CEN/TR 13931:2009

SLOVENSKI STANDARD
01-april-2009
1DGRPHãþD
SIST CR 13931:2001
&HQWULIXJDOQHþUSDONH6LOHLQPRPHQWLQDSULUREQLFDK&HQWULIXJDOQHPHãDQHLQ
DNVLDOQHþUSDONHVKRUL]RQWDOQLPLLQYHUWLNDOQLPLJUHGPL
Rotodynamic pumps - Forces and moments on flanges - Centrifugal, mixed flow and
axial flow horizontal and vertical shafts pumps
Rotodynamische Pumpen - Zulässige Flanschenkräfte und Momente - Kreiselpumpen,
Halbaxialaufpumpen und Axialpumpen mit horizontaler und verticaler Achse
Pompes rotodynamiques - Forces et moments applicables aux brides - Pompes
centrifuges, hélico-centrifuges et hélices à axes horizontal et vertical
Ta slovenski standard je istoveten z: CEN/TR 13931:2009
ICS:
23.080 ýUSDONH Pumps
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

TECHNICAL REPORT
CEN/TR 13931
RAPPORT TECHNIQUE
TECHNISCHER BERICHT
January 2009
ICS 23.080 Supersedes CR 13931:2000
English Version
Rotodynamic pumps - Forces and moments on flanges -
Centrifugal, mixed flow and axial flow horizontal and vertical
shafts pumps
Pompes rotodynamiques - Forces et moments applicables Rotodynamische Pumpen - Zulässige Flanschenkräfte und
aux brides - Pompes centrifuges, hélico-centrifuges et Momente - Kreiselpumpen, Halbaxialaufpumpen und
hélices à axes horizontal et vertical Axialpumpen mit horizontaler und verticaler Achse
This Technical Report was approved by CEN on 13 October 2008. It has been drawn up by the Technical Committee CEN/TC 197.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, 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
© 2009 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TR 13931:2009: E
worldwide for CEN national Members.

Contents Page
1 Scope . 4
2 Normative references . 4
3 Responsibilities of manufacturer and purchaser . 4
3.1 General . 4
3.2 Design considerations . 4
4 Criteria adopted in setting limiting forces and moments . 5
4.1 Shaft-end movement . 5
4.2 Distortion of the pump casing . 5
4.3 Validity of force and moment values – Effects of materials and temperature . 5
5 Horizontal shaft pumps . 6
5.1 Definition of pump families and summary of features . 6
5.2 Calculation of maximum permissible forces and moments . 11
5.3 Maximum permissible forces and moments on standardised or modular pump families . 14
5.3.1 General . 14
5.3.2 Composition of forces and moments . 14
5.3.3 Possibility of adapting the tables to other pumps of similar design . 14
5.4 Other horizontal pump families . 14
5.5 Practical considerations for horizontal shaft pumps . 14
6 Vertical shaft pumps . 15
6.1 Definition of pump families and summary of features . 15
6.1.1 Installation types. 15
6.1.2 Position(s) of flange(s) . 16
6.2 Calculation of maximum permissible forces and moments . 19
6.3 Maximum permissible forces and moments on pump flanges . 21
6.3.1 General . 21
6.3.2 Suspended shaft pumps generally used for transporting water ("for water") . 21
6.3.3 "In line" pumps . 22
6.4 Practical considerations for vertical shaft pumps . 22
Annex A (informative) Horizontal shaft pumps - Calculation of forces and moments for reinforced
and/or concrete mountings for families 2, 3.B, 3.C, 5.A, 5.B, 6, 7 and 8 . 23
Annex B (informative) Specifications relating to additional possibilities . 24
B.1 General . 24
B.2 Horizontal pumps only . 24
B.2.1 Pump stopped . 24
B.2.2 Reinforced and/or concrete mounting . 24
B.3 Horizontal and vertical pumps . 27
B.3.1 Prestressing on the pipework . 27
B.3.2 Weighting or compensation formula . 27
B.3.3 Limit of accumulation of possibilities . 28
Bibliography . 29

Foreword
This document (CEN/TR 13931:2009) has been prepared by Technical Committee CEN/TC 197 “Pumps”, the
secretariat of which is held by AFNOR.
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 CR 13931:2000.
The pumps families are numbered sequentially, leaving room for the inclusion of additional types if required at a later
date:
 horizontal shaft pumps: N° 1 to 8 ;
 vertical shaft pumps: N° 20 to 36 .
The pump families are described and illustrated in Tables 2 and 5.
Annexes A and B are for information only.

