SIST EN ISO 15783:2004

SLOVENSKI STANDARD
01-september-2004
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,62
Seal-less rotodynamic pumps - Class II - Specification (ISO 15783:2002)
Wellendichtungslose Kreiselpumpen - Klasse ll - Technische Anforderungen (ISO
15783:2002)
Pompes rotodynamiques sans dispositif d'étanchéité d'arbre - Classe II - Spécifications
(ISO 15783:2002)
Ta slovenski standard je istoveten z: EN ISO 15783:2003
ICS:
23.080 ýUSDONH Pumps
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 15783
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2003
ICS 23.080
English version
Seal-less rotodynamic pumps - Class II - Specification (ISO
15783:2002)
Pompes rotodynamiques sans dispositif d'étanchéité
d'arbre - Classe II - Spécifications (ISO 15783:2002)
This European Standard was approved by CEN on 9 January 2003.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovak Republic, Spain, Sweden, Switzerland and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2003 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 15783:2003 E
worldwide for CEN national Members.

Foreword
The text of ISO 15783:2002 has been prepared by Technical Committee ISO/TC 115 "Pumps" of
the International Organization for Standardization (ISO) and has been taken over as EN ISO
15783:2003 by Technical Committee CEN/TC 197 "Pumps", the secretariat of which is held by
AFNOR.
This European Standard shall be given the status of a national standard, either by publication of
an identical text or by endorsement, at the latest by September 2003, and conflicting national
standards shall be withdrawn at the latest by September 2003.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium, Czech
Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Luxembourg, Malta, Netherlands, Norway, Portugal, Slovak Republic, Spain, Sweden,
Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 15783:2002 has been approved by CEN as EN ISO 15783:2003 without any
modifications.
NOTE Normative references to International Standards are listed in Annex ZA (normative).
Annex ZA
(normative)
Normative references to international publications
with their relevant European publications
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of
any of these publications apply to this European Standard only when incorporated in it by
amendment or revision. For undated references the latest edition of the publication referred to
applies (including amendments).
NOTE Where an International Publication has been modified by common modifications, indicated
by (mod.), the relevant EN/HD applies.
Publication Year Title EN Year
ISO 3274 1996 Geometrical product specifications EN ISO 3274 1997
(GPS) - Surface texture: Profile
method - Nominal characteristics
of contact (stylus)
ISO 3744 1994 Acoustics - Determination of sound EN ISO 3744 1995
power levels of noise sources
using sound pressure -
Engineering method in an
essentially free field over a
reflecting plane
ISO 3746 1995 Acoustics - Determination of sound EN ISO 3746 1995
power levels of noise sources
using sound pressure - Survey
method using an enveloping
measurement surface over a
reflecting plane
ISO 5199 1986 Technical specifications for EN 25199 1992
centrifugal pumps - Class II
ISO 9906 1999 Rotodynamic pumps - Hydraulic EN ISO 9906 1999
performance acceptance tests -
Grades 1 and 2
INTERNATIONAL ISO
STANDARD 15783
First edition
2002-02-01
Seal-less rotodynamic pumps — Class II —
Specification
Pompes rotodynamiques sans dispositif d'étanchéité d'arbre — Classe II —
Spécifications
Reference number
ISO 15783:2002(E)
©
ISO 2002
ISO 15783:2002(E)
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ii © ISO 2002 – All rights reserved

