nes 170 requirements for epdm rubber circular and 'd' section marine fenders category 3

Ministry of Defence Defence Standard 02-170 (NES 170)

Issue 1 Publication Date 01 April 2000

Incorporating NES 170 Category 3

Issue 1 Publication Date May 1993

Requirements For EPDMRubber Circular And 'D' Section

Marine Fenders

DStan

DStan 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) 170 Issue 1 dated May 1993.

Ministry of Defence

Naval Engineering Standard

NES 170 Issue 1 (Reformatted) May 1993

REQUIREMENTS FOR EPDM RUBBER CIRCULAR AND‘D’ SECTION MARINE FENDERS

This NES Supersedes

Record of Amendments

AMDT INSERTED BY DATE

1

2

3

4

5

6

7

8

9

10

i

NAVAL ENGINEERING STANDARD 170

ISSUE 1 (REFORMATTED)

REQUIREMENTS FOR EPDM RUBBER CIRCULAR

AND ‘D’ SECTION MARINE FENDERS

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 170Issue 1 (Reformatted)

iii

SCOPE

1. This NES relates to the requirements for a terpolymer made from ethylenepropylene dienemonomer (EPDM) to beused for circular and ‘D’ shaped sectionrubber fenders to be fitted to the structure of HM Surface Ships.


iv


v

FOREWORD

Sponsorship

1. ThisNaval Engineering Standard (NES) is sponsored by theProcurement Executive, Ministryof Defence, Director Naval Architecture DNA, Section NA 114.

2. If it is found to be technically unsuitable for any particular requirement the Sponsor is to beinformed inwriting of the circumstances, with a copy to theDirector Naval Architecture DNA,Section NA 145.

3. 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 Sponsor of the NES and those directly applicable to a particular contract are tobe dealt with using existing procedures or as specified in the contract.

4. No alteration is to be made to this NES except by the issue of an authorized amendment.

5. Unless otherwise stated, reference in this NES to approval, approved, authorized or similarterms, means by the Ministry of Defence in writing.

6. 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.

Conditions of Release

General

7. 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.

8. 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.

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

MOD Tender or Contract Process

10. 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.

11. 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,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.

12. 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.


vi

Related Documents

13. 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 Institution,389 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, Llanelli,Dyfed SA14 8YP

d. Other documents Tender or Contract Sponsor to advise.

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

14. 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.

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

Health and Safety

Warning

16. 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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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. TYPE APPROVAL 1.1. . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 2. COMPOSITION 2.1. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 3. PROCEDURES FOR MIXING AND CURINGEPDM RUBBER 3.1. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 4. TESTING 4.1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 5. FENDER SELECTION REQUIREMENTS 5.1. . . . . .

SECTION 6. IDENTIFICATION AND PACKAGING 6.1. . . . . . . . .

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

ANNEX B. DEFINITIONS AND ABBREVIATIONS B.1. . . . . . . .

ANNEX C. REQUIRED MECHANICAL PROPERTIES OFMATERIAL C.1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ANNEX D. CIRCULAR SECTION FENDERS WITHCIRCULAR INNER BORE D.1. . . . . . . . . . . . . . . . . . . .

D.1 YOUNG’S MODULUS, STIFFNESS ANDSTORAGE ENERGY REQUIREMENTS D.1. . . . . . . .

ANNEX E. CIRCULAR SECTION FENDERS WITHCIRCULAR INNER BORE E.1. . . . . . . . . . . . . . . . . . . .

E.1 YOUNG’S MODULUS, STIFFNESS ANDSTORAGE ENERGY REQUIREMENTS E.1. . . . . . . .

ANNEX F. CIRCULAR SECTION FENDERS WITHCIRCULAR INNER BORE F.1. . . . . . . . . . . . . . . . . . . .

F.1 YOUNG’S MODULUS, STIFFNESS ANDSTORAGE ENERGY REQUIREMENTS F.1. . . . . . . .

ANNEX G. ‘D’ SECTION FENDERS WITH ‘D’ SHAPEDINNER BORE G.1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

G.1 YOUNG’S MODULUS STIFFNESS ANDSTORAGE ENERGY REQUIREMENTS G.1. . . . . . . .


viii

ANNEX H. ‘D’ SECTION FENDERS WITH ‘D’ SHAPEDINNER BORE H.1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

H.1 YOUNG’S MODULUS, STIFFNESS ANDSTORAGE ENERGY REQUIREMENTS H.1. . . . . . . .

