Ministry of Defence Defence Standard 02-779 (NES 779)

Issue 1 Publication Date 01 April 2000

Incorporating NES 779 Category 2

Issue 3 Publication Date September 1999

Requirements For 90/10 CopperNickel Alloy Material

Part 1Sheet, Strip And Plate

AMENDMENT RECORD

Amd No Date Text Affected Signature and Date

REVISION NOTE

This standard is raised to Issue 1 to update its content.

HISTORICAL RECORD

This standard supersedes the following:

Naval Engineering Standard (NES) 779 Part 1 Issue 3 dated September 1999.

Ministry of Defence

Naval Engineering Standard

CATEGORY 2

NES 779 Part 1 Issue 3 September 1999

REQUIREMENTS FOR 90/10 COPPER NICKEL ALLOY MATERIAL

PART 1

SHEET, STRIP AND PLATE

CROWN COPYRIGHT 1999

This NES Supersedes

NES 779 part 1 Issue 2

Record of Amendments

AMDT INSERTED BY DATE

1

2

3

4

5

(i)

NAVAL ENGINEERING STANDARD 779

REQUIREMENTS FOR 90/10 COPPER NICKEL ALLOY MATERIAL

PART 1 ISSUE 3 SEPTEMBER 1999

SHEET, STRIP AND PLATE

This Naval Engineering Standard

is authorized for use in MOD contracts

by the Defence Procurement Agency

and the Defence Logistics Organisation

Published by:

Sea Technology GroupDefence Procurement AgencyNA145Ash 0, #95MOD Abbey WoodBristol BS34 8JH

NES 779 Part 1Issue 3September 1999

(ii)

NES 779 PART 1Issue 2

Unauthorized Version

(iii)

SCOPE

1. This NES specifies the requirements for the production, inspection and testing of 90/10Copper Nickel Alloy sheet, strip and plate.

NES 779 PART 1 Issue 2Unauthorized Version

(iv)

NES 779 Part 1Issue 3

April 1999

(v)

FOREWORDSponsorship

1. This Naval Engineering Standard (NES) is sponsored by the Defence Procurement Agency(DPA), Ministry of Defence (MOD).

2. The complete NES 779 comprises:

Requirements for 90/10 Copper Nickel Alloy Material

Part 1 Sheet, Strip and Plate

Part 2 Forgings, Forging Stock, Rods and Sections

Part 3 Tubes

3. If it is found to be unsuitable for any particular requirement MOD is to be informed inwritingof the circumstances.

4. Any user of this NES either within MOD or in industry may propose an amendment to it.Proposals for amendments that are not directly applicable to a particular contract are to bemade to the publishing authority identified on Page (i), and those directly applicable to aparticular contract are to be dealt with using contract procedures.

5. No alteration is to be made to this NES except by the issue of an authorized amendment.6. Unless otherwise stated, reference in this NES to approval, approved, authorized and similar

terms, means by the MOD in writing.7. Any significant amendments that may be made to this NES at a later date will be indicated

by a vertical sideline. Deletions will be indicated by 000 appearing at the end of the lineinterval.

8. This NES has been reissued because of technical update and restructuring.

Conditions of ReleaseGeneral

9. This Naval Engineering Standard (NES) has been devised solely for the use of the MOD, andits contractors in the execution of contracts for the MOD. To the extent permitted by law, theMOD hereby excludes all liability whatsoever and howsoever arising (including but withoutlimitation, libability resulting from negligence) for any loss or damage however caused whenthe NES is used for any other purpose.

10. This document is Crown Copyright and the information herein may be subject to Crown orthird party rights. It is not to be released, reproduced or publishedwithout written permissionof the MOD

11. The Crown reserves the right to amend or modify the contents of thisNES without consultingor informing any holder.

MOD Tender or Contract Process12. This NES is the property of the Crown. Unless otherwise authorized in writing by the MOD

must be returned on completion of the contract, or submission of the tender, in connectionwith which it is issued.

13. When thisNES is used in connection with aMOD tender or contract, the user is to ensure thathe is in possession of the appropriate version of each document, including related documents,relevant to each particular tender or contract. Enquiries in this connection may be made tothe authority named in the tender or contract.

14. When NES are incorporated into MOD contracts, users are responsible for their correctapplication and for complying with contractual and other statutory requirements.Compliance with an NES does not of itself confer immunity from legal obligations.

NES 779 Part 1Issue 3April 1999

(vi)

Categories of NES15. The Category of this NES has been determined using the following criteria:

a. Category 1. If not applied may have a Critical affect on the following:

Safety of the vessel, its complement or third parties.

