N-2546 REV. B ENGLISH 01 / 2011

PROPERTY OF PETROBRAS 4 pages, Index of Revisions and WG

Criteria for Use of Fire Tested Type Ball Valves

Procedure

This Standard replaces and cancels its previous revision.

The CONTEC - Authoring Subcommittee provides guidance on the interpretation of this Standard when questions arise regarding its contents. The Department of PETROBRAS that uses this Standard is responsible for adopting and applying the sections, subsections and enumerates thereof.

CONTEC Comissão de Normalização

Técnica

Technical Requirement: A provision established as the most adequate and which shall be used strictly in accordance with this Standard. If a decision is taken not to follow the requirement (“non-conformity” to this Standard) it shall be based on well-founded economic and management reasons, and be approved and registered by the Department of PETROBRAS that uses this Standard. It is characterized by imperative nature.

Recommended Practice: A provision that may be adopted under the conditions of this Standard, but which admits (and draws attention to) the possibility of there being a more adequate alternative (not written in this Standard) to the particular application. The alternative adopted shall be approved and registered by the Department of PETROBRAS that uses this Standard. It is characterized by verbs of a nonmandatory nature. It is indicated by the expression: [Recommended Practice].

SC - 16

Copies of the registered “non-conformities” to this Standard that may contribute to the improvement thereof shall be submitted to the CONTEC - Authoring Subcommittee.

Proposed revisions to this Standard shall be submitted to the CONTEC - Authoring Subcommittee, indicating the alphanumeric identification and revision of the Standard, the section, subsection and enumerate to be revised, the proposed text, and technical/economic justification for revision. The proposals are evaluated during the work for alteration of this Standard.

Industrial Safety

“The present Standard is the exclusive property of PETRÓLEO BRASILEIRO S.A. - PETROBRAS, for internal use in the Company, and any reproduction for external use or disclosure, without previous and express authorization from the owner, will imply an unlawful act pursuant to the relevant legislation through which the applicable responsibilities shall be imputed. External circulation shall be regulated by a specific clause of Secrecy and Confidentiality pursuant to the terms of intellectual and industrial property law.”

Introduction

PETROBRAS Technical Standards are prepared by Working Groups - WG

(consisting specialized of Technical Collaborators from Company and its Subsidiaries), are

commented by Company Units and its Subsidiaries, are approved by the Authoring Subcommittees -

SCs (consisting of technicians from the same specialty, representing the various Company Units and

its Subsidiaries), and ratified by the Executive Nucleus (consisting of representatives of the Company

Units and its Subsidiaries). A PETROBRAS Technical Standard is subject to revision at any time by its

Authoring Subcommittee and shall be reviewed every 5 years to be revalidated, revised or cancelled.

PETROBRAS Technical Standards are prepared in accordance with PETROBRAS Technical

Standard N-1. For complete information about PETROBRAS Technical Standards see PETROBRAS

Technical Standards Catalog. .

N-2546 REV. B ENGLISH 01 / 2011

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Foreword This Standard is the English version (issued in 01/2011) of PETROBRAS N-2546 REV. B 01/2011. In case of doubt, the Portuguese version, which is the valid document for all intents and purposes, shall be used. 1 Scope 1.1 This Standard establishes the criteria for the use of fire type tested ball valves at PETROBRAS. 1.2 This Standard is applied to onshore and offshore processing and production units as well as to pressurized Liquefied Petroleum Gas (LPG) storage tank areas. 1.3 This Standard is applied to designs started as of its date of issuance. In existing facilities, it will be up to the department that uses this Standard to decide on whether to apply it wholly or in part. 1.4 This Standard is not applied to:

a) ships; b) refrigerated LPG storage tank areas; c) underground facilities; d) oil and gas pipelines; e) systems only containing class 6, subclass 6.1 products (toxic substances) according to

ABNT NBR 7500 and which may be occasionally released due to a fire in their vicinity. 1.5 The application of this Standard in the case of companies of the PETROBRAS System headquartered abroad shall be based on respect for local legislation, as well as for the other applicable requirements. It shall be understood that all other existing Brazilian legislation or references pointed out in this Standard may serve as input to its adaptation process. 1.6 This Standard only contains Technical Requirements. 2 Normative References The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies..

