DNV OS-A101

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Transcript of DNV OS-A101

OFFSHORE STANDARD DNV-OS-A101

SAFETY PRINCIPLES AND ARRANGEMENTSOCTOBER 2008

This booklet has since the main revision (October 2008) been amended, most recently in October 2009. See the reference to Amendments and Corrections on the next page.

DET NORSKE VERITAS

FOREWORDDET NORSKE VERITAS (DNV) is an autonomous and independent foundation with the objectives of safeguarding life, property and the environment, at sea and onshore. DNV undertakes classification, certification, and other verification and consultancy services relating to quality of ships, offshore units and installations, and onshore industries worldwide, and carries out research in relation to these functions. DNV Offshore Codes consist of a three level hierarchy of documents: Offshore Service Specifications. Provide principles and procedures of DNV classification, certification, verification and consultancy services. Offshore Standards. Provide technical provisions and acceptance criteria for general use by the offshore industry as well as the technical basis for DNV offshore services. Recommended Practices. Provide proven technology and sound engineering practice as well as guidance for the higher level Offshore Service Specifications and Offshore Standards. DNV Offshore Codes are offered within the following areas: A) Qualification, Quality and Safety Methodology B) Materials Technology C) Structures D) Systems E) Special Facilities F) Pipelines and Risers G) Asset Operation H) Marine Operations J) Wind Turbines O) Subsea Systems

Amendments and CorrectionsWhenever amendments and corrections to the document are necessary, the electronic file will be updated and a new Adobe PDF file will be generated and made available from the Webshop (http://webshop.dnv.com/global/).

Comments may be sent by e-mail to rules@dnv.com For subscription orders or information about subscription terms, please use distribution@dnv.com Comprehensive information about DNV services, research and publications can be found at http://www.dnv.com, or can be obtained from DNV,Veritasveien 1, NO-1322 Hvik, Norway; Tel +47 67 57 99 00, Fax +47 67 57 99 11.

Det Norske Veritas. All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means, including photocopying and recording, without the prior written consent of Det Norske Veritas. Computer Typesetting (Adobe FrameMaker) by Det Norske Veritas.

If any person suffers loss or damage which is proved to have been caused by any negligent act or omission of Det Norske Veritas, then Det Norske Veritas shall pay compensation to such person for his proved direct loss or damage. However, the compensation shall not exceed an amount equal to ten times the fee charged for the service in question, provided that the maximum compensation shall never exceed USD 2 million. In this provision "Det Norske Veritas" shall mean the Foundation Det Norske Veritas as well as all its subsidiaries, directors, officers, employees, agents and any other acting on behalf of Det Norske Veritas.

Amended October 2009 see note on front cover

Offshore Standard DNV-OS-A101, October 2008 Changes Page 3

CHANGES General

Being class related, this document is published electronically only (as of October 2008) and a printed version is no longer available. The update scheme for this category of documents is different compared to the one relevant for other offshore documents (for which printed versions are available). For an overview of all types of DNV offshore documents and

their update status, see the Amendments and Corrections document located at: http://webshop.dnv.com/global/, under category Offshore Codes. Main changes

Since the previous edition (October 2008), this document has been amended, latest in October 2009. All changes have been incorporated. The changes are considered to be of editorial nature, thus no detailed description has been given.

DET NORSKE VERITAS

Offshore Standard DNV-OS-A101, October 2008 Page 4 Changes

Amended October 2009 see note on front cover

DET NORSKE VERITAS

Amended October 2009 see note on front cover

Offshore Standard DNV-OS-A101, October 2008 Contents Page 5

CONTENTSSec. 1A A A A B B B B 100 200 300 400

General................................................................... 7Introduction....................................................................... 7 Objectives ......................................................................... 7 Classification .................................................................... 7 Alternative solutions ......................................................... 7 General.............................................................................. 7 DNV Offshore Standards.................................................. 7 DNV Recommended Practices ......................................... 7 Other references................................................................ 7 General.............................................................................. 7

Sec. 4A 100 A 200

Hazardous Area Classification.......................... 17Objective......................................................................... 17 Application ..................................................................... 17

A. Introduction ............................................................................ 7

A. General..................................................................................17

B. Basic Principles ....................................................................17B 100 B 200 B 300 C 100 Definition of hazardous areas ......................................... 17 Hazardous fluids (sources) ............................................. 17 General principles for area classification ....................... 17

B. Normative References ............................................................ 7100 200 300 400

C. Extent of the Hazardous Zone ..............................................17General............................................................................ 17

C. Informative References........................................................... 7C 100

D. Openings, Access and Ventilation Conditions .....................18D 100 D 200 D 300 D 400 D 500 D 600 D 700 E 100 General............................................................................ 18 General requirements for mechanical ventilation systems............................................................................ 18 Supplementary requirements for overpressure protection of enclosed spaces ......................................... 18 Loss of ventilation in hazardous areas dependent upon mechanical ventilation ........................................... 18 Dilution ventilation......................................................... 18 Air locks.......................................................................... 18 Ventilation of battery compartments .............................. 19 General requirements...................................................... 19

D. Definitions .............................................................................. 8D 100 D 200 D 300 E 100 Verbal forms ..................................................................... 8 Definitions ........................................................................ 8 Abbreviations.................................................................... 9 General............................................................................ 10

E. Documentation...................................................................... 10

Sec. 2A 100 A 200

Design Principles and Accidental Loads........... 11Objective......................................................................... 11 Application...................................................................... 11

E. Electrical Installations in Hazardous Areas..........................19

A. General.................................................................................. 11

Sec. 5A A A A 100 200 300 400

Emergency Shutdown (ESD) Principles........... 20Objectives ....................................................................... 20 Application ..................................................................... 20 Definition........................................................................ 20 Basic provisions.............................................................. 20 General............................................................................ 20 General............................................................................ 20

B. Design Principles.................................................................. 11B 100 B 200 C 100 D D D D D D D Main principles ............................................................... 11 Additional requirements ................................................. 11 General............................................................................ 11

A. General Requirements ..........................................................20

C. Design for Accidental Loads ................................................ 11 D. Generic Design Accidental Loads ........................................ 11100 200 300 400 500 600 700 General............................................................................ 11 Dropped objects .............................................................. 11 Collision loads ................................................................ 12 Unintended flooding ....................................................... 12 Loads caused by extreme weather .................................. 12 Ex