Small craft - Permanently installed fuel systems (ISO/FDIS 10088:2021)

Kleine Wasserfahrzeuge - Dauerhaft installierte Kraftstoffsysteme (ISO/FDIS 10088:2021)

Dieses Dokument legt die Anforderungen an Gestaltung, Werkstoffe, Konstruktion, Einbau und Prüfungen für fest eingebaute Kraftstoffsysteme für Hubkolben-Verbrennungsmotoren fest.
Es findet Anwendung auf alle fest eingebauten Kraftstoffsysteme für Dieselkraftstoff und Ottokraftstoff, und zwar von der Kraftstofffüllöffnung bis zu der Verbindungsstelle mit dem Antriebs- oder Hilfsmotor für durch Einbau und Außenbordmotoren angetriebene kleine Wasserfahrzeuge.
Die Anforderungen an die Konstruktion und die Prüfung von fest eingebauten Ottokraftstoff- und Dieselkraftstofftanks für Verbrennungsmotoren auf kleinen Wasserfahrzeugen sind in ISO 21487:2012 festgelegt.

Petits navires - Systèmes à carburant installés à demeure (ISO/FDIS 10088:2021)

Mala plovila - Trajno vgrajeni sistemi za gorivo (ISO/FDIS 10088:2021)

General Information

Status
Not Published
Technical Committee
Current Stage
5060 - Closure of Vote - Formal Approval
Due Date
31-Aug-2021
Completion Date
31-Aug-2021

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SLOVENSKI STANDARD
oSIST prEN ISO 10088:2020
01-julij-2020
Mala plovila - Trajno vgrajeni sistemi za gorivo (ISO/DIS 10088:2020)
Small craft - Permanently installed fuel systems (ISO/DIS 10088:2020)

Kleine Wasserfahrzeuge - Dauerhaft installierte Kraftstoffsysteme (ISO/DIS 10088:2020)

Petits navires - Systèmes à carburant installés à demeure (ISO/DIS 10088:2020)
Ta slovenski standard je istoveten z: prEN ISO 10088
ICS:
47.020.20 Ladijski motorji Marine engines and
propulsion systems
47.080 Čolni Small craft
oSIST prEN ISO 10088:2020 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN ISO 10088:2020
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oSIST prEN ISO 10088:2020
DRAFT INTERNATIONAL STANDARD
ISO/DIS 10088
ISO/TC 188 Secretariat: SIS
Voting begins on: Voting terminates on:
2020-05-25 2020-08-17
Small craft — Permanently installed fuel systems
Petits navires — Systèmes à carburant installés à demeure
ICS: 47.080
THIS DOCUMENT IS A DRAFT CIRCULATED
This document is circulated as received from the committee secretariat.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
ISO/CEN PARALLEL PROCESSING
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 10088:2020(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION. ISO 2020
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oSIST prEN ISO 10088:2020
ISO/DIS 10088:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
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Published in Switzerland
ii © ISO 2020 – All rights reserved
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oSIST prEN ISO 10088:2020
ISO/DIS 10088:2020(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 General requirements ..................................................................................................................................................................................... 3

4.1 Materials and design .......................................................................................................................................................................... 3

4.2 Testing ............................................................................................................................................................................................................ 4

4.3 Installation .................................................................................................................................................................................................. 5

5 Fuel pipes, hoses, connections and accessories ................................................................................................................... 5

5.1 Fuel filling lines ...................................................................................................................................................................................... 5

5.2 Vent lines and components .......................................................................................................................................................... 6

5.3 Fuel distribution, return and balancing lines ............................................................................................................... 6

5.4 Hose fittings and hose clamping .............................................................................................................................................. 7

5.5 Valves and fittings................................................................................................................................................................................. 8

5.6 Fuel filters ................................................................................................................................................................................................... 8

5.7 Labelling ....................................................................................................................................................................................................... 8

Annex A (normative) Pressure testing ............................................................................................................................................................... 9

Annex B (informative) Diurnal emissions of petrol fuel systems ........................................................................................10

Annex ZA (informative) Relationship between this European Standard and the essential

requirements of Directive 2013/53/EU aimed to be covered ............................................................................17

Bibliography .............................................................................................................................................................................................................................18

© ISO 2020 – All rights reserved iii
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oSIST prEN ISO 10088:2020
ISO/DIS 10088:2020(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/ patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/

iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 188, Small craft

This fifth edition cancels and replaces the fourth edition (ISO 10088:2013), which has been technically

revised.
The main changes compared to the previous edition are as follows:

— permeation test limits and test procedures have been added as an Informative Annex B to serve as

a harmonized reference for evaporative emissions.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2020 – All rights reserved
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oSIST prEN ISO 10088:2020
DRAFT INTERNATIONAL STANDARD ISO/DIS 10088:2020(E)
Small craft — Permanently installed fuel systems
1 Scope

This International Standard specifies the requirements for the design, materials, construction,

installation and testing of permanently installed fuel systems as installed for internal combustion

engines.