ISO 15783:2002(E)
Contents Page
Foreword.v
Introduction.vi
1 Scope .1
2 Normative references.1
3 Terms and definitions .2
4 Design.7
4.1 General.7
4.2 Prime movers .7
4.3 Critical speed, balancing and vibrations.9
4.4 Pressure-containing parts .10
4.5 Branches, nozzles and miscellaneous connections.13
4.6 External forces and moments on flanges (inlet and outlet).14
4.7 Branch (nozzle) flanges .14
4.8 Impellers .14
4.9 Wear rings or equivalent components .14
4.10 Running clearance.14
4.11 Shafts.15
4.12 Bearings .15
4.13 Circulation flow.16
4.14 Nameplates.17
4.15 Direction of rotation .17
4.16 Couplings for magnetic drive pumps.17
4.17 Baseplate.18
4.18 Monitoring .18
5 Materials .19
5.1 Selection of materials.19
5.2 Material composition and quality.19
5.3 Repairs.19
6 Testing .19
6.1 General.19
6.2 Material tests.20
6.3 Pump test and inspection.20
7 Preparation for despatch .23
7.1 Surface protection.23
7.2 Securing of rotating parts for transport.23
7.3 Openings .23
7.4 Pipes and auxiliaries .23
7.5 Identification .23
8 Information for use .24
Annex A (normative) Data sheet for magnetic drive pumps and canned motor pumps .25
Annex B (informative) External forces and moments on flanges .30
Annex C (informative) Enquiry, proposal and purchase order.31
Annex D (informative) Documentation after purchase order.32
Annex E (informative) Typical circulation piping plans and characteristics for canned motor pumps
and magnetic drive pumps .33
ISO 15783:2002(E)
Annex F (informative) Internationally accepted materials for pump parts.39
Annex G (informative) Checklist .42
Bibliography .44

iv © ISO 2002 – All rights reserved

ISO 15783:2002(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO
member bodies). The work of preparing International Standards is normally carried out through ISO technical
committees. Each member body interested in a subject for which a technical committee has been established has
the right to be represented on that committee. International organizations, governmental and non-governmental, in
liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical
Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
The main task of technical committees is to prepare International Standards. Draft International Standards adopted
by the technical committees are circulated to the member bodies for voting. Publication as an International
Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 15783 was prepared by Technical Committee ISO/TC 115, Pumps, Subcommittee SC 1, Dimensions and
technical specifications of pumps.
Annex A forms a normative part of this International Standard. Annexes B, C, D, E, F and G are for information
only.
ISO 15783:2002(E)
Introduction
This International Standard is the first of a series dealing with technical specifications for seal-less pumps; they
correspond to two classes of technical specifications, Classes I and II, of which Class I is the more severe
requirements.
Where a decision may be required by the purchaser, or agreement is required between the purchaser and
manufacturer/supplier, the relevant text is highlighted with •••• and is listed in annex G.
vi © ISO 2002 – All rights reserved

INTERNATIONAL STANDARD ISO 15783:2002(E)

Seal-less rotodynamic pumps — Class II — Specification
1 Scope
1.1 This International Standard specifies the requirements for seal-less rotodynamic pumps that are driven with
permanent magnet coupling (magnet drive pumps) or with canned motor, and which are mainly used in chemical
processes, water treatment and petrochemical industries. Their use can be dictated by space, noise, environment
or safety regulations.
Seal-less pumps are pumps where an inner rotor is completely contained in a pressure vessel holding the pumped
fluid. The pressure vessel or primary containment device is sealed by static seals such as gaskets or O-rings.
1.2 Pumps will normally conform to recognized standard specifications (e.g. ISO 5199, explosion protection,
electromagnetic compatibility), except where special requirements are specified herein.
1.3 This International Standard includes design features concerned with installation, maintenance and
operational safety of the pumps, and defines those items to be agreed upon between the purchaser and
manufacturer/supplier.
1.4 Where conformity to this International Standard has been requested and calls for a specific design feature,
alternative designs may be offered providing that they satisfy the intent of this International Standard and they are
described in detail. Pumps which do not conform with all requirements of this International Standard may also be
offered providing that the deviations are fully identified and described.
Whenever documents include contradictory requirements, they should be applied in the following sequence of
priority:
a) purchase order (or inquiry, if no order placed), see annexes D and E;
b) data sheet (see annex A) or technical sheet or specification;
c) this International Standard;
d) other standards.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this International Standard. For dated references, subsequent amendments to, or revisions of, any of these
publications do not apply. However, parties to agreements based on this International Standard are encouraged to
investigate the possibility of applying the most recent editions of the normative documents indicated below. For
undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC
maintain registers of currently valid International Standards.
ISO 76, Rolling bearings — Static load ratings
ISO 281, Rolling bearings — Dynamic load ratings and rating life
ISO 3274, Geometrical Product Specifications (GPS) — Surface texture: Profile method — Nominal characteristics
of contact (stylus) instruments
ISO 15783:2002(E)
ISO 3744, Acoustics — Determination of sound power levels of noise sources using sound pressure —
Engineering method in an essentially free field over a reflecting plane
ISO 3746, Acoustics — Determination of sound power levels of noise sources using sound pressure — Survey
method using an enveloping measurement surface over a reflecting plane
ISO 5199, Technical specifications for centrifugal pumps — Class II
ISO 7005-1, Metallic flanges — Part 1: Steel flanges
ISO 7005-2, Metallic flanges — Part 2: Cast iron flanges
ISO 7005-3, Metallic flanges — Part 3: Copper alloy and composite flanges
ISO 9906, Rotodynamic pumps — Hydraulic performance acceptance tests — Grades 1 and 2
IEC 60034-1, Rotating electrical machines — Part 1: Rating and performance
EN 12162, Liquid pumps — Safety requirements — Procedure for hydrostatic testing
3 Terms and definitions
For the purposes of this International Standard, the following terms and definitions apply.
3.1
magnetic drive pump
MDP
pump in which the shaft power of the drive is transferred to the impeller of the pump by means of a permanent
magnetic field, which passes through a containment barrier (shell) to an inner rotor having permanent magnets or
an induction device
3.2
canned motor pump
CMP
pump in which the stator of an electric motor is separated from the rotor by a sealed containment barrier (liner)
NOTE 1 The rotor runs in the liquid being pumped or in another liquid.
NOTE 2 The shaft power is transmitted by means of an electromagnetic field.
3.3
seal-less rotodynamic pump
〈general〉 pump design in which the impeller shaft also carries the rotor of either a canned induction motor or a
synchronous or an asynchronous magnetic drive
NOTE The design does not use a dynamic shaft seal as a primary containment device. Static seals are the means used for
containing the fluid.
3.3.1
hydraulic end
that end of the pump which transfers mechanical energy into the liquid being pumped
3.3.2
power drive end
that end of the pump containing the magnetic coupling (MDP) or the motor (CMP) which provides the mechanical
energy necessary for the operation of the hydraulic end
2 © ISO 2002 – All rights reserved

