BS EN ISO 05778-2000

8/19/2019 BS EN ISO 05778-2000

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BRITISH STANDARD BS EN ISO5778:2000

The European Standard EN ISO 5778:2000 has the status of a British Standard

ICS 47.020.10

NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW

Ships and marinetechnology ÐSmall weathertightsteel hatches

8/19/2019 BS EN ISO 05778-2000


This British Standard, havingbeen prepared under thedirection of the EngineeringSector Committee, was publishedunder the authority of theStandards Committee and comesinto effect on 15 July 2000

© BSI 07-2000

ISBN 0 580 36072 5

BS EN ISO 5778:2000

Amendments issued since publication

Amd. No. Date Comments

National foreword

This British Standard is the official English language version of EN ISO 5778:2000. Itis identical with ISO 5778:1998. It supersedes BS MA 8:1983 which is withdrawn.

The UK participation in its preparation was entrusted to Technical Committee

SME/32, Ships and marine technology Ð Steering committee, which has theresponsibility to:

Ð aid enquirers to understand the text;

Ð present to the responsible international/European committee any enquirieson the interpretation, or proposals for change, and keep the UK interestsinformed;

Ð monitor related international and European developments and promulgatethem in the UK.

A list of organizations represented on this committee can be obtained on request toits secretary.

NOTE When the standard was published as an international standard, the UnitedKingdom did not implement it as a British Standard as it was considered inferior tothe existing BS MA 8:1983. The requirements contained in the international standardwere not as carefully defined or as rigorous as in the British Standard. However,with the adoption of the international standard as a European Standard, theUnited Kingdom is obliged to implement it as the national standard supersedingBS MA 8:1983. Therefore, care should be taken when following this standard thatany statutory or classification society requirements are still met.

Cross-references

Attention is drawn to the fact that CEN and CENELEC Standards normally includean annex which lists normative references to international publications with their

corresponding European publications. The British Standards which implement theseinternational or European publications may be found in the BSI StandardsCatalogue under the section entitled ªInternational Standards CorrespondenceIndexº, or by using the ªFindº facility of the BSI Standards Electronic Catalogue.

A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application.

Compliance with a British Standard does not of itself confer immunity from legal obligations.

Summary of pages

This document comprises a front cover, an inside front cover, the EN ISO title page,the EN ISO foreword page, the ISO title page, page ii, pages 1 to 8, an inside backcover and a back cover.

The BSI copyright notice displayed in this document indicates when the documentwas last issued.

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8/19/2019 BS EN ISO 05778-2000


EN ISO 5778:2000

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ii

Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISOmember bodies). The work of preparing International Standards is normally carried out through ISO technicalcommittees. Each member body interested in a subject for which a technical committee has been established hasthe right to be represented on that committee. International organizations, governmental and non-governmental, inliaison with ISO, also take part in the work. ISO collaborates closely with the International ElectrotechnicalCommission (IEC) on all matters of electrotechnical standardization.

Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.

International Standard ISO 5778 was prepared by Technical Committee ISO/TC 8, Ships and marine technology,

Subcommittee SC 8, Structures.

This second edition cancels and replaces the first edition (ISO 5778:1979), of which it constitutes a technical revision.

Amendments

The following amendments have been made to the first edition (1979-12-15).

a) The nominal size 830 × 630 has been added.

b) The inclined and vertical position of the hatch-seal retaining bar has been admitted.

c) The tolerances for a , b , a 1 and b 2 have been added in tables 2 and 3.

d) The text of 3.4.2 has been supplemented.

e) The distance between the hinge's pivot and the coaming has been changed from 55 mm to 60 mm.

f) The minimum tensile strength of the steel for coamings, cover plates, hinges, etc. has been changed to340 N/mm 2.

g) The designation has been added.

h) The standard has been editorially revised.

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Ships and marine technology — Small weathertight steel hatches

1 Scope

This International Standard specifies the main dimensions, location and number of fittings, materials and quality ofmanufacture for small weathertight steel hatches for application on board ships in order to ensure interchangeability ofthe hatches. The remaining dimensions are left to the manufacturer.

The hatches are suitable for loading operations and for giving access to storage compartments and dry cargo holds.The hatches are not suitable as an access to any kind of tanks and shall not be used as escape hatches.

These hatches generally conform to the requirements of the International Convention on Load Lines 1966 (LLC66).The possibility for application in position 1 and position 2 has to be considered for each situation and, where necessary,the hatch covers shall be provided with additional stiffening.

NOTE — Users of this International Standard should note that while observing the requirements of this standard, they should,at the same time, ensure compliance with such statutory requirements, rules and regulations as may be applicable to theindividual ship concerned.

2 Normative reference

The following standard contains provisions which, through reference in this text, constitute provisions of thisInternational Standard. At the time of publication, the edition indicated was valid. All standards are subject to revision,and parties to agreements based on this International Standard are encouraged to investigate the possibility ofapplying the most recent edition of the standard indicated below. Members of IEC and ISO maintain registers ofcurrently valid International Standards.

ISO 262:— 1), ISO general-purpose metric screw threads – Selected sizes for screws, bolts and nuts.

__________

1) To be published. (Revision of ISO 262:1973)

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3 Main dimensions

3.1 Nominal size

The nominal size of a hatch is based on the inside dimensions of the upper part of the coaming, as shown in figure 1

and table 1.

