .................. 46
Tab. 13 Sound pressure (LpA) / sound power
level (LwA) of the pump without motor in
db(A) .......................................... 47
Tab. 14 Tolerance values for the max. permissible
axial displacement of the coupling .......... 49
Tab. 15 Coupling installation variant for pump type
BX ............................................. 49
Tab. 16 Flange tightening torques ................... 50
Tab. 17 Tightening torques of casing screws ...... .. 50
Tab. 18 Lubricant quantities .......................... 51
Tab. 19 Lubricant ...................................... 51
Tab. 20 Flushing quantities for continuous flushing,
bearing bracket size (LTG) 1 to 3 ........... 52
Tab. 21 Flushing quantities for continuous flushing,
bearing bracket size (LTG) 4 ................ 52
Tab. 22 Flushing quantities for quenching /
continuous quenching, bearing bracket size
(LTG) 1 to 3 ................................... 52
Tab. 23 Flushing quantities for quenching /
continuous quenching, bearing bracket size
(LTG) 4 ........................................ 52
Tab. 24 Flushing quantities for double-acting
mechanical seal, bearing bracket size (LTG)
1 to 3 .......................................... 53
Tab. 25 Flushing quantities for double-acting
mechanical seal, bearing bracket size (LTG)
4 ............................................... 53
Tab. 26 Volumetric flow of the pumped
medium ....................................... 54
Tab. 27 Maximum supply pressure .................. 54
Tab. 28 Operating temperature and operating excess
pressure of the pumped medium .... ....... 54
Tab. 29 Pump size and maximum speed ............ 54
Tab. 30 Switching frequency ......................... 54
Tab. 31 Special tool ................................... 54
4 NX / BX BA-2019.04.17 EN 300 785

About this document
1 About this document
This manual
• is part of the equipment
• applies to all series referred to
• describes safe and proper operation during all operating
phases
1.1 Target groups
Operating company
• Responsibilities:
– Always keep this manual accessible where the device
is used on the system.
– Ensure that employees read and observe this docu-
ment, particularly the safety instructions and warnings,
and the documents which also apply.
– Observe any additional country-specific rules and reg-
ulations that relate to the system.
Qualified personnel, fitter
• Mechanics qualification:
– Qualified employees with additional training for fitting
the respective pipework
• Electrical qualification:
– Qualified electrician
• Transport qualification:
– Qualified transport specialist
• Responsibility:
– Read, observe and follow this manual and the other
applicable documents, especially all safety instructions
and warnings.
1.2 Other applicable documents
To download:
ATEX additional manual (300 365)
Additional instructions for use in
explosive atmospheres
www.stuebbe.com/pdf_manuals/300365.pdf
To download:
Resistance lists
Resistance of materials used to chemicals
www.stuebbe.com/pdf_resistance/300051.pdf
To download:
Data sheet
Technical data and conditions of
operation
www.stuebbe.com/pdf_datasheets/300779.pdf
CE declaration of conformity
Conformity with standards
(→9.4 Declaration of conformity in accordance with EC
machinery directive, Page 55).
Tab. 1 Other application documents, purpose
and where found
300 785 BA-2019.04.17 EN NX / BX 5

About this document
1.3 Warnings and symbols
Symbol Meaning
• Immediate acute risk
• Death, serious bodily harm
• Potentially acute risk
• Death, serious bodily harm
• Potentially hazardous situation
• Minor injury
• Potentially hazardous situation
• Material damage
Safety warning sign
Take note of all information
highlighted by the safety warning
sign and follow the instructions to
avoid injury or death.
Instruction
1., 2., ... Multiple-step instructions
Precondition
→Cross reference
Information, notes
Tab. 2 Warnings and symbols
6 NX / BX BA-2019.04.17 EN 300 785

