Vol09 Pt01 Issue 01 Submarine Structures

7/22/2019 Vol09 Pt01 Issue 01 Submarine Structures

1/27

UNCLASSIFIED

AUSTRALIAN DEFENCE FORCE

MARITIME MATERIEL REQUIREMENTS SET

DEF(AUST)5000Vol 09 Pt 01 Iss 01Dated: 12

thOct. 2009

Replacing/Superseding

Nil

Volume 09Submarine System requirements

Part 01

Submarine Structures

Usage: Maritime

Commonwealth of Australia 2009

This work is copyright. You may download, display, print and reproduce this material in unalteredform only (retaining this notice) for your personal, non-commercial use within your organisation.All rights are reserved. Requests and enquiries concerning reproduction and rights should be

addressed to the Manager, Legislative Service, AusInfo: GPO Box 1020, CANBERRA ACT 2601or by e-mail to: [email protected]

UNCLASSIFIED

Uncontrolled when printed or downloaded. Refer to web-site:http://defweb.cbr.defence.gov.au/home/documents/navycoll.htm
http://defweb.cbr.defence.gov.au/home/documents/navycoll.htmhttp://defweb.cbr.defence.gov.au/home/documents/navycoll.htmmailto:[email protected]


2/27

UNCLASSIFIEDDEF(AUST)500 Vol09 Pt 01-lss 01

PROMULGATION

UNCLASSIFIED

Sponsor

Signed:Name: G. K WatsonAppointment:Principal N aval Architect - Directorate ofSubmarine EngineeringDate:

Uncontrolled when printed or download ed. Refer to web site:htt~://defweb.cbr.defence.qov.au/home/documents/navvcoll.htm

1 >

MRS CMAAudit Document Format Requirements

Signed:Name: P F. KingAppointment:MRS Configuration Management Authority

Date: O ~4MRS Peer Review Group

Assign Document Maturity Level

Signed:Name: G. K. WatsonAppointment:Principal Naval A rchitect- Directorate ofSubmarine Engineering

5

Director Head Navy Engineering DivisionApprove Technical Content Autho iseflelease for ADO Use

Signed: Signed:Name: Andrew Horobin Appointme

Date: x 7 ............... Date:

I >>

Date: ............P .? . / .~.Y

Assistant DirectorPass Technidil Content

/ ,

Signed:Name: G K. WatsonAppointment:Principal Naval Architect- Directorate ofSubmarine EngineeringDate: .?-.9/.9.l ?.qML 2


3/27

UNCLASSIFIED

DEF(AUST)5000Vol 09 Pt 01 SecIss 01

1

UNCLASSIFIED


DEF(AUST)5000 CHANGE PROPOSAL

INSTRUCTIONS

1. This page is to be used to report specific errors, omissions or to suggest improvements to this publication.2. Please attach additional comments/drawings/sketches as necessary.

3. Copies are to be forwarded for follow-up action to:

a. Director of Submarine Engineering (DSME), South Australia

PO Box 1292, North Haven SA. 5018

and

b. Navy Specification and Technical Documents Centre (NSTDC), Campbell Park Offices, CP4-SP-WS013,MDP9401, Department of Defence, CANBERRA ACT 2600, or alternatively

c. Change proposals can be submitted electronically using the User Feedback form located onthe DEF(AUST)5000 DEFWEB site: http://defweb.cbr.defence.gov.au/home/documents/navycoll.htm

PROPOSED CHANGE

Proposal:

The Above Discrepancy Materiel Safety Materiel Capability Other

ORIGINATING SOURCES CONTACT DETAILS

Organisation/Ship/Establishment:

Submitted by:

Signature Printed Name Rank/Designation E-mail Address Date

Recommended by Yes NoSignature Printed Name Rank/Designation E-mail Address Date

SPONSORS ACTION

Document Sponsor:Change Proposal isApproved:

Yes NoComments:


Authorised by MRS-PRG:

http://defweb.cbr.defence.gov.au/navysyscom/mrs/RAN_MRS_PAGE.htmlhttp://defweb.cbr.defence.gov.au/navysyscom/mrs/RAN_MRS_PAGE.html


4/27

UNCLASSIFIED

DEF(AUST)5000Vol 09 Pt 01 Iss 01

2

UNCLASSIFIED


ISSUE HISTORY

Issue No. Issue Date Descript ion of Changes Affected Pages Sponsor s Name

01 12 Oct 2009 Initial Issue All Graham Watson

02

03

04

05

06

07

08

09

10


5/27

UNCLASSIFIED


3

UNCLASSIFIED


PREFACE

1. This document was prepared by the Directorate of Submarine Engineering and is an element of theDEF(AUST)5000ADF Maritime Materiel Requirements Set.

2. The general requirements specified herein are to be used in the generation of capability-specific functionand performance specifications associated with procurement, modification, maintenance, and repair ofmaritime materiel.

3. This document will be updated at regular intervals to reflect lessons learned and changes in NationalStandards, or to incorporate other nations standards required for collaborative activities.

4. Queries and comments regarding the use and/or interpretation of this document are to be directed to thesponsor.


6/27

UNCLASSIFIED


4

UNCLASSIFIED


TABLE OF CONTENTS

1 Scope ................................................................................................................................................ 51.1 Life Cycle .................................................................................................................................. 51.2 What is Covered ....................................................................................................................... 51.3 What is Not Covered................................................................................................................. 52 Documents ........................................................................................................................................ 62.1 Applicable Documents .............................................................................................................. 72.2 Referenced Documents ............................................................................................................ 83 DEFINITIONS, ACRONYMS AND ABBREVIATIONS ...................................................................... 93.1 Definitions ................................................................................................................................. 93.2 Acronyms................................................................................................................................ 103.3 Abbreviations .......................................................................................................................... 104 Background ..................................................................................................................................... 114.1 Significance to RAN................................................................................................................ 114.2 Consequences of Poor Performance or Hazard ..................................................................... 115 Functional and Performance Requirements.................................................................................... 125.1 General ................................................................................................................................... 125.2 Loads ...................................................................................................................................... 125.3 Pressure Hull Safety Factors .................................................................................................. 135.4 Overall Structure ..................................................................................................................... 145.5 Structural Elements................................................................................................................. 145.6 Watertight and Oil Tight Structure........................................................................................... 175.7 Materials ................................................................................................................................. 175.8 Fabrication .............................................................................................................................. 185.9 Welding................................................................................................................................... 195.10 Non Destructive Examination.................................................................................................. 195.11

