nes 149 access policy in surface ships category 2

Ministry of Defence Defence Standard 02-149 (NES 149)

Issue 1 Publication Date 01 April 2000

Incorporating NES 149 Category 2

Issue 1 Publication Date July 1983

Access Policy In Surface Ships

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) 149 Issue 1 dated July 1983

Ministry of Defence

Naval Engineering Standard

NES 149 Issue 1 July 1983(Reformatted)

ACCESS POLICY IN SURFACE SHIPS

This NES Supersedes

GHS PART B23

Record of Amendments

AMDT INSERTED BY DATE

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NAVAL ENGINEERING STANDARD 149

ISSUE 1 (REFORMATTED)

ACCESS POLICY IN SURFACE SHIPS

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 149Issue 1 (Reformatted)

iii

SCOPE

1. This NES contains the policy for providing normal and emergency access into and within asurface ship. Details of all access fittings and equipments eg doors and hatches are inaccordance with NES 127.

2. This NES does not cover the policy to be followed in order to provide designated removal routesfor equipment/machinery replacement or repair. This policy is laid down in NES 302.

3. This NES includes the requirement to implement the cellularity policy to provide adequatelysized accesses on routes designated for the passage of the weapon equipment transportenvelope.


iv


v

FOREWORD

Sponsorship

1. This Naval Engineering Standard (NES) is sponsored by the Procurement Executive, Ministryof Defence, Director General Ships (DG Ships), Section D113.

2. It is to be applied as required to any Procurement Executive, Ministry of Defence, contract forimplementing the Access Policy for the normal and emergency access into and within a SurfaceShip.

3. If it is found to be technically unsuitable for any particular requirement the sponsor is to beinformed in writing of the circumstances with a copy to DG Ships D191a.

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 by 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. This NES is the property of the Crown and unless otherwise authorized in writing by the MODmust 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 a MOD 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 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, Llannelli,Dyfed SA14 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. This NES may call for the use of processes, substances and/or procedures that may 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. GENERAL 1.1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.1 Ship Access 1.1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.2 Access Routes 1.1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.3 Self Closing Doors 1.1. . . . . . . . . . . . . . . . . . . . . . . . . . . .1.4 Access to Structural Tanks and Voids 1.2. . . . . . . . . . . .1.5 Ladders 1.2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 2. ACCESS ROUTES/PASSAGEWAYS 2.1. . . . . . . . . . . .2.1 Minimum Clear Height 2.1. . . . . . . . . . . . . . . . . . . . . . .2.1.1 Minimum Clear Width 2.1. . . . . . . . . . . . . . . . . . . . . . . .2.1.2 Bulkheads Forming Passageways 2.1. . . . . . . . . . . . . . .2.1.3 Ladders 2.1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 3. TRUNKED ACCESS 3.1. . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 4. ESCAPE FACILITIES 4.1. . . . . . . . . . . . . . . . . . . . . . . .4.1 General 4.1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4.2 Design Parameters 4.1. . . . . . . . . . . . . . . . . . . . . . . . . . .4.3 Compartments—10 or more men 4.1. . . . . . . . . . . . . . .4.4 Compartments—40 or more men 4.1. . . . . . . . . . . . . . .4.5 Compartments within Red Risk Zone 4.1. . . . . . . . . . .4.6 Compartments—less than 10 men

above Red Risk Zone 4.1. . . . . . . . . . . . . . . . . . . . . . . . .4.7 Compartments—escape below or adjacent 4.1. . . . . . .4.8 Compartments—escape above 4.2. . . . . . . . . . . . . . . . .4.9 Escape fittings 4.2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 5. STRUCTURAL REQUIREMENTS 5.1. . . . . . . . . . . . .5.1 Hatches and Manholes 5.1. . . . . . . . . . . . . . . . . . . . . . . .5.2 Doors—Arched Openings—Manholes 5.1. . . . . . . . . . .5.3 Double Bottom Structure and Tanks—Access 5.1. . . . .5.4 Superstructure—Access 5.1. . . . . . . . . . . . . . . . . . . . . . .5.5 Footholds, Handholds and Rungs 5.1. . . . . . . . . . . . . . .