ISO 15783:2002(E)
3.3.3
lubrication and cooling flow
flow necessary in a magnetic drive in the area between the inner magnet and the containment shell, or in a canned
motor between the rotor and the sleeve, for dissipation of the heat due to inherent eddy current losses in metallic
containment shells and frictional heat generation from bearings, and for lubrication
NOTE Internal pump bearings are lubricated and cooled by the pumped fluid or an external, compatible flushing fluid.
3.3.4
close coupled
〈MDP〉 coupling arrangement in which the motor is supplied with a flange adapter which mounts directly onto the
casing or body of the pump and in which the outer magnet ring is mounted onto the motor shaft
3.3.5
separately coupled
〈MDP〉 arrangement in which the motor and pump have separate mounting arrangements with the outer magnet
ring mounted on its own shaft, supported by rolling bearings, and connected to the motor shaft by means of a
flexible coupling
3.3.6
air gap
〈MDP〉 radial distance between the inner diameter (ID) of the outer magnet assembly and the outer diameter (OD)
of the containment shell
3.3.7
liquid gap
〈MDP〉 radial distance between the ID of the shell and the OD of the rotor sheath
3.3.8
liquid gap
〈CMP〉 radial distance between the ID of the liner and the OD of the rotor sheath
3.3.9
total gap
magnetic gap
〈MDP〉 radial distance between the ID of the outer magnets and the OD of the inner magnets/torque ring
3.3.10
total gap
magnetic gap
〈CMP〉 total distance between the ID of the stator laminations and the OD of the rotor lamination
3.3.11
radial load
〈MDP and CMP〉 load perpendicular to the pump shaft and drive shaft due to unbalanced hydraulic loading on the
impeller, mechanical and magnetic rotor unbalance, rotor assembly weight, and forces of the fluid circulating
through the drive
3.3.12
axial load
〈MDP〉 load in line with the pump shaft caused by hydraulic forces acting on the impeller shrouds and inner magnet
assembly
3.3.13
axial load
〈CMP〉 load in line with the pump shaft caused by hydraulic forces acting on the impeller shrouds and rotor
ISO 15783:2002(E)
3.3.14
hydraulic load balance
axial load equalization by means of an impeller design, impeller balance holes or vanes, or by balancing through
variable orifices in the drive section and hydraulics
3.4
starting torque
maximum net torque transmitted to the driven components during a hard (full voltage) start-up of the unit
NOTE It is affected by the inertia of the pump and motor rotors, the starting torque capacity of the motor and the power
versus speed requirements of the liquid end.
3.5
break-out torque
torque load applied to the drive shaft with the rotor locked at the point at which magnetic decoupling occurs
3.6
locked rotor torque
maximum torque that a motor will develop when prevented from turning
3.7
eddy currents
electrical currents generated in a conductive material when strong magnetic fields are rotated around it
3.8
magnetic coupling
device which transmits torque through the use of magnet(s) attached to the drive and driven shafts
3.9
inner magnet ring
rows of magnets operating within the containment shell, driven by the outer magnet ring
NOTE The inner magnet ring is mounted on the same rotating element as the pump impeller.
3.10
outer magnet ring
rows of permanent magnets securely fixed to a carrier, evenly spaced to provide a uniform magnetic field
NOTE The outer magnet ring, while rotating, transmits power through a containment shell, driving the inner magnet ring or
torque ring.
3.11 Eddy currents
3.11.1
eddy current drive
asynchronous magnetic coupling consisting of a permanent outer magnet ring and an inner torque ring containing a
network of conductive rods supported on a mild steel core
NOTE The rotating outer magnet ring generates eddy currents in the copper rods which convert the core to an
electromagnet. The electromagnet follows the rotating outer magnet ring but at a slightly slower speed due to slip.
3.11.2
eddy current loss
power loss resulting from eddy currents
NOTE The energy in these eddy currents is normally dissipated as heat due to the electrical resistance of the material.
3.11.3
torque ring
laminations and conductors mounted on the rotor in which electric currents are induced in an eddy current drive
4 © ISO 2002 – All rights reserved

