SIST EN ISO 5199:2004

SLOVENSKI STANDARD
01-september-2004
7HKQLþQHVSHFLILNDFLMH]DFHQWULIXJDOQHþUSDONH±5D]UHG,,,62
Technical specifications for centrifugal pumps - Class II (ISO 5199:2002)
Technische Anforderungen an Kreiselpumpen - Klasse II (ISO 5199:2002)
Spécifications techniques pour pompes centrifuges - Classe II (ISO 5199:2002)
Ta slovenski standard je istoveten z: EN ISO 5199:2002
ICS:
23.080 ýUSDONH Pumps
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 5199
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2002
ICS 22.080 Supersedes EN 25199:1992
English version
Technical specifications for centrifugal pumps - Class II (ISO
5199:2002)
Spécifications techniques pour pompes centrifuges - Technische Anforderungen an Kreiselpumpen - Klasse II
Classe II (ISO 5199:2002) (ISO 5199:2002)
This European Standard was approved by CEN on 11 March 2002.
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,
Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, 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
© 2002 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 5199:2002 E
worldwide for CEN national Members.

CORRECTED  2003-09-24
Foreword
This document (ISO 5199:2002) has been prepared by Technical Committee ISO/TC 115
"Pumps" in collaboration with 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 2002, and conflicting
national standards shall be withdrawn at the latest by September 2002.
This document supersedes EN 25199:1992.
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, Iceland, Ireland, Italy,
Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the
United Kingdom.
Endorsement notice
The text of ISO 5199:2002 has been approved by CEN as EN ISO 5199:2002 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 2858 1975 End-suction centrifugal pumps EN 22858 1993
(rating 16 bar) - Designation,
nominal duty point and
dimensions
ISO 3274 1996 Geometrical product EN ISO 3274 1997
specifications (GPS) - Surface
texture: Profile method - Nominal
characteristics of contact (stylus)
instruments
ISO 3661 1977 End-suction centrifugal pumps - EN 23661 1993
Baseplate and installation
dimensions
ISO 3744 1994 Acoustics - Determination of EN ISO 3744 1995
sound 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 EN ISO 3746 1995
sound power levels of noise
sources using sound pressure -
Survey method using an
enveloping measurement surface
over a reflecting plane
ISO 9906 1999 Rotodynamic pumps - Hydraulic EN ISO 9906 1999
performance acceptance tests -
Grades 1 and 2
ISO 9614-1 1993 Acoustics - Determination of EN ISO 9614-1 1995
sound power levels of noise
sources using sound intensity -
Part 1: Measurements at discrete
points
ISO 9614-2 1996 Acoustics - Determination of EN ISO 9614-2 1996
sound power levels of noise
sources using sound intensity -
Part 2: Measurement by
scanning
INTERNATIONAL ISO
STANDARD 5199
Second edition
2002-03-15
Technical specifications for centrifugal
pumps — Class II
Spécifications techniques pour pompes centrifuges — Classe II

Reference number
ISO 5199:2002(E)
©
ISO 2002
ISO 5199:2002(E)
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ii © ISO 2002 – All rights reserved

ISO 5199:2002(E)
Contents Page
Foreword.v
Introduction.vi
1 Scope .1
2 Normative references.1
3 Terms and definitions .2
4 Design.6
4.1 General.6
4.2 Prime movers .7
4.3 Critical speed, balance and vibration.8
4.4 Pressure-containing parts .9
4.5 Branches (nozzles) and miscellaneous connections .11
4.6 External forces and moments on flanges (inlet and outlet).11
4.7 Branch (nozzle) flanges .12
4.8 Impellers .12
4.9 Wear rings or equivalent components .12
4.10 Running clearance.12
4.11 Shafts and shaft sleeves.12
4.12 Bearings .14
4.13 Shaft sealing .15
4.14 Labelling .18
4.15 Couplings .18
4.16 Baseplate.19
4.17 Special tools.20
5 Materials .20
5.1 Selection of materials.20
5.2 Material composition and quality.20
5.3 Repairs.20
6 Shop inspection and tests.20
6.1 General.20
6.2 Inspection.20
6.3 Tests.21
6.4 Final inspection .22
7 Preparation for dispatch .22
7.1 Shaft seals.22
7.2 Preservation for transport and storage.22
7.3 Securing of rotating parts for transport.23
7.4 Openings .23
7.5 Piping and auxiliaries.23
7.6 Identification .23
Annex A (normative) Centrifugal pump — Data sheet .24
Annex B (informative) External forces and moments on branches.27
Annex C (normative) Enquiry, proposal, purchase order.40
Annex D (normative) Documentation after purchase order .41
Annex E (informative) Examples of seal arrangements .42
Annex F (informative) Piping arrangements for seals.45
ISO 5199:2002(E)
Annex G (informative) Designation examples using references from annexes E and F .53
Annex H (informative) Checklist .55
Bibliography .57

