nes 168 requirements for polyvinyl chloride (pvc) coated lead ballast blocks category 3

Ministry of Defence Defence Standard 02-168 (NES 168)

Issue 1 Publication Date 01 April 2000

Incorporating NES 168 Category 3

Issue 2 Publication Date July 1990

Requirements ForPolyvinyl Chloride (PVC) Coated

Lead Ballast Blocks

DStanDStan is now the publishing authority for all Maritime Standards (formerly NESs). Any reference to any other publishing authority throughout this standard should be ignored.Any queries regarding this or any other Defence Standard should be referred to the DStan Helpdesk as detailed at the back of this document.

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) 168 Issue 2 dated July 1990.

Ministry of Defence

Naval Engineering Standard

NES 168 Issue 2 July 1990(Reformatted)

REQUIREMENTS FOR POLYVINYL CHLORIDE (PVC) COATED LEADBALLAST BLOCKS

This NES Supersedes

NES 168 ISSUE 1DG SHIPS 1001

Record of Amendments

AMDT INSERTED BY DATE

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iNAVAL ENGINEERING STANDARD 168

ISSUE 2 (REFORMATTED)

REQUIREMENTS FOR POLYVINIL CHLORIDE (PVC) COATED LED BALLAST

BLOCKS

The issue and use of this Standard

is authorized for use in MOD contracts

by MOD(PE) Sea Systems and

the Naval Support Command

ECROWN COPYRIGHT

Published by:

Director of Naval ArchitectureProcurement Executive, Ministry of DefenceFoxhill, Bath BA1 5AB

NES 168Issue 2 (Reformatted)

iii

SCOPE

1. This NES details the requirements for Polyvinyl Chloride (PVC) coated lead blocks.


iv


v

FOREWORD

Sponsorship

1. ThisNaval Engineering Standard (NES) is sponsored by theProcurement Executive, Ministryof Defence, Sea Systems.

2. It is to be applied as required by anyMinistry of Defence, contract for polyvinyl chloride (PVC)coated lead block.

3. If it is found to be unsuitable for any particular requirement the MOD(PE) is to be informedin writing of 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 MOD and those directly applicable to a particular contract are to be dealt withusing existing procedures or as specified in the contract.

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 or similarterms, means the Ministry of Defence in writing.

7. Any significant amendments that may be made to this NES at a later date will be indicatedby a vertical side line. Deletions will be indicated by 000 appearing at the end of the lineinterval.

8. Extracts from British Standards within this NES have been included with the permission ofthe British Standards Institution.

Conditions of Release

General

9. This Naval Engineering Standard (NES) has been prepared for the use of the Crown and ofits contractors in the execution of contracts for the Crown. The Crown hereby excludes allliability (other than liability for death or personal injury) whatsoever and howsoever arising(including but without limitation, negligence on the part of the Crown, its servants or agents)for any loss or damage however caused where the 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 published without written permissionof the MOD.

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

MOD Tender or Contract Process

12. ThisNES is the property of the Crown and unless otherwise authorized in writing by theMODmust be returned on completion of the contract, or submission of the tender, in connectionwith which it is issued.

13. When this NES 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,


vi

relevant to each particular tender or contract. Enquiries in this connection may be made ofthe local MOD(PE) Quality Assurance Representative or the Authority named in the tenderor contract.

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

Related Documents

15. In the tender and procurement processes the related documents listed in each section andAnnex A can be obtained as follows:

a British Standards British Standards Institution389 Chiswick High Road,London W4 4AL

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

c Naval Engineering Standards CSE3a, CSE Llangennech, Llannelli,Dyfed SA 14 8YP

d Other documents Tender or Contract Sponsor to advise.

Note: Tender or Contract Sponsor can advise in cases of difficulty.

16. 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.

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

Health and Safety

Warning

18. ThisNESmay call for the use of processes, substances and/or procedures thatmay be injuriousto health if adequate precautions are not taken. It refers only to technical suitability and inno way absolves either the supplier or the user from statutory obligations relating to healthand safety at any stage of manufacture or use. Where attention is drawn to hazards, thosequoted may not necessarily be exhaustive.


vii

CONTENTSPage No

TITLE PAGE i. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TITLE i. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SCOPE iii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

FOREWORD v. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Sponsorship v. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Conditions of Release v. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

General v. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .MOD Tender or Contract Process v. . . . . . . . . . . . . . . . . . . . . . . . . .

Related Documents vi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Health and Safety vi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Warning vi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CONTENTS vii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 1. MATERIALS 1.1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.1 Lead Ingots 1.1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.2 Bonding Agent 1.1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.3 PVC 1.1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 2. SAFETY PRECAUTIONS 2.1. . . . . . . . . . . . . . . . . . . .

SECTION 3. TYPICAL METHOD OF MANUFACTURE FORINFORMATION ONLY 3.1. . . . . . . . . . . . . . . . . . . . . . .

SECTION 4. ACCEPTANCE STANDARDS 4.1. . . . . . . . . . . . . . . . .

SECTION 5. TESTING 5.1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 6. QUALITY ASSURANCE DOCUMENTATION 6.1. . .

SECTION 7. PACKAGING AND IDENTIFICATION 7.1. . . . . . . . .

ANNEX A. ANNEX A A.1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

ALPHABETICAL INDEX


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1.1

1. MATERIALS

1.1 Lead Ingots

a. Lead ingots are to be to commercial standards or approved scrap.