ISO 15783:2002(E)
3.11.4
decouple
failure of a synchronous magnetic coupling to rotate synchronously, or the stall condition of an eddy current drive
3.11.5
slip
speed differential between the torque ring and outer magnet ring in an eddy current drive pump or between the
running speed and the synchronous speed in a CMP
3.11.6
demagnetization
permanent loss of magnetic attraction due to temperature or modification of the field
3.12 Containment
3.12.1
sheath
thin-walled hermetically sealed enclosure fitted to the inner rotor enclosing the inner magnet ring (MDP) or rotor
laminations (CMP)
See Figures 1 and 2.
3.12.2
shell
hermetically sealed enclosure fitted within the total-gap between the inner and outer magnet rings of an MDP and
which provides for the primary containment of the pumped liquid
See Figure 2.
3.12.3
liner
hermetically sealed enclosure fitted to the ID of the stator assembly of a CMP and providing for the primary
containment of the pumped liquid
See Figure 1.
3.12.4
secondary containment
backup pressure-containing system using static seals only to contain leakage in the event of failure of the primary
containment by shell or by liner, and including provisions to indicate a failure of the containment shell or liner
3.12.5
drive shaft
〈MDP〉 outer shaft of the magnetic drive coupling
3.12.6
secondary control
minimization of release of pumped liquid in the event of failure of the containment shell or stator liner
3.12.7
secondary control system
combination of devices (including, for example, a secondary pressure casing, a mechanical seal) that, in the event
of leakage from the containment shell or stator liner, minimizes and safely directs the release of pumped liquid
NOTE It includes provision(s) to indicate a failure of the containment shell or liner.
ISO 15783:2002(E)
Key
1 Hydraulic end 5 Stator assembly
2 Bearing 6 Rotor sheath
3 Liner 7 Rotor
4 Terminal box
Figure 1 — Example of a canned motor pump (CMP)

Key
1 Hydraulic end 6 Coupling
2 Bearing 7 Prime mover
3 Shell 8 Baseplate
4 Bearing housing 9 Sheath: inner magnet ring
5 Rolling bearing 10 Outer magnet ring
Figure 2 — Example of a magnetic drive pump (MDP)
6 © ISO 2002 – All rights reserved