General safety instructions
2 General safety instructions
The manufacturer accepts no liability for damages caused
by disregarding any of the documentation.
2.1 Intended use
• Only use the pump with suitable media (→resistance lists).
• Do not use pump for combustible or explosive fluids.
• Adhere to the operating limits and size-dependent mini-
mum flow rates (→Tab. 26 Volumetric flow of the pumped
medium, Page 54).
• Avoid dry running:
Initial damage, such as destruction of bearings, seals and
plastic parts, will occur within a few seconds.
– Make sure the pump is only operated with, and never
without, pumped liquid.
– Ensure that the sealing chamber is sufficiently filled and
ventilated.
– Ensure that there are no excessively high amounts of
gas in the pumping medium.
– Only operate pump within the permissible operating
range.
– Ensure that the insertion of valves or filters does not
make the pressure too low on the inlet side of the pump.
– Ensure that high temperatures and/or low suction pres-
sure at the suction side do not cause the pressure in the
pump to fall below the vapor pressure of the pumped
medium, and do not cause gas bubbles form at the
mechanical seal.
– Ensure that no air is being drawn in via the mechanical
seal due to low supply pressure.
– In case of doubt provide a double-acting mechanical
seal.
• Avoid cavitation:
– Open the suction-side fitting and do not use it to regu-
late the flow.
– Do not open the pressure-side fitting beyond the
agreed operating point.
• Avoid overheating:
– Do not operate the pump while the pressure-side fitting
is closed.
– Observe the minimum flow rate (→Tab. 26 Volumetric
flow of the pumped medium, Page 54).
• Avoid damage to the motor:
– Do not open the pressure-side fitting beyond the
agreed operating point.
– Note the maximum permissible number of
times the motor can be switched on per hour
(→9.2.13 Switching frequency, Page 54).
– Do not exceed the maximum permissible speed
(→Maximum speeds, Page 54).
• Consult with the manufacturer regarding any other use of
the device.
• If pumps are delivered without motors, then final assembly
as a pump assembly must take place in accordance with
the provisions of the Machinery Directive 2006/42/EC.
• Use the pump only as part of a large system/tool.
Operate the pump in an explosion hazard environ-
ment (ATEX)
• Do not use pump for combustible or explosive fluids.
• Do not operate the pump with the isolation devices (such
as gate valves and stop valves) closed.
• Operate the pump at the permissible minimum volumet-
ric flow rate (→Tab. 26 Volumetric flow of the pumped
medium, Page 54).
• Ensure the necessary pressure and volumetric flow rate at
the auxiliary ports (quench liquid / blocking liquid).
• Comply with the maintenance intervals.
• The pump must be operated with two-way mechanical
seals, in order to avoid exceeding the upper temperature
limitintheeventofdryrunning.
Prevention of obvious misuse (examples)
• Observe pump limits of use regarding temperature, pres-
sure, flow and speed (→data sheet).
• The power consumption of the pump increases as the spe-
cific gravity of the pumped fluid increases. Adhere to the
permissible specific gravity in order to eliminate the pos-
sibility that the pump, coupling and motor become over-
loaded (→data sheet).
A lower specific gravity is permissible. Adapt the auxiliary
systems accordingly.
• When conveying fluids containing solids, observe the limit
values for proportions of solid particles and particle size
(→Data sheet, technical description).
• When using auxiliary plant systems:
– Ensure compatibility of the operating medium with the
product medium.
– Ensure constant supply of the relevant operating
medium.
• Pumps used with water as the pumped liquid must not be
used for foodstuffs or drinking water. Use for food or drink-
ing water only if specified in the data sheet.
• When drawing flushing water from the normal drinking
water main:
– Use system separator for drink water main
• The type of installation should be selected only in accor-
dance with these operating instructions. For example, the
following are not allowed:
– Suspension within pipework runs of pumps mounted
on base plates
– Overhead installation
– Installation in the immediate vicinity of extreme heat or
cold sources
– Installationtooclosetoawall
300 785 BA-2019.04.17 EN NX / BX 7