It applies to all parts of permanently installed diesel and petrol fuel systems as installed, from the

fuel fill opening to the point of connection with the propulsion or auxiliary engine(s) on inboard- and

outboard-powered small craft of up to 24 m hull length as defined in ISO 8666.

Requirements for the design, materials, construction and testing of permanently installed fixed fuel

tanks are given in ISO 21487.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 1817:2015, Rubber, vulcanized or thermoplastic — Determination of the effect of liquids

ISO 7840:2013, Small craft — Fire-resistant fuel hoses
ISO 8469:2013, Small craft — Non-fire-resistant fuel hoses

ISO 8846:1990, Small craft — Electrical devices — Protection against ignition of surrounding

flammable gases
ISO 8666:2016, Small craft — Principal data

ISO 10133:2012, Small craft — Electrical systems — Extra-low-voltage d.c. installations

ISO 11105:1997, Small craft — Ventilation of petrol engine and/or petrol tank compartments

ISO 11192:2005, Small craft — Graphical symbols

ISO 13297:2014, Small craft — Electrical systems — Alternating current installations

ISO 21487:2012, Small craft — Permanently installed petrol and diesel fuel tanks
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
© ISO 2020 – All rights reserved 1
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oSIST prEN ISO 10088:2020
ISO/DIS 10088:2020(E)
3.1
accessible

capable of being reached for inspection, removal or maintenance without removal of permanent craft

structure

Note 1 to entry: Hatches are not regarded as permanent craft structures in this sense, even if tools such as

wrenches or screwdrivers are needed to open them. Hatches for inspection or maintenance of fuel tanks are

permitted to be covered by uncut carpet, provided that all tank fittings can be inspected and maintained through

other openings.
3.2
readily accessible

capable of being reached quickly and safely for maintenance or effective use under emergency

conditions without the use of tools
3.3
permanently installed
securely fastened so that tools are required for removal
3.4
anti-siphon valve

demand valve which can be opened only by fuel pump suction to withdraw fuel from a tank and which

will remain closed when the fuel pump is not operating, preventing siphon action created by a break or

leakage at any point in the fuel distribution system
3.5
static floating position

attitude in which the craft floats in calm fresh water according to light craft mass m with each fuel

LCC

tank filled to rated capacity but excluding all non-permanently attached interior and exterior equipment

[1]
Note 1 to entry: Light craft mass m is specified in ISO 8666:2002, 6.3.
LCC
[SOURCE: ISO 13590:2003, 3.3, modified]
3.6
petrol

hydrocarbon fuel, or blend thereof, which is liquid at atmospheric pressure and is used in spark-

ignition engines
3.7
diesel

hydrocarbon fuel, or blend thereof, which is liquid at atmospheric pressure and is used in compression-

ignition engines
3.8
spud

rigid pipe or spigot used for the connection of pipes and hoses to tanks or components such as filters

and pumps
3.9
swaged sleeve

permanently attached fuel hose end fitting obtained by applying even compression to a metal sleeve

or ferrule, sufficient to make the inner lining of the hose take up the shape of the insert and create a

pressure seal
Note 1 to entry: See Figure 1.
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oSIST prEN ISO 10088:2020
ISO/DIS 10088:2020(E)
Key
1 hose
2 sleeve
Figure 1 — Swaged sleeve
3.10
sleeve and threaded insert

permanently attached fuel hose end fitting made by screwing an insert sleeve with threads into the

hose and applying even compression to a metal sleeve or ring to secure the hose in place

Note 1 to entry: This type of connection can be made with the sleeve placed on the outside of the hose and then

screwing the threaded insert into the inner lining.
3.11
compartment
cabin or enclosure able to be closed to the outside of the craft
3.12
craft’s ground

ground which is established by a conducting connection (intended or accidental) with the common

ground (potential of the earth’s surface), including any conductive part of the wetted surface of the hull

Note 1 to entry: “Ground” is also known as “earth”.
3.13
evaporative emissions

fuel emissions that result from permeation of fuel through the fuel system materials or from ventilation

of the fuel system
4 General requirements
4.1 Materials and design

4.1.1 Individual components of the fuel system, and the fuel system as a whole, shall be designed to

withstand the combined conditions of pressure, vibration, shocks, corrosion and movement encountered

under normal operating conditions and storage.