ISO 15783:2002(E)
4 Design
4.1 General
4.1.1 Characteristic curve
The characteristic curve shall indicate the permitted operating range of the pump. Pumps should have a stable
characteristic curve. In addition, the characteristic curves for the smallest and largest impeller diameters shall also
be shown.
Minimum and maximum continuous stable flows at which the pump can operate without exceeding the noise,
vibration and temperature limits imposed by this International Standard shall clearly be stated by the
manufacturer/supplier.
4.1.2 Net Positive Suction Head (NPSH)
•••• The NPSH required (NPSHR) shall be based on cold water testing as determined by testing in accordance with
ISO 9906 unless otherwise agreed.
The manufacturer/supplier shall make available a typical curve as a function of flow for water. NPSHR curves shall
be based upon a head drop of 3 % (NPSH3).
Correction factors for hydrocarbons shall not be applied to the NPSHR curves.
Pumps shall be selected such that the minimum NPSH available (NPSHA) in the installation exceeds the NPSHR
of the pump by at least the specified safety margin. This safety margin shall be not less than 0,5 m, but the
manufacturer/supplier may specify a significantly higher margin depending on factors including the following:
 size, type, specific speed, hydraulic geometry or design of the pump;
 operating speed or inlet velocity;
 the pumped liquid and temperature;
 the cavitation erosion resistance of the construction materials.
4.1.3 Outdoor installation
The pumps shall be suitable for outdoor installation under normal ambient conditions.
•••• Local regulations or extraordinary ambient conditions, such as high or low temperatures, corrosive environment,
sandstorms, for which the pump is required to be suitable shall be specified by the purchaser.
4.2 Prime movers
4.2.1 General
The following shall be considered when determining the power/speed requirements of the pump.
a) The application and method of operation of the pump. For example, in an installation intended for parallel
operation, the possible performance range with only one pump in operation, taking into account the system
characteristic.
b) The position of the operating point on the pump characteristic curve.
c) The circulation flow for lubrication of bearings and removal of heat losses (especially for pumps with low rates
of flow).
ISO 15783:2002(E)
d) Properties of the pumped liquid (viscosity, solids content, density).
e) Power loss, including slip loss through transmission (only magnet drive pumps).
f) Atmospheric conditions at the pump site.
g) Starting method of the pump:
 if a pump (e.g. a stand-by pump) is started automatically then consideration shall be given to whether the
pump may start against a closed valve, or whether the pump may start against an open valve or be
pumping into an empty pipeline; i.e. operates within a pumping system in which the pump pressure is
provided only for pipeline friction losses.
h) For variable speed arrangements the minimum continuous speed shall be indicated by the manu-
facturer/supplier to ensure proper cooling and lubrication of the bearings.
Prime movers required as drivers for seal-less pumps covered by this International Standard shall have power
output ratings at least equal to the percentage of rated power input given in Figure 3, this value never being less
than 1 kW.
Where it appears that this will lead to unnecessary oversizing of the driver, an alternative proposal shall be
submitted for the purchaser's approval.
4.2.2 Magnetic drive pumps
When determining the permanent magnetic drive to be used, the following points shall be taken into consideration
in addition to the points a) to h) listed under 4.2.1.
a) The magnetic drive shall be selected for the allowed operating range with the selected impeller diameter at
operating temperature and taking into consideration the characteristics of the liquid to be pumped.
•••• If the density of the liquid of the normal operation is below 1 000 kg/m special agreements between the
manufacturer/supplier and purchaser for testing and cleaning shall be made.
b) Heat generated by eddy current losses, power losses in the shell, power losses in the bearings and power
losses due to liquid circulation shall be removed by pumped liquid or by supply of external cooling fluid.
c) The magnetic material temperature shall be maintained at or below rated values for the material used.
Magnetic materials should not be subject to irreversible losses.
d) The irreversible magnetic losses at operating temperatures of the magnetic drive shall be considered.
Fluids containing magnetically attracted particles should be avoided unless such particles can be effectively
removed.
Special arrangements may be provided to avoid formation of ice in air gaps when pumping cold liquids.
The magnetic drive shall be designed in such a manner that start-up will not cause the magnet assemblies to
decouple.
4.2.3 Canned motor pumps
Canned motors are generally cooled by circulation of pumped liquid or by the use of coolant liquid to remove heat
generated by the containment liner, eddy current losses, motor electrical losses and mechanical losses. Stator
winding temperatures shall be maintained at or below values established for the grade of insulation used.

