EN 15776:2011/FprA1

Unfired pressure vessels - Requirements for the design and fabrication of pressure vessels and pressure parts constructed from cast iron with an elongation after fracture equal or less than 15 %

Update normative refere nces and incorporate comments from CEN consultant

Unbefeuerte Druckbehälter - Anforderungen an die Konstruktion und Herstellung von Druckbehältern und Druckbehälterteilen aus Gusseisen mit einer Bruchdehnung von 15 % oder weniger

Récipients sous pression non soumis à la flamme - Exigences supplémentaires pour la conception et la fabrication des récipients sous pression et des parties sous pression moulés en fonte à allongement, après rupture, inférieur ou égal à 15 %

Neogrevane (nekurjene) tlačne posode - Zahteve za konstruiranje in izdelavo tlačnih posod in njihovih delov iz litega železa z raztezkom ob porušitvi, enakim ali manjšim kot 15 %

General Information

• Status: Not Published
• ICS: 23.020.30 - Pressure vessels, gas cylinders
• Technical Committee: CEN/TC 54 - Unfired pressure vessels
• Drafting Committee: CEN/TC 54/WG 58 - G - Nodular cast iron vessels
• Current Stage: 5060 - Closure of Vote - Formal Approval
• Start Date: 23-Jul-2015
• Completion Date: 23-Jul-2015
• Directive: 97/23/EC - Directive 97/23/EC of the European Parliament and of the Council of 29 May 1997 on the approximation of the laws of the Member States concerning pressure equipment
• Mandate: M/071 - Mandate to CEN for standardization in the field of Pressure equipment
• Ref Project: SIST EN 15776:2011/kFprA1:2015 - Unfired pressure vessels - Requirements for the design and fabrication of pressure vessels and pressure parts constructed from cast iron with an elongation after fracture equal or less than 15 %

Relations

• Merged Into: EN 15776:2011+A1:2015 - Unfired pressure vessels - Requirements for the design and fabrication of pressure vessels and pressure parts constructed from cast iron with an elongation after fracture equal or less than 15 %
• Effective Date: 05-Aug-2015
• Amends: EN 15776:2011 - Unfired pressure vessels - Requirements for the design and fabrication of pressure vessels and pressure parts constructed from cast iron with an elongation after fracture equal or less than 15 %
• Effective Date: 19-Mar-2014

Overview

EN 15776:2011/FprA1 is a pivotal European standard published by CEN that specifies the requirements for the design and fabrication of unfired pressure vessels and pressure parts constructed from cast iron. This amendment focuses on vessels made from cast iron grades exhibiting an elongation after fracture of 15% or less, addressing critical safety and quality aspects necessary for industrial pressure equipment. The standard integrates updated normative references and feedback from industry consultants, ensuring alignment with the latest materials, testing methods, and manufacturing practices.

Key features of this standard include reinforced guidelines on material selection, pressure and temperature limits, testing protocols, and design calculations tailored for cast iron pressure vessels. It supports compliance with the essential requirements of the EU Pressure Equipment Directive 97/23/EC, underlining its regulatory and practical importance across European markets.

Key Topics

• Scope and Application
  EN 15776:2011/FprA1 applies specifically to unfired pressure vessels and parts made from cast iron grades including grey cast iron, spheroidal graphite iron (ductile cast iron), and austenitic cast iron with an elongation limit ≤15%. It may be used independently but notes compatibility with broader standards like EN 13445-6 for higher ductility cast irons.

• Materials and Design Limits
  Materials covered must comply with established cast iron standards such as EN 1561, EN 1563, and EN 13835. Design limits include restrictions on maximum allowable design temperatures (ranging typically from -10 °C to 200 °C with some exceptions up to 300 °C) and pressures, as well as energy content limits expressed as PS × V for single castings. The amendment updates these parameters to reflect the latest research and operational experience.