Maintainability ......................................................................................................................... 20

5.12 Signature................................................................................................................................. 206 DESIGN AND PRODUCT CONSTRAINTS..................................................................................... 216.1 Specific Design/Engineering Constraints................................................................................ 216.2 Navy Practice Constraints....................................................................................................... 216.3 Navy Personnel Constraints ................................................................................................... 216.4 Navy Logistic Constraints ....................................................................................................... 216.5 Australian Industry Constraints............................................................................................... 216.6 Legislative Constraints............................................................................................................ 216.7 Interoperability Constraints ..................................................................................................... 216.8 Commonality Constraints........................................................................................................ 216.9 Regulatory Constraints ........................................................................................................... 217 Deliverables (DIDs) ......................................................................................................................... 227.1 General ................................................................................................................................... 227.2 Tender Deliverables................................................................................................................ 227.3 Pre Contract Deliverables ....................................................................................................... 247.4 During Contract Deliverables .................................................................................................. 247.5 Contract Deliverables.............................................................................................................. 247.6 Manufacture ............................................................................................................................ 247.7 Test Regime............................................................................................................................ 247.8 Maintenance/Hull Survey ........................................................................................................ 24


7/27

UNCLASSIFIED


5

UNCLASSIFIED


1 SCOPE

1.1 Life Cycle

1.1.1 This document is applicable throughout the life of the submarine from conception until disposal.

Together with the documents and drawings referred to herein, it is subject to periodic revision. TheShipbuilder must ensure that he is in possession of the correct edition for each particular tender orcontract. Enquiry in this regard should be made to the Department.

1.2 What is Covered

1.2.1 This document specifies high level structural requirements for RAN Submarines. It is generally basedon the supposition that acceptable rules and requirements for the particular submarine hull designbasis are currently in existence. The set of structural design rules, codes and standards employed fora particular submarine must be authorised in accordance with Navy regulatory requirements. Incases where the design deviates from this MRS Part, the designer is to itemise and justify nonadherence for these requirements.

1.2.2 Reference to any document/drawing also implies reference to any other relevant document/drawingcited therein.

1.2.3 The requirements of this standard shall take precedence over all documents quoted herein. Whereanomalies occur in the documents quoted this should be brought to the attention of the MRSConfiguration Management Authority.

1.3 What is Not Covered

1.3.1 The document may not cover all aspects of submarine structural design. The onus on the designer isalways to use good practice and best engineering judgement to ensure that the whole structure is fitfor purpose and safe to personnel, the public and the environment.


8/27

UNCLASSIFIED


6

UNCLASSIFIED


2 DOCUMENTS

DISCLAIMER NOTICE

If any information in this publ ication is attributed to another work the reader should consultthat work to ensure the accuracy of the information contained in this publication.Should there be any discrepancy between this publ ication and the other work no personshould rely on the contents of this publication without first ob taining advice from the Office ofthe Head Navy Engineering.

The Commonwealth, the authors, consultants and editors are not responsible for the resultsof any actions taken on the basis of information in this publication which is attributed toanother work if:

(a) the reader has failed to consult that other work to ensure the accuracy ofthe information contained in this publication which is attributed to that otherwork; or

(b) there is a discrepancy between the information contained in this publicationwhich is attributed to another work and that other work and the person has failedto f irst obtain advice from the Office of the Head Navy Engineering.

The Commonwealth, and the authors, consultants and editors , expressly disclaim all and anyliability and responsibi lity to any person, whether a reader of th is publication or not,in respect of anything, and of the consequences of anything, done or omitted to be done byany such person in reliance, whether wholly o r partially, upon the whole or any part ofthe contents of this publication which is attributed to another work if:

(a) the reader has failed to consult that other work to ensure the accuracy of theinformation contained in this publication which is attributed to that other work; or

(b) there is a discrepancy between the information contained in this publicationwhich is attributed to another work and that other work and the person has failed

to f irst obtain advice from the Office of the Head Navy Engineering.

If the reader of this publication discovers any item of information in this publication whichappears to be incorrect, then the onus is on the reader to verify whether this information iscorrect with the Office of the Head Navy Engineering.


9/27

UNCLASSIFIED


7

UNCLASSIFIED


2.1 Applicable Documents

2.1.1 The following documents are called up in this document. When applying this DEF(AUST)5000

document, the user is required to use the dated version if specified, or otherwise negotiate with thesponsor a suitably dated version for each applicable document.

2.1.2 In accordance with DI(G) LOG 4511 Defence Policy on Materiel Standardisationdocumentselection shall be based on the following order of precedence. Noting that in situations where noother standard adequately addresses the ADOs requirements, Australian Defence Standards are tobe used in preference to other standards. Government, operational and/or technical imperatives canoverride preference to other standards:

Aust ral ian Defence Documents

List of Applicable Documents Applicability and Availability

ABR 6492 Navy Technical Regulations Manual Australian DOD specification.

http://intranet.defence.gov.au/- policy / documents

SUBSAFE Series Australian DOD specifications.

http://intranet.defence.gov.au/- policy / documents

DEF(AUST) 5000 Vol 2 Part 2 - General requirementsfor RAN Submarines

Australian DOD specification

http://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asp

DEF(AUST) 5000 Vol 9 Part 11 Watertight Integrityand Recovery from Flooding



DEF(AUST) 5000 Vol 3 Part 5 - RAN WeldingStandard



DEF(AUST) 5000 Vol 2 part 6 - General ShockRequirements



DEF(AUST) 5000 Vol 2 part 7 Classified ShockRequirements - General



DEF(AUST) 5000 Vol 2 part 8 Vibration Australian DOD specification


DEF(AUST) 5000 Vol 2 part 19 RAN EngineeringDrawing Requirements.



DEF(AUST) 5000 Vol 2 part 28 Ship ElectronicProduct Modelling.



DEF(AUST) 5000 Vol 3 part 4 - Painting Australian DOD specification

http://defweb.cbr.defence.gov.au/navysyscom/mrs/homepa
http://intranet.defence.gov.au/http://intranet.defence.gov.au/http://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://intranet.defence.gov.au/http://intranet.defence.gov.au/


10/27

UNCLASSIFIED


8

UNCLASSIFIED


ge.asp

DEF(AUST) 5000 Vol 3 part 10 - Weight Control Australian DOD specification


DEF(AUST) 5000 Vol 3 part 16 - Cathodic Protection Australian DOD specification


DEF(AUST) 5000 Vol 9 Part 7 - Submarine Escapeand Rescue



DEF(AUST) 5000 Vol 9 Part 5 - Explosive Stowages inSubmarines



DEF(AUST) 5000 Vol 9 Part4 Submarine

Hydrodynamics, Manoeuvring and Control



DEF(AUST) 5000 Vol 9 Part 2 - RAN Submarines HullSurvey Requirements



2.2 Referenced Documents

2.2.1 The following documents were used in the development of this MRS Part. The appropriateinformation from these documents has been included and the authors are hereby acknowledged.

