SIST EN 12953-3:2016
(Main)Shell boilers - Part 3: Design and calculation for pressure parts
Shell boilers - Part 3: Design and calculation for pressure parts
This Part of this European Standard specifies requirements for the design and calculation of pressure parts of shell boilers as defined in EN 12953 1.
NOTE For other components such as economisers, superheaters, tube walls, headers, reference should be made to EN 12952 series.
Großwasserraumkessel - Teil 3: Konstruktion und Berechnung für drucktragende Teile
Dieser Teil der Europäischen Norm legt Anforderungen an die Konstruktion und die Berechnung von druck¬tragenden Teilen für die in EN 12953 1 definierten Großwasserraumkessel fest.
Für andere Komponenten, wie z. B. Wasserrohrwände, sollte die Normenreihe EN 12952 in Bezug genommen werden.
Chaudières à tube de fumée - Partie 3: Conception et calcul des parties sous pression
La présente partie de la Norme européenne spécifie les exigences de conception et de calcul des parties sous pression des chaudières à tubes de fumée telles que définies dans l’EN 12953 1.
Pour les autres composants, tels que les parois à tubes d'eau, il convient de se référer à la série EN 12952.
Mnogovodni kotli - 3. del: Konstruiranje in izračun tlačno obremenjenih delov
Ta del tega evropskega standarda določa zahteve za konstruiranje in izračun tlačno obremenjenih delov mnogovodnih kotlov iz standarda EN 12953 1.
OPOMBA: Za druge sestavne dele, kot so ekonomizerji, grelci, cevne stene, kompenzacijski rezervoarji, glej skupino standardov EN 12952.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 12953-3:2016
01-junij-2016
1DGRPHãþD
SIST EN 12953-3:2002
0QRJRYRGQLNRWOLGHO .RQVWUXLUDQMHLQL]UDþXQWODþQRREUHPHQMHQLKGHORY
Shell boilers - Part 3: Design and calculation for pressure parts
Großwasserraumkessel - Teil 3: Konstruktion und Berechnung für drucktragende Teile
Chaudières à tube de fumée - Partie 3: Conception et calcul des parties sous pression
Ta slovenski standard je istoveten z: EN 12953-3:2016
ICS:
27.060.30 Grelniki vode in prenosniki Boilers and heat exchangers
toplote
SIST EN 12953-3:2016 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 12953-3:2016
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SIST EN 12953-3:2016
EN 12953-3
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2016
EUROPÄISCHE NORM
ICS 27.060.30; 27.100 Supersedes EN 12953-3:2002
English Version
Shell boilers - Part 3: Design and calculation for pressure
parts
Chaudières à tubes de fumée - Partie 3: Conception et Großwasserraumkessel - Teil 3: Konstruktion und
calcul des parties sous pression Berechnung für drucktragende Teile
This European Standard was approved by CEN on 23 January 2016.
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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12953-3:2016 E
worldwide for CEN national Members.