1.2 Bonding Agent

a. Themanufacturer may use any bonding agent suitable for the adherence of PVCto lead.

1.3 PVC

a. The PVC is to be in a paste form and black in colour.


1.2


2.1

2. SAFETY PRECAUTIONS

a. In common with other metal finishing processes, some of the materialsemployed in this process are of a toxic nature and appropriate precautions aretherefore to be taken.


2.2


3.1

3. TYPICAL METHOD OF MANUFACTURE FOR INFORMATION ONLY

a. Molten lead is poured into metal chilling moulds until they are full. The lead isslowly cooled and all oxidation removed. When cool the blocks are removed fromthe mould and are pressed to round off all edges and corners.

b. In order to achieve a satisfactory bond between PVC and lead, a bonding agentis applied.

c. The lead blocks are then preheated prior to dipping in cold PVC paste.

d. After dipping the blocks are placed in an oven and further heated to enable thePVC to gel.

e. The completed blocks are cooled by immersion in water.

f. Any holes in the coating are filled with hot plasticized PVC.


3.2


4.1

4. ACCEPTANCE STANDARDS

a. The weight of the finished blocks are to bewithin 5% of the computed weight,taking lead to have a density of 11340 kg/m3 andPVC to have an average densityof 1200 kg/m3.

b. The dimensions are to be as stated in the Contract Documents. Tolerances areto be 3 mm on all linear dimensions.

c. The PVC coating is to be 2.5 mm minimum thickness and is to be free frompinholes, air pockets, cuts and deformities.

d. The PVC coating is to be bonded to the lead over a minimum of 75% of thesurface area of the block.


4.2


5.1

5. TESTING

a. The PVC coating is to be checked for uniformity, thickness and bond by takinga random sample of one block out of every batch and removing the coating. (Abatch is to comprise up to a maximum of one hundred blocks of the samedimensions, manufactured consecutively and during the same production run.)

b. Should a defective item be found another block is to be selected at random fromthe same batch and is also to have the coating removed. Should this also provedefective, the whole batch is to be declared defective and action to remove thefaulty coatings and to recoat is to be taken.


5.2


6.1

6. QUALITY ASSURANCE DOCUMENTATION

a. Quality Assurance Documentation giving the information as required byClauses 4.a. 4.b. and 4.c. is to be supplied to the Consignee with the items. Thisdocumentation is to be related unambiguously by a suitable reference to therelevant PVC coated lead ballast blocks to which it refers. A copy of eachdocument is to be supplied to the MOD Quality Assurance Representative.


6.2


7.1

7. PACKAGING AND IDENTIFICATION

a. The PVC coated lead ballast blocks are to be supplied palleted and strapped inunits of approximately 1000 kg (unless specified otherwise by the Purchaser).Blocks from different batches are not to be supplied on the same pallet.

b. Except where otherwise stated in the Contract Documents, packaging is to bein accordance with the Contractors normal trade standards.

c. The following identification details are to be included ona label attached to eachpallet or container in such a manner that it will not become accidentallydetached:

(1) NATO Stock Number as stated in the Contract Documents.

(2) Batch Number.

(3) Description.

(4) Quantity.

(5) Contract Number.


7.2


A.1 ANNEX A.

ANNEX A.

A. RELATED DOCUMENTS

a. There are no Related Documents for this NES.


A.2ANNEX A.


B.1 ANNEX B.

ANNEX B.

B. DEFINITIONS AND ABBREVIATIONS

a. There are no Definitions and Abbreviations for this NES.


B.2ANNEX B.


INDEXINDEX.1

ALPHABETICAL INDEX

AAgent bonding, 3.1

Agent,bonding, 1.1

BBatches, 5.1

Bonding agent, 1.1, 3.1

CChilling mould, 3.1

Coating, 4.1, 5.1

Cooling, 3.1

DDefects in the block, 5.1

Dimensions of the blocks, 4.1

Dipping of the blocks, 3.1

Documentation, 6.1

Hheating, 3.1

Holes in the coating, 3.1

IIngots, lead, 1.1

LLabelling, 7.1

Lead blocks, 3.1

Lead ingots, 1.1

MMaterials, 1.1

Molten lead, 3.1

Moulds, 3.1

OOven heating, 3.1


INDEX INDEX.2

PPackaging, 7.1

Pre heating, 3.1

Precautions, 2.1

PVC paste black, 3.1

PVC paste,black, 1.1

QQuality Assurance, 6.1

SSafety Precautions, 2.1

Samples, 5.1

TTesting of coating, 5.1

Thickness of coating, 4.1

thickness of the blocks, 4.1

Toxicity, 2.1

WWeight of the blocks, 4.1, 7.1

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 [email protected]

File Reference

The DStan file reference relating to work on this standard is D/DStan/69/02/168.

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.

CONTENTSTITLE PAGESCOPEFOREWORDSponsorshipConditions of ReleaseGeneralMOD Tender or Contract Process

Related DocumentsHealth and SafetyWarning

1. MATERIALS1.1 Lead Ingots1.2 Bonding Agent1.3 PVC

2. SAFETY PRECAUTIONS3. TYPICAL METHOD OF MANUFACTURE4. ACCEPTANCE STANDARDS5. TESTING6. QUALITY ASSURANCE DOCUMENTATION7. PACKAGING AND IDENTIFICATIONANNEX A. RELATED DOCUMENTSANNEX B. DEFINITIONS AND ABBREVIATIONSALPHABETICAL INDEX