General Specifications for Ships of the United States Navy, 1994 Ed.
http://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asphttp://defweb.cbr.defence.gov.au/navysyscom/mrs/homepage.asp


11/27

UNCLASSIFIED


9

UNCLASSIFIED


3 DEFINITIONS, ACRONYMS AND ABBREVIATIONS

3.1 Definitions

3.1.1 Requirement definitions used throughout DEF(AUST)5000 documents are contained in theDEF(AUST)5000Vol 01 Pt 03MRS Definitions andAbbreviations. Additional definitions notcurrently provided in the fore mentioned reference are listed as follows:

Minimum Collapse Depth(MCD)

is the depth at which the pressure hull as built has an acceptably lowprobability of collapse if taken there once, assuming that all allowable(by specification) departures from standards are adverse.

Nominal Collapse Depth is the depth at which pressure hull collapse is predicted by calculationassuming that material properties, structural scantlings and ring frameout of circularity are their nominated rather than minimum values.

Deep diving depth (DDD) is the maximum depth, measured to the underside of the keel, to whichthe submarine shall be capable of unrestricted operation.

Deep Diving DepthPressure (DDDP)

is the sea water pressure at DDD.

Watertight: Structure that is watertight must withstand the designed head ofpressure without deformation and without weeping or beading at seals orpenetrations.

Airtight: Structure that is airtight must withstand an overpressure test of 15millibars.

Gastight Structure that is gastight must withstand a vacuum test of 5millibars.

Minor StructureStructure that does not in any way contribute to the main structuralstrength or watertight integrity of the vessel. Examples of minor structureare linings and false deckheads, partitioning, lockers and furnishings andnon-watertight bulkheads.

Secondary Structure Structure that does not contribute significantly to the strength of thevessel but does contribute to significant operational, OHS, water andairtight integrity. Examples of secondary structure are, External tanksstructure not subject to full DDD pressure, Internal tanks structure notsubject to full DDD pressure and Flats and decks.

Primary Structure Structure that contributes significantly to the watertight integrity andstrength of the vessel. Failure in this structure would lead to overallcollapse of the submarine or to uncontrollable flooding. Examples ofprimary structure include pressure hull, pressure hull frames, watertightbulkheads including frames and shear plates, hatches and coamings,SUBSAFE boundary equipments


12/27

UNCLASSIFIED


10

UNCLASSIFIED


Critical Structure Structure within high stress areas of the pressure hull where FOS isapproaching design limits. Critical structure is determined by designanalysis or through test and examination of existing structure. Examplesof critical structure may include junction of pressure hull with bulkheadsor deep frames, junction of shear plates with bulkheads or pressure hull,

junction of hatch coamings, conning or escape towers, SSEs or otherlarge penetrations with the pressure hull, primary structure with knowndefects which increase local stress levels above original design stressesand any other structural discontinuities.

3.2 Acronyms

3.2.1 The majority of acronyms used in this document are contained in the ADFP 103Abbreviations andMilitary Symbolsor the Macquarie Dictionary

3.3 Abbreviations

3.3.1 Requirement abbreviations used throughout DEF(AUST)5000 documents are contained in theDEF(AUST)5000Vol 01 Pt 3MRS Definitions andAbbreviations. Additional abbreviations notcurrently provided in the fore mentioned reference are provided as follows:

MCD Minimum Collapse Depth

DDD Deep Diving Depth

DDDP Deep Diving Depth Pressure

OCD Operational Concept Document

DAR Design Acceptance Representative

TRA Technical Regulatory Authority

UUC Usage Upkeep Cycles

IP Intellectual Property

Lbp Length between perpendiculars


13/27

UNCLASSIFIED


11

UNCLASSIFIED


4 BACKGROUND

4.1 Signi ficance to RAN

4.1.1 Safety Aspects. The design of the pressure hull is critical to the maintenance of the safety of thesubmarine crew through the full range of operating depths of the submarine. The design ofsecondary structure and equipment mounts is also critical to the maintenance of safety under ashock environment.

4.1.2 Capabil ity Aspects. The design of the pressure hull, secondary structure and equipment mounts iscritical to the maintenance of operational capability following shock loads. The detail of the design tominimise the likelihood and impacts of corrosion is also critical to the ability to sustain the capabilityin a cost effective and timely manner.

4.1.3 Environmental Aspects. Ensures sufficient strength to prevent an environmental hazard in thecase of a minor collision.

4.2 Consequences of Poor Performance or Hazard

4.2.1 Poor design can lead to catastrophic loss of the submarine or loss of life. Poor detailed design canalso lead to expensive and drawn out repairs to structure to repair corrosion, weld failures or fatiguecracking which can create high cost of ownership and reduced submarine availability.


14/27

UNCLASSIFIED


12

UNCLASSIFIED


5 FUNCTIONAL AND PERFORMANCE REQUIREMENTS

5.1 General

5.1.1 The operational conditions ie, operation area and required life for which the submarine is to bedesigned shall be as detailed in the OCD. The OCD shall define the required DDD and the designfatigue life of the pressure hull against diving cycles.

5.1.2 RAN submarines shall be designed to withstand all the loads and environmental condition to which itmay be subjected over its lifetime. The resulting stresses, deformation and failure after damage areto be within acceptable limits as appropriate to the calculation method employed.

5.2 Loads

5.2.1 Loading on structure as a minimum is to consider the following:

5.2.1.1 hydrostatic and hydrodynamic pressure on the hull,

5.2.1.2 pressure/ load due to internal fluid loadings, equipment and stowage,

5.2.1.3 pressure/ load due to operational equipment,

5.2.1.4 pressure/ load due to flooding after damage,

5.2.1.5 environmental loads such as wind, green seas and ice,

5.2.1.6 shock pressure loads and accelerations,

5.2.1.7 rolling and pitching motions of the submarine and

5.2.1.8 accidental loadings for example detonation of pyrotechnics or Special Forces weapons.

5.2.1.9 Bottoming/docking submarine

5.2.2 The resulting stresses from such loading shall be to a level of accuracy appropriate to the calculationmethod employed.