Operational performance of the vessel, its systems or equipment.

b. Category 2. If not applied may have a Significant affect on the following:

Safety of the vessel, its complement or third parties.

Operational performance of the vessel, its systems or equipment.

Through life costs and support.

c. Category 3. If not applied may have a Minor affect on the following:

MOD best practice and fleet commonality.

Corporate experience and knowledge.

Current support practice.

Related Documents16. In the tender and procurement processes the related documents listed in each section and

Annex A can be obtained as follows:

a. British Standards British Standards Institution,389 Chiswick High Road,London, W4 4AL

b. Defence Standards Directorate of Standardization, Stan 1,Kentigern House, 65 Brown Street,Glasgow, G2 8EX.

c. Naval Engineering Standards CSE3a, CSE Llangennech, Llanelli, Dyfed,SA14 8YP.

d. Other documents Tender or Contract Sponsor to advise.

17. All applications to Ministry Establishments for related documents are to quote the relevantMOD Invitation to Tender or Contract number and date, together with the sponsoringDirectorate and the Tender or Contract Sponsor.

18. Prime Contractors are responsible for supplying their subcontractors with relevantdocumentation, including specifications, standards and drawings.

Health and Safety

Warning19. This NES may call for the use of processes, substances and/or procedures that may be

injurious to health if adequate precautions are not taken. It refers only to technical suitabilityand in no way absolves either the supplier or the user from statutory obligations relating tohealth and safety at any stage of manufacture or use. Where attention is drawn to hazards,those quoted may not necessarily be exhaustive.

20. This NES has been written and is to be used taking into account the policy stipulated in JSP430: MOD Ship Safety Management System Handbook.

Additional Information(There is no relevant information)

NES 779 Part 1Issue 3

April 1999

(vii)

CONTENTSPage No

TITLE PAGE (i). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SCOPE (iii). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

FOREWORD (v). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Sponsorship (v). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Conditions of Release (v). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Categories of NES (vi). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Related Documents (vi). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Health and Safety (vi). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CONTENTS (vii). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 1. PERFORMANCE SPECIFICATION 1.1. . . . . . . . . . .1.1 Physical Characteristics 1.1. . . . . . . . . . . . . . . . . . . . . . .Table 1.1 Restrictions on Composition 1.1. . . . . . . . . . . . . . . . . . .1.2 Hardness 1.1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.3 Manufacture 1.1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.3.1 Heat Treatment 1.2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.3.2 Surface Condition 1.2. . . . . . . . . . . . . . . . . . . . . . . . . . . .1.4 Dimensions and Tolerances 1.2. . . . . . . . . . . . . . . . . . . .1.4.1 Dimensions 1.2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.4.2 Tolerances 1.2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Table 1.2 Flatness Tolerances 1.2. . . . . . . . . . . . . . . . . . . . . . . . . . .1.5 Test Methods 1.2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.5.1 Destructive Tests 1.2. . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.5.1.1 Analysis 1.2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.5.1.2 Hardness Tests 1.3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.5.1.3 Re-tests 1.3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.5.2 Non-destructive Tests 1.3. . . . . . . . . . . . . . . . . . . . . . . . .1.5.2.1 Dimensional 1.3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.5.2.2 Flatness 1.3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.5.2.3 Visual-Optical 1.3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.5.2.4 Liquid Penetrant 1.3. . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 2. NATIONAL/INTERNATIONAL REGULATIONS 2.1

SECTION 3. MILITARY STANDARDS/REQUIREMENTS 3.1. . . .3.1 Acceptance Standards 3.1. . . . . . . . . . . . . . . . . . . . . . . .3.1.1 Destructive Tests 3.1. . . . . . . . . . . . . . . . . . . . . . . . . . . . .3.1.1.1 Analysis 3.1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3.1.1.2 Hardness 3.1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3.1.1.3 Re-tests 3.1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3.1.2 Non-destructive 3.1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3.1.2.1 Visual 3.1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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3.1.2.2 Liquid Penetrant 3.1. . . . . . . . . . . . . . . . . . . . . . . . . . . .3.2 Quality Assurance Documentation 3.1. . . . . . . . . . . . . .3.3 Identification 3.1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3.4 Packaging 3.2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 4. DESIGN REQUIREMENTS/GUIDANCE 4.1. . . . . . .

SECTION 5. CORPORATE EXPERIENCE & KNOWLEDGE 5.1.

ANNEX A. RELATED DOCUMENTS A.1. . . . . . . . . . . . . . . . . . . .

ANNEX B. DEFINITIONS B.1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ANNEX C. PROCUREMENT CHECK LIST C.1. . . . . . . . . . . . . . .