• Mechanical Properties and Testing
  Emphasis is placed on ensuring material strength and integrity via tensile strength assessments, with updated values for design calculations of lamellar graphite cast irons. Non-destructive testing methods such as liquid penetrant testing per EN 1371-1:2011 procedures are mandated to detect surface defects with requirements for severity and acceptance criteria specified.

• Terminology and Symbols
  The standard clarifies terms related to different cast iron types, including grey, nodular (spheroidal graphite), and austenitic cast irons, alongside their typical chemical compositions and microstructures. Symbol definitions align with related standards like EN 13445-6:2014 for unified technical communication.

• Compliance and Traceability
  This document ensures traceability of materials and manufacturing processes fulfilling the EU's regulatory framework. It mandates documentation and marking standards to facilitate quality assurance and auditing.

Applications

EN 15776:2011/FprA1 is critical in industries where pressure vessels made from cast iron are employed but do not involve direct firing or ignition sources. Typical sectors benefiting from this standard include:

• Chemical Processing Plants
  Equipment used for storage and containment under pressure without heating.

• Water and Waste Treatment Facilities
  Cast iron vessels designed to withstand internal pressures safely with cost-effective materials.

• Manufacturing Industries
  Fabrication of dryer rollers, paper cylinders, and specialized vessels conforming to stringent mechanical property requirements.

• Engineering and Fabrication Companies
  Standards-driven design and assembly of pressure parts ensuring predictable mechanical performance.

By adhering to EN 15776:2011/FprA1, manufacturers and end-users optimize safety, durability, and regulatory compliance, enhancing operational reliability and minimizing risks related to material failure.

Related Standards

EN 15776:2011/FprA1 complements and references several key European and international standards essential for the comprehensive regulation of pressure equipment:

• EN 1561:2011 - Grey Cast Iron Specifications
• EN 1563:2011 - Spheroidal Graphite Cast Iron Specifications
• EN 13835:2012 - Austenitic Cast Iron Specifications
• EN 13445-6:2014 - Unfired Pressure Vessels, Material Aspects for Cast Iron
• EN 1371-1:2011 - Liquid Penetrant Testing for Castings
• EN 764-5:2014 - Inspection Documentation and Compliance for Metallic Materials
• Pressure Equipment Directive 97/23/EC - EU Regulatory Framework for Pressure Equipment

These related standards provide complementary technical and procedural guidance, ensuring that cast iron pressure vessel design and fabrication meet the highest levels of safety and quality.

---

Adopting EN 15776:2011/FprA1 ensures that pressure vessels made from cast iron with limited elongation are designed, tested, and fabricated consistently to modern engineering requirements. This enhances safety, operational efficiency, and regulatory compliance across Europe’s pressure equipment sector.

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2015
1HRJUHYDQHWODþQHSRVRGH=DKWHYH]DNRQVWUXLUDQMHLQL]GHODYRWODþQLKSRVRGLQ
QMLKRYLKGHORYL]OLWHJDåHOH]D]UD]WH]NRPRESRUXãLWYLHQDNLPDOLPDQMãLPNRW

Unfired pressure vessels - Requirements for the design and fabrication of pressure
vessels and pressure parts constructed from cast iron with an elongation after fracture
equal or less than 15 %
Unbefeuerte Druckbehälter - Anforderungen an die Konstruktion und Herstellung von
Druckbehältern und Druckbehälterteilen aus Gusseisen mit einer Bruchdehnung von 15
% oder weniger
Récipients sous pression non soumis à la flamme - Exigences supplémentaires pour la
conception et la fabrication des récipients sous pression et des parties sous pression
moulés en fonte à allongement, après rupture, inférieur ou égal à 15 %
Ta slovenski standard je istoveten z: EN 15776:2011/FprA1
ICS:
23.020.30 7ODþQHSRVRGHSOLQVNH Pressure vessels, gas
MHNOHQNH cylinders
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
FINAL DRAFT
EN 15776:2011
NORME EUROPÉENNE
EUROPÄISCHE NORM
FprA1
April 2015
ICS 23.020.30
English Version
Unfired pressure vessels - Requirements for the design and
fabrication of pressure vessels and pressure parts constructed
from cast iron with an elongation after fracture equal or less than
15 %
Récipients sous pression non soumis à la flamme - Unbefeuerte Druckbehälter - Anforderungen an die
Exigences supplémentaires pour la conception et la Konstruktion und Herstellung von Druckbehältern und
fabrication des récipients sous pression et des parties sous Druckbehälterteilen aus Gusseisen mit einer Bruchdehnung
pression moulés en fonte à allongement, après rupture, von 15 % oder weniger
inférieur ou égal à 15 %
This draft amendment is submitted to CEN members for unique acceptance procedure. It has been drawn up by the Technical Committee
CEN/TC 54.
This draft amendment A1, if approved, will modify the European Standard EN 15776:2011. If this draft becomes an amendment, CEN
members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for inclusion of this amendment
into the relevant national standard without any alteration.