General safety instructions
2.2 General safety instructions
Observe the following regulations before carrying out any
work.
2.2.1 Product safety
The pump has been built according to state-of-the-art technol-
ogy and the recognized technical safety regulations. Never-
theless, operation of the pump can still put the life and health
of the user or third parties at risk or damage the pump or other
property.
• Operate the pump only if it is in perfect technical condition
and use it only as intended, staying aware of safety and
risks, and in adherence to the instructions in this manual.
• Keep this manual and all other applicable documents com-
plete, legible and accessible to personnel at all times.
• Refrain from any procedures and actions that would pose
a risk to personnel or third parties.
• In the event of any safety-relevant faults, shut down the
pump immediately and have the fault corrected by appro-
priate personnel.
• In addition to the entire documentation for the product,
comply with statutory or other safety and accident-preven-
tion regulations and the applicable standards and guide-
lines in the country where the pump is operated.
2.2.2 Obligations of the operating company
Safety-conscious working
• Operate the pump only if it is in perfect technical condition
and use it only as intended, staying aware of safety and
risks, and in adherence to the instructions in this manual.
• Ensure that the following safety aspects are observed and
monitored:
– Intended use
– Statutory or other safety and accident-prevention reg-
ulations
– Safety regulations governing the handling of haz-
ardous substances
– Applicable standards and guidelines in the country
where the pump is operated
– Applicable guidelines of the operator
• Make personal protective equipment available.
Qualified personnel
• Make sure all personnel tasked with work on the pump
have read and understood this manual and all other appli-
cable documents, especially the safety, maintenance and
repair information, before they start any work.
• Organize responsibilities, areas of competence and the
supervision of personnel.
• Ensure that all work is carried out by specialist technicians
only:
– Installation, repair and maintenance work
– Transportation
– Work on the electrical system
• Make sure that trainee personnel only work on the pump
under supervision of specialist technicians.
Safety equipment
• Provide the following safety equipment and verify its func-
tionality:
– For hot, cold and moving parts: pump safety guarding
provided by the customer
– For pumps without capability to run dry: Dry run pro-
tection
– For potential electrostatic charging: provide suitable
grounding
Warranty
• Obtain the manufacturer's approval prior to carrying out
any modifications, repairs or alterations during the warranty
period.
• Only use genuine parts or parts that have been approved
by the manufacturer.
2.2.3 Obligations of personnel
• All directions given on the pump must be followed (and kept
legible), e.g. the arrow indicating the sense of rotation and
the markings for fluid connections.
• Pump, coupling guard and components:
– Do not step on them or use as a climbing aid
– Do not use them to support boards, ramps or beams
– Do not use them as a fixing point for winches or sup-
ports
– Do not use them for storing paper or similar materials
– Do not use the hot pump or motor components as a
heating point
– Do not de-ice the pump using gas burners or similar
tools
• Do not remove the safety guarding for hot, cold or moving
parts during operation.
• Use personal protective equipment if necessary.
• Only carry out work on the pump while it is not running.
• Before all installation and maintenance work, disconnect
the motor from the mains and secure it against being
switched back on again.
• Never reach into the suction or discharge flange.
• Following all work on the pump, refit safety devices in
accordance with the instructions and bring into service.
8 NX / BX BA-2019.04.17 EN 300 785

General safety instructions
2.3 Specific hazards
2.3.1 Hazardous pumped liquids
• When handling hazardous fluids, observe the safety regu-
lations for the handling of hazardous substances.
• Use personal protective equipment when carrying out any
work on the pump.
• Collect leaking pumped liquid and residues in a safe man-
ner and damage them in accordance with environmental
regulations.
2.3.2 Potentially explosive atmospheres
Observe ATEX additional manual
• Additional instructions for use in explosive atmospheres
•www.stuebbe.com/pdf_manuals/300365.pdf
300 785 BA-2019.04.17 EN NX / BX 9