4.1.2 Each component of the fuel system, and the fuel system as a whole, shall be capable of operation

within an ambient temperature range of − 10 °C to + 80 °C, without failure or leakage, and be capable

of being stored without operation within an ambient temperature range of − 30 °C to + 80 °C, without

failure or leakage.

NOTE Thermoplastic tanks and components may be affected by high return fuel temperature. It is therefore

important to read the engine installation manual for information.
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oSIST prEN ISO 10088:2020
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4.1.3 All materials used in the fuel system shall be resistant to deterioration by its designated fuel and

to other liquids or compounds with which it may come into contact under normal operating conditions,

e.g. grease, lubricating oil, bilge solvents and sea water.

4.1.4 Petrol engine compartments and petrol tank compartments shall have ventilation and ignition

protection in accordance with ISO 11105 and ISO 8846.
4.1.5 The only outlets for drawing fuel from the fuel system shall be

— plugs in petrol filter bowls intended solely for the purpose of servicing the filter,

— plugs or valves in diesel filter bowls intended solely for the purpose of servicing the filter.

NOTE Tank openings are covered by ISO 21487.

4.1.6 Any metal or metallic plated component of a petrol tank and its filling system that is in contact

with petrol shall be grounded so that its resistance to the craft’s ground is less than 1 Ω.

Grounding wires shall not be installed between a hose and its clamps.

4.1.7 Fuel filling systems shall be designed to avoid blowback of fuel through the fill fitting. Fuel

systems shall be tested in accordance with 4.2.3.

4.1.8 Provision shall be made to prevent fuel overflow from the vent opening from entering the craft or

the environment.

4.1.9 All fuel system components in engine compartments (e.g. filters, pumps, water separators, and

hoses) – excluding permanently installed fuel tanks, which are tested in accordance with ISO 21487 –

shall individually, or as installed in the craft, be capable of withstanding a 2,5 min fire test as specified in

ISO 7840:2013, Annex A.

Fasteners supporting metal fuel lines constitute an exception to this requirement.

4.1.10 Copper-base alloy fittings may be used for aluminum tanks if protected by a galvanic barrier to

reduce galvanic corrosion.

4.1.11 A means to determine the level of fuel in the tank or quantity shall be provided.

4.1.12 Petrol fuel systems must meet evaporative emissions limits set forth in Annex B.

4.2 Testing

4.2.1 After installation, the fuel system as a whole shall pass the pressure test specified in Annex A.

4.2.2 Small components of the fuel system (e.g. filters, pumps, water separators, and hoses), required

to be fire tested according to 4.1.9, shall be tested as specified in ISO 7840:2013, Annex A, with the

lower part mounted 250 mm above the surface of liquid in a pan of which the sides extend beyond

the component by 150 mm. The component to be tested shall be a complete assembly and include all

accessories intended to be attached directly to the component.

4.2.3 There shall be no blow back of fuel through the fill fitting when filling at a rate of 30 l/min from

25 % to 75 % of the capacity on the tank label. For fuel tanks of 100 l capacity or less, the fill rate may

be reduced to 20 l/min. (see 4.1.7). The test to determine compliance with this shall be performed on at

least one craft or a representative installation.
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4.3 Installation

4.3.1 The fuel system shall be permanently installed. All component parts, except small connectors

and fittings and short sections of flexible hoses, shall be independently supported.

4.3.2 All valves and other components intended to be operated or observed during normal operation

of the craft, or for emergency purposes, shall be readily accessible. All fittings and connections of the fuel

system shall be readily accessible, or accessible through an access panel, port or hatch. Tanks need not be

accessible for removal.

4.3.3 The clearance between a petrol fuel tank and a combustion engine shall not be less than 100 mm.

4.3.4 The clearance between a petrol tank and exhaust components having a temperature exceeding

90 °C shall not be less than 250 mm, unless an equivalent thermal barrier is provided.