ALPHABETICAL INDEX INDEX.1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

NES 779 Part 1Issue 3April 1999

1.1

1. PERFORMANCE SPECIFICATION

Related Documents:BS EN ISO 6507−1, BS EN 1652, NES 729 Part 4, see alsoAnnex A.

1.1 Physical Characteristics

a. The material, as cast, is to conform to the chemical composition of BS EN 1652CW 352H. In addition it must meet the requirements of Table 1.1. Followingacceptance of the analysis from the cast melt no further additions arepermitted.

Element Not More than % W/W

Aluminium 0.03

Boron 0.02

Bismuth 0.002

Phosphorus 0.01

Silicon 0.05

Other 0.1

Table 1.1 Restrictions on Composition

b. The density of this material at 20° C is 8940kg m−3.

c. Where such material is required for use in welded construction, a sample is tobe taken from the edge of the plate at right angles to the direction of final rollingand a check analysis is to be made to show that no segregation or lack ofhomogeneity has occurred. The check will only be required where specified inthe Tender or Contract Documents.

1.2 Hardness

a. The hardness must not exceed 90 HV.

1.3 Manufacture

a. The sheet, strip and plate are to be produced by hot or cold rolling withsubsequent annealing. For flat products subsequent rolling may be necessaryto achieve flatness tolerances.

1.3.1 Heat Treatment

a. Since the copper nickels are susceptible to metallurgical damage by excessiveoxidation or sulphur contamination, extreme care is to be exercised over allheating operations carried out during the production process. Where it isnecessary to use oil or gas fired furnaces, strict control is to be exercised overthe furnace atmosphere and soaking time. The sulphur content in any fuel usedfor heat treatment is not to exceed:

(1) Gas: 0.7g/m3

(2) Oil: 0.5% by weight

Direct flame impingement is to be avoided.

b. The furnace charge is to be supported on clean firebricks or metal skids, andcare is to be taken during furnace charging and discharging operations to avoidcontact between the charge and the furnace walls.

NES 779 Part 1Issue 3April 1999

1.2

c. All traces of oil, grease or any other source of sulphur contamination are to beremoved prior to any heat treatment.

d. The maximum furnace temperature for heating stock is 1060° C.

1.3.2 Surface Condition

a. Surface defects may be removed by grinding or machining providing that thematerial remaining is not below the allowable thickness tolerance. Dressedareas are to be faired smoothly into the surrounding material and the bottomradius of the dressed area is to be at least 3 times the depth of the defect. Surfaceimperfections such as handling marks, straightening marks, roll marks andscale pattern are not to be considered as injurious provided that they do notreduce the thickness below the specified tolerance.

1.4 Dimensions and Tolerances

1.4.1 Dimensions

a. The sheet, strip and plate are to be manufactured to the dimensions stated inthe Contract. Edges of plate, sheet and strip are to be left in a condition thatwill not cause injury to personnel when handling them.

1.4.2 Tolerances

a. Except where special requirements are stated in the Contract, dimensionaltolerances specified in BS EN 1652, are to apply.

b. The flatness of individual plates when required for heat exchanger andcondenser tube plates is to be within the tolerances given in Table 1.2.

Depth of Arc not to Exceed (mm) for Lengths Shown

Under 1000mm 1000 to 1500mm Over 1500mm

1.5mm 2.0mm 3.0mm

Table 1.2 Flatness Tolerances

1.5 Test Methods

1.5.1 Destructive Tests

1.5.1.1 Analysis

a. A full analysis is to be made from a sample taken from each cast and from eachbatch of the ‘As Supplied’ sheet, strip or plate.

1.5.1.2 Hardness tests

a. Samples for test are to be prepared as specified in BS EN 1652, and tested inaccordance with BS EN ISO 6507−1, except when otherwise stated in thecontract.

b. The test samples are to be in the annealed condition and must not bemechanically worked (other than beingmachined to the shape of the test piece)before being tested.

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1.3

1.5.1.3 Re-tests

a. Should any of the original test specimens fail to meet the test requirementsdetailed in thisNES, two further samples from the same batch are to be selectedfor testing. One sample is to be taken from material immediately adjacent towhere the original test sample was taken, unless that sheet, strip or plate hasbeen withdrawn by the supplier.

1.5.2 Non-destructive Tests

1.5.2.1 Dimensional

a. All material is to be dimensionally checked against the Contract Documents.

1.5.2.2 Flatness

a. Inspection for flatness is only required for heat exchanger and condenser tubeplates and is to bemade by placing the plate on a flat-surface table and applyinga straight-edge and measuring the depth of arc between the straight-edge andthe plate.