5.2.3 For the purpose of calculation, the submarine loading to be considered is to include the maximumcombined static and dynamic loads applied with and without End of Life (EOL) growth margins. If anyother conditions are more severe then this is also to be considered.

5.2.4 The calculation procedures are at the discretion of the designer but subject to the approval of theDAR. Regardless of the procedure used the initial imperfections and residual stresses expectedduring construction are to be taken into account in all relevant calculations.

5.2.5 Shock

5.2.5.1 Underwater weapons can produce damage to the hull by shock and whipping effects. If theexplosion is in the near vicinity of the hull, the effect can be catastrophic.

5.2.5.2 Requirements of the OCD and DEF(AUST) 5000 Vol 2 Parts 6 and 7 shall be satisfied.

5.2.5.3 In order to avoid rupture of structure resulting from underwater explosion the following designguidance should also be employed:

5.2.5.3.1 Avoid hard spot which can cause stress concentration,

5.2.5.3.2 Avoid large difference in stiffness of adjoining members,

5.2.5.3.3 Ensure good continuity of girders and other structural members,

5.2.5.3.4 Avoid use of unsymmetrical stiffening,

5.2.5.3.5 Do not employ brittle materials in the hull structure, associated fittings and pressure tightenclosures exposed to external seawater pressures,


15/27

UNCLASSIFIED


13

UNCLASSIFIED


5.2.5.3.6 Adequately support the hull fittings,

5.2.5.3.7 Shock clearances shall be provided where required,

5.2.5.4 Pressure hull material and weld shock survivability shall be demonstrated by bulge explosiontesting or another method deemed appropriate by the DAR.

5.2.5.5 Compliance to performance criteria after exposure to shock at the levels detailed in the OCD shallbe demonstrated by OQE to the extent deemed suitable by the DAR.

5.2.6 Vibration

5.2.6.1 Consideration is to be given to structural vibration either from cyclic sea loads, machinery or othersources. Appropriate measures are to be taken to eliminate high stress or resonance resultingfrom such phenomenon. Further requirements are provided by DEF(AUST) 5000 Vol 2 part 8 Vibration.

5.2.7 Docking

5.2.7.1 The keel and hull structure shall be designed to withstand the loads imposed by the worst dockingcondition, taking account of any overhang at bow or stern. Limiting docking conditions imposed

by the hull structure are to be identified on the docking drawings.5.2.8 Damage

5.2.8.1 Strength and watertight integrity of the submarine structure following damage due to abnormalloadings must be assessed.

5.2.8.2 The type and extent of damage due to military action will be as detailed in the OCD.

5.2.8.3 The extent of collision damage to external non-pressure hull plating is to be taken as:

5.2.8.3.1 Length - 4 percent Lbp anywhere along the external tank structure

5.2.8.3.2 Width - inboard up to but not including the pressure hull plating

5.2.8.4 The extent of grounding damage is to be taken as:

5.2.8.4.1 Length - 10 percent Lbp anywhere forward of amidship

5.3 Pressure Hull Safety Factors

5.3.1 The chosen order of failure and the factors of safety against failure are to be consistent with a wellproven pressure hull design methodology. The rationale used for the selected factors shall bedocumented and subject to acceptance by the TRA. The factors of safety shall be developed inconjunction with the selected builder with due regards for the actual manufacturing capabilitiesrelative to circularity, straightness, frame tilt and available materials. An important criterion to besatisfied in the selection of the factors of safety for the submarine structure shall be the minimising ofself weight.

5.3.2 As a minimum, design factors of safety for the pressure hull shall consider residual stresses, hull

circularity, frame and plate tolerances as follows:5.3.2.1 Initial yielding not causing instability (typically 1.3 DDD)

5.3.2.2 Frame yielding due to out of circularity (typically 1.75 DDD)

5.3.2.3 Axi-symmetric yielding (typically 2.0 DDD)

5.3.2.4 Local instability (typically 4.0 DDD)

5.3.2.5 Global instability (typically 4.5 DDD)

5.3.2.6 In-plane compressive and/or shear stresses within plates

5.3.2.7 Primary and secondary stiffening members subject to axial compression and shear.


16/27

UNCLASSIFIED


14

UNCLASSIFIED


5.3.3 Cyclic stresses shall be at a level which does not incur fatigue cracking in the primary or secondarystructure at any stage through life. Diving cycles shall be as defined in the OCD.

5.4 Overall Structure

5.4.1 Hull construction details shall not adversely affect the quiet running of the submarine. Hatches,fittings, topside gear, and piping shall be designed and installed to be free of rattles. Hull attachedprotuberances shall be hydrodynamically shaped to minimise the generation of flow noise. Structuraldetails, such as size of panels or relatively long thin struts connected to plating, shall be designed tobe as resonance-free as possible, both locally and generally.

5.4.2 Every effort shall be made to minimize the number of pressure hull penetrations.

5.4.3 Hollow shafts and masts that penetrate the pressure hull shall withstand an internal pressure equal tothe pressure at minimum design collapse depth.

5.4.4 Holes shall have smooth boundaries, free from notches or re-entry angles from which cracks may bepropagated. In general, holes in structure shall be circular. Where circular openings are notpracticable, the corner radii of rectangular openings in pressure hull shell plating shall be designed to

minimise stress concentration. If the size or location of an opening is such as to impair the strength ofan important structural member, measures shall be taken to reduce the unit stress in way of the hole.

5.4.5 Drain and air holes shall be provided to avoid the entrapment of water pools or air bubbles withintanks and bilges.

5.4.6 Openings with portable covers shall be provided for access to equipment requiring maintenanceoutside of docking availabilities and for anode replacement. Access to such equipment shall notrequire cutting of structure. Replacement of anodes shall not require cutting in close proximity to thepressure hull.

5.4.7 Particular attention is to be paid to the bilges because of the history of general wastage andmicrobiologically induced corrosion found there. Where possible the bilges should be sited in areasof low stress. Alternately consideration should be given to the use of thicker plate to provide anincreased allowance for corrosion.

5.4.8 Any pressure tight enclosures exposed to external seawater pressure shall be designed to avoidsudden collapse or sited to minimise the effects of implosion on surrounding structure, equipment,piping etc.

5.5 Structural Elements

5.5.1 Pressure Hull

5.5.1.1 The pressure hull, all trunks and other types of structure penetrating the pressure hull shall be ofapproved material.