viii

SECTION 6. SAFETY REQUIREMENTS 6.1. . . . . . . . . . . . . . . . . . .6.1 General 6.1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6.2 WT and GT Doors and Hatches—Clips 6.1. . . . . . . . . .6.3 WT and GT Doors and Hatches—

Mechanical Operation 6.1. . . . . . . . . . . . . . . . . . . . . . . .6.4 Handholds 6.1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 7. ACCESS TALLIES 7.1. . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 8. INSPECTION, TESTS AND TRIALS 8.1. . . . . . . . . . .

SECTION A. RELATED DOCUMENTS A.1. . . . . . . . . . . . . . . . . . . .

SECTION B. DEFINITIONS AND ABBREVIATIONS B.1. . . . . . . .B.1 Definitions B.1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B.2 Abbreviations B.1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ALPHABETICAL INDEX


1.1

1. GENERAL

1.1 Ship Access

a. Access is to be provided into and within the ship by doors, hatches, ladders,arched openings and manholes. Additional access to all parts of the shipsstructure for maintenance during the ship’s life is provided by access openings,footholds and handholds. The ship design standards for watertight and gastightintegrity, structural strength and protection are not to be prejudiced.

b. Doors, hatches and manholes are to be sized and constructed in accordance withNES 127 and the Ship Design Requirements.

c. Arched openings are to provide for the same minimum clear opening as wouldbe achieved by the fitting of a standard WT and GT door, or the special accessprovided on designated weapon equipment transport envelope routes.

d. Access openings through structure etc for cleaning and maintenance purposesare to be of sufficient size to allow easy passage of personnel.

e. Where design parameters permit, all decks above the red risk zone are to havegood fore and aft access by means of passageways on both port and starboardside, or, a throughway at the centreline.

1.2 Access Routes

a. Compartments designed to contain large numbers of men (40 or more) are tobe provided with two widely separated standard accesses, arranged wherepossible to provide escape to separate routes (see Sections 6 and 7).

b. Access routes from accommodation ladders and brow positions into the ship androutes from services and dining halls etc are to be well defined and clear ofobstruction to facilitate rapid dispersal.

c. The provision of normal access is to be considered in conjunction with therequirements for removal and storing routes so that wherever possible commonaccesses are provided.

d. The provision of practical access routes to weapon compartments of sufficientsize to pass a weapon equipment transport envelope of maximum size2000mm¢1700mm¢750mm is to be implemented in parallel with normalaccess requirements. This can be met by the inclusion of special access fittings,ie larger than standard doors and hatches, or alternatively by utilizing portableplates and/or soft plated areas. As far as design parameters permit, larger doorsand hatches should be incorporated in large ships, whilst a combination of alltypes of fittings should be utilized in small ships.

1.3 Self Closing Doors

a. To enable structural doors to be secured in the open position for ready accesswhilst limiting the infiltration of air at ambient temperatures into airconditioned spaces, self closing doors are to be fitted at the boundary accessesto these spaces.

b. Exceptions to this requirement can be made where the adjacent areas utilize‘leak off’ air, eg galleys, bathrooms etc.

c. These arrangements are to allow for securing the self-closing doors in the openposition and clear of fittings whilst securing the structural doors.


1.2

1.4 Access to Structural Tanks and Voids

a. Access to structural tanks and voids is to be made by manholes and, exceptwhere size positively prohibits, two accesses to each space are to be provided.

b. The manholes are to be sited at each end of the tank space and if possible atopposite corners clear of obstructions.

c. Openings of sufficient size are to be arranged through intermediate plate framesand longitudinals etc to give access to all parts of the structure for maintenanceand preservation purposes.

1.5 Ladders

a. The construction and fitting details of all ladders are to be in accordance withNES 127.

b. The following ladders are to be fitted for vertical access:

(1) Sloping Ladders For all normal deck to deck access.