1.5.2.3 Visual-Optical

a. All surfaces and edges of finished material are to be visually inspected, assistedwhere necessary by the use of x 5 magnification optics. All imperfections are tobe identified on the material and recorded on the QA documentation.

1.5.2.4 Liquid Penetrant

a. In cases of doubt, the visual examination is to be supplemented by liquidpenetrant testing to NES 729 Part 4 to show the plate to be free from surfaceflaws, cracks, laminations or other defects which will prove detrimental in thefurther use of the plate.

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1.4

NES 779 Part 1Issue 3April 1999

2.1

2. NATIONAL/INTERNATIONAL REGULATIONS

(No relevant information included)

NES 779 Part 1Issue 3April 1999

2.2

NES 779 Part 1Issue 3April 1999

3.1

3. MILITARY STANDARDS/REQUIREMENTS

3.1 Acceptance Standards

3.1.1 Destructive Tests

3.1.1.1 Analysis

a. The analysis is to conform with Clause 1.1a.

3.1.1.2 Hardness

a. The hardness values of the test pieces are to conform with Clause 1.2.

3.1.1.3 Re-tests

a. Both of the re-tested samples are to conform to Clause 1.2 of this NES. Shouldany of the re-tests fail, the batch represented by the test pieces does not meetthe requirements of this NES and is to be rejected.

3.1.2 Non-destructive

3.1.2.1 Visual

a. Each sheet, strip or plate is to be smooth and free from surface defects. Dressedareas are to be seen to be faired smoothly into the surrounding material.

3.1.2.2 Liquid Penetrant

a. All sheet, strip and plate are to be free from surface flaws, cracks, laminationor other defects which will prove detrimental.

3.2 Quality Assurance Documentation

a. Each consignment of sheet, strip or plate is to be accompanied by QualityAssurance Documentation containing a record of all the measured results fromthe tests required by Clauses 1.5.1.1a.−1.5.1.3a. together with a Certificate ofConformity which refers to the acceptance standards detailed inClause 3.1. TheCertificate of Conformity is to carry a reference number or sufficient otherinformation to positively relate the certificate with the relevant sheet, strip orplate.

b. Records sufficient to prove adequate quality control, full material traceabilityand the relevant results of analyses and tests are to be retained by theContractor for at least 5 years after delivery.

3.3 Identification

a. Unless otherwise stated in the Contract Documents, all sheet, strip and plateis to be identified by the manufacturer by printing directly on to one surface ofthe material using an ink, which will not have a deleterious effect on thematerial. The markings are to be not less than 5mm high and are to run alongthe entire length of the material, the maximum distance between markings isnot to exceed 300mm. The markings are to be positioned centrally for strip andnot less than 150mm in from the edge of sheet or plate. Markings are to be asfollows:

(1) 90/10 Cu/Ni, NES 779 part 1.

(2) Contract number.

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3.2

(3) Ship numbers, manufacturer’s name, dimensions of sheet, strip or plateor additional markings as may be required by the Contract Documents.

(4) Unique number to positively identify the material to its QualityAssurance Documentation.

(5) NATO Stock Number

b. The requirements of Clause 3.3a.(2)−(5) may be applied by securely attachinga label to the material.

c. Where the material width exceeds 1000mm the information at Clause 3.3a. isto be repeated on the same face 150mm in from each side and run along theentire length of the material.

3.4 Packaging

a. Except where otherwise stated in the Contract Documents, all sheet, strip orplate is to be packaged in accordance with the manufacturer’s normal tradepractice and to ensure that no damage occurs during transit.

b. Each package is to carry a labelmarked with the following identification details:

(1) NATO Stock Number when applicable

(2) Description

(3) Quantity

(4) Contract Number

NES 779 Part 1Issue 3April 1999

4.1

4. DESIGN REQUIREMENTS/GUIDANCE

(No relevant information included)

NES 779 Part 1Issue 3April 1999

4.2

NES 779 Part 1Issue 3April 1999

5.1

5. CORPORATE EXPERIENCE & KNOWLEDGE

(No relevant information included)

NES 779 Part 1Issue 3April 1999

5.2

NES 779 Part 1Issue 3April 1999

ANNEX AA.1

ANNEX A.

RELATED DOCUMENTS

A.1. The following documents and publications are referred to in this NES:

BS EN ISO 6507−1 Metallic materials Vickers hardness test: Test method

BS EN 1652 Copper and copper alloys − Plate, strip, sheet, circles forgeneral purposes

JSP 430 Ship Safety Management System HandbookVol 1: Policy and Guidance on MOD Ship and EquipmentSafety Management

NES 729 Requirements for Non-Destructive Examination Methods

Part 4 Liquid Penetrant

NES 779 Part 1Issue 3April 1999

ANNEX A A.2

NES 779 Part 1Issue 3April 1999

ANNEX BB.1

ANNEX B.