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SIST EN 12953-3:2016
EN 12953-3:2016 (E)
Contents Page
European foreword . 5
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Symbols and abbreviations . 8
5 General . 8
5.1 Boilers . 8
5.2 Hot-water boilers . 8
5.3 Main welds . 8
5.4 Weld factor . 9
5.5 Thermal design of furnaces tubes . 9
5.5.1 Design conditions . 9
5.5.2 Furnace dimensions . 11
5.5.3 Heat input . 11
5.5.4 Additional operating conditions . 12
5.6 Dimensions of pressure parts . 12
5.7 Determination of pressures . 12
5.7.1 Maximum allowable pressure . 12
5.7.2 Calculation pressure . 12
5.7.3 Safety valves set pressure . 12
5.7.4 Hydrostatic test pressure . 13
5.8 Allowances . 13
5.8.1 Allowance for material supply tolerances and forming processes . 13
5.8.2 Allowance for metal wastage . 13
5.9 Additional material requirements for plates . 13
5.10 Standardized fittings . 14
5.11 Flanges . 14
5.12 Design by analysis . 14
5.13 Economizer and superheater. 14
6 Calculation temperature and nominal design stress . 14
6.1 Calculation temperature . 14
6.2 Nominal design stress. 15
7 Cylindrical shells . 15
7.1 Shell thickness . 15
7.1.1 Requirements . 15
7.1.2 Required wall thickness including allowances . 16
7.2 Basic calculation subjected to internal pressure . 16
7.3 Boiler supports and lifting lugs . 16
8 Openings and branches in cylindrical shells . 16
8.1 General . 16
8.1.1 Introduction . 16
8.1.2 Requirements for the reinforcement of openings in shells . 16
8.1.3 Effective lengths l for calculation of efficiencies and of compensations. 18
rs
8.1.4 Condition of isolated openings . 22
8.1.5 Requirements for design of branches . 22
8.1.6 Requirements for design of reinforcing pads . 22
8.1.7 General requirements for calculation of cross-sectional and pressure-loaded areas . 23
8.2 Efficiency factor, alternative calculation method, maximum diameter of an un-reinforced
opening . 23
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SIST EN 12953-3:2016
EN 12953-3:2016 (E)
8.2.1 General . 23
8.2.2 Allowable efficiency and maximum diameter of an unreinforced opening . 24
8.2.3 Isolated openings . 24
8.2.4 Adjacent openings . 25
8.3 Design of openings and branches in shells (efficiency and reinforcement) . 25
8.3.1 Symbols and abbreviations . 25
8.3.2 Requirements for application . 26
8.3.3 Design of isolated openings and branch connections . 30
8.3.4 Design of adjacent openings and branch connections . 32
9 Ends . 33
9.1 Unstayed dished heads without openings . 33
9.1.1 Unstayed dished heads under internal pressure . 33
9.1.2 Limiting conditions . 33
9.1.3 Unstayed dished heads under external pressure . 35
9.2 Flat unstayed removable closures . 36
9.3 Unstayed flat plates. 37
10 Supported flat plates, stays and stiffeners . 38
10.1 Breathing space for flat plates . 38
10.2 Stayed flat surfaces . 40
10.2.1 General . 40
10.2.2 Radius of flange . 40
10.2.3 Point of support . 40
10.2.4 Thickness . 41
10.2.5 Values of constant C . 44
4
10.2.6 Stays for wet back reversal chambers . 54
10.2.7 Stay tubes and bars . 56
10.2.8 Loads on stay tubes and bar stays . 56
10.2.9 Gusset stays. 56
10.2.10 Weld attachments . 58
10.2.11 Additional requirements for set-in end plates . 58
10.2.12 Girder stays supporting the flat section of a reversal chamber . 60
11 Design of isolated openings in boiler flat end plates . 60
11.1 Unreinforced isolated openings . 60
11.2 Branch openings . 60
11.3 Manholes, headholes and handholes . 62
12 Unpierced tubes and tube plates . 63
12.1 Thickness of straight tubes subject to external pressure . 63
12.2 Thickness of straight tubes subject to internal pressure. 64
12.3 Wall thickness and ovality of elbows and tube bends . 64
12.3.1 General . 64
12.3.2 Departure from circularity of the tube bends . 64
12.4 Smoke tubes. 66
12.5 Pitch of tubes . 70
12.6 Thickness of the tube plates within tube nests . 70
13 Furnaces tubes, furnace components and reversal chambers of cylindrical form subject
to external pressure . 71
13.1 Furnaces tubes . 71
13.1.1 Plain furnaces tubes . 71
13.1.2 Corrugated furnaces tubes . 71
13.1.3 Safety factors . 72
13.1.4 Furnace components . 72
13.1.5 Reversal chambers . 72
13.2 Calculation length of composite furnaces tubes . 73
13.3 Tolerances of furnaces tubes. 74
13.4 Stiffeners . 74
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SIST EN 12953-3:2016
EN 12953-3:2016 (E)
13.4.1 General . 74
13.4.2 Stiffener sections made from bar or plate . 75
13.4.3 Stiffeners located within the zone of peak heat flux . 75
13.4.4 Bowling hoops . 75
14 Access and inspection openings . 78
14.1 General requirements . 78
14.2 Types and minimum dimensions of access and inspection openings . 79
14.3 Minimum gasket bearing width and clearance for access and inspection doors . 81
14.4 Access and inspection openings in flat plates . 81