5.5.1.2 A representative number of randomly selected sites shall be ultrasonically inspected for possiblecracking into the pressure hull prior to delivery and as part of the in service hull survey program.

5.5.1.3 Any discontinuities discovered ultrasonically shall be pursued to their extremities.

5.5.1.4 Submarine pressure hull structure to be designed to a minimum factor of safety of collapse depthover DDD.

5.5.1.5 An assessment of the consequences of an impact by an exercise torpedo on the pressure hullshall be undertaken.

5.5.2 Pressure Hull Frames

5.5.2.1 Pressure hull frames, and structure acting as pressure hull frames, shall be located within thetolerances specified.

5.5.2.2 Framing tolerances shall be designed for local stiffness, to resist panting, shock, and vibration andsupport the shell plating against wave impact.


17/27

UNCLASSIFIED


15

UNCLASSIFIED


5.5.2.3 Struts shall be so designed that they will not tend to tilt the frames when subjected to explosiveloading.

5.5.2.4 Framing in way of torpedo ejection pumps or cylinders shall be arranged to allow full free-flow ofwater to the inlets of the pumps or cylinders.

5.5.2.5 The pressure hull framing shall be strengthened in addition to normal frame requirements, asnecessary, to support the local loads exerted by the various components located in the space.

5.5.2.6 The attachment of structure such as tank tops, lead pocket boundaries and foundations, to theedges of pressure hull frame flanges shall be accomplished by using full penetration welds.

5.5.2.7 Attachments to the edges of pressure hull frames shall be kept to a minimum.

5.5.3 External Hull Plating (excluding Pressure Hull Plating)

5.5.3.1 Seams and butts of shell plating shall be full penetration welded joints. Plating shall be secured toframes, floors, tanks, and longitudinals by welding. An accurate fit shall be obtained between allmembers, and the designed form of all surfaces of plating and supporting framework shall bemaintained. Plate thickness shall be retained within tolerances.

5.5.3.2 Location and sizing of the main ballast tank flood holes shall minimize residual water in thesetanks. The flooding area for ballast tanks shall be large enough to ensure that the allowable stressfor the ballast tank structure will not be exceeded when the tanks are blown at the specified airblow rate.

5.5.4 Stanchions

5.5.4.1 Stanchions shall be designed to withstand the most severe probable combination of forces towhich they will be subjected.

5.5.4.2 The connections at the heads and heels of stanchions shall be sufficient to develop the fullstrength of the stanchions.

5.5.4.3 Where it is necessary to fit portable stanchions, the bolted connection shall develop the fullstrength of the stanchion in the appropriate direction of loading. No other holes for bolts, threaded

connections, or for any other purpose shall be made in stanchions.5.5.5 Bulkheads

5.5.5.1 Bulkheads are to be designed elastically. The load is to be based on the test head that thebulkhead is to withstand and if exposed to DDD this shall be a pressure equivalent to MinimumCD. Other loads are to be considered taking into account the dynamic effects of tank filling andthe effects of fluid motion due to ship motion.

5.5.5.2 Due account is to be taken of in-plane loads on bulkheads such as heavy equipment and waterpressure such that buckling of plating or stiffeners do not occur.

5.5.5.3 Where transverse bulkheads connect to the hull they are to be designed to resist underwaterexplosion at the shock level specified in clause 2.1.2. The structure is to be designed such thatneither the hull nor the bulkhead structure ruptures prematurely following significant plastic

deformation that could be expected.

5.5.5.4 Watertight structural bulkheads shall provide support to the pressure hull, decks, machinery, andequipment, and serve as a water-containment boundary between compartments.

5.5.5.5 Bulkheads shall be designed to provide adequate strength for the submarine as a whole and shallwithstand the following loads:

5.5.5.5.1 Design hydrostatic heads.

5.5.5.5.2 Dead loads due to mass of structure and equipment and due to docking.

5.5.5.5.3 Design shock loads.

5.5.5.5.4 Loads induced by supporting the pressure hull when subject to combined loading ofsubmergence and shock.


18/27

UNCLASSIFIED


16

UNCLASSIFIED


5.5.5.6 Transverse bulkheads shall be continuous through platforms.

5.5.5.7 Attachments to bulkheads for the purpose of supporting local masses shall be made so as not toimpair the strength or tightness of the bulkhead. Insert and margin plates, special framing andstiffening shall be fitted as necessary to distribute local stress, and, as far as practicable, theattachments shall be made to the special framing and not directly to the bulkhead.

5.5.5.8 Primary stiffeners shall be continuous for the full width of bulkhead. Generally, stiffeners shall befitted on only one side of a bulkhead.

5.5.5.9 Butts in stiffeners shall not be located in regions of high bending stress, insofar as practicable.

5.5.5.10 Wherever practicable, bulkhead stiffeners shall be kept out of passageways, showers,washrooms, and water closet spaces.

5.5.5.11 Doors and other openings shall be located so that as few stiffeners as practicable are cut, and thestructural efficiency of the bulkhead is not impaired.

5.5.5.12 Where necessary, chafing plates, castings, or half-rounds shall be fitted to protect the structurefrom the whip of the anchor chains. Stiffeners on chain locker bulkheads shall be fitted on theside opposite the chain.

5.5.5.13 Non-tight structural bulkheads are those which support platform decks, machinery, or equipment,but do not serve as a containment boundary. Provisions shall be made to prevent damage due toradial and longitudinal hull contraction due to submergence.

5.5.5.14 Provision shall be made to prevent damage caused by the longitudinal and radial contraction fromthe combined loading of both submergence and shock.

5.5.5.15 Bulkheads supporting noise-generating equipment shall not be attached to stanchions which areconnected to pressure hull frames.

5.5.6 Decks and Platforms.

5.5.6.1 Platform plating shall be of watertight construction, but not required to withstand pressure.Coamings, or a method of sealing shall be provided in the platform decks around openings for

groups of pipes and cables to prevent incidental water spilling into the spaces below. Sufficientclearance shall be maintained between the coamings and resiliently hung piping passing throughto eliminate the possibility of sound shorts. Drainage of deck water shall be provided from theplatform decks to the bilges.

5.5.6.2 Portions of platform decks shall be portable to permit removal of complete equipments which aresized to pass through the logistics hatch without disassembly.

5.5.6.3 Portable or hinged section of platform decks shall be provided where access is required. Thesesections shall be rattleproof.

5.5.6.4 The connection used to join the deck structure to the hull structure shall be designed to allow forhull flexure during depth changes with a minimum of joint-induced noise and to minimize transferof such noise as may be generated through the hull to the water.