Layout and Function
3 Layout and Function
3.1 Marking
3.1.1 Name plate
Hollwieser Str.5
D-32602 Vlotho
Type
ø
ø
Q
Serial-No.
ID.NO.
H
P
n
m /h
3
m
-1
min
GLRD
B (orifice)
kW kg/dm
3
ρ
4
5
10
1
2
3
7
6
11
8
12
9
13
14
Fig. 1 Name plate (example)
1Pumptype
2 Serial number
3 Identification number
4 Impeller diameter (main vanes, back vanes) [mm]
5 Diaphragm diameter
6 Specific gravity
7 Mechanical seal code
8 Specifications for shaft sleeve
9 Auxiliary seal information
10 Shaft seal information
11 Rotational speed
12 Power consumption of pump / motor
13 Differential head
14 Flow rate
3.1.2 ATEX type plate
Hollwieser Str.5
D-32602 Vlotho
Type
ø
ø
Q
Serial-No.
ID.NO.
H
P
n
m /h
3
m
-1
min
GLRD
B (orifice)
kW kg/dm
3
ρ
1
Fig. 2 ATEX type plate (example)
1 Explosion protection label
10 NX / BX BA-2019.04.17 EN 300 785

Layout and Function
3.1.3 Pump type code
1
2
3
4
5
6
7
8
N X H P 80 50 315 D
Fig. 3 Pump type code (example)
1Designtype
•N– Standard pump
•B– Close coupled pump
2Pumpseries
•X– X-CLASS heavy-duty pump
3 Hydraulic system
•H– Half-open impeller
•G– Closed impeller
•F– 3-channel free-flow impeller
•S– Closed impeller with front vanes and back vanes
4Material of the volute casing
•P– PP (polypropylene)
•E– UHMW-PE ultra-high molecular weight
low-density polyethylene)
•D– PVDF (polyvinylidene fluoride)
•T– PTFE/PFA (polytetrafluorethylene /
perfluoralkoxy polymer)
•H– UHMW-PE (conductive)
•I– PVDF (conductive)
•L– PTFE/PFA (conductive)
5Suction bore diameter
6 Discharge bore diameter
7Impeller nominal diameter
8Name affix (optional)
•D– Restricting orifice mounted directly on the
discharge flange
•V– Vertical installation
•S– Special version
3.1.4 – Mechanical seal type code
1
2
3
4
Q S 2 S
Fig. 4 Mechanical seal type code (example)
1Version
•E– Single acting mechanical seal
•Q–Singleactingmechanicalsealwithquench
•D– Double acting mechanical seal
2Manufacturer of the atmospheric side mechanical seal
•S– STÜBBE
3Type
•T– PTFE bellows (standard)
•E– Bellows od UHMW-PE
•2– UV2 (high-pressure single acting mechanical
seal)
•3– UV3 (high-pressure double acting mechanical
seal)
4 Flushing connection
•N– Standard version (double-acting mechanical
seal, single-acting mechanical seal without flushing)
•D– Continuous flushing
•S– Flushing after use
300 785 BA-2019.04.17 EN NX / BX 11

Layout and Function
3.2 Description
3.2.1 NX /BX pump
Metalclad chemical standard pumps, plastic, in process design.
The NX pump corresponds to standard DIN ISO 2858 for pres-
sure rating PN16. The sizes NX 40-25-160, NX 100-65-315
and NX 250-200-400 are based on the standard (transnorm
pumps).
The BX pump based on DIN EN ISO 2858.
• Horizontal single-stage non self-priming centrifugal pump
• Hydraulically efficient with half-open, closed and 3-channel
free-flow impellers (dependent on size)
• Bearing unit can be removed with the impeller without hav-
ing to dismantle the volute casing, pipework or motor.
• Thick-walled and replaceable plastic casing, metalclad
• Universal shaft for all available mechanical seals
• Proprietary mechanical seal module (single-acting and
double-acting)
• Bearings sealed for life, alternatively heavy-duty bearing
with grease or oil lubrication
• NX pump: Generously dimensioned fixed/loose bearings
as standard
•BXpump:
– Block design pump with connection port sizes to
DINENISO2858
– Integral shaft bearings and flanged motor
• Optional: Customer-specific hydraulics on request
Pump assembly:
• With clamped double Cardan shaft coupling as standard
• Sturdy coupling guard of PE or various metals
• Motor with integral motor plate adjustable for height flor
easy alignment (size-dependent)
• Multi-coat epoxy resin paint finish with top coat RAL 2002
(blood orange)
3.2.2 NX / BX ATEX pump
Pumps and units with special approval can be used as devices
for category 2G or 3G in explosion hazard environments (zone
1 and zone 2) (ATEX).
TheATEXconformityisshownonthenameplate(→Fig.
2 ATEX type plate (example), Page 10). A declaration of con-
formity to the EU - Explosion Protection Directive 2014/34/EU
must also be provided.
12 NX / BX BA-2019.04.17 EN 300 785

