FprEN ISO 24806
(Main)Recreational diving services - Requirements for rebreather diver training - Decompression diving to 60 m (ISO/FDIS 24806:2023)
Recreational diving services - Requirements for rebreather diver training - Decompression diving to 60 m (ISO/FDIS 24806:2023)
This document specifies requirements for rebreather diver training programmes which provide the competencies required to perform dives to 60 m with a rebreather requiring mandatory decompression stops using a breathing mixture containing helium. This document specifies evaluation criteria for these competencies.
This document specifies the requirements under which training is provided, in addition to the general requirements for recreational diving service provision in accordance with ISO 24803.
Dienstleistungen des Freizeittauchens - Anforderungen an die Ausbildung von Kreislaufgerätetauchenden - Dekompressionstauchen bis 60 m (ISO/FDIS 24806:2023)
Dieses Dokument legt Anforderungen für Ausbildungsprogramme für Kreislaufgerätetauchende fest, die die erforderlichen Kompetenzen vermitteln, um Tauchgänge bis 60 m mit einem Kreislaufgerät unter Verwendung eines heliumhaltigen Atemgasgemisches durchzuführen, die obligatorische Dekompressionsstopps erfordern.
Dieses Dokument legt Bewertungskriterien für diese Kompetenzen fest.
Dieses Dokument legt die Anforderungen fest, unter denen die Ausbildung zusätzlich zu den allgemeinen Anforderungen für die Erbringung von Dienstleistungen im Bereich des Freizeittauchens nach ISO 24803 durchgeführt wird.
Services relatifs à la plongée de loisirs - Exigences concernant la formation des plongeurs à l’utilisation des recycleurs - Plongée avec décompression jusqu’à 60 m (ISO/FDIS 24806:2023)
Storitve rekreativnega potapljanja - Zahteve za usposabljanje rekreativnih potapljačev - Dekompresijsko potapljanje do 60 m (ISO/FDIS 24806:2023)
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN ISO 24806:2022
01-oktober-2022
Storitve rekreativnega potapljanja - Zahteve za usposabljanje rekreativnih
potapljačev - Dekompresijsko potapljanje do 60 m (ISO/DIS 24806:2022)
Recreational diving services - Requirements for rebreather diver training -
Decompression diving to 60 m (ISO/DIS 24806:2022)
Dienstleistungen des Freizeittauchens - Anforderungen an die Ausbildung von
Kreislaufgerätetauchern - Dekompressionstauchen bis 60m (ISO/DIS 24806:2022)
Services relatifs à la plongée de loisirs - Exigences concernant la formation des
plongeurs à l’utilisation des recycleurs - Plongée avec décompression jusqu’à 60 m
(ISO/DIS 24806:2022)
Ta slovenski standard je istoveten z: prEN ISO 24806
ICS:
03.080.99 Druge storitve Other services
03.200.99 Drugi standardi v zvezi s Other standards relating to
prostim časom in turizmom leisure and tourism
oSIST prEN ISO 24806:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN ISO 24806:2022
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oSIST prEN ISO 24806:2022
DRAFT INTERNATIONAL STANDARD
ISO/DIS 24806
ISO/TC 228 Secretariat: UNE
Voting begins on: Voting terminates on:
2022-09-01 2022-11-24
Recreational diving services — Requirements for
rebreather diver training — Decompression diving to 60 m
ICS: 03.080.30; 03.200.99; 03.100.30
This document is circulated as received from the committee secretariat.
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
ISO/CEN PARALLEL PROCESSING
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
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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 24806:2022(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
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PROVIDE SUPPORTING DOCUMENTATION. © ISO 2022
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oSIST prEN ISO 24806:2022
ISO/DIS 24806:2022(E)
DRAFT INTERNATIONAL STANDARD
ISO/DIS 24806
ISO/TC 228 Secretariat: UNE
Voting begins on: Voting terminates on:
Recreational diving services — Requirements for
rebreather diver training — Decompression diving to 60 m
ICS: 03.080.30; 03.200.99; 03.100.30
This document is circulated as received from the committee secretariat.
COPYRIGHT PROTECTED DOCUMENT
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
© ISO 2022
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All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
NOT BE REFERRED TO AS AN INTERNATIONAL
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WHICH REFERENCE MAY BE MADE IN
Reference number
Email: copyright@iso.org
NATIONAL REGULATIONS.