5.5.7 Casing

5.5.7.1 The casing shall be designed for wave-slap loading

5.5.7.2 The structure shall be designed with a minimum safety factor of two for elastic instability of amember under stresses caused by wave-slap.

5.5.7.3 The casing shall also be provided with rattleproof hinged or portable sections to provide access toall parts under the casing.

5.5.7.4 Vent holes shall be sized to the minimum which will permit submergence in the time specified.

5.5.7.5 Sufficient drain holes shall be provided to permit the casing to drain completely when surfacingwithout exceeding stability limits.


19/27

UNCLASSIFIED


17

UNCLASSIFIED


5.5.8 Fin

5.5.8.1 The fin shall be free flooding with flooding and venting openings to permit submergence in thetime specified in the OCD. Venting openings shall be located and designed to minimize the entryof seawater from waves and spray.

5.5.8.2 Fin scantlings including bridge shall be designed for a sea slap loading on the projected areas.

5.5.8.3 The structure shall be designed with a minimum factor of safety of two for elastic instability of themember under stresses caused by wave-slap and shock.

5.5.8.4 Foundations for diving planes may be part of the fin structure.

5.5.8.5 Care shall be taken in the design to prevent deflection of diving plane supports or other fittedequipments from affecting alignment of periscopes and masts.

5.5.8.6 Acoustic window foundations and supporting structural members shall have sufficient strengthand rigidity to maintain fin integrity under wave-slap.

5.5.9 Bollard, Anchoring and Mooring

5.5.9.1 Structure supporting any bollard or deck used for anchoring, mooring or towing shall be designed

such that the structure shall not fracture before the cable breaking load is reached.

5.5.10 Control Surfaces and Hydroplanes

5.5.10.1 The rudder and stock shall be designed for the maximum shock and hydrodynamic loadings..The structural arrangement shall be conducive to ease of access for construction andpreservation.

5.5.11 Keel

5.5.11.1 Although keels do not significantly contribute to the strength, they experience similar longitudinalstress levels. The design of the keel shall ensure that stress concentrations are reduced to aminimum, appropriate grade of material selected and that appropriate measures are taken toensure that crack propagation would be terminated prior to reaching the pressure hull.

5.5.12 Masts

5.5.12.1 Masts are to be designed to ensure that they provide adequate stiffness and strength for theequipment they support.

5.5.12.2 Account is to be taken of all vibration excitations and it is to be ensured that no resonantfrequencies occur. The submerged speeds at which the masts will be used are defined in theOCD.

5.6 Watertight and Oil Tight Structure

5.6.1 Watertight or oil tight structure shall not leak when subjected to pressure of the specified fluid,equivalent to the design head on the boundary. Tightness, in any degree, shall be attained bypositive means such as welding or gaskets/seals (for mechanical fastened structure only).

5.6.2 Stuffing tubes, flanged joints, or stuffing boxes shall be provided, as necessary, to safeguard thetightness of the bulkhead or deck wherever wiring trunks, pipe tunnels, or shaft tunnels terminate atthe bulkhead or deck..

5.7 Materials

5.7.1 The selection of material for the submarine structure shall take into consideration the existingtechnology and infrastructure available to form and weld the material.

5.7.2 The material selected in the design of the ship is to be appropriate to its location within the structureand the environmental condition in which the ship has to operate.


20/27

UNCLASSIFIED


18

UNCLASSIFIED


5.7.3 The materials used in the construction of the ship are to be manufactured and tested in accordancewith ISO or equivalent standards.

5.7.4 In addition to any other criteria deemed necessary to meet OCD requirements, the materialsproposed for the pressure hull structure should meet the following criteria regarding mechanicalproperties:

5.7.4.1 High yield strength

5.7.4.2 High toughness levels

5.7.4.3 Ability to withstand extreme deformation at high strain rates

5.7.4.4 Low susceptibility to stress corrosion cracking

5.7.4.5 Resistance to high stress low cycle fatigue

5.7.4.6 Resistance to corrosion or loss of properties at environmental extremes.

5.7.5 Forgings and Castings

5.7.5.1 The materials proposed for forgings and castings connected to the pressure hull shall have similar

properties to the pressure hull material while also proving resistant to the corrosion and erosionmechanisms associated with flowing or stagnant sea water under the specified environmentalconditions. They shall also be suitable for the proposed method of attachment to the pressurehull without increasing the potential for corrosion.

5.7.6 Materials Protection

5.7.6.1 All material is to be protected in accordance with DEF(AUST) 5000 Vol 3 Pt 04 Painting and Vol 3Pt16 Cathodic Protection as applicable.

5.7.6.2 Coatings in highly corrosive areas (eg Bilges and battery compartments) shall be individuallyqualified by testing.

5.7.6.3 Coatings for use in conjunction with anechoic tiles or radar absorbent materials shall beindividually qualified by testing.

5.7.6.4 Adhesives and procedures for attaching anechoic tiles shall be individually qualified by testing.

5.7.6.5 The hull and ballast tanks are required to be cathodically protected. Where dissimilar materialsare employed measures are to be incorporated to preclude galvanic corrosion.

5.7.6.6 Corrosion margins employed in the design of the structure are to be clearly identified in designdocumentation. If for any reason the structure can not be preserved in accordance with specifiedrequirements then an additional corrosion allowance is to be incorporated in the design.

5.8 Fabrication

5.8.1 Hull circularity and straightness of hull segments shall be achieved consistently to the requiredtolerances using proven and qualified fabrication control processes. These controls should utilise well

designed jigs and fixtures that accept and hold the hull plate segments in precise positions to enableproven weld procedures and sequences to be used to fabricate the circular hull form with a minimumof residual stress at welded joints.

5.8.2 In the fabrication and erection of hull structure, particularly welded structure, discontinuities,undercuttings, notches, nicks, or other mechanical damage which might initiate or propagate cracksor points of weakness leading to possible total failure of the structure shall be avoided.

5.8.3 Where local structure is subjected to significant loading, then the structure is to be fully integrated into the main hull structure.

5.8.4 Where part of a structural member has to be cut away, the reduction in strength shall becompensated for.


21/27

UNCLASSIFIED


19

UNCLASSIFIED


5.8.5 Discontinuous members on opposite sides of a through member shall line up back-to-back withinspecified limits of error in offset.