ANNEX I. ‘D’ SECTION FENDERS WITH ‘D’ SHAPEDINNER BORE I.1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

I.1 YOUNG’S MODULUS, STIFFNESS ANDSTORAGE ENERGY REQUIREMENTS I.1. . . . . . . .

ALPHABETICAL INDEX


1.1

1. TYPE APPROVAL

a. The Type Approval Authority for EPDM Rubber Circular and ‘D’ SectionDirector Marine Fenders is the Procurement Executive, Ministry of Defence,Director Naval Architecture, Section NA 114, Room 105, Block F, Foxhill, BathBA1 5AB.

b. No manufacturer may supply such fenders to the MOD(PE) until he hasobtained Type Approval for his product.

c. To obtain Type Approval the manufacturer is to:

(1) satisfy the Approval Authority that his product complies with therequirements of the NES;

(2) supply details of the chemical composition of the material to the ApprovalAuthority. All such disclosures will be treated asCommercial-in-Confidence;

(3) supply a metre length of the material he proposes to supply;

(4) supply results of tests undertaken in compliance with Section 4. andAnnexes C., D., E., F., G. and H. of this NES.

d. Once Type Approval has been granted no change may be made to thecomposition of the rubber mix nor any aspect of its production without priorapproval in writing of the Approval Authority.

e. If approval is given for a change in formulation the newly formulated materialis to be subjected to the type approval test.

f. Type Approval is only valid for 5 years from the date of approval. The ApprovalAuthority reserves the right to revoke the Type Approval at any time.

g. The manufacturer may apply for re-approval at any time.


1.2


2.1

2. COMPOSITION

a. The rubber compound is to be based wholly upon ethylene, propylene and1,4-hexadiene (EPDM), containing at least 1.5 parts by weight per hundredgrammes of rubber of an antioxidant.

b. The colour of the cured compound is to be black.


2.2


3.1

3. PROCEDURES FOR MIXING AND CURING EPDM RUBBER

a. Mixing and curing procedures are to be carried out in accordance with BS 1674and for the determination of the curing characteristics of the compound inaccordance with BS 1673 Part 10, the Monsanto Rheometer has been foundsuitable for this purpose.


3.2


4.1

4. TESTING

a. The quality control system requirements appropriate to this compound arethose specified in Def Stan 05−92 or equivalent. Each manufacturing batch isto be tested for hardness, tensile strength, elongation at break, compression setand accelerated air ageing by the methods given in Annex C. The tests forproperties described in Annex C. are to be carried out on test sheets preparedfrom each batch of compound as defined in Def Stan 93−31 Clauses 1−6inclusive.


4.2


5.1

5. FENDER SELECTION REQUIREMENTS

a. Fender selection will be decided initially by consideration of the type of vessel,nature of the berth, berthing velocity, berthing angle etc. The type, stiffness andstorage energy requirements can be defined using the procedures of BS 6349,Parts 1 and 4.

b. Types of Fenders to be used:

(1) Outer Circular Section shape with a circular inner bore. By usingthe parameters for circular section fenders as defined in Annexes D.,E.and F. stiffness and storage energy with varying deflection may bedetermined.

(2) Outer ‘D’ Section shape with ‘D’ shaped inner bore. With this typeof fender the outside diameter must be taken as the height of the outside‘D’ section. When the width and height of the inner ‘D’ bore arecomparable, selection ismade from the circular section fender data. In thecase of non-comparable dimension of the inner ‘D’ bore then the selectionshould be made from Annexes G., H. and I.


5.2


6.1

6. IDENTIFICATION AND PACKAGING

a. The lengths of rubber fender are to be supplied wrapped in accordance with therequirements of BS 3574 and NES 724.

b. The manufacturer is to mark packaging in accordance with Def Stan 81−41. Inaddition any legal requirement for the packaging is to be legibly and durablymarked with the following details:

(1) description;

(2) NES 170;

(3) contract or order number;

(4) distinctive lot or batch number;

(5) quantity of contents;

(6) date of manufacture;

(7) name of contractor, initials or recognized trade mark;

(8) NATO stock number;

(9) shelf-life expiry date;

(10) gross weight of each package.


6.2


A.1 ANNEX A.

ANNEX A.

RELATED DOCUMENTS

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

See Clause

BS 903 Methods of testing vulcanized rubber Annex C.