(2) Vertical Ladders For deck to deck access where space is at apremium coupled with little usage. Theymay be incorporated to provide emergencyescape facilities in certain areas and alsofor specific purposes eg masts and tanks.

(3) Jumping Ladders For escape purposes (see Section 7).

(4) Accommodation Ladder For personnel embarkation into the shipfrom auxiliary craft, ship’s boats andpontoons.

(5) Mediterranean Ladder Provides similar but simpler facilities as theaccommodation ladder. To be incorporatedin addition to the accommodation ladder asan alternative arrangement.

(6) Pilot or Side Ladder For pilot and personnel embarkation into theship from auxiliary craft and ship’s boatswhen neither the accommodation orMediterranean ladders are rigged.


2.1

2. ACCESS ROUTES/PASSAGEWAYS

2.1 Minimum Clear Height

a. A minimum clear height of 2000mm to be provided in all passageways.

b. In way of WT and GT doors the clear height is to be sufficient to accommodatethe door and associated fittings eg 2400mm on highest red deck where astandard door is utilized or 2500mm where special access for transport envelopeis incorporated.

2.2 Minimum Clear Width

a. In large ships all main access routes ie fore and aft and large athwartshippassageways are to have a minimum clear width of 1250mm. Minorpassageways eg compartment access to main passageways are to have aminimum clear width of 950mm.

b. In small ships the minimum clear widths are to be 1100mm for main accessroutes and 800mm for minor access routes.

c. The minimum clear width to accommodate the larger doors provided for specialaccess on weapon equipment transport routes is to be 1375mm.

2.3 Bulkheads Forming Passageways

a. Wherever possible stiffeners, including swedges, are to be fitted on the reverseside of bulkheads forming main passageways.

b. In exceptional circumstances where this is impracticable, or where it is essentialto site items of equipment in passageways, the clear widths given in 2.2.a. areto be maintained in way of the stiffeners and or equipment. The latter beingsited in recesses in the bulkheads wherever it is considered necessary and designparameters permit.

c. Corners of minor bulkheads are to be rounded to 150mm radius at passagewayjunctions.

2.4 Ladders

a. Where sloping ladders are fitted to provide either internal or external verticalaccess, landings are to extend at least one metre from both the foot and head ofladder.

b. Where vertical ladders are fitted, adequate clear space is to be arranged aroundand at the top and bottom landings sufficient for personnel to ascend anddescend whilst wearing breathing apparatus, protective clothing etc.

c. All ladders are to be removable and where possible ladderway hatches oninternal decks are to be arranged vertically above each other in order to providea practical equipment removal or storing route.


2.2


3.1

3. TRUNKED ACCESS

a. Access to important compartments situated within the Red Risk Zone that aremanned in action are to be trunked, and constructed to a standard thatmaintains the ships WT integrity, to a level above the Red Risk Zone.

b. WT hatches are to be provided at each WT deck at which compartments are tobe entered from the trunk. Doors serving such compartments, except whereused for Magazine Venting purposes, are to open into that compartment and areto be WT as necessary to maintain the ships WT integrity.

c. Compartments typical of those to be served by trunks are magazines, controlspaces, shaft passages, machinery spaces, steering gear compartments,generator compartments and pump spaces.

d. Where large compartments are involved eg machinery spaces, a minimum oftwo trunked accesses are to be provided. These are to be widely separated eitherport or starboard or forward and aft, depending on the ship arrangements.


3.2


4.1

4. ESCAPE FACILITIES

4.1 General

a. The use of modern materials, including plastics, and the grouping ofcompartments for ventilation and air conditioning purposes, necessitates theprovision of escape facilities from potential fire hazards and smoke or fumefilled compartments.

b. The general standards of Ship Design requirements are to be in accordance withNES 119.

4.2 Design Parameters

a. The design parameters for escape routes depend upon the location of thecompartment, length of escape route, proximity of high fire risk spaces and theprovision of fire fighting equipment (breathing apparatus and survival supportequipment).

b. All facilities available for rapidly containing the fire and products of combustioninvolving the closing of ventilation and access openings, or alternatively thepracticability of clearing smoke and fumes by the use of ventilation trunks, alsohave a bearing on escape requirements.

c. Only a basis for the provision of escape facilities can therefore be defined, andthe following general criteria are intended to present a design philosophy.

