SIST EN ISO 3661:2012

• Abstract:

  Specifies basic dimensions and gives alternative numbers and locations of baseplate fixing holes to suit individual installations. Covers the baseplate numbers from 2 to 9. The data given are intended primarily for use with pumps in accordance with ISO 2858, coupled to foot-mounted electric motors for installation on a foundation.

• Status: Published
• Public Enquiry End Date: 24-Sep-2010
• Publication Date: 22-Nov-2011
• ICS: 23.080 - Pumps
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 16-Nov-2011
• Due Date: 21-Jan-2012
• Completion Date: 23-Nov-2011
• Ref Project: EN ISO 3661:2010 - End-suction centrifugal pumps - Baseplate and installation dimensions (ISO 3661:1977)

• Replaces: SIST EN 23661:2000 - End-suction centrifugal pumps - Baseplate and installation dimensions (ISO 3661:1977)
• Effective Date: 01-Jan-2011
• Refers: SIST EN 1434-1:1997/A1:2002 - Heat meters - Part 1: General requirements
• Effective Date: 28-Jan-2026
• Refers: SIST EN 1264-4:2002 - Floor heating - Systems and components - Part 4: Installation
• Effective Date: 28-Jan-2026
• Refers: SIST EN 12365-4:2003 - Building hardware - Gasket and weatherstripping for doors, windows, shutters and curtain walling - Part 4: Recovery after accelerated ageing test method
• Effective Date: 28-Jan-2026

SIST EN ISO 3661:2012 is the Slovenian adoption of EN ISO 3661 for end-suction centrifugal pumps. It specifies baseplate and installation dimensions, including alternative fixing-hole arrangements, for pump-and-motor assemblies installed on a foundation. The standard is intended mainly for pumps in accordance with ISO 2858 coupled to foot-mounted electric motors.

What does SIST EN ISO 3661:2012 specify?

SIST EN ISO 3661:2012 specifies the basic baseplate and installation dimensions for end-suction centrifugal pumps, and it gives alternative numbers and locations of baseplate fixing holes to suit different installations. It covers baseplate numbers 2 to 9.

The standard is organized into:

• Clause 1 Scope
• Clause 2 Field of application
• Clause 3 References
• Clause 4 Baseplate dimensions
• Clause 5 Basic installation dimensions

It also contains Figure 1 and Tables 1 and 2, which carry the dimensional data and the selection rules used in practice.

What are the key requirements of SIST EN ISO 3661:2012?

SIST EN ISO 3661:2012 is a dimensional standard rather than a performance standard. Its main task is to help designers, manufacturers and installers match the pump, motor and baseplate before the assembly is mounted on a foundation.

1) Use the standard for the intended pump-and-motor arrangement

Clause 2 says the data are intended primarily for centrifugal pumps in accordance with ISO 2858, coupled to foot-mounted electric motors. In practice, this means the standard is meant for selecting a baseplate and setting out the installation for a common pump-motor set, not for defining hydraulic performance.

2) Select a baseplate number from the defined range

Clause 1 and Table 1 cover baseplate numbers 2 to 9. That matters because the baseplate number is the starting point for choosing the overall dimensions and the hole pattern that fit the installation.

3) Use Table 1 and Figure 1 for the baseplate dimensions

Clause 4 says the baseplate dimensions and reference numbers are given in Figure 1 and Table 1. Figure 1 shows the basic layout, while Table 1 gives the dimensional values for each baseplate number. For the user, this is the information needed to check whether a baseplate will fit the available space and match the pump set.

4) Use Table 2 to match pump size and motor frame size to the baseplate

Clause 5 says the appropriate baseplate number is taken from Table 2 using the pump designation and the electric motor frame number. The same table then gives the basic installation dimensions. In practice, this is the key selection step for design and procurement.

5) Follow the rule on pump and motor centre-line height

Table 2 uses a bold dividing line to show whether the pump centre-line height or the electric motor centre-line height governs. This matters because the installation height is set by whichever component is higher, so the designer can avoid an assembly that cannot be aligned on the foundation.

6) Use the fixing-hole options as permitted by the pump manufacturer

Figure 1 shows five hole positions, A, B, C, D and E, but the notes state that baseplates may have either four holes A, B, C and D or three holes A, C and E, as determined by the pump manufacturer. This gives installation flexibility while keeping the hole pattern controlled.

