codes for vessels

7/28/2019 Codes for Vessels

1/15

WHAT ARE ASME CODES?

It is a standard that provides rules for the

design, fabrication, and inspection of boilers

and pressure.

This establishes and maintains design,

construction and inspection standards

providing for maximum protection of life and

property.


2/15

ASME Codes - Manufacturer

A manufacturer obtains permission to use one of thestamps through the ASME conformity assessment process.

The manufacturers quality control system is reviewed by

an ASME team.

If it meets ASME requirements and the manufacturersuccessfully demonstrates implementation of the program,the manufacturer is accredited by ASME.

The manufacturer then may certify the product as meetingASME standards and apply the stamp to the product.


3/15

Why follow ASME codes?

Excessive elastic deformation including elasticinstability

Excessive plastic deformation

Brittle fracture Stress rupture or creep deformation (inelastic)

Plastic instability and incremental collapse

High strain and low cycle fatigue

Stress corrosion

Corrosion fatigue


4/15

The organization of the ASME Boiler and Pressure Vessel Code is

as follows:

1. Section I: Power Boilers

2. Section II: Material Specification:

i. Ferrous Material Specifications Part A

ii. Non-ferrous Material Specifications Part B

iii. Specifications for Welding Rods, Electrodes, and Filler MetalsPart C

iv. Properties Part D

3. Section III Subsection NCA: General Requirements for Division 1

and Division 2i. Section III Division 1:

a. Subsection NA: General Requirements

b. Subsection NB: Class 1 Components


5/15

Subsection NC: Class 2 Components

d. Subsection ND: Class 3 Components

e. Subsection NE: Class MC Components

f. Subsection NF: Component Supports

g. Subsection NG: Core Support Structures

h. Appendices: Code Case N-47 Class 1:Components in Elevated Temperature Service

Section III, Division 2: Codes for Concrete Reactor

Vessel and Containment

Section IV: Rules for Construction of Heating Boilers

Section V: Nondestructive Examinations


6/15

Section VI: Recommended Rules for the Care and

Operation of

Heating Boilers Section VII: Recommended Guidelines for Care of Power

Boilers

Section VIII

i. Division 1: Pressure Vessels Rules forConstruction

ii. Division 2: Pressure Vessels Alternative Rules

Section IX: Welding and Brazing Qualifications Section X: Fiberglass-Reinforced Plastic Pressure Vessels

Section XI: Rules for In-Service Inspection of Nuclear

Power Plant Components


7/15

Stamps


8/15

Nomenclature


9/15


10/15

Example

A heat exchanger qualifies as a UM stamped

pressure vessel if:

- Design pressure < 15psig

- Internal volume < 1.5 cubic ft. for 150


11/15

Example

A heat exchanger qualifies as a U stamped

pressure vessel if:

- Design pressure > 600 psig

- Internal volume > 1.5 cubic ft. for 150


12/15

Comparison of pressure vessels

Item IS-2825 ASME CodeSection VIII

BS-5500 AD-Merkblatter

Scope Unfired fusion

welded pressure

vessels

Pressure < 20

N/mm2Do/Di < 1.5

Di > 150 mm

Water capacity >

50 litres

Welded, riveted,

forged and brazed

vessels

Water capacity>120

galOperating pressure >

15 psi

Di>6

Unfired fusion

welded pressure

vessels

Medium and

high pressurestorage vessels

Excludes

transportable

vessels.

Do/Di < 1.7

Vessels and

vessel parts

predominantly

under staticload.

materials Carbon and lowalloy steels, high

alloy steel, Cu and

Cu alloys, Al and

alloys, bolting and

casting alloys

Same as IS-2825Cast iron, lined

material cast iron,

ferritic steel

Carbon, ferriticalloy(low and

high) and

austenitic steels

All metallicmaterials and

graphite, glass.


13/15

Comparison of pressure vessels

Item IS-2825 ASME CodeSection VIII BS-5500 AD-MerkblatterDesign

pressure

Maximum working

pressure including

static head + 5%

maximum workingpressure.

Maximum

pressure at most

severe conditions

Maximum

pressure at

most severe

conditions

Based on

permissible

service pressure

Design

tempera

-ture

Highest metal

temperature

expected under

operating conditions

Actual metal

temperature

expected under

operating

conditions

Actual metal

temperature

expected

under

operatingconditions +

margin for

uncertainties

Highest wall

temperature

expected under

working

conditions


14/15

Comparion of pressure vessels

National code U.T.S Yield strength Sr(rupture

stress)

Creep stress

ASME: VIII

Div: 1

4 1.6 - 1

ASME: VIII

Div-2

3 1.5 - -

BS-1515 4 - - -

BS-1515

Part II

2.5 1.5 1.5 1

BS-5500 2.35 1.5 1.3 1

ANCC - 1.5 1.5 -

IS-2825 3 1.5 1.5 1


15/15

Safety in boiler and pressure vessels can be

achieved by:

Proper design and construction

Proper maintenance and inspection

Proper operator performance and vessel operation

codes for vessels

Documents