Layout and Function
3.3 Assembly
3.3.1 NX
123 1456 7 8 9 10
11121314
Fig. 5 Version NX
1 Armored casing of GGG40.3
2 Volute casing of plastic
3 Discharge flange
4 Sealing insert of plastic
5 Mechanical seal
6 Splash guard
7 Bearing casing of GGG40.3
8 Shaft of steel (1.7227)
9 Coupling
10 Coupling guard
11 Support foot
12 Leakage tray with drain connection
13 Impeller of plastic
14 Suction branch
300 785 BA-2019.04.17 EN NX / BX 13

Layout and Function
3.3.2 BX
123 1456 789
101112
13
Fig. 6 Version BX
1 Armored casing of GGG40.3
2 Volute casing of plastic
3 Discharge flange
4 Sealing insert of plastic
5 Mechanical seal
6 Splash guard
7 Bearing casing of GGG40.3
8 Hollow shaft
9 Coupling
10 Support foot
11 Leakage tray with drain connection
12 Impeller of plastic
13 Suction branch
14 NX / BX BA-2019.04.17 EN 300 785

Layout and Function
3.4 Shaft seals
Only one of the following shaft seals can be used
(→3.1.4 – Mechanical seal type code, Page 11).
3.4.1 Single-acting STÜBBE PTFE bellows-type
mechanical seal
• Sprung (PTFE) bellows (481)
• General-purpose chemical resistance since the spring
does not come into contact with the medium
• Up to 115 °C and up to 3 bar(g) inlet pressure
• Up to 8 bar(g) static pressure
• At rotating seal rings and stationary seal rings, torques
are transmitted by extremely stable splining (and not by a
clamp fit) (high break-away torque in the event of sticking
and adhesive forces)
• Suitable for pumping media containing solids
• The following versions are available as required:
– Inner flushing (A)
– Inner flushing and quenching (B)
– Continuous flushing (C)
– Flushing after use (D)
A) Version with internal flushing
(product flushing) – API plan 01 type ESTN
• For non-critical applications
• Flushing of the mechanical seal with the
pumped medium (product)
412.07 474
481 412.08412.04
412.05
475 472 482477524
412.06
507
443
Fig. 7 Simple bellows mechanical seal, inner
flushing variant
B) Version with internal flushing and quenching –
API plan 62 type QSTN
• Atmosphere-side seal of the bellows carrier (482) by radial
seal (421.3)
• The resulting cavity is filled with quenching medium (such
as de-ionized water):
– At pressures between 0.8 and 8 bar the integral flow
restrictor limits the quenching medium flow is limited
to 30 ltr / h (ensure free discharge of the quenching
medium; the pressure in the quenching chamber is lim-
ited to a maximum of 0.5 bar(g))
– This prevents formation of crystals within the mechan-
ical seal
– Protects against the mechanical seals running hot
when there is a partial vacuum in the shaft seal cavity
– Can be used even on versions with continuous quench-
ing (with quenching vessel). Used here without a flow
limiter
412.07
474
481
412.08475
472
477 412.06
482
421.3
412.12
412.10
507
443412.04
412.05
524
Fig. 8 Simple bellows mechanical seal, inner
flushing and quenching
300 785 BA-2019.04.17 EN NX / BX 15