Website: www.iso.org ISO/DIS 24806:2022(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
Published in Switzerland
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
ii
© ISO 2022 – All rights reserved
PROVIDE SUPPORTING DOCUMENTATION. © ISO 2022
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oSIST prEN ISO 24806:2022
ISO/DIS 24806:2022(E)
Contents Page
Foreword .v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Competencies . 4
5 Prerequisites for training . 4
5.1 General . 4
5.2 Minimum age . 4
5.3 Diving experience . 4
5.4 Health requirements . 5
6 Introductory information . 5
7 Theoretical knowledge . 5
7.1 Knowledge review . 5
7.2 Rebreather basics. 5
7.3 Function of rebreather components . 5
7.4 Breathing performance using a rebreather . 6
7.5 Rebreather assembly and checks . 6
7.6 Gas supply duration . 7
7.7 CO absorbent duration . 7
2
7.8 Rebreather pre-water entry checks . 7
7.9 Advanced decompression dive planning . 8
7.10 Dive conduct . 8
7.11 Identifying and reacting to potential issues . 9
7.12 Hypercapnia, hypoxia, and hyperoxia . 10
7.13 Buddy and team diving procedures . 10
7.14 Rebreather maintenance . 11
7.15 Maintaining knowledge and skills . 11
8 Practical skills .11
8.1 Skills review . 11
8.2 General . 11
8.3 Pre-dive procedures . 11
8.4 Dive conduct .12
8.5 Emergency situations .13
8.6 Response to rebreather malfunctions . 13
8.7 Post dive procedures . 14
9 Instructors .14
10 Training equipment and materials .14
10.1 Training equipment . 14
10.2 Training materials . 15
11 Practical training parameters .15
11.1 Training dives or in-water sessions . 15
11.2 Instructor responsibilities . 15
11.3 Rebreather dive leaders . 16
11.4 Breathing gas limits . 16
11.4.1 Closed-circuit rebreather . 16
11.4.2 Semiclosed-circuit rebreather. 16
12 Evaluation .17
12.1 Knowledge . 17
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oSIST prEN ISO 24806:2022
ISO/DIS 24806:2022(E)
12.2 Skill evaluation . 17
12.3 Proof of qualification . 17
Annex A (informative) Gas density and gas mixtures .18
Annex B (normative) Student crossover training programmes .19
Bibliography .20
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oSIST prEN ISO 24806:2022
ISO/DIS 24806:2022(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 228, Tourism and related services.
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.
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oSIST prEN ISO 24806:2022
ISO/DIS 24806:2022(E)
Introduction
Rebreathers (i.e. breathing devices that recirculate some or all of the diver’s exhaled breath and
replenish any consumed oxygen to maintain a breathable mixture) are becoming much more widely
available and popular among divers. The market for rebreather diving has been constantly growing
in recent years and is now considered to be large enough that the need for standards for training
organizations on minimum training requirements is evident. Rebreathers allow divers to dive
longer and to greater depths. Such depths can go beyond 30 m and may therefore require mandatory
decompression stops. If rebreathers are used improperly they can be hazardous; divers have had fatal
accidents due to incorrect use of these devices. It is therefore important to specify training for diving
with such devices.
Training organizations offering training that conforms with this document may exceed any of the
requirements in terms of the volume or complexity of training but should at least ensure the students
master all the skills and knowledge defined in this document.
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oSIST prEN ISO 24806:2022
DRAFT INTERNATIONAL STANDARD ISO/DIS 24806:2022(E)
Recreational diving services — Requirements for
rebreather diver training — Decompression diving to 60 m
1 Scope
This document specifies requirements for rebreather diver training programmes which provide the
competencies required to perform dives to 60 m with a rebreather using a breathing mixture containing
helium requiring mandatory decompression stops.
This document specifies evaluation criteria for these competencies.
This document specifies the requirements under which training is provided, in addition to the general
requirements for recreational diving service provision in accordance with ISO 24803.
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 24802-2, Recreational diving services — Requirements for the training of scuba instructors — Part 2:
Level 2
ISO 24803, Recreational diving services — Requirements for recreational diving providers
ISO/FDIS 24805, Recreational diving services — Requirements for rebreather diver training —
Decompression diving to 45 m
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 https:// www .electropedia .org/
3.1
rebreather
apparatus that has a supply of gas carried by the diver, allowing the diver to breathe under water
which enables the diver to inspire gas from a facepiece connected to a counterlung and to pass exhaled
gas through a carbon dioxide absorption material before it is re-breathed from the counterlung and
inspired partial pressure of the gases within