iv © ISO 2002 – All rights reserved

ISO 5199:2002(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.
International Standard ISO 5199 was prepared by Technical Committee ISO/TC 115, Pumps, Subcommittee SC 1,
Dimensions and technical specifications of pumps.
This second edition cancels and replaces the first edition (ISO 5199:1986), which has been technically revised.
Annexes A, C and D form a normative part of this International Standard. Annexes B, E, F, G and H are for
information only.
ISO 5199:2002(E)
Introduction
This International Standard is one of a set dealing with technical specifications of centrifugal pumps; they are
designated as Classes I, II and III. Class I comprises the most severe and Class III the least severe requirements.
The selection of the class to be used is in accordance with the technical requirements for the application for which
the pump is intended. The class chosen should be agreed between the purchaser and supplier. Furthermore,
additional safety requirements concerning the field of application should be taken into account.
However, it is not possible to standardize the class of technical requirements for centrifugal pumps for a certain
field of application, because each field of application comprises different requirements. All classes (I, II and III) can
be used in accordance to the different requirements of the pump application. So it may happen that pumps built in
accordance with Classes I, II and III may work beside one another in the one plant.
Further requirements covering specific applications or industries may be dealt with in separate standards.
Criteria for the selection of the required class of a pump for a certain application may include
— reliability,
— required operating life,
— operating conditions,
— environmental conditions, and
— local ambient conditions.
Cross-references in boldface and the checklist in annex H indicate where a decision may be required by the
purchaser, or where agreement is required between the purchaser and the manufacturer/supplier.

vi © ISO 2002 – All rights reserved

INTERNATIONAL STANDARD ISO 5199:2002(E)

Technical specifications for centrifugal pumps — Class II
1 Scope
1.1 This International Standard specifies the requirements for Class II centrifugal pumps of single-stage,
multistage, horizontal or vertical construction, with any drive and any installation for general application. Pumps
used in the chemical process industries (e.g. those conforming to ISO 2858) are typical of those covered by this
International Standard.
1.2 This International Standard includes design features concerned with installation, maintenance and safety for
these pumps including baseplate, couplings and auxiliary piping, but it does not specify any requirements for the
driver other than those related to its rated power output.
1.3 Where application of this International Standard has been called for and requires a specific design feature,
alternative designs may be offered which meet the intent of this International Standard provided that the alternative
is described in detail.
Pumps not complying with all the requirements of this International Standard may be offered for consideration
provided that all deviations are stated.
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 281-1, Rolling bearings — Dynamic load ratings and rating life — Part 1: Calculation methods
ISO 2858, End-suction centrifugal pumps (rating 16 bar) — Designation, nominal duty point and dimensions
ISO 3069, End-suction centrifugal pumps — Dimensions of cavities for mechanical seals and for soft packing
ISO 3274, Geometrical Product Specifications (GPS) — Surface texture: Profile method — Nominal characteristics
of contact (stylus) instruments
ISO 3661, End-suction centrifugal pumps — Baseplate and installation dimensions
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 7005-1, Metallic flanges — Part 1: Steel flanges
ISO 5199:2002(E)
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
ISO 9614-1, Acoustics — Determination of sound power levels of noise sources using sound intensity — Part 1:
Measurement at discrete points
ISO 9614-2, Acoustics — Determination of sound power levels of noise sources using sound intensity — Part 2:
Measurement by scanning
3 Terms and definitions
For the purposes of this International Standard, the following terms and definitions apply.
3.1
operating conditions
all parameters (e.g. operating temperature, operating pressure) determined by a given application and pumped
liquid
NOTE These parameters will influence the type of construction and construction materials.
3.2
allowable operating range
range of flows or heads at the specified operating conditions of the pump supplied as limited by cavitation, heating,
vibration, noise, shaft deflection and other similar criteria
NOTE The upper and lower limits of the range are denoted by maximum and minimum continuous flow.
3.3
rated conditions
conditions (driver excluded) that define the guarantee values necessary to meet all defined operating conditions,
taking into account any necessary margins
3.4
driver rated power output
greatest continuous driver power output permitted under defined conditions
3.5
basic design pressure
pressure derived from the permitted stresses at 20 °C of the material used for the pressure-containing parts
3.6
maximum allowable working pressure
pressure for a component on the basis of materials used and on the basis of calculation rules at the specified
operating temperature
3.7
rated inlet pressure
inlet pressure of the operating conditions at the guarantee point
3.8
rated outlet pressure
outlet pressure of the pump at the guarantee point with rated flow, rated speed, rated inlet pressure and density
2 © ISO 2002 – All rights reserved