Layout and Function
C) Version with continuous flushing – API plan 32
type ESTD
• Suitable for pumping media containing solids
• Flushes the mechanical seal with clean flushing medium
(such as water)
• Delimitation of the flushing medium by a throttle section
(labyrinth seal) within the pump
• Flushing volume is dependent on the solids content and
pumpsize40–250ltr/h(→9.2.10 Flushing quantities,
Page 52).
• It is useful to install a flow meter and a valve for controlling
the flushing flow
• The flushing medium will mix with the pumped medium. For
certain processes, such as evaporation processes or appli-
cations involving sulfuric acid, the use of flushing media is
prohibited.
412.07
474
481
412.08
412.04
412.05 443
475
472 482477 524 412.06
507
412.10
939.1
Fig. 9 Single acting mechanical seal, continuous flushing
D) Version for flushing after use, type ESTS
• For use with pumped media containing solids, where for
process reasons the use of flushing media is prohibited
• Design similar to the continuous flushing (C) variant, but
without the throttle section
• Flushes the mechanical seal with clean flushing medium
(such as water) immediately before the pump is switched
on or immediately after it is switched off (approx. 50-100 ltr
during the course of approx. 1-2 min flushing period)
• Prevents sedimentation when the pump is stationary, and
crystallization within the pump in the area of the mechanical
seal
• The flushing medium will mix with the pumped medium. For
certain processes, such as evaporation processes or appli-
cations involving sulfuric acid, the use of flushing media is
prohibited.
412.07
474
481
412.08
739.1
412.04
412.05
475
472
482
477
524
412.06 507
412.10
400.01 580.2
443
Fig. 10 Single acting bellows mechanical seal,
flushing after use
16 NX / BX BA-2019.04.17 EN 300 785

Layout and Function
3.4.2 Single-acting STÜBBE mechanical seal, type UV2
• General-purpose chemical resistance
• Sturdy high-pressure spring single mechanical seal in REA
version
• Up to 115 °C and up to 8 bar(g) inlet pressure
• Up to 16 bar(g) static pressure
• Stationary seal ring of SSiC
• Rotating seal ring of SSiC
• For use with pumped media containing solids and applica-
tions with high inlet pressures
• At rotating seal rings and stationary seal rings, torques are
transmitted by extremely stable splining
• Suitable for pumping media containing solids
• If required can be configured with quenching and/or con-
tinuous flushing or
standstill flushing
477
485
412.04 412.15
412.07
472
475
412.05
524
412.06
482
484
473 507
Fig. 11 Single-acting mechanical seal, type UV2
3.4.3 Double-acting STÜBBE mechanical seal,
type UV3 / Metax G-SBA
• General-purpose chemical resistance
• Sturdy high-pressure spring double mechanical seal in
REA version
• Up to 160 °C and up to 8 bar(g) inlet pressure
• Up to 16 bar(g) static pressure
• Identical stationary seal on the product side as for the sin-
gle mechanical seal (modular design principle)
• The high-end solution for highly critical applications (such
as all cases where no blocking or flushing medium may mix
with the pumped medium)
• Sealing medium with overpressure is necessary (comply
with the manufacturer's specifications). Version of the aux-
iliary plant system with thermosiphon reservoir (circuit) or
with free discharge. The discharge must be throttled to the
required quantity and pressure.
The sealing medium must not deposit any residues on the
sliding faces. For example, the following are allowed:
– Light-bodied oil without high-pressure additives
– Water/ethylene glycol mixture without corrosion
inhibitor additives
– Steam condensate, de-ionized water
412.4
412.05
412.06
412.16
412.07
412.15
412.08
471
524433
476
472
473 471
475
484
485 507
489
Fig. 12 Double-acting mechanical seal, type UV3
300 785 BA-2019.04.17 EN NX / BX 17

Transport, Storage and Disposal
4 Transport, Storage and
Disposal
4.1 Transport
The user/owner is responsible for the transport of the
pump.
Weight specifications (→documents for the particular
order)
4.1.1 Unpacking and inspection on delivery
1. Unpack the pump/pump assembly upon delivery and
inspect it for transport damage.
2. Check completeness and accuracy of delivery.
3. Ensure that the information on the name plate agrees with
the order/design data.
4. Report any transportation damage to the manufacturer
immediately.
5. Dispose of packaging material according to local regula-
tions.
4.1.2 Lifting
DANGER
Death or limbs crushed as a result transported items
falling over!
Use lifting gear appropriate for the total weight to be trans-
ported.
Attach lifting gear in accordance with the following dia-
grams.
Never use the lifting eye of the motor as the attachment
point for lifting the entire pump (the lifting eye of the motor
maybeusedforsecuringapumpassemblywithahigh
center of gravity against being knocked over).
Do not stand under suspended loads.
Do not incline the pump more than 10°.
Fig. 13 Attaching lifting gear to the pump unit
Fig. 14 Attach lifting gear to pump
1. Attach lifting gear in accordance with the following dia-
grams.
2. Lift the pump/pump assembly appropriately.
18 NX / BX BA-2019.04.17 EN 300 785

