NEN EN 12952-3 : 2012
Current
The latest, up-to-date edition.
WATER-TUBE BOILERS AND AUXILIARY INSTALLATIONS - PART 3: DESIGN AND CALCULATION FOR PRESSURE PARTS OF THE BOILER
12-01-2013
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviations
5 General
5.1 Purpose
5.2 Dimensions of pressure parts
5.3 Strength of pressure parts
5.4 Design by analysis
5.5 Cyclic loading
5.6 General design requirements
5.7 Design and calculation pressures
5.8 Metal wastage
5.9 Attachments on pressure parts
6 Calculation temperature and nominal design stress
6.1 Calculation temperature
6.2 Maximum through-the-wall temperature difference
and maximum flue gas temperature for heated drums
and headers
6.3 Design stress
7 Cylindrical shells of drums and headers under internal
pressure
7.1 Shell thickness
7.2 Basic calculation
7.3 Combined stresses in drum and header shells
7.4 Boiler drum supports
7.5 Other stresses in cylindrical shells
8 Openings and branches in cylindrical shells of drums
and headers and integral tubes
8.1 General
8.2 Efficiency factor, calculation by way of approximation,
and maximum diameter of unreinforced openings
8.3 Design of openings and branches in cylindrical
shells (efficiency and reinforcement)
8.4 Bolted connections
8.5 Screwed connections
9 Headers and plain tubes of rectangular section
9.1 General
9.2 Symbols and abbreviations
9.3 Required wall thickness
10 Ends and spherical shells
10.1 Symbols and abbreviations
10.2 Spherical shells and dished ends
10.3 Unstayed flat ends
10.4 Flat unstayed closures
11 Tubes
11.1 Symbols and abbreviations
11.2 Thickness of straight boiler tubes
11.3 Thickness of tube bends and elbows
11.4 Flexibility of integral tubing tube systems
11.5 Structural attachments to tubes
11.6 Fitting and joining of heated tubes
11.7 Joining of unheated tubes
12 Pressure parts of irregular shape
12.1 Hydrostatic test for determining the allowable
internal pressure
12.2 Numerical methods
13 Fatigue
13.1 General
13.2 Symbols and abbreviations
13.3 Exemption rule for fatigue analysis
13.4 Stress analysis for fatigue calculation
13.5 Example calculations
Annex A (normative) Calculation of tube bends and elbows
A.1 General
A.2 Symbols and abbreviations
A.3 Required wall thickness
A.4 Calculation
Annex B (normative) Fatigue cracking - Design to allow
for fluctuating stress
B.1 General
B.2 Conditions
B.3 Symbols and abbreviations
B.4 Cyclic stress range and mean cyclic stress in the
case of uniaxial and multiaxial fluctuating stress
B.5 Correction factors for taking into account the
influences of surface finish and weldments
B.6 Controlling stress range
B.7 Permissible stress range with a known number of load
cycles
Annex C (informative) Examples of calculating the effects of
fatigue
C.1 General
C.2 Calculation of the admissible of load cycles
C.3 Calculation of the admissible temperature gradient
Annex D (informative) Physical properties of steel
D.1 General
D.2 Symbols and abbreviations
D.3 Physical properties .
D.4 Physical properties of steels
Annex ZA (informative) Clauses of this European Standard
addressing essential requirements or other provisions
of the Pressure Equipment Directive
Bibliography
Defines the requirements for the design and calculation of water-tube boilers as defined in EN 12952-1.
DocumentType |
Standard
|
PublisherName |
Netherlands Standards
|
Status |
Current
|
Standards | Relationship |
NF EN 12952-3 : 2012 | Identical |
ONORM EN 12952-3 : 2012 | Identical |
I.S. EN 12952-3:2011 | Identical |
EN 12952-3:2011 | Identical |
UNE-EN 12952-3:2012 | Identical |
UNI EN 12952-3 : 2012 | Identical |
DIN EN 12952-3:2012-03 | Identical |
BS EN 12952-3:2011 | Identical |
Access your standards online with a subscription
Features
-
Simple online access to standards, technical information and regulations.
-
Critical updates of standards and customisable alerts and notifications.
-
Multi-user online standards collection: secure, flexible and cost effective.