14.5 Requirements for entry area into boilers with a shell outside diameter greater than
1 400 mm . 81
14.6 Accessibility and arrangement of entry and inspection openings . 81
Annex A (informative) Calculation form for “Walker”-type reverse curve sections or
corrugations . 82
Annex B (normative) Furnace calculation temperature . 84
B.1 Calculation of the maximum and the middle furnace wall temperature . 84
Annex C (informative) Calculation of tube plate temperatures . 87
C.1 General . 87
C.2 Symbols . 87
C.3 Calculation method . 88
C.3.1 Radiation coefficients . 88
C.3.2 Convection coefficients . 92
C.3.3 Weighted average gas-side heat transfer coefficient . 95
C.3.4 Tube plate thermal conductance . 97
C.3.5 Water side heat transfer . 98
C.3.6 Tube plate temperatures . 98
C.4 Example of a calculation carried out using the method given in C.3 . 101
C.4.1 Design data assumed . 101
C.4.2 Calculation of radiation coefficient . 102
C.4.3 Calculation of convection coefficients . 102
C.4.4 Calculation of weighted average gas-side heat transfer coefficient . 102
C.4.5 Calculation of tube plate thermal conductance . 102
C.4.6 Calculation of tube plate temperatures . 103
Annex D (normative) Economizer and superheater with water tube design connected to the
shell boiler . 104
D.1 General . 104
D.2 Design of economizer and superheater connected to shell boilers . 104
Annex E (informative) Significant technical changes between this European Standard and the
previous edition . 106
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 2014/68/EU aimed to be covered . 107
Bibliography . 108
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SIST EN 12953-3:2016
EN 12953-3:2016 (E)
European foreword
This document (EN 12953-3:2016) has been prepared by Technical Committee CEN/TC 269 “Shell and wa-
ter-tube boilers”, the secretariat of which is held by DIN.
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 November 2016, and conflicting national standards shall be with-
drawn at the latest by November 2016.
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 12953-3:2002.
This document has been prepared under a mandate given to CEN by the European Commission and the Eu-
ropean Free Trade Association, and supports essential requirements of EU Directive(s).
For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document.
The informative Annex E lists the significant technical changes between this European Standard and the pre-
vious edition.
EN 12953, Shell boilers, consists of the following parts:
— Part 1: General
— Part 2: Materials for pressure parts of boilers and accessories
— Part 3: Design and calculation for pressure parts
— Part 4: Workmanship and construction of pressure parts of the boiler
— Part 5: Inspection during construction, documentation and marking of pressure parts of the boiler
— Part 6: Requirements for equipment for the boiler
— Part 7: Requirements for firing systems for liquid and gaseous fuels for the boilers
— Part 8: Requirements for safeguards against excessive pressure
— Part 9: Requirements for limiting devices of the boiler and accessories
— Part 10: Requirements for feedwater and boiler water quality
— Part 11: Acceptance tests
— Part 12: Requirements for grate firing systems for solid fuels for the boiler
— Part 13: Operating instructions
— (CR 12953) Part 14: Guideline for involvement of an inspection body independent of the manufacturer
Although these parts can be obtained separately, it should be recognized that the parts are interdependent.
As such, the design and manufacture of shell boilers requires the application of more than one part in order
for the requirements of the standard to be satisfactorily fulfilled.
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SIST EN 12953-3:2016
EN 12953-3:2016 (E)
NOTE A “Boiler Helpdesk” has been established in CEN/TC 269 which may be contacted for any questions regard-
ing the application of the European Standards series EN 12952 and EN 12953, see the following website:
http://www.boiler-helpdesk.din.de
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, Former Yugoslav Republic of Macedonia, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portu-
gal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
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SIST EN 12953-3:2016
EN 12953-3:2016 (E)
1 Scope
This Part of this European Standard specifies requirements for the design and calculation of pressure parts
of shell boilers as defined in EN 12953-1.
For other components such as water tube walls reference should be made to EN 12952 series.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indis-
pensable for its application. For dated references, only the edition cited applies. For undated
...
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