Transport, Storage and Disposal
4.2 Storage
NOTE
Material damage due to inappropriate storage!
Store the pump properly.
1. Seal all openings with blind flanges, blind plugs or plastic
covers.
2. Make sure the storage room meets the following condi-
tions:
–Dry
– Frost-free
– Vibration-free
–UVprotected
3. Overrun shaft every three months.
4. Make sure the shaft and bearing change their rotational
position in the process.
4.3 Disposal
Plastic parts can be contaminated by poisonous or radioac-
tive pumped liquids to such an extent that cleaning will be
insufficient.
WARNING
Risk of poisoning and environmental damage by the
pumped liquid or oil!
Use personal protective equipment when carrying out any
work on the pump.
Prior to the disposal of the pump:
– Collect and damage any escaping pumped liquid or oil
in accordance with local regulations.
– Neutralize residues of pumped liquid in the pump.
Remove plastic parts and damage them in accordance with
local regulations.
Dispose of the pump in accordance with local regulations.
300 785 BA-2019.04.17 EN NX / BX 19

Installation and connection
5 Installation and connection
For pumps in potentially explosive atmospheres (→ATEX
additional manual).
NOTE
Material damage due to distortion or passage of electrical
current in the bearing!
Do not make any structural modifications to the pump
assembly or pump casing.
Do not carry out any welding work on the pump assembly
or pump casing.
NOTE
Material damage caused by dirt!
Do not remove the transport seals until immediately before
installing the pump.
Do not remove any covers or transport and sealing covers
until immediately before connecting the pipes to the pump.
5.1 Preparing for installation
5.1.1 Check operating conditions
Ensure the required operating conditions are met:
– Resistance of the materials of the housing and seals to
the medium (→resistance list).
– Required ambient conditions
(→9.2.1 Ambient conditions, Page 45).
– Operational limits (→9.2.11 Operational limits,
Page 54).
5.1.2 Preparing the installation site
Ensure the installation site meets the following conditions:
– Pump is freely accessible from all sides
– Sufficient space for the installation/removal of the pipes
and for maintenance and repair work, especially for the
removal and installation of the pump and the motor
– Pump not exposed to external vibration (damage to
bearings)
– No corrosive exposure
– Frost protection
5.1.3 Prepare foundation and surface
Aids, tools, materials:
–Steelshims
– Spirit level
Installation options:
– With concrete foundation
– With steel foundation frames
– Without foundation
1. Ensure the foundation and surface meet the following con-
ditions:
– Level and horizontal
– Clean (no oil, dust or other impurities)
– Capable of bearing the weight of the pump assembly
and all operating forces
– Stability of the pump ensured
– With concrete foundation: Normal concrete of strength
class X0 in accordance with DIN EN 206
2. Clean pump sump carefully.
5.2 Installing with foundation
NOTE
Material damage due to distortion of base plate.
Position the base plate as follows on the foundation and
attach.
5.2.1 Place pump unit on the foundation
Aids, tools, materials:
– Anchor bolts
–Steelshims
– Mortar casting compound, no shrinkage
– Spirit level
1. Lifting the pump unit (→4.1 Transport, Page 18).
2. Hook anchor bolts in the mounting holes on the base plate
from below.
Observe manufacturers information when using the fixing
material.
3. Position the pump unit on the foundation. When doing so
lower the anchor bolts into the prepared anchoring holes.
20 NX / BX BA-2019.04.17 EN 300 785