ISO 5199:2002(E)
3.9
pressure/temperature limit
limiting pressure and temperature of a component at given design and material (see Figure 1)
3.10
corrosion allowance
that portion of the wall thickness of the parts wetted by the pumped liquid in excess of the theoretical thickness
required to withstand the pressure limits given at the most severe operating conditions
3.11
maximum allowable continuous speed
highest speed at which the manufacturer will permit continuous operation
3.12
trip speed
speed at which the independent emergency overspeed devices operate to shut down a prime mover
3.13
first critical speed
speed of rotation at which the first (lowest) lateral natural frequency of vibration of the rotating parts corresponds to
the frequency of rotation
3.14
design radial load
radial load of the pump rotor for which the bearing system is selected
3.15
maximum radial load
greatest radial load of the pump rotor resulting from operating the pump at any condition within its allowable
operating range
3.16
shaft runout
total radial deviation indicated by a device measuring the shaft position in relation to the bearing housing, as the
shaft is rotated manually in its bearings with the shaft in the horizontal position
3.17
face runout
total axial deviation indicated at the outer radial face of the shaft seal casing by a device attached to and rotated
with the shaft when the shaft is rotated manually in its bearings in the horizontal position
NOTE The radial face is that which determines the alignment of a seal component.
3.18
shaft deflection
displacement of a shaft from its geometric centre in response to the radial hydraulic forces acting on the impeller
NOTE Shaft deflection does not include shaft movement caused by tilting within the bearing clearances, bending caused
by impeller unbalance, or shaft runout.
3.19
seal flush
circulation
return of pumped liquid from high pressure area to seal cavity
NOTE This can be by external piping or internal passage and is used to remove heat generated at the seal or to maintain
positive pressure in the seal cavity or treated to improve the working environment for the seal. In some cases it may be
desirable to circulate from the seal cavity to a lower pressure area (e.g. the inlet).
ISO 5199:2002(E)
3.20
injection flush
introduction of an appropriate (clean, compatible, etc.) liquid into the seal cavity from an external source and then
into the pumped liquid
NOTE Injection flush is used for the same purpose as circulation and also to provide an improved working environment for
the seal.
3.21
quenching
continuous or intermittent introduction of an appropriate (clean, compatible, etc.) fluid at lower than seal chamber
pressure on the atmospheric side of the main shaft seal
NOTE It is used to exclude air or moisture, to prevent or clear deposits (including ice), lubricate an auxiliary seal, snuff out
fire, dilute, heat or cool leakage.
3.22
barrier fluid
fluid which is introduced between dual mechanical seals to completely isolate the pump process liquid from the
environment
NOTE The pressure of the barrier fluid is always higher than the process pressure being sealed.
3.23
buffer fluid
fluid used as a lubricant or buffer between dual mechanical seals
NOTE The fluid is always at a pressure lower than the pump process pressure being sealed.
3.24
pump H(Q) curve
pump head capacity curve
pump characteristic curve
relationship between the total head of the pump and the rate of flow at given operating/rated conditions of speed
and liquid
3.25
net positive suction head 3 %
NPSH3
net positive suction head required to limit to 3 % the fall in the total head of the first stage of the pump
NOTE It is the basic standard used in performance curves.
See Figure 1.
4 © ISO 2002 – All rights reserved

