ДСТУ EN 12953-3:2017 Котли жаротрубні. Частина 3. Проектування та розрахування для складників, які перебувають під тиском (EN 12953-3:2016, IDT)

ПІДТВЕРДЖУВАЛЬНЕ ПОВІДОМЛЕННЯ

Державне підприємство
«Український науково-дослідний і навчальний центр
проблем стандартизації, сертифікації та якості»
(   
(ДП «УкрНДНЦ»))

Наказ від 27.12.2017 № 473

EN 12953-3:2016

Shell boilers — Part 3: Design and calculation for pressure parts

прийнято як національний стандарт
методом «підтвердження» за позначенням
 

ДСТУ EN 12953-3:2017
(EN 12953-3:2016, IDT)

Котли жаротрубні. Частина 3. Проектування та розрахування
для складників, які перебувають під тиском

З наданням чинності від 2018-02-01

Contents

European foreword

1 Scope

2 Normative references

3 Terms and definitions

4 Symbols and abbreviations

5 General

5.1 Boilers

5.2 Hot-water boilers

5.3 Main welds

5.4 Weld factor

5.5 Thermal design of furnaces tubes

5.5.1 Design conditions

5.5.2 Furnace dimensions

5.5.3 Heat input

5.5.4 Additional operating conditions

5.6 Dimensions of pressure parts

5.7 Determination of pressures

5.7.1 Maximum allowable pressure

5.7.2 Calculation pressure

5.7.3 Safety valves set pressure

5.7.4 Hydrostatic test pressure

5.8 Allowances

5.8.1 Allowance for material supply tolerances and forming processes

5.8.2 Allowance for metal wastage

5.9 Additional material requirements for plates

5.10 Standardized fittings

5.11 Flanges

5.12 Design by analysis

5.13 Economizer and superheater

6 Calculation temperature and nominal design stress

6.1 Calculation temperature

6.2 Nominal design stress

7 Cylindrical shells

7.1 Shell thickness

7.1.1 Requirements

7.1.2 Required wall thickness including allowances

7.2 Basic calculation subjected to internal pressure

7.3 Boiler supports and lifting lugs

8 Openings and branches in cylindrical shells

8.1 General

8.1.1 Introduction

8.1.2 Requirements for the reinforcement of openings in shells

8.1.3 Effective lengths l rs for calculation of efficiencies and of compensations

8.1.4 Condition of isolated openings

8.1.5 Requirements for design of branches

8.1.6 Requirements for design of reinforcing pads

8.1.7 General requirements for calculation of cross-sectional and pressure-loaded areas

8.2 Efficiency factor, alternative calculation method, maximum diameter of an un-reinforced opening

8.2.1 General

8.2.2 Allowable efficiency and maximum diameter of an unreinforced opening

8.2.3 Isolated openings

8.2.4 Adjacent openings

8.3 Design of openings and branches in shells (efficiency and reinforcement)

8.3.1 Symbols and abbreviations

8.3.2 Requirements for application

8.3.3 Design of isolated openings and branch connections

8.3.4 Design of adjacent openings and branch connections

9 Ends

9.1 Unstayed dished heads without openings

9.1.1 Unstayed dished heads under internal pressure

9.1.2 Limiting conditions

9.1.3 Unstayed dished heads under external pressure

9.2 Flat unstayed removable closures

9.3 Unstayed flat plates

10 Supported flat plates, stays and stiffeners

10.1 Breathing space for flat plates

10.2 Stayed flat surfaces

10.2.1 General

10.2.2 Radius of flange

10.2.3 Point of support

10.2.4 Thickness

10.2.5 Values of constant C 4

10.2.6 Stays for wet back reversal chambers

10.2.7 Stay tubes and bars

10.2.8 Loads on stay tubes and bar stays

10.2.9 Gusset stays

10.2.10 Weld attachments

10.2.11 Additional requirements for set-in end plates

10.2.12 Girder stays supporting the flat section of a reversal chamber

11 Design of isolated openings in boiler flat end plates

11.1 Unreinforced isolated openings

11.2 Branch openings

11.3 Manholes, headholes and handholes

12 Unpierced tubes and tube plates

12.1 Thickness of straight tubes subject to external pressure

12.2 Thickness of straight tubes subject to internal pressure

12.3 Wall thickness and ovality of elbows and tube bends

12.3.1 General

12.3.2 Departure from circularity of the tube bends

12.4 Smoke tubes

12.5 Pitch of tubes

12.6 Thickness of the tube plates within tube nests

13 Furnaces tubes, furnace components and reversal chambers of cylindrical form subject to external pressure

13.1 Furnaces tubes

13.1.1 Plain furnaces tubes

13.1.2 Corrugated furnaces tubes

13.1.3 Safety factors

13.1.4 Furnace components

13.1.5 Reversal chambers

13.2 Calculation length of composite furnaces tubes

13.3 Tolerances of furnaces tubes

13.4 Stiffeners

13.4.1 General

13.4.2 Stiffener sections made from bar or plate

13.4.3 Stiffeners located within the zone of peak heat flux

13.4.4 Bowling hoops

14 Access and inspection openings

14.1 General requirements

14.2 Types and minimum dimensions of access and inspection openings

14.3 Minimum gasket bearing width and clearance for access and inspection doors

14.4 Access and inspection openings in flat plates

14.5 Requirements for entry area into boilers with a shell outside diameter greater than 1400 mm

14.6 Accessibility and arrangement of entry and inspection openings

Annex A (informative) Calculation form for “Walker”-type reverse curve sections or corrugations

Annex B (normative) Furnace calculation temperature

B.1 Calculation of the maximum and the middle furnace wall temperature

Annex C (informative) Calculation of tube plate temperatures

C.1 General

C.2 Symbols

C.3 Calculation method

C.3.1 Radiation coefficients

C.3.2 Convection coefficients

C.3.3 Weighted average gas-side heat transfer coefficient

C.3.4 Tube plate thermal conductance

C.3.5 Water side heat transfer

C.3.6 Tube plate temperatures

C.4 Example of a calculation carried out using the method given in C.3

C.4.1 Design data assumed

C.4.2 Calculation of radiation coefficient

C.4.3 Calculation of convection coefficients

C.4.4 Calculation of weighted average gas-side heat transfer coefficient

C.4.5 Calculation of tube plate thermal conductance

C.4.6 Calculation of tube plate temperatures

Annex D (normative) Economizer and superheater with water tube design connected to the shell boiler

D.1 General

D.2 Design of economizer and superheater connected to shell boilers

Annex E (informative) Significant technical changes between this European Standard and the previous edition

Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Directive 2014/68/EU aimed to be covered

Bibliography