5.8.6 Cold working of high tensile and high yield strength steels shall be restricted as much as practicable.Because of the cold working effects of punching and shearing, notches cut in high strength steelsshall be cut by drilling or oxygen cutting only. Such material that has been cold-worked by shearingshall be removed by machining, oxygen cutting, or grinding.

5.8.7 Flanges and webs of pressure hull frames or bulkhead stiffeners shall not be drilled or punched forattachments of gratings, platforms, foundations, fittings and hangers.

5.8.8 Sharp or ragged edges of exposed structure, where likely to injure personnel or equipment, shall beremoved. Corners in passageways shall be rounded to present a finished appearance.

5.8.9 Where portions of bulkheads, decks, or other hull structures are left incomplete during the process ofwork, temporary fastenings or supports shall be fitted as necessary to prevent damage to the rest ofthe structure. Structure which will be inaccessible after erection shall be fully preserved.

5.8.10 The designer shall define all dimensional tolerances in conjunction with the selected builder.

5.8.11 The designer shall set requirements for the quality and traceability of all materials and components

used during the fabrication process. These requirements shall be subject to approval by the DAR.

5.9 Welding

5.9.1 Welding of RAN submarines shall be in accordance with DEF(AUST) 5000 Vol 3 Part 05.

5.9.2 All welds for primary structure including frame fabrication and shell connections shall be fullpenetration welds. Partial penetration joints shall not be used in any structure designed to withstandDDD pressure.

5.9.3 For design of welded joints, reference shall be made to the appropriate design or equipmentStandards.

5.9.4 The weld classification, positioning qualification procedures and NDE requirements are at the

discretion of the designer but they shall consider the technical capability of the selected builder andminimise the need for additional infrastructure.

5.9.5 Wherever possible the welds shall be placed in areas of low stress to allow the use of lower strengthconsumables and minimise weld preparation requirements while meeting the other criteria for thesubmarine structure materials. Where this is not possible the welds shall have similar performanceor better than the base material.

5.9.6 All welding and related processes shall be subject to approval by the DAR.

5.9.7 During fabrication a summary of the weld repairs undertaken shall be provided to the CoA on aregular basis at intervals to be agreed.

5.9.8 Fabrication contractors and subcontractors shall be accredited iaw DEF(AUST) 5000 Vol 3 Part 05requirements.

5.10 Non Destruct ive Examination

5.10.1 NDE shall be in accordance with standards approved by the DAR to provide assurance that nosurface or subsurface defects exist in any plane ie transverse or longitudinal

5.10.2 An NDE plan detailing the scope of examination to be undertaken on welds shall be developed bythe designer and endorsed by the DAR.

5.10.3 The NDE contractor shall be independent of the fabricator.

5.10.4 Proposed NDE procedures shall be submitted to the DAR for endorsement.

5.10.5 NDE personnel shall be subject to proficiency testing prior to starting and periodically when engaged.Results shall be available for audit by the TRA.


22/27

UNCLASSIFIED


20

UNCLASSIFIED


5.11 Maintainability

5.11.1 Access is to be provided for structural maintainability.

5.11.2 The maintenance policy shall aim for maximising the number of sea days while minimising thethrough life cost.

5.11.3 Areas with a high likelihood of corrosion shall be designed to enable inspections to be conductedwith minimal equipment removal.

5.11.4 Corrosion/metal loss allowances (general and localised) shall be provided for each component of theprimary and secondary structure.

5.11.5 Minor structure (brackets etc) attached to the outside of the pressure hull shall be attached usingdoubler plates to minimise the requirements for removal and reattachment of the structure to the hullthrough life.

5.11.6 When designing the layout of anechoic tiles consideration shall be given to the necessity to removetiles in some areas to provide access for external NDE of areas with difficult access and a highlikelihood of internal corrosion or fatigue induced cracking.

5.12 Signature

5.12.1 The geometric shape of the exposed surface of the hull above water shall be designed to reducesignatures to a level consistent with the requirements in the OCD.

5.12.2 The geometric shape of the hull shall be designed to reduce both the self radiated noise signatureand reflective sonar signatures to a level consistent with the requirements in the OCD.


23/27

UNCLASSIFIED


21

UNCLASSIFIED


6 DESIGN AND PRODUCT CONSTRAINTS

6.1 Specific Design/Engineering Constraints

6.1.1 There are no specific design/engineering constraints.

6.2 Navy Practice Constraints

6.2.1 There are no Navy Practice constraints.

6.3 Navy Personnel Constraints

6.3.1 There are no Navy Personnel constraints.

6.4 Navy Logistic Constraints

6.4.1 There are no Navy Logistic constraints.

6.5 Australian Industry Constraints

6.5.1 There are no Australian Industry constraints.

6.6 Legislative Constraints

6.6.1 There are no Legislative constraints.

6.7 Interoperability Constraints

6.7.1 There are no interoperability constraints.

6.8 Commonality Constraints

6.8.1 There are no commonality constraints.

6.9 Regulatory Constraints

6.9.1 There are no regulatory constraints.


24/27

UNCLASSIFIED


22

UNCLASSIFIED


7 DELIVERABLES (DIDs)

7.1 General

7.1.1 A statement by the DAR confirming compliance of the design with agreed requirements and rulesshall be provided.

7.1.2 All deliverables are to be presented as hard copy and as computer files (format agreed between thecontractor and TRA) on CD.

7.1.3 CoA ownership and/or access to IP and CoA access to designer support services throughout the lifeof the Class shall be subject to TRA agreement.

7.2 Tender Deliverables

7.2.1 Structural Report:

7.2.1.1 A structural calculation report demonstrating that the submarine has been designed to aconsistent set of recognised naval material standards as appropriate and acceptable to the TRAshall be provided. The report shall provide details of theoretical approach and methodologyemployed.

7.2.1.2 Calculations and analyses in English are to employ proven methods. For each main area ofanalysis, the report shall also include a discussion of calculation and analysis methods used,evidence of their accuracy and a discussion of assumptions made.

7.2.1.3 The report shall cover as a minimum hull, decks, frames, bulkheads, towers and all other structuresubject to operational loadings. Strength calculation shall include all hatches and covers that aresubject to load.

7.2.1.4 The report shall provide calculations showing that the pressure hull strength and local scantlingscomply with the requirements of the design rules. The calculations shall provide a description of

the longitudinal weight distribution of adequate frame increment for the full length of thesubmarine. The worst case loading conditions taking into account the full combination of loadingfactors shall be applied to the structural elements.

7.2.1.5 In the case of an existing design, the calculation shall include the original design and highlight thechanges to the parent hull structure with the impact of the highlighted change.