ISO 5199:2002(E)
Key
1 Pressure-temperature limit of a component
2 Fluid operating field including tolerances

p Pressure t Temperature
p t
Hydrostatic test pressure Hydrostatic test temperature
test test
p t
Basic design pressure Minimum operating temperature
N min,op
p t
Maximum allowable working pressure Maximum operating temperature
all,w max,op
p t Maximum allowable working temperature at
Maximum outlet operating pressure
2max,op max,all w
maximum outlet pressure
p2min,op Minimum outlet operating pressure
Figure 1 — Pressure–containing part, pressure/temperature rating
ISO 5199:2002(E)
4 Design
4.1 General
4.1.1 Documents
Whenever the documents include conflicting technical requirements, they shall be applied in the following
sequence:
a) purchase order (or enquiry if no order is placed) (see annexes C and D);
b) data sheet (see annex A);
c) the requirements of this International Standard;
d) other standards to which reference is made in the order (or enquiry if no order is placed).
4.1.2 Pump H(Q) curve (characteristic curve)
The manufacturer/supplier shall make available the characteristic curve which shall indicate the allowable operating
range of the pump as supplied. Characteristic curves of the smallest and largest impeller diameter shall be plotted
on the performance chart for pumps conforming to ISO 2858 and for other pump types when requested by the
purchaser.
Pumps with a stable characteristic curve are preferred.
If specified by the purchaser, it shall be possible for pumps that are to be used with constant speed drives to
increase the head by approximately 5 % at rated conditions by installing new, larger or different impeller or
impellers.
The position of the duty point in the flow range relative to the best efficiency point should be decided by the
purchaser as a function of the specific application and anticipated variation in flow for optimum operation.
4.1.3 Net positive suction head (NPSH)
The NPSH required (NPSHR) shall be based on cold water as determined by testing in accordance with ISO 9906
unless otherwise agreed.
The manufacturer/supplier shall make available the NPSHR curve as a function of flow for water. NPSHR curves
shall be net positive suction head 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 no 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;
 the pumped liquid;
 the cavitation erosion resistance of the construction materials.
6 © ISO 2002 – All rights reserved

ISO 5199:2002(E)
4.1.4 Outdoor installation
The pump shall be suitable for outdoor installation under environmental conditions specified by the manufacturer/
supplier.
Any different local environmental conditions, such as high or low temperatures, corrosive environment, sand
storms, for which the pump must be suitable shall be specified by the purchaser.
4.2 Prime movers
The following shall be considered when determining the rated performance of the drive:
a) application and method of operation of the pump; for instance in the case of parallel operation, the possible
performance range with only one pump in operation taking into account the system characteristic shall be
considered;
b) position of the operating point on the pump characteristic curve;
c) shaft seal friction loss;
d) circulation flow for the mechanical seal (especially for pumps with low rate of flow);
e) properties of pumped liquid (viscosity, solids content, density);
f) power and slip loss through transmission;
g) atmospheric conditions at pump site;
h) start-up of the pump.
In assessing the required speed torque characteristic of the driver, consideration shall be given to the system
characteristics, in particular whether or not the pump is to be started manually or automatically with an open or
closed discharge valve, or is to be used to fill the discharge main.
Prime movers required as drivers for any pumps covered by this International Standard shall have power output
ratings at least equal to the percentage of rated pump power input given in Figure 2, 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.

ISO 5199:2002(E)
Figure 2 — Rated driver output, percentage of pump power input at rated conditions
4.3 Critical speed, balance and vibration
4.3.1 Critical speed
Under operating conditions, the actual first lateral critical speed of the rotor when coupled to the drive agreed upon
shall be at least 10 % above the maximum allowable continuous speed including the trip speed of a turbine-driven
pump.
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
when the pump is to be driven at variable speeds.
4.3.2 Balance 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/suppliers 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.