4.3.5 Fuel system electrical components shall be installed in accordance with ISO 10133 or ISO 13297.

4.3.6 Fuel tanks and components of petrol fuel systems shall not be installed directly above batteries

unless the batteries are protected against the effects of fuel leakage.
5 Fuel pipes, hoses, connections and accessories
5.1 Fuel filling lines

5.1.1 The minimum inside diameter of the fill pipe system shall be 28,5 mm and the minimum inside

diameter of fuel filling hoses shall be 38 mm.

5.1.2 Fuel filling hoses located in engine compartments shall be fire resistant, of type A1, A2 or A15

in accordance with ISO 7840:2013. Fuel fill hoses outside engine compartments shall be of either

type A1, A2, or A15 in accordance with ISO 7840:2013, or of type B1, B2, or B15 in accordance with

ISO 8469:2013.
NOTE The 1, 2, and 15 designations describe the level of permeation:
1 = 100 g/m /24 h;
2 = 300 g/m /24 h;
15 = g/m /24 h.

5.1.3 Fuel filling lines shall be self-draining to the tank(s) when the craft is in its static floating position.

5.1.4 The fuel filling system shall be designed so that accidental fuel spillage does not enter the craft

when it is in its static floating position.

5.1.5 The distance between compartment ventilation openings and fuel fill openings shall be at least

400 mm, except where the craft’s coaming, superstructure or hull creates a barrier to prevent fuel vapour

entering the craft through the ventilation opening.

5.1.6 The fuel filling point shall be marked “petrol” or “diesel” and/or with a symbol specified in

ISO 11192 to identify the type of fuel to be used.
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oSIST prEN ISO 10088:2020
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5.2 Vent lines and components
5.2.1 Each fuel tank shall have a separate vent line.

5.2.2 Vent hoses located in engine compartments shall be fire resistant, of type A1, oA2, or A15 in

accordance with ISO 7840:2013. Vent hoses outside engine compartments shall be of either type A1, A2,

or A15 in accordance with ISO 7840:2013, or type B1, B2, or B15 in accordance with ISO 8469:2013.

5.2.3 Each ventilation pipe shall have a minimum inside diameter of 11 mm (95 mm ) or a ventilation

opening designed to prevent the tank pressure from exceeding 80 % of the maximum test pressure

marked on the tank label when tested in accordance with ISO 21487.

5.2.4 Vent lines shall not have valves other than those that permit free f low of air and prevent f low of

liquid (fluid) both in and out of the tank(s).

5.2.5 Vent lines shall be self-draining when the craft is in its static floating position.

5.2.6 The distance between compartment ventilation openings and fuel vent openings shall be at least

400 mm, except where the craft’s coaming, superstructure or hull creates a barrier to prevent fuel vapour

entering the craft through the ventilation opening.

5.2.7 The vent line shall be arranged to minimize intake of water without restricting the release of

vapour or intake of air and shall not allow fuel or vapour overflow to enter the craft.

5.2.8 The vent-line termination or a gooseneck in the vent-line routing shall be arranged at sufficient

height to prevent spillage of fuel through the vent line during filling and entry of water under normal

operating conditions of the craft.

For sailing monohulls, normal operating conditions include heeling at an angle of up to 30°.

5.2.9 The vent lines on all petrol installations shall incorporate a f lame arrester device that fulfils the

requirements in 4.1.7 and 5.2.3, unless the vent is included as part of a combination vent and fill fitting.

5.2.10 For vent-line components in engine compartments, with the ability to capture fuel, the fire test

requirements in 4.1.9 apply.
5.3 Fuel distribution, return and balancing lines

5.3.1 Metal fuel lines shall be made of seamless annealed copper or copper–nickel or equivalent metal

with a nominal wall thickness of at least 0,8 mm. Aluminium lines may be used for diesel.

5.3.2 Rigid fuel lines shall be connected to the engine by a flexible hose section. Support shall be

provided within 100 mm of the connection to the metal supply line on the rigid side of the connection.

5.3.3 Connections in rigid fuel lines shall be made with screwed, compression, cone, brazed or

flanged joints.

5.3.4 Flexible fuel hoses shall be used where relative movement of the craft structures supporting the

fuel lines would be anticipated during normal operating conditions.
5.3.5 Flexible fuel hoses shall be accessible for inspection and maintenance.
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5.3.6 Petrol hoses shall be fire-resistant, type A1, A2 or A15 hoses in accordance with ISO 7840:2013,

except hoses entirely within the splash well at the stern of the craft connected directly to an outboard

engine, which shall be type B1, B2, or B15 hoses in accordance with ISO 8469:2013 or A1, A2 orA15

hoses in accordance with ISO 7840:2013.