This draft amendment was established by CEN 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.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 15776:2011/FprA1:2015 E
worldwide for CEN national Members.

Content page
Foreword . 3
1 Modifications to the whole text . 4
2 Modification to the Introduction . 4
3 Modifications to Clause 2, Normative references . 4
4 Modifications to 3.1, Terms and definitions . 5
5 Modifications to 3.2, Symbols . 5
6 Modification to 3.3, Inter relation of thicknesses definitions (EN 13445-6) . 5
7 Modification to 4.1, Materials and limitations on temperature, maximum allowable
pressure energy content . 5
8 Modification to 4.2, Cyclic loading . 7
9 Modification to 5.8.2.5, R* Determination and general test requirements . 7
m
10 Modification to 6.3.5, Penetrant testing . 7
11 Modification to Annex A . 8
12 Modification to Annex ZA . 8
13 Modifications to the Bibliography . 9

Foreword
This document (EN 15776:2011/FprA1:2015) has been prepared by Technical Committee CEN/TC 54
“Unfired pressure vessels”, the secretariat of which is held by BSI.
This document is currently submitted to the Unique Acceptance Procedure.
This document has been prepared under a mandate given to CEN by the European Commission and the
European 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.
1 Modifications to the whole text
Replace
"EN 764-5:2002" with "EN 764-5:2014";
"EN 13445-3:2009" and "EN 13445-3" with "EN 13445-3:2014";
"EN 13445-5:2009" and "EN 13445-5" with "EN 13445-5:2014";
"EN 13445-6:2009" and "EN 13445-6" with "EN 13445-6:2014";
"EN 1561" with "EN 1561:2011";
"EN 1563" with "EN 1563:2011" and
"EN 13835" with "EN 13835:2012".
2 Modification to the Introduction
st
Replace the 1 paragraph with the following:
"This standard is a stand-alone document and may be used for pressure equipment with certain restrictions
and limitations.
NOTE For the design and fabrication of cast iron pressure equipment standards with higher elongations and ductility,
see EN 13445-6:2014.".
3 Modifications to Clause 2, Normative references
Replace
"EN 764-5:2002, Pressure Equipment — Part 5: Compliance and Inspection Documentation of Materials"
with
"EN 764-5:2014, Pressure equipment — Part 5: Inspection documentation of metallic materials and
compliance with the material specification".
Replace "EN 1370" with "EN 1370:2011".
Replace
"EN 1371-1:1997, Founding — Liquid penetrant inspection — Part 1: Sand, gravity die and low pressure die
castings"
with
"EN 1371-1:2011, Founding — Liquid penetrant inspection — Part 1: Sand, gravity die and low pressure die
castings".
Replace "EN 1559-1" with "EN 1559-1:2011" and "EN 1559-3" with "EN 1559-3:2011".
Replace "EN 12680-3" with "EN 12680-3:2012".
Replace 'EN ISO 8062-3" with "EN ISO 8062-3:2007".
4 Modifications to 3.1, Terms and definitions
In 3.1.1, replace "NOTE" with "Note 1 to entry:" and add the following no
...