7.2.1.6 Separate calculations shall be provided for masts and periscopes to demonstrate that thestructural design with regards to strength, stiffness and vibration avoidance of resonantfrequencies fully meets the design requirements.

7.2.1.7 Separate calculations shall be provided to demonstrate that frequencies of hull vibration are inavoidance of the resonant frequencies of major sources like shaft and propeller.

7.2.1.8 A report on the performance of hull against underwater shock and a report on post damageResidual Strength Assessment (RSA).

7.2.2 Design Data

7.2.2.1 The structural report shall be supported by the following set of DAR approved design data:

7.2.2.2 Source and data for environmental and military loading.

7.2.2.3 Calculations for fatigue, local strength and buckling of primary and secondary structure andfoundations for major equipment.

7.2.2.4 Finite Element model determine with a level of detail and accuracy acceptable to the DAR

7.2.2.5 Finite Element Analysis input and output data

7.2.2.6 Acceptable stress and deformation limits


25/27

UNCLASSIFIED


23

UNCLASSIFIED


7.2.2.7 Material selection and supporting test results

7.2.2.8 Circularity measurement method and results

7.2.2.9 Design and manufacturing tolerances for primary and secondary structure.

7.2.2.10 Calculations supporting acceptability of loads applied during docking.

7.2.2.11 Weld plans (showing locations of welds)

7.2.2.12 Collision Safety Assessment covering survivability of the pressure hull and ballast tank structuresin the event of a collision. Should also cover the consequences of a exercise torpedo collidingwith the hull.

7.2.3 Drawings:

7.2.3.1 The following DAR approved structural drawings shall be provided:

7.2.3.1.1 General Arrangement;

7.2.3.1.2 Midship Section;

7.2.3.1.3 Profile and Decks;

7.2.3.1.4 Shell Expansion;

7.2.3.1.5 Watertight Bulkheads;

7.2.3.1.6 Deep and Ring Frames;

7.2.3.1.7 Longitudinal Section;

7.2.3.1.8 Pillars and Girders;

7.2.3.1.9 i). Fore end construction;

7.2.3.1.10 j). Aft end construction;

7.2.3.1.11 Machinery Seating;

7.2.3.1.12 Conning tower structure

7.2.3.1.13 Escape tower and rescue seat structures

7.2.3.1.14 Casing and Support Structure;

7.2.3.1.15 Fin and Mast Support Structure;

7.2.3.1.16 Rudders and supporting structure;

7.2.3.1.17 Propeller support structure;

7.2.3.1.18 Sonar Dome and Appendages;

7.2.3.1.19 Drawings as noted in the ILS Certification Matrix; and

7.2.3.1.20 Any other drawings required by the TRA.

7.2.3.2 The purpose of these drawings is to assist the evaluation of the principal characteristics of thestructural design. The drawings shall be approved by the DAR and will form one of the basedocuments of the construction contract.

7.2.3.3 All drawings shall show full details of material thickness, welding detail etc. Cross-references andrevisions to relevant drawings shall be clear and concise.

7.2.3.4 All additions and changes to major structural elements such as frames and watertight bulkheadsdetailing all connection methods, structural pillars etc and impact on existing design structure shallbe highlighted.

7.2.3.5 A full 3d CAD model of the submarine iaw DEF(AUST) 5000 Vol 2 Part 28 Ship ElectronicProduct Modelling.


26/27

UNCLASSIFIED


24

UNCLASSIFIED


7.3 Pre Contract Deliverables

7.3.1 A design disclosure document on the structural design shall be provided to establish the credibility ofthe designer to provide a quality design that complies with proven submarine structural standardsand methodologies.

7.3.2 This design disclosure shall provide the preliminary calculations of the proposed structure usingpressure and shock loads at DDD and CD. This shall include the design philosophy and applicationof the safety factors proposed and their traceability to the standards and requirements.

7.3.3 The designer shall provide evidence where their design philosophy has been applied to similarsubmarine design that has been accepted, and design validation data from trials.

7.4 During Contract Deliverables

7.4.1 In the detailed design/construction phase, further details of data, calculations and drawings capturingall the up-to-date information of the capability shall be provided.

7.4.2 There shall be a gradual delivery of structural reports as they are completed.

7.5 Contract Deliverables

7.5.1 The final structural calculation report(s) together with complete set of approved as fitted structuraldrawings shall be provided.

7.6 Manufacture

7.6.1 Where as built measurements show the design tolerances have been exceeded a re-assessment ofthe relevant calculations shall be undertaken and submitted to the DAR.

7.6.2 For each submarine a report documenting the dimensional tolerances of the submarine structureachieved during build and highlighting any deviations from design tolerances.

7.7 Test Regime

7.7.1 Tank ti ghtness test

7.7.1.1 Prior to submergence tests, boundaries of tanks shall be tested with seawater.

7.7.1.2 Tightness tests are performed by applying water pressure equivalent to the specified design headof the structure.

7.7.1.3 Tightness tests shall not be performed until structural work, including any structural attachmentswhich might affect the tightness of the structure, is complete. Permanent access fittings andclosures shall have been installed.

7.7.2 Vacuum test

7.7.2.1 A vacuum test of the whole submarine and of all compartments and bulkheads which may besubjected to DDD or CD pressure shall be conducted to prove boundary integrity in way ofhatches and penetrations prior to any dived tests.

7.7.3 First of Class tests

7.7.3.1 A test plan shall be produced to conduct strain gauging of the hull of the First of Class during itsfirst dive to DDD. A report shall be produced comparing the results obtained with those predictedand highlighting any significant variations.

7.7.3.2 A test plan shall be produced for monitoring accelerations and strains of the pressure hull duringFirst of Class Shock Trials.

7.8 Maintenance/Hull Survey


27/27

UNCLASSIFIED


25

UNCLASSIFIED

7.8.1 To ensure maintenance of adequate through life strength, an ongoing Survey program shall beundertaken iaw DEF(AUST) 5000 Vol9 Pt 02 Submarine Hull Survey.

7.8.2 Circularity measurements of pressure hull plating shall be taken, both at build and following structural

modifications, throughout those portions of the pressure hull and pressure hull appendages that areintended to be circular.

7.8.3 The designed survey program shall be consistent with UUC requirements and shall detail acceptablein-service and through life corrosion limits, survey of high stress welds and structure and metal lossrepair procedures.

Vol09 Pt01 Issue 01 Submarine Structures

Documents

Transcript of Vol09 Pt01 Issue 01 Submarine Structures