Dimensions in millimetres

Key1 Hatch seal

Figure 1 — Illustration of nominal sizes

Table 1 — Values of nominal sizes


Nominal sizea × b

630 × 630

630 × 830

830 × 630

830 × 830

1 030 × 1 030

1 330 × 1 330

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3.2 Upper part of coaming

The upper part of the coaming shall conform to the details of figure 2 and table 2. The coaming may have square orrounded corners as shown in figure 2.

In order to prevent damage of the hatch seal, the edges of the upper part of the coaming should be rounded orchamfered.


Figure 2 — Upper part of coaming

Table 2 — Sizes of coaming


Nominal sizea

− 20

b

− 20

630 × 630 630 630

630 × 830 630 830

830 × 630 830 630

830 × 830 830 830

1 030 × 1 030 1 030 1 030

1 330 × 1 330 1 330 1 330

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3.3 Cover plate

The cover plate shall conform to the details of figure 3 and table 3.

Where the nominal size of the cover plate exceeds 830 mm × 830 mm, the cover plate shall be stiffened inaccordance with Regulation 16 (2) of the International Convention on Load Lines (ILLC) 1966.

The hatch-seal retaining bar can be placed in an inclined or vertical position, as indicated in figure 3.


Key

1 Hatch seal retaining bar

Flat 25 × 4

Figure 3 — Cover plates

Table 3 — Sizes of cover plate


Nominal sizea 1

± 2

b 1

± 2

630 × 630 674 674

630 × 830 674 874

830 × 630 874 674

830 × 830 874 874

1 030 × 1 030 1 074 1 074

1 330 × 1 330 1 374 1 374

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3.4 Fittings

3.4.1 Location of closing devices and hinges

All the values given in figure 4, for centre lines of closing devices and hinges, refer to the inside dimensions(nominal size) of the upper part of the coaming.


Key1 Closing device2 Centre line of hinge

Figure 4 — Positions of closing devices and hinges

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3.4.2 Closing devices

Closing devices shall conform to the dimensions of figure 5.

The wing nut shall be suitable for applying a torque convenient for tightness, by only one man without the help ofany tools. Threads of wing nuts and toggle bolts shall be in accordance with ISO 262.


Key

1 Wing nut (typical shape)2 Toggle bolt

3 Toggle bolt pin

4 Centre of toggle bolt

5 Lug

6 Cover plate

7 Hatch seal

8 Coaming

Figure 5 — Closing device

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3.4.3 Hinges

Two hinges shall be fitted to each hatch and shall conform to the dimensions of figure 6. Each hinge shall beprovided with an oval hole, in order to allow the closing devices to compress the hatch seal.


Key1 Cover plate

2 Coaming3 Centre of hinge pin

4 Hatch seal, non-compressed

5 Typical shape

Figure 6 — Hinge

3.4.4 Hatch seal

The hatch seal shall have a cross-section of 45 mm × 20 mm (see figure 7), an initial compression of 2 mm beingallowed.

The hatch seal shall be fitted to the cover plates as indicated in figure 1 and shall be secured by a retaining bar. Thehatch seal shall be bonded to the cover plate by an adhesive suitable for marine conditions.

It shall be ensured, by a depth stop positioned on or near the centre line of each closing device, that the hatch sealmaterial cannot be compressed more than 4 mm.


Figure 7 — Hatch seal, cross-section

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3.4.5 Ancillary fittings

It is recommended that provision be made for securing the hatch cover in the raised position and that hatch coversbe provided with counterbalance weights when necessary.

4 Materials

The coamings and covers shall be manufactured from weldable steel of 340 N/mm² minimum tensile strength orequivalent shipbuilding-quality steel.

The hatch-seal retaining bars, wing nuts, hinges, lugs and ancillary fittings shall be manufactured from weldablemild steel of 340 N/mm² minimum tensile strength.

The toggle bolts and their pins shall be manufactured from corrosion-resistant materials of 350 N/mm² minimumtensile strength.

The quality of the resilient seal material forming the hatch seal shall be satisfactory for service under marineconditions and shall provide effective and lasting sealing and resealing properties when the hatch is tightened undernormal conditions.

5 Quality of manufacture

Coamings and covers shall be free from distortion.

Coamings, covers and fittings shall be free from any exposed rough edges likely to cause injury to persons.

For coamings see also 3.2.

The coamings and covers shall be suitably treated by blast cleaning or another process to remove scale andsurface deposits and shall be given a priming coat of paint to inhibit subsequent corrosion.

Upon assembly of the completed coaming and cover, the manufacturer shall ensure that there is correct registry ofthe edge of the coaming with the hatch seal material and continuous contact between the two components when thehatch is closed.

6 Testing of weathertightness

The completed hatch, when installed on board ship, shall be closed and secured in a normal manner, and thensubjected to a test (hose test or equivalent test) carried out to the satisfaction of the representative of the regulatorybody concerned.

7 Designation

Hatches conforming to this International Standard shall be designated by the following indications, in the ordergiven:

a) denomination: hatch;

b) number of this International Standard: ISO 5778;

c) nominal size, as specified in table 1.

EXAMPLE

Designation of a small weathertight steel hatch in accordance with this International Standard with the nominal size830 mm × 630 mm:

Hatch ISO 5778 — 830 × 630

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BS EN ISO5778:2000

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BS EN ISO 05778-2000