1) Refer to ISO 10816-3 for in situ tests only.
8 © ISO 2002 – All rights reserved

ISO 5199:2002(E)
Table 1 — Maximum allowable vibration severity
Maximum values of r.m.s.
vibration velocity, mm/s
Pump arrangement Pump type
h u 225 h > 225
Pump with rigid support horizontal pumps 3,0 4,5
Pump with flexible support horizontal pumps 4,5 7,1
All vertical pumps 7,1
In Table 1, h is the centreline height of the pump, and a rigid support is one where the lowest natural frequency of
the combined machine and support system in the direction of measurement is at least 25 % higher than the
rotational frequency. Any other support is considered flexible.
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 For information, this can normally be achieved by balancing in accordance with grade G6.3 of ISO 1940-1.
The filtered values for rotating frequency and blade passing frequency may be expected to be lower than given in
Table 1.
Pumps with a special impeller, for example a single channel impeller, may exceed the limits given in Table 1. In
such a case the manufacturer/supplier should indicate this in his offer.
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
Table 1 when measured on the manufacturer/suppliers test facilities at rated speed (± 5 %) and rated flow (± 5 %)
operating without cavitation.
4.4 Pressure-containing parts
4.4.1 Pressure/temperature rating
The maximum allowable working pressure of the pump at the most severe operating conditions shall be clearly
defined by the manufacturer. In no case shall the maximum allowable working pressure of the pump (casing and
cover including shaft seal housing and gland follower/end plate) exceed that of the pump flanges (also see 4.5.2).
For pumps complying to ISO 2858 the following shall apply:
a) the basic design pressure of the pump shall be at least a gauge pressure of 16 bar at 20 °C when made of cast
iron, ductile iron, carbon steel or stainless steel;
b) for materials the tensile requirements of which do not permit the 16 bar rating, the pressure/temperature rating
shall be adjusted according to the stress temperature rating for the material and shall be clearly stated by the
manufacturer/supplier.
4.4.2 Wall thickness
Pressure casings including the shaft seal housing and gland end plate shall be of such thickness as will be suitable
for containing pressure and limiting distortion under the maximum allowable pressure at the operating temperature.
ISO 5199:2002(E)
The casing shall also be suitable for the hydrostatic test pressure (see 6.3.3) at ambient temperature.
The pressure-containing parts shall have a corrosion allowance of 3 mm when required by the purchaser.
4.4.3 Materials
The materials used for pressure-containing parts shall depend on the liquid pumped and the application of the
pump (see clause 5).
4.4.4 Mechanical features
4.4.4.1 Dismantling
With the exception of vertical lineshaft pumps and ring-section type multistage pumps, the pump preferably should
be designed to permit removal of the impeller, shaft, shaft seal and bearing assembly without disturbing the inlet
and outlet flange connections. For end-suction pumps where back pull-out construction is not available, this shall
be stated by the manufacturer/supplier.
4.4.4.2 Jackscrews
When jackscrews are supplied as a means of separating contacting faces, one of the faces shall be relieved
(counterbored or recessed) to avoid the possibility of creating a leak or poor fit. There shall be a sufficient number
of jackscrews to ensure components can be separated without the need for undue force or risk of damage to the
components. Hollow head screws should be avoided, if possible.
4.4.4.3 Jackets
Jackets for heating or cooling the casing or stuffing box, or both, are optional. Jackets shall be designed at an
operating pressure of at least 6 bar at 170 °C. In certain applications it may be necessary to design heating jackets
to 16 bar at 200 ºC (for steam) or to 6 bar at 350 ºC (for heat transfer oil).
4.4.4.4 Casing gaskets
Casing gaskets shall be of a design suitable for the hydrostatic test pressure of the pump. For radial split casings
the casing-cover gaskets shall be confined on the atmospheric side to prevent blow-out.
4.4.4.5 Vapour venting
A pump handling a liquid at a pressure near its vapour pressure or with a gas content shall be designed so that the
vapours can be properly vented.
4.4.4.6 External bolting
Bolts or studs that connect parts of the pressure casing, including shaft seal housing, shall be preferably not
smaller than 12 mm diameter (ISO metric thread). If due to space limitations, the use of 12 mm bolts or studs is
impractical, smaller bolts or studs may be used.
The bolting selected (property class) shall be adequate for the maximum allowable working pressure of the pump
and for normal tightening procedures. If at some point it is necessary to use a fastener of special quality,
interchangeable fasteners for other joints shall be of the same quality. Hollow-head screws should be avoided if
possible.
4.4.4.7 Casing support for high temperature
For high temperature applications above 175 °C, due consideration should be given to supporting the pump casing
at the centreline.
10 © ISO 2002 – All rights reserved