4.3 Compartments—10 or more men

a. Compartments or groups of compartments containing 10 or more men are to beprovided with escape facilities giving egress to escape routes separate fromnormal access.

4.4 Compartments—40 or more men

a. Where, in compartments, containing 40 or more men, it has been foundimpracticable to provide egress to separate escape routes for each accessprovided in accordance with Section 4, additional escape scuttles are to be fittedif this facilitates egress to a separate escape route.

4.5 Compartments within Red Risk Zone

a. Compartments or groups of compartments within the red risk zone which aremanned in action are to be provided with trunked access in accordance withSection 6.

4.6 Compartments—less than 10 men above Red Risk Zone

a. Compartments containing less than 10 men located above the red risk zonewhere there is a particular danger of entrapment by fire or products ofcombustion eg close proximity to high fire risk compartments combined witha long escape route to an open deck area, consideration is to be given to theprovision of trunked access to the weather deck.

4.7 Compartments—escape below or adjacent

a. Where alternative overhead escape is not practicable, escape to compartmentsbelow or adjacent is to be considered, providing WT integrity or security incertain limited areas is not impaired.


4.2

4.8 Compartments—escape above

a. Where secondary escape facilities lead to the same smoke filled passageway orlobby, the emergency escape is to lead to the compartment above provided thereis no commonality between that compartment and the passageway or lobby egby ventilation trunking.

b. Where secondary accesses do not provide egress to separate routes in the caseof fire, they may be of value in the event of flooding and also provide a meansof escape when normal access fittings are jammed.

4.9 Escape fittings

a. Hatches are to incorporate escape manholes operable from above and belowand of sufficient size to allow for the passage of personnel wearing breathingapparatus. Additionally the hatches on escape routes must also be operablefrom either above or below by one man.

b. Escape Scuttles are to be operable from both within the compartment fromwhich escape is desired and from the external position ie operable from eitherside. The scuttles are to be of sufficient size to allow the passage of personnelwearing breathing apparatus.

c. Kick-out Panels are to be fitted in non-watertight doors to living and workingspaces unless security reasons require otherwise.

d. Quick Acting Watertight Doors (QAWTD) are not to be fitted at main WTbulkheads or where the ships watertight integrity may be prejudiced. In thesesituations full separately clipped watertight doors (WT doors) are to beincorporated but suitable QAWTD may be considered for use elsewhere.

e. Flexible Emergency Ladders (Jumping Ladders) complete with decksecuring arrangements are to be fitted at:

(1) every hatch where between deck height to coaming top exceeds 2400mm

(2) all hatches to machinery spaces irrespective of height between platformlevel

(3) every escape hatch and deck scuttle not fitted with a permanent ladder.

NES 149Issue 1 (Reformaatted)

5.1

5. STRUCTURAL REQUIREMENTS

5.1 Hatches and Manholes

a. Hatches and manholes are to be sited to avoid cutting deck supportingstructure. Where this is unavoidable, beams or longitudinals are to be crankedas practicable and adequate compensation incorporated by half beams andcastings.

b. Consideration must be given to ensuring that hatches and other access openingsare sited to minimize the greatest loss of effective deck area from both strengthand layout aspects.

5.2 Doors—Arched Openings—Manholes

a. In locating doors, arched openings and manholes in main structural bulkheads,care is to be taken to minimize cutting stiffeners. Compensation stiffening is tobe worked where this is unavoidable.

5.3 Double Bottom Structure and Tanks—Access

a. Access to all parts of double bottom structure and tanks is to be provided bymeans of access holes arranged on plate floors and longitudinals, except wherethese are required to be watertight or oil tight.

b. The holes are to be arranged in conjunction with each other and with the accessmanholes to provide free and easy access to the spaces.

c. Consideration must be given to ensure maintenance and uniformity of strengththroughout structural members.