1 Numbers 9 to 19 are reserved for potential new families of pumps.
1 Scope
This CEN Technical Report provides information for the calculation of maximum permissible forces and moments
allowed on the flanges of various types of horizontal and vertical shaft rotodynamic pumps, caused by the reaction to
pipework that is rigidly connected to the installation. This document does not take into account the effect of any elastic
or deformable linkages, such as bellows, elastic joints, self butting sliding joints, etc.
This CEN Technical Report is not applicable to multistage monobloc pumps, whose outlets are remote from the
installation plane, or to horizontal shaft pumps mounted vertically for installation reasons, such as, fixing to a vertical
wall.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references,
only the edition cited applies. For undated references, the latest edition of the referenced document (including any
amendments) applies.
EN 22858, End-suction centrifugal pumps (rating 16 bar) - Designation, nominal duty point and dimensions (ISO
2858:1975)
EN ISO 5199:2002, Technical specifications for centrifugal pumps - Class II (ISO 5199:2002)
API 610, Centrifugal pumps for general refinery service
3 Responsibilities of manufacturer and purchaser
3.1 General
The manufacturer should inform the purchaser of the family to which the equipment offered belongs.
The purchaser should calculate the loads applied to the pump at its flanges, considered for all possible relevant
conditions (at ambient temperature, at operating temperature, at rest, under pressure).
The purchaser should ensure that the values of these loads do not exceed the corresponding calculated limits for the
pump selected. If they do, the pipework should be modified to reduce the loads, or a different type of pump, capable of
withstanding higher loads, shall be selected.
Both parties should agree on the type of baseplate to be provided (conventional, reinforced, concrete, etc.).
The basic values given in Tables 2 and 5 and Annex B correspond to the most common sizes of pumps; for larger
sizes of pumps, the manufacturer shall indicate the limiting values.
3.2 Design considerations
Excessive loads transmitted to a pump by the piping can compromise smooth running and reduce the life of the pump,
the coupling and perhaps the motor bearings, increase the demand for maintenance and, in the extreme, will cause
failure. These adverse effects result from two distinct causes:
 displacement of the pump shaft end relative to that of the driver. The misalignment will overload the pump and
driver bearings and, when a flexible coupling is used, increase its rate of wear.
 distortion of the pump casing, changing the internal clearances between the fixed and rotating parts, thus
increasing wear and vibrations, sometimes leading to seizure. If mechanical seals are installed, parallelism of
the faces will be upset, causing leakage and rapid breakdown.
It is for these reasons that limits must be set to the external forces and moments acting on the flanges. Manufacturers
are responsible for verifying that the pump offered will operate satisfactorily when these limits are not exceeded.
4 Criteria adopted in setting limiting forces and moments
4.1 Shaft-end movement
The lateral displacement of the shaft-end, relative to a fixed point in space, is given in Table 1 for the various pump
families, as a function of shaft size.
Table 1 — Criteria for forces and moments limitations
Type of pump Families Shaft-end diameter Displacement
(mm) (mm)
Standard (N) 1A, 1B < 30 (N24) 0,15
Modular 3A 31-40 (N32) 0,20
4A, 4B > 40 (N42) 0,25
Other horizontal 2, 3B, 3C 0,125
≤ 50
Pumps 5A, 5B > 50 0,175
6, 7, 8A, 8B, 8C 0,175
> 50
Vertical pumps All All 0,150
(20A-36B)
4.2 Distortion of the pump casing
It is the responsibility of the pump manufacturer to verify that the loads applied on the flanges, in any of the
permitted combinations, do not cause greater changes in internal clearance or disturbances to the mechanical
seals than are allowed by his own design rules or those of the specifications imposed by the user, whichever are
the more stringent.
4.3 Validity of force and moment values – Effects of materials and temperature
Unless indicated otherwise, the values for forces and moments are given for the basic material for the pump family (see
Tables 2 and 5) and for a maximum permissible temperature as shown. For other materials and higher temperatures,
the values shall be corrected by applying the modulus of elasticity relation, namely:
E
tm
E
20b
where
E modulus of elasticity of the basic material at 20 °C
20b
E modulus of elasticity of the selected material at temperature t °C
t.m
For lamellar graphite cast iron, unalloyed steel and grade 18.8 stainless steel, refer to the graph in Figure 1.
t (°C)
Key
A Unalloyed steel
B Type 18.8 stainless steel
C Grey cast iron
Figure 1 — Variation of modulus of elasticity (E) as a function of temperature
5 Horizontal shaft pumps
5.1 Definition of pump families and summary of features
Pump families are defined on the basis of the most commonly used
...