NOTE Hoses according to SAE J1527 will satisfy the requirements in ISO 7840 except marking.

5.3.7 Diesel hoses shall be fire-resistant, type A1, A2, or A15 hoses in accordance with ISO 7840:2013.

5.3.8 Fuel lines shall be properly supported and secured to the craft structure above bilge water level,

unless specifically designed for immersion or protected from the effects of immersion.

5.3.9 There shall be no joints in fuel pipes or hoses other than those required to connect required fuel-

line components, e.g. filters and bulkhead connections.

5.3.10 Petrol line systems shall be designed or installed to prevent fuel siphoning out of the tank(s)

following a failure in the system. The following examples illustrate how this can be achieved:

— routing all parts of fuel lines, from which an assumed leakage can enter the craft, above the level of

the tank top when the craft is in its static floating position, including fuel-containing parts on the

engine; or

— fitting an anti-siphon valve (3.4) as close as practical to the tank fittings with a rated siphon-

protection head greater than that required to avoid the siphon effect; or

— fitting a manual shut-off valve as close as practical to the tank – which shall be capable of being

closed from an indicated accessible location outside the engine compartment – in a position that is

self-draining from the valve to the tank; or

— fitting an electrically operated valve as close as practical to the tank withdrawal fitting which is

activated to open only when the engine is running or the starting device is operated. A momentary

override type is acceptable for starting.

5.3.11 Diesel line systems shall be designed or installed to prevent fuel siphoning out of the tank(s)

following a failure in the system. The following examples illustrate how this can be achieved:

— meet the requirements of 5.3.10, or

— be fitted with a manual shut-off valve as close as practical to the tank. This valve shall be capable of

being closed from an indicated accessible location outside the engine compartment. If electrically

operated valves are used, they shall be equipped with a manual emergency operating or by-

passing device.

5.3.12 Diverting valves in diesel return lines shall ensure that the return line f low is not restricted.

5.4 Hose fittings and hose clamping

5.4.1 Fuel hoses shall be secured to the pipe, spud or fitting by metal hose clamps or be equipped with

permanently attached end fittings such as a swaged sleeve or a sleeve and threaded insert.

5.4.2 Pipes, spuds or other fittings for hose connection with hose clamps shall have a bead, flare, series of

annular grooves or serrations. The fuel-tank spud constitutes an exception to this requirement. Continuous

helical threading knurls or grooves, which can provide a path for fuel leakage, shall not be used.

5.4.3 Spuds or other fittings for hose connection with hose clamps shall have a nominal outer diameter

which is the same as the nominal inner diameter of the hose, and should be chosen from a series of

preferred numbers, e.g. 3,2; 4; 5; 6,3; 8; 10; 12,5; 16; 20; 25; 31,5; 40; 50; 63.

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5.4.4 Hose connections designed for a clamp connection shall have a spud at least 25 mm long.

5.4.5 Hose connections having a nominal diameter of more than 25 mm shall have two hose clamps.

The spud shall be at least 35 mm long, to provide space for the clamps.

5.4.6 Spuds intended for hose connection shall be free from sharp edges that could cut or abrade

the hose.

5.4.7 Hose clamps shall be made of CrNi 18-8 stainless steel, or equivalent, and be reusable. Clamps

depending solely on spring tension shall not be used. The nominal clamp band width shall be at least

8 mm for nominal outside hose diameters up to and including 25 mm and at least 10 mm for bigger

hoses. Clamps shall be of the correct size and shall be fitted according to the clamp manufacturer’s

requirements.

5.4.8 Clamps shall be installed to fit directly on the hose and shall not overlap each other. Clamps shall

be installed behind the bead, if any, or fully on the serrations on spuds at least one clamp width from the

end of the hose.
5.5 Valves and fittings

5.5.1 Manually operated valves shall be designed with positive stops in the open and closed positions

or shall clearly indicate their open and closed positions.

5.5.2 The integrity and tightness of a valve shall not depend solely on spring tension.

5.5.3 Threaded valve housing covers that can be exposed to an opening torque when the valve is

operated shall be secured against unintentional opening by a device that can be reused.

5.5.4 If a transparent tubular or flat glass column-type sight gauge is installed (only allowed in diesel

tanks), it shall be as close as practical to the tank, protected to minimize the risk of physical damage, and

...

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