Part A2: Determination of tensile stressstrain properties.Part A3: Determination of tear strength.

Part A6: Determination of compression setafter constant strain.Part A19: Heat resistance and acceleratedageing tests.Part A26: Determination of hardness.

BS 1673 Methods of test for raw rubber andunvulcanized compounded rubber.

3.a.

Part 10: Measurement of pre−vulcanizingand curing characteristics by means ofcuremeters.

BS 1674 Equipment and general procedure for mixingand vulcanizing rubber test mixes.

3.a.

BS 3574 Specification for the controlled storage andpackaging of vulcanized rubber and rubberproducts.

6.a.

BS 6349 Marine structures. 5.a.

Part 1: General criteria.

Part 4: Design of fendering and mooringsystems.

NES 724 Packaging. 6.a.

DEF STAN 05−92 Quality System Requirements for productionand installation.

4.a.

DEF STAN 81−41 Packaging of Defence Material. 6.b.

Part 1: General Requirements.

DEF STAN 93−31 Test procedures and process requirements forfully compounded unvulcanized rubber.

4.a.


A.2ANNEX A.


B.1 ANNEX B.

ANNEX B.

DEFINITIONS AND ABBREVIATIONS

B.1 There are no Definitions and Abbreviations for this NES.


B.2ANNEX B.


C.1 ANNEX C.

ANNEX C.

REQUIRED MECHANICAL PROPERTIES OF MATERIAL

PROPERTIES REQUIRED VALUE METHOD

HardnessIRHD

70−78 BS 903 Part: A26Method N

Tensile Stress—Strain(a) Tensile Strength (MNm−2)

10 min BS 903 Part: A2Type 2dumb-bell testpieces. Six testpieces percomposition

(b) Elongation at break (%) 500 min

Compression SetAt 70 ± °C for 24 hours (%)

25 max BS 903 Part: A6Type 1 test piece

Tear Strength(N/mm)

44 min BS 903 Part: A3

Accelerated Air Ageing(168 hrs at 70° C)

BS 903 Parts:A2, A19, A26

Hardness Change IRHD +5 to −5 max

Tensile strength change(% of original value)

+10 to −10 max

Elongation at break change(% of original value)

+5 to −25 max


C.2ANNEX C.


D.1 ANNEX D.

ANNEX D.

CIRCULAR SECTION FENDERS WITH CIRCULAR INNER BORE

D.1 YOUNG’S MODULUS, STIFFNESS AND STORAGE ENERGYREQUIREMENTS

SIZE OFFENDERSIN mmA ¢ B

DIAMETRICRATIOOUTER/INNERA/B

YOUNG’SMODULUSMN/m2

*STIFFNESSKN/m

DEFLEC-TIONmmδ

*STORAGEENERGYkN.m

100 ¢ 60 1.66 8.98 502 60 0.90

200 ¢ 120 1.66 8.98 502 120 3.61

250 ¢ 150 1.66 8.98 502 l50 5.65

300 ¢ 180 1.66 8.98 502 180 8.13

350 ¢ 210 1.66 8.98 502 210 11.07

400 ¢ 250 1.66 8.98 502 250 15.69

450 ¢ 270 1.66 8.98 502 270 18.30

500 ¢ 300 1.66 8.98 502 300 22.59

550 ¢ 330 1.66 8.98 502 330 27.33

600 ¢ 360 1.66 8.98 502 360 32.53

*STIFFNESS AND STORAGE ENERGY REFER TO ONE METRE LENGTH OFA FENDER

YOUNG’S MODULUS:

E=1.7915 − 0.03239(H) − 8.6988 ¢ 10−4 (H)2 + 3.5422 ¢ 10−5 (H)3 MN/m2

Where H is HARDNESS and taken as a median value of 74 IRHD

STIFFNESS:

K=[−0.1599 + 0.1477 (D/d) − 0.01061 (D/d2)] E.L.1000 KN/m

Where (D/d) is DIAMETRIC RATIO, and

L is Length of Unit Fender in m

STORAGE ENERGY:

F=0.5δ2K where δ is deflection in m


D.2ANNEX D.


E.1 ANNEX E.

ANNEX E.