5.4 Superstructure—Access

a. In order to preserve shear strength, access openings in superstructure sides areto be staggered port and starboard, and sited as far as practicable away from theintersection with main transverse bulkheads.

b. Access openings in superstructure bulkheads and decks are to be arranged withconsideration to maintenance of shear strength and continuity of longitudinalstrength eg openings should be sited wherever possible away from the ships’side area and the cutting of main strength structure avoided.

5.5 Footholds, Handholds and Rungs

a. Footholds, handholds and rungs etc fitted to meet the requirements of Section1. must be compatible with the integrity and strength of structuralarrangements into which they are incorporated.

b. Where separate rungs are fitted in lieu of vertical ladders, they are to be inaccordance with NES 127.


5.2


6.1

6. SAFETY REQUIREMENTS

6.1 General

a. Access arrangements are to be kept under continuous review during the shipbuild and major refits to ensure that personnel safety and operatingrequirements are being achieved and maintained.

b. Additional accesses or changes to access arrangements found necessary by thereview are to be incorporated.

c. Safety of personnel must be of prime importance when siting or arrangingaccess. Consideration must be given to ease of access under adverse conditionsie in a darkened smoke filled atmosphere, under conditions of list or excessivetrim etc.

d. Hazards such as hatches sited at or adjacent to the foot of a ladder or a door areto be avoided.

e. All passageways, doors, hatches and manholes are to be kept clear ofobstructions and projections.

f. Particular attention is to be given to safety standards where hatches arearranged vertically above each other through 2 or more deck levels.

g. Ladders, where possible, are to be arranged fore and aft and sited clear ofthrough passageways, with adequate space at the top and bottom of ladder fortransit of firefighting equipment and breathing apparatus.

6.2 WT and GT Doors and Hatches—Clips

a. Clips for WT and GT doors and hatches are to be in accordance with NES 127.

b. Securing arrangements are to be provided to retain doors and hatches in theopen position.

c. The securing arrangements are to be sufficiently robust to ensure that the dooror hatch remains secure against heavy sea motions of rolling and pitching andtransmitted shock forces.

6.3 WT and GT Doors and Hatches—Mechanical Operation

a. Heavy doors and hatches with a weight in excess of 150kg are to be fitted witha mechanical means of operation sufficient to ensure that access can be openedor closed against an adverse trim or heel.

6.4 Handholds

a. Safety handholds for personnel are to be fitted as convenient to deckheads oradjacent structure in way of all ladders.


6.2


7.1

7. ACCESS TALLIES

a. All doors, hatches and manhole covers are to be clearly marked in accordancewith NES 118 and NES 119.

b. Tallies are to be in accordance with DGS 379.

NES 149Issue 1 *(Reformatted)

7.2


8.1

8. INSPECTION, TESTS AND TRIALS

a. All access routes including ladders, doors and hatches etc are to be subject toperiodic inspection to ensure that the specified standards are beingincorporated and maintained.

b. Additional tests and inspections may be carried out as required by NES 23 andNES 127.

c. WT and GT doors and hatches are to be chalk tested after fitting to demonstratethat a continuous seating has been achieved at bearing surfaces.

d. Subsequent water or air tests are to be carried out to the standards specified forthe compartments they give access to.

e. Manhole covers are to be considered as an integral part of the boundarystructure of the compartment or tank they give access to and are therefore tobe tested accordingly.


8.2


A.1 ANNEX A.

ANNEX A.

A. RELATED DOCUMENTS

a. Reference is made:

Referred to inClause

NES 23 Trials, Tests and Inspection of Ship 8.b.

NES 118 NBCD Material 7.a.

NES 119 Ship Fire Protection and Damage Control 4.1.b., 7.a.

NES 127 Access Fittings and Equipment SCOPE 1.,B.1.a., 1.1.b.,1.5.a., 5.5.b.,6.2.a., 8.b.

NES 302 Maintenance Envelopes and Removal Routes 7.b.

DGS 379*(NES 723)

Standard Tallies for use in HM Ships and S/Ms—Requirements for Marker Plates

7.b.