ISO 5199:2002(E)
4.5 Branches (nozzles) and miscellaneous connections
4.5.1 Extent
For the purposes of this International Standard, the terms branch and nozzle are synonymous.
This subclause is concerned with all fluid connections to the pump whether for operation or maintenance.
4.5.2 Inlet and outlet branches
For end-suction pumps, inlet and outlet branches shall be flanged and designed for the same pressure rating. For
other pump types (e.g. multistage pumps), different pressure ratings for inlet and outlet branches are permissible in
which case the manufacturer/supplier shall state that this is so and emphasise the requirement for pressure relief.
4.5.3 Vent pressure-gauge and drain
Means for venting all areas of casing and seal chamber shall be provided unless the pump is made self-venting by
arrangement of branches.
Provision shall be made for the connection of pressure gauges at the inlet and outlet branches but these
connections shall not be drilled unless specified in the enquiry and/or order.
Provision shall be made for draining at the lowest point, or points of the pump. The enquiry and/or order should
state whether such connections are required to be drilled and to be fitted with a plug or other closures.
4.5.4 Closures
The material for closures used in operation (plugs, blank/blind flanges, etc.) shall be appropriate for the pumped
liquid. Attention shall be paid to the suitability of material combinations for corrosion resistance and to minimize the
risk of seizure or galling of screw threads.
All openings exposed to the pumped liquid under pressure, including all shaft seal openings, shall be fitted with
removable closures adequate to contain pressure.
4.5.5 Auxiliary pipe connections
All auxiliary pipe connections shall meet the compatibility requirements of material, size and thickness as specified
for auxiliary piping (see 4.13.6).
Auxiliary piping shall be provided with detachable joints to permit easy dismantling. The type of connection shall be
subject to agreement. In any case, connections equal to or greater than 25 mm diameter shall be flanged.
4.5.6 Connection identification
All connections shall be identified in the installation drawing in accordance with their duty and function. It is
recommended that this identification also be applied on the pump.
4.6 External forces and moments on flanges (inlet and outlet)
The purchaser shall calculate the forces and moments exerted by the piping on the pump and check that they do
not exceed allowable values. If the loads are higher than permissible, the solution shall be agreed between the
purchaser and the manufacturer/supplier.
The method given in annex B is recommended to be used for pumps with flexible couplings unless another method
is agreed upon between the purchaser and the manufacturer/supplier.
ISO 5199:2002(E)
4.7 Branch (nozzle) flanges
The flange envelope shall be of a size to enable flanges in accordance with the relevant part of ISO 7005 to be
provided. If the pump manufacturers standard pattern entails a flange thickness and a diameter greater than that of
the rating specified, the heavier flange may be supplied, but it shall be faced and drilled as specified. Good seating
of the bolt head and/or nut on the back face of cast flanges shall be ensured. Bolt holes shall straddle the
centreline.
4.8 Impellers
4.8.1 Impeller design
Impellers of closed, semi-open or open designs may be selected according to the application. Cast or welded
impellers shall consist of one piece, excluding wear rings.
Impellers fabricated by other means are permissible in special cases, i.e. for small impeller outlet widths or of
special materials. This, however, requires agreement with the purchaser.
4.8.2 Securing of impellers
Impellers shall be secured against circumferential and axial movement when rotating in the intended direction.
4.8.3 Axial adjustment
If field adjustment of impeller axial clearance is required, external means shall be provided. If adjustment is
achieved by axial movement of the rotor, attention shall be paid to the possibly dangerous effect on the mechanical
seal(s) (see also 4.11.6).
4.9 Wear rings or equivalent components
Wear rings should be fitted where appropriate. When wear rings are fitted, they shall be renewable and securely
locked to prevent rotation.
4.10 Running clearance
When establishing running clearances be
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