E.1 YOUNG’S MODULUS, STIFFNESS AND STORAGE ENERGYREQUIREMENTS

SIZE OFFENDERS IN

mmA ¢ B


YOUNG’SMODULUSMN/m

*STIFF-NESSKN/m

DEFLEC-TIONmmδ

*STORAGEENERGYKN.m

150 ¢ 75 2.0 8.98 836 75 2.35

200 ¢ 100 2.0 8.98 836 100 4.18

250 ¢ 125 2.0 8.98 836 125 6.53

300 ¢ 150 2.0 8.98 836 150 9.41

380 ¢ 190 2.0 8.98 836 190 15.09

400 ¢ 200 2.0 8.98 836 200 16.72

460 ¢ 230 2.0 8.98 836 230 22.11

500 ¢ 250 2.0 8.98 836 250 26.13

540 ¢ 270 2.0 8.98 836 270 30.47

600 ¢ 300 2.0 8.98 836 300 37.62


YOUNG’S MODULUS:

E = 1.7915− 0.03239(H) − 8.6988¢ 10−4 (H)2+ 3.5422¢ 10−5 (H)3 MN/m2


STIFFNESS:

K=[−0.1599 + 0.1477 (D/d) − 0.01061 (D/d)2] E.L.1000 KN/m



STORAGE ENERGY:



E.2ANNEX E.


F.1 ANNEX F.

ANNEX F.


F.1 YOUNG’S MODULUS, STIFFNESS AND STORAGE ENERGYREQUIREMENTS

SIZE OFFENDERS IN

mmA ¢ B



*STIFF-NESSKN/mδ

DEFLEC-TIONmm

*STORAGEENERGYKN.m

95 ¢ 40 2.4 8.98 1198 40 0.96

195 ¢ 80 2.4 8.98 1198 80 3.83

250 ¢ 105 2.4 8.98 1198 104 6.48

300 ¢ 125 2.4 8.98 1198 125 9.36

350 ¢ 145 2.4 8.98 1198 145 12.59

400 ¢ 165 2.4 8.98 1198 165 16.31

450 ¢ 185 2.4 8.98 1198 185 20.50

500 ¢ 205 2.4 8.98 1198 205 25.17

550 ¢ 230 2.4 8.98 1198 230 31.69

600 ¢ 250 2.4 8.98 1198 250 37.44


YOUNG’S MODULUS:

E=1.7915 − 0.03239(H) − 8.6988 ¢ 10−4 (H)2 + 3.5422 ¢ 10−5 (H)3 MN/m2


STIFFNESS:

K=[−0.1599 + 0.1477 (D/d) − 0.01061 (D/d)2] E.L.1000 KN/m

Where (R/d) is DIAMETRIC RATIO and


STORAGE ENERGY:



F.2ANNEX F.


G.1 ANNEX G.

ANNEX G.

‘D’ SECTION FENDERS WITH ‘D’ SHAPED INNER BORE

G.1 YOUNG’S MODULUS. STIFFNESS AND STORAGE ENERGYREQUIREMENTS

SIZE OFFENDERS IN

mmA ¢ B−C ¢

D

DIAMETRICRATIOOUTER/INNERB/C


*STIFF-NESSKN/m

DEFLEC-TIONmmδ

*STORAGEENERGYKN.m

100 ¢ 100 −60 ¢ 40

1.66 8.98 2256 40 1.80

200 ¢ 150 −90 ¢ 60

1.66 8.98 2256 60 4.06

250 ¢ 200 −120 ¢ 80

1.66 8.98 2256 80 7.22

300 ¢ 250 −150 ¢ 100

1.66 8.98 2256 100 11.28

350 ¢ 300 −180 ¢ 120

1.66 8.98 2256 120 16.24

400 ¢ 350 −210 ¢ 140

1.66 8.98 2256 140 22.11

450 ¢ 400 −240 ¢ 160

1.66 8.98 2256 160 28.88

500 ¢ 450 −270 ¢ 180

1.66 8.98 2256 180 36.55

550 ¢ 500 −300 ¢ 200

1.66 8.98 2256 200 45.12

600 ¢ 550 −330 ¢ 220

1.66 8.98 2256 220 54.60


DIAMETRIC RATIO:

B/C

YOUNG’S MODULUS:

E=1.7915 − 0.03239(H) − 8.6988 ¢ 10−4 (H)2 + 3.5422 ¢ 10−5 (H)3 MN/m2


STIFFNESS:

K=[−0.8393 + 0.9013 (D/d) − 0.1472 (D/d)2] E.L.1000 KN/m



G.2ANNEX G.

L is the Length of Unit Fender in m

STORAGE ENERGY:

F= 0.5δ2K Where δ is deflection in m


H.1 ANNEX H.