8 © ISO 2002 – All rights reserved

ISO 15783:2002(E)
Figure 3 — Prime mover output, percentage of pump power input at rated conditions

When rating a canned motor the conditions listed below shall be taken into consideration in addition to points a) to
h) listed under 4.2.1:
 power losses within the canned rotor;
 power losses in the bearings;
 power losses due to liquid circulation;
 explosion protection requirements.
Manufacturers/suppliers shall specify external cooling requirements when required.
Stand-by units may require special arrangements for flushing and/or heating to prevent the settling out of solids, or
the formation of ice, or solidification or too low viscosity of the liquid to be pumped.
•••• The details of such arrangements should be agreed upon between the purchaser and manufacturer/supplier.
4.3 Critical speed, balancing and vibrations
4.3.1 Critical speed
The critical speed shall be calculated with liquid.
•••• For some pump types (e.g. vertical line shaft and horizontal multistage), the first critical speed may be below the
operating speed when agreed between the purchaser and manufacturer/supplier.
Particular attention shall be paid to the critical speed when the pump is to be driven at variable speed.
ISO 15783:2002(E)
4.3.2 Balancing and vibration
4.3.2.1 General
All major rotating components shall be balanced.
4.3.2.2 Horizontal pumps
Unfiltered vibration shall not exceed the vibration severity limits as given in Table 1 when measured on the
1)
manufacturer's/supplier's test facilities . These values are measured radially at the bearing housing at a single
operating point at rated speed (± 5 %) and rated flow (± 5 %) when operating without cavitation.
The manufacturer/supplier shall determine the grade of balancing required in order to achieve acceptable vibration
levels within the limits specified in this International Standard.
NOTE This can normally be achieved by balancing in accordance with grade G6.3 of ISO 1940-1.
Table 1 — Maximum allowable unfiltred vibration values
Values in millimetres per second (r.m.s.)
Pump type and criterion
Pump arrangement
Canned motor pump Magnetic drive pump
Pump with rigid support
2,3 3,0
centreline height u 225 mm
Pump with rigid support
3,0 4,5
centreline height > 225 mm
Pump with flexible support 3,0 4,5
NOTE The values of vibration velocity filtered for rotating frequency and blade passing
frequency can be expected to be lower than given in the table.

4.3.2.3 Vertical pumps
Vibration readings shall be taken on the top flange of the driver mounting on vertical pumps with rigid couplings and
near to the top pump bearing on vertical pumps with flexible couplings.
Vibration limits for both rolling and sleeve bearing pumps shall not exceed the vibration severity limits as given in
1)
Table 1 during shop test at rated speed (± 5 %) and rated flow (± 5 %) operating without cavitation .
4.4 Pressure-containing parts
4.4.1 Primary containment
Containment of the pumped liquid shall be by means able to withstand the stresses derived from the maximum
allowable working pressure and any dynamic effects of operation. The wetted materials shall be compatible with
each other and the pumped liquid, and shall be dimensioned to give an adequate working life.
It is recognized that several effective methods are suitable for the design of pressure-containing parts. These may
be based upon recognized national codes or upon other proven methods. To satisfy the acceptance criteria, each
design method shall
1) For in situ acceptance limits refer to ISO 10816-3.
10 © ISO 2002 – All rights reserved