PETROBRAS N-1645 - Safety Criteria to Project of Liquefied Petroleum Gas Storage Fixed Facilities; PETROBRAS N-1674 - Projeto de Arranjo de Instalações Industriais Terrestres de Petróleo, Derivados, Gás Natural e Álcool; ABNT NBR 7500 - Identificação para o Transporte Terrestre, Manuseio, Movimentação e Armazenamento de Produtos; ABNT NBR 15827 - Válvulas Industriais para Instalações de Exploração, Produção, Refino e Transporte de Produtos de Petróleo - Requisitos de Projeto e Ensaio de Protótipo; ISO 10497 - Testing of Valves - Fire Type-Testing Requirements.

NOTE For documents referred in this Standard and for which only the Portuguese version is

available, the PETROBRAS department that uses this Standard should be consulted for any information required for the specific application.

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3 Terms and Definitions For the purposes of this document, the following terms and definitions apply. 3.1 battery limits according to PETROBRAS N-1674 3.2 Blow Down Valves - BDV final element of the automatic control system operated by the emergency stop function which is depressurized given circuit and process equipment containing hydrocarbon pressure 3.3 XV valve (automatic valve) element with locking function of equipment or system, manual or remote, in normal operating conditions or emergency, or automatically actuated by an interlocking system 3.4 Shut Down Valves - SDV final element of the automatic control system operated by the emergency stop blocking the function of which is given circuit and process equipment containing hydrocarbon pressure 3.5 fire tested type ball valve valves specially designed and manufactured with characteristics of resistance test under fire (“fire tested type”), tested according to ISO 10497 4 General Conditions 4.1 The fire tested type ball valve with soft seat and metal secondary seal, as specified in ABNT NBR 15827, is considered an operational valve under normal operating conditions, behaving as a fire tested type ball valve only when (during and after) a fire occurs. 4.2 The use of fire tested type ball valve with metal-to-metal seal, where possible, shall be avoided. 5 Criteria For Use 5.1 Pressurized LPG Storage Tank Area Shall be adhered to criteria established by PETROBRAS N-1645. 5.2 Offshore Production Unit 5.2.1 The BDV shall be of the fire tested type ball valve. 5.2.2 The valves XV and SDV and their respective bypasses to equalize the pressure shall be of the fire tested type ball valve.

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5.3 Onshore Processing Unit 5.3.1 The fire tested type ball valves shall be installed in vessels that process/store pressurized liquefied flammable gases. 5.3.2 In the vessels referred to in 5.3.1 shall be fire tested type ball valves the first block valve from the shell in piping or accessories connected to the vessel at a level below the maximum level expected from the liquid phase of the pressurized liquefied flammable gas. 5.3.3 In certain situations such as, for instance, a low inventory of the liquefied fraction contained in the vessel and then there is reduced risk to neighboring facilities, the use of fire tested type ball valves may be dispensed with previously conducting risk assessment studies. 5.3.4 Block valves located within the battery limits in piping systems transferring pressurized liquefied flammable gases shall be fire tested type ball valves.

N-2546 REV. B ENGLISH 01 / 2011

IR 1/1

INDEX OF REVISIONS

REV. A

There is no index of revisions.

REV. B

Affected Parts Description of Alteration

All Revision

N-2546 REV. B ENGLISH 01 / 2011

WORKING GROUP - WG-16-76

Members

Name Department Telephone Key

Ernesto Mendes Ferreira SMES/GGSMS/SG 819-1277 EU47

Fernando C. dos Santos Junior E&P-ENGP/IPP/EISA 704-8799 K074

Homero de Carvalho Aboud ENGENHARIA/IEABAST/EAB/ENPRO 819-3396 SGR9

Pedro Fernando Andre REVAP/SMS/SI 855-6189 PFDE

Technical Secretary

Alexander Neri dos Santos ENGENHARIA/AG/NORTEC-GC 819-3086 EEDS