NOTE *In course of preparation—when published will supersede relateddocument.

b. Information concerning the Issuing Authorities of the related documents maybe obtained from the local Ministry of Defence (PE) Quality Assurancerepresentative or Ship Department Section D191b, Foxhill, Bath BA1 5AB(Telephone Bath (0225) 61211).

c. All applications to Ministry establishments for related documents are to quotethe relevant Ministry of Defence (PE) invitation to tender or the contractnumber and date, together with the sponsoring Directorate and the tender orcontract sponsor.


A.2ANNEX A.


B.1 ANNEX B.

ANNEX B.

B. DEFINITIONS AND ABBREVIATIONS

B.1 Definitions

a. For the purpose of this NES the following Definitions and Abbreviations apply:

Large Ships Ships of approximately 4000 tonnes and over displace-ment.

Red Risk Zone The zone of primary flooding in the event of ship damagewhich will normally be specified in the ship contract.

Removal Route A route giving adequate passage for an equipment withminimum removal of permanently sited fittings, equip-ment, structure, pipes, etc from its operational position to asuitable off-loading position.

Small Ships Ships below 4000 tonnes displacement.

Special Access Doors and hatches, larger than the standard range andincluded in NES 127 or alternatively portable plates/softplated areas, specifically incorporated on weaponequipment access routes for the passage of the transportenvelopes.

Standard Access Doors, hatches, openings etc complying with the standardrange of size for such accesses contained in NES 127.

Weapon EquipmentTransport Envelope

The minimum size of access required on the shippingroutes.

B.2 Abbreviations

GT Gastight

QAWTD Quick acting watertight door

WT Watertight


B.2ANNEX B.


INDEXINDEX.1

ALPHABETICAL INDEX

AAccessdouble bottom structure, 5.1holes, 5.1routes, 2.1ship, 1.1structure-tanks, 1.2superstructure, 5.1tallies, 7.1trunks, 3.1

Ambient temperatures, 1.1

Arched openings, 1.1size, 1.1

Arched Openings , siting , 5.1

BBrow, 1.1

Bulkhead−Radius , 2.1

CClipsdoor, 6.1hatch, 6.1retaining door, 6.1

DDining halls, 1.1

Doorsclips, 6.1marking , 7.1mechanical operation , 6.1quick acting, 4.2size, 1.1watertight, 3.1watertight—gastight, 2.1, 5.1, 6.1watertight-gastight, 1.1

FFire Hazard, 4.1

Footholds, 1.1, 5.1

GGastight integrity, 1.1


INDEX INDEX.2

HHandholds , 6.1Hatches, 1.1, 6.1clips, 6.1escape , 4.2marking , 7.1mechanical operation, 6.1securing arrangements, 6.1siting , 5.1, 6.1size, 1.1tests, 8.1

IInspections, Tests, Trials, 8.1Intermediate Plate Frames, 1.2Internal Decks , 2.1

KKick−Out Panels , 4.2

LLadders, 1.1, 1.2, 2.1, 6.1, 8.1accommodation, 1.1, 1.2construction, 1.2landings , 2.1jumping, 1.2, 4.2Mediterranean, 1.2pilot-side, 1.2sloping, 1.2vertical, 1.2, 2.1, 5.1Leak-Off air, 1.1

Longitudinals , 5.1Longtitudinals, 1.2

MManholes, 1.1, 1.2, 5.1, 6.1marking, 7.1size, 1.1siting, 5.1, 6.1sizing, 1.2testing, 8.1

PPassageways, 1.1, 2.1, 6.1Plastics, 4.1

RRed Risk Zone, 1.1, 3.1, 4.1


INDEXINDEX.3

Routesescape, 4.1, 4.2removal, 1.1removal, 2.1storing, 1.1storing, 2.1

Rungs, 5.1

SSafety, 6.1

Services, 1.1

Stiffeners, 2.1

Structural strength, 1.1, 5.1

Swedges, 2.1

TThroughway, 1.1

WWatertight Integrity, 1.1


INDEX INDEX.4

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