7) Read the height notes correctly

The notes explain that hmax includes packing between the baseplate and the pump or motor, and that the actual height may be less. They also state that additional sub-structures, such as feet for free-standing installations and vibration dampers, are not included in Hmax and hmax. For the installer, this means the published heights are not a complete substitute for the full installation design.

8) Understand what the table dimensions represent

The notes to Table 1 state that L1 and S1 are the length and width of the working surface and do not include casting slope. In practice, this prevents confusion between the usable mounting surface and the full cast shape.

Which standards are used with SIST EN ISO 3661:2012?

SIST EN ISO 3661:2012 refers to several related standards:

• ISO 2858 - defines end-suction centrifugal pumps, including designation, nominal duty point and dimensions.
• ISO/R 273, replaced by ISO 273(all parts) - gives clearance holes for metric bolts.
• IEC Publication 72, replaced by IEC 60072-1 - gives dimensions and output ratings for rotating electrical machines, including frame numbers and flange numbers.

These references are important because the baseplate dimensions depend on the pump standard, the motor frame size and the bolt-hole geometry.

What changed in SIST EN ISO 3661:2012 from the previous edition?

SIST EN ISO 3661:2012 replaces SIST EN 23661:2000. The European foreword says the content is identical to EN 23661 and that the numbering was changed to align with the ISO collection numbering. The foreword also notes that the standard supersedes EN 23661:1993.

What does the SIST EN ISO 3661:2012 document contain?

The document contains the dimensional layout for the baseplate, a table of baseplate reference numbers and dimensions, and a table that links pump and motor sizes to the correct baseplate number and installation dimensions. It also includes a figure showing the basic baseplate and installation dimensions and the possible fixing-hole positions.

For design work, the tables support selection and layout. For manufacturing and installation, they provide the dimensions needed to make, check and mount the baseplate and the pump-motor set on a foundation.

SLOVENSKI STANDARD
01-januar-2012
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SIST EN 23661:2000
6HVDOQDFHQWULIXJDOQDþUSDOND0HUHRVQRYQHSORãþHLQYJUDGQHPHUH,62

End-suction centrifugal pumps - Baseplate and installation dimensions (ISO 3661:1977)
Saugende Kreiselpumpen - Grundplatten- und Montagemaße (ISO 3661:1977)
Pompes centrifuges à aspiration en bout - Dimensions relatives aux socles et à
l'installation (ISO 3661:1977)
Ta slovenski standard je istoveten z: EN ISO 3661:2010
ICS:
23.080 ýUSDONH Pumps
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 3661
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2010
ICS 23.080 Supersedes EN 23661:1993
English Version
End-suction centrifugal pumps - Baseplate and installation
dimensions (ISO 3661:1977)
Pompes centrifuges à aspiration en bout - Dimensions Saugende Kreiselpumpen - Grundplatten- und
relatives aux socles et à l'installation (ISO 3661:1977) Montagemaße (ISO 3661:1977)
This European Standard was approved by CEN on 4 December 2010.

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 CEN-CENELEC 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 CEN-CENELEC Management Centre has the same
status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2010 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 3661:2010: E
worldwide for CEN national Members.

Contents Page
Foreword .3

Foreword
The text of ISO 3661:1977 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 3661:2010 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 June 2011, and conflicting national standards shall be withdrawn at
the latest by June 2011.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 23661:1993.
This document replaces and cancels the EN 23661 "End-suction centrifugal pumps - Baseplate and
installation dimensions (ISO 3661:1977) - German version EN 23661:1993": its content is identical to the EN
23661, only the numbering of the standard has been changed, to be consistent with the ISO collection
numbering.
Attention is drawn on the fact that some references cited in the standard have evolved:
ISO/R 273 replaced by ISO 273(all parts).
IEC Publication 72 replaced by IEC 60072-1.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 3661:1977 has been approved by CEN as a EN ISO 3661:2010 without any modification.

INTERNATIONAL STANDARD.
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION l MEXAYHAPO,ljHAJl OPI-AHW3AUMR l-f0 CTAHAAPTM3ALWWi~ORGANISATiON INTERNATIONALE DE NORMALISATION
End-suction centrifugal Pumps - Baseplate and installation
dimensions
Pompes ten trifuges 2 aspiration en bout -
Dimensions relatives aux socles et a I’instaIIation
First edition - 1977-02-15
UDC 621.671 Ref. No. ISO 36614977 (E)
Descriptors : centrifugal Pumps, specifications, holders, installing, dimensions.
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