DEFINITIONS

B.1. For the purpose of this NES the following definitions apply:

Acceptance Authority This is as specified in the tender, contractdocument or order. Where this is not known,enquiries are to be directed to DPA, NA145.

Batch Sheet, plate or strip of the same dimensions,produced by the same process from the samecast.

Cast A cast is:

a. the product of one furnace melt, or

b. the product of one crucible melt, or

c. the product of a number of furnace orcrucible melts where such are aggregatedand mixed prior to sampling, or

d. in continuous casting, 250kg or fractionthereof of metal poured, and

e. when a heat treatment is required theproduct of one furnace heat treatmentload.

Certificate of Conformity A certificate requested by the purchaser andissued on the basis of tests carried out on themanufacturing batch from which the materialsupplied has been taken.

Plate Flat rolled product of rectangular cross−sectionwith uniform thickness greater than 10 mm

Sheet Flat rolled product of rectangular cross−sectionwith uniform thickness from 0.2 mm up to andincluding 10 mm, supplied in straight lengths,usually with sheared or sawn edges. Thethickness does not exceed one tenth of thewidth.

Strip Flat rolled product of rectangular cross−sectionwith uniform thickness from 0.1 mm up to andincluding 5 mm, manufactured in coil andsupplied as sheared coils, transverse woundcoils or cut to length, usually with slit edges.The thickness does not exceed one tenth of thewidth.

NES 779 Part 1Issue 3April 1999

ANNEX B B.2

NES 779 Part 1Issue 3April 1999

ANNEX CC.1

ANNEX C.

PROCUREMENT CHECK LIST

Notes:C.1 This Check List is to ensure that certain aspects of this Naval Engineering

Standard are consulted when preparing a procurement specification for aparticular applicationparticular application.

C.2 Clauses where a preference for an option is to be used or where specific data isto be added are included in the Check List.

C.3 Each item is to be marked either:

! = includedNA = not applicable

CHECKNo CHECK CLAUSE No ! or NA

1 Segregation—homogeneity check 1.1c.

2 Dimensions of sheet, strip or plate 1.4.1

3 Dimensional tolerances 1.4.2a

4 Flatness tolerance 1.4.2b.

5 Alternative hardness test programme 1.5.1.2a.

6 Identification requirements 3.3

7 Packaging requirements 3.4

NES 779 Part 1Issue 3April 1999

ANNEX C C.2

NES 779 Part 1Issue 3April 1999

ANNEX CINDEX.1

ALPHABETICAL INDEX(Note: page numbers are given)

CCertificate of conformity, 3.1

Chemical composition, 1.1

Contract, 1.1, 1.2, 1.3, 3.1, 3.2

MMagnification optics, 1.3

Markings, 3.1, 3.2

SSurface defects, 3.1

Surface imperfectons, 1.2

TTest piece, 1.3, 3.1

Test sample, 1.3

UUnique number, 3.2

WWelded construction, 1.1

NES 779 Part 1Issue 3April 1999

ANNEX C INDEX.2

Inside Rear Cover

© Crown Copyright 2000

Copying Only as Agreed with DStan

Defence Standards are Published by and Obtainable from:

Defence Procurement AgencyAn Executive Agency of The Ministry of Defence

Directorate of StandardizationKentigern House65 Brown Street

GLASGOW G2 8EX

DStan Helpdesk

Tel 0141 224 2531/2 Fax 0141 224 2503

Internet e-mail enquiries@dstan.mod.uk

File Reference

The DStan file reference relating to work on this standard is D/DStan/69/02/779.

Contract Requirements

When Defence Standards are incorporated into contracts users are responsible for their correctapplication and for complying with contractual and statutory requirements. Compliance witha Defence Standard does not in itself confer immunity from legal obligations.

Revision of Defence Standards

Defence Standards are revised as necessary by up issue or amendment. It is important thatusers of Defence Standards should ascertain that they are in possession of the latest issue oramendment. Information on all Defence Standards is contained in Def Stan 00-00 Standardsfor Defence Part 3 , Index of Standards for Defence Procurement Section 4 ‘Index of DefenceStandards and Defence Specifications’ published annually and supplemented regularly byStandards in Defence News (SID News). Any person who, when making use of a DefenceStandard encounters an inaccuracy or ambiguity is requested to notify the Directorate ofStandardization (DStan) without delay in order that the matter may be investigated andappropriate action taken.