ISO 15783:2002(E)
 be a written procedure,
 recognize limits of material stresses,
 incorporate a checking stage,
 have been proven empirically or experimentally.
4.4.2 Secondary containment
Where containment of any leakage is considered to be desirable, the pump shall be provided with a secondary
containment.
The secondary containment shall be designed to allow installation of a sensor by the purchaser to indicate change
in status and either to shut-down the pump or to warn that attention and rectification is required. The secondary
containment shall sustain this condition when exposed to the pumped liquid for a minimum of 48 h. It shall be
capable of containment under the maximum allowable working pressure, temperature and any dynamic effects
from operation.
4.4.3 Secondary control
Where the liquid is less hazardous, but uncontrolled leakage is unacceptable for environmental or personal comfort
reasons, the pump shall be provided with a means to control leakage from the primary containment.
Secondary control shall provide a safe means to collect leakage from the primary containment and present it in a
manner that will allow its safe disposal. The manufacturer/supplier shall define the maximum allowable working
pressure and provide a disposal connection capable of discharging 20 % of the pump flow rate without this
pressure being exceeded.
4.4.4 Pressure-temperature rating
The maximum allowable working pressure of the pump at the most severe operating conditions shall be clearly
stated by the manufacturer/supplier. In no case shall the maximum allowable working pressure of the pump exceed
the flange rating.
The basic design pressure of the pump shall be at least a gauge pressure of 16 bar at 20 °C when the tensile
requirements of the material permit.
In the case of materials whose strength does not permit the basic design pressure for 16 bar rating at 20 °C, or
where the pump is to be used at temperatures other than 20 °C, the pressure rating shall be adjusted according to
the stress-temperature characteristics of the material and shall be clearly stated by the manufacturer/supplier.
The containment shell/liner shall be resistant to a pressure of 0,1 bar absolute and designed for a gauge pressure
of 16 bar at 250 °C in the case of metallic materials, and to a vacuum of 0,5 bar absolute and a gauge pressure of
16 bar at 20 °C in the case of non-metallic materials.
4.4.5 Wall thickness
4.4.5.1 General
Pressure-containing parts, including containment shell/liner, shall be dimensioned so that they are capable of
withstanding the allowable working pressure at working temperature without deformation which interferes with the
safe operation of the pump. The test pressure shall not cause any permanent deformation in accordance with 6.3.1.
The casing shall also be suitable for the hydrostatic test pressure (see 6.3.1) at ambient temperature.
•••• The corrosion allowance for all pressure-containing parts, excluding the shell/liner, shall be agreed upon between
the purchaser and manufacturer/supplier by consideration of corrosion rates for the liquids and materials involved.
ISO 15783:2002(E)
4.4.5.2 Magnetic drive pumps
The containment shell shall be made of corrosion-resistant material of not less than 1 mm thickness, which shall
include an allowance for any corrosion loss, as agreed upon by the purchaser.
4.4.5.3 Canned motor pumps
The minimum wall thickness of the liner shall be 0,3 mm and be of corrosion-resistant material.
4.4.6 Materials
The materials used for pressure-containing parts shall depend on the liquid pumped and the application of the
pump (see clause 5).
4.4.7 Mechanical features
4.4.7.1 Dismantling
The pump shall preferably be designed in back-pull-out construction in order to permit removal of the impeller,
shaft, magnetic drive and bearing assembly without disturbing the inlet and outlet flange connections. Provision
shall be made for easy separation of components (e.g. jackscrews).
4.4.7.2 Jackscrews
When jackscrews are supplied as a means of separating contacting faces, the mating face shall be counter-bored
to receive the jackscrews where damage to the surface offers a possibility of a leaking joint or a poor fit. Socket
head screws shall be avoided, if possible.
4.4.7.3 Heating and cooling jackets
Jackets for heating and cooling shall be provided where required.
Heating jackets shall be designed for an operating pressure of at least 6 bar at 200 °C (steam) or 6 bar at 350 °C
(heat transfer fluid). Cooling jackets shall be designed for a minimum operating pressure of 6 bar at 170 °C.
The manufacturer/supplier shall specify when external heating or cooling is required. Annex E gives typical
systems.
4.4.7.4 Pressure-containment gaskets
Pressure-containment gaskets shall be of a design suitable for the allowable working conditions and for hydrostatic
test conditions. They shall be confined to the atmospheric side to prevent blow-out.
4.4.7.5 External bolting
Bolts or studs connecting pressure-containing parts, such as pump casing and cover including magnetic coupling
or canned motor, shall have a minimum size of 12 mm.
NOTE If owing to space limitations, the use of M 12 bolts or studs is impractible, smaller bolts or studs might be permitted.
The bolting selected (property class) shall be adequate for the maximum allowable pressure using the normal
tightening procedures. If at some point it is necessary to use fasteners of special quality, interchangeable fasteners
for other joints shall be of the same quality.
12 © ISO 2002 – All rights reserved

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