ANNEX H.


H.1 YOUNG’S MODULUS, STIFFNESS AND STORAGE ENERGYREQUIREMENTS

SIZE OFFENDERS IN

mmA ¢ B − C ¢

D

DIAMETRICRATIOOUTER/INNERB/C


*STIFF-NESSKN/m

DEFLEC-TIONmmδ

*STORAGEENERGYKN.m

150 ¢ 150 −75 ¢ 50

2.0 8.98 3363 50 4.21

200 ¢ 200 −100 ¢ 65

2.0 8.98 3363 65 7.11

250 ¢ 250 −125 ¢ 80

2.0 8.98 3363 80 10.76

300 ¢ 300 −150 ¢ 100

2.0 8.98 3363 100 16.82

380 ¢ 380 −190 ¢ 125

2.0 8.98 3363 125 26.28

400 ¢ 400 −200 ¢ 135

2.0 8.98 3363 135 30.65

460 ¢ 460 −230 ¢ 155

2.0 8.98 3363 155 40.41

500 ¢ 500 −250 ¢ 165

2.0 8.98 3363 165 45.79

535 ¢ 540 −270 ¢ 180

2.0 8.98 3363 180 54.50

600 ¢ 600 −300 ¢ 225

2.0 8.98 3363 225 85.15


DIAMETRIC RATIO:

B/C

YOUNG’S MODULUS:

E=1.7915 − 0.03239(H) − 8.6988 ¢ 10−4 (H)2 + 3.5422 ¢ 10−5 (H)3 MN/m2


STIFFNESS:

K=[−0.8393 + 0.9013 (D/d) − 0.1472 (D/d)2] E.L.1000 KN/m



H.2ANNEX H.


STORAGE ENERGY:



I.1 ANNEX I.

ANNEX I.


I.1 YOUNG’S MODULUS, STIFFNESS AND STORAGE ENERGYREQUIREMENTS

SIZE OFFENDERS IN

mmA ¢ B − C ¢

D

DIAMETRICRATIOOUTER/INNER B/C

YOUNGSMODULUSMN/m

*STIFF-NESSKN/m δ

DEFLEC-TIONmm

*STORAGEENERGYKN.m

100 ¢ 95 −40 ¢ 25

2.4 8.98 4274 25 1.34

200 ¢ 200 −85 ¢ 55

2.4 8.98 4274 55 6.46

250 ¢ 225 −95 ¢ 65

2.4 8.98 4274 65 9.03

300 ¢ 250 −105 ¢ 70

2.4 8.98 4274 70 10.47

350 ¢ 275 −115 ¢ 75

2.4 8.98 4274 75 12.02

400 ¢ 350 −145 ¢ 95

2.4 8.98 4274 95 19.29

450 ¢ 400 −165 ¢ 110

2.4 8.98 4274 110 25.86

500 ¢ 500 −210 ¢ 140

2.4 8.98 4274 140 41.89

550 ¢ 550 −230 ¢ 155

2.4 8.98 4274 155 51.34

600 ¢ 600 −250 ¢ 165

2.4 8.98 4274 165 58.18

* STIFFNESS AND STORAGE ENERGY REFER TO ONEMETRE LENGTH OFA FENDER

DIAMETRIC RATIO:

B/C

YOUNG’S MODULUS:

E=1.7915 − 0.03239(H) − 8.6988 ¢ 10−4 (H)2 + 3.5422 ¢ 10−5 (H)3 MN/m2


STIFFNESS:

K=[−0.8393 + 0.9013 (D/d) − 0.1472 (D/d)2] E.L.1000 KN/m



I.2ANNEX I.


STORAGE ENERGY:

F=0.5δ2K Where δ is deflection in m


INDEXINDEX.1

ALPHABETICAL INDEX

AAccelerated ageing test, 4.1

Antioxidant, 2.1

Approval Authority, 1.1

BBatch number, 6.1

Bore, 5.1

CChemical analysis, 1.1

Compression set, A.1

Curemeters, A.1

DDEF STAN 05−92, 4.1

EElongation at break, 4.1

Energy storage limits, 5.1

Ethylene/propylene/diene, iii

HHardness, A.1

Hexadiene, 2.1

RRheometer, 3.1

SStrain, A.1

TTear Strength, A.1

Tensile Strength, 4.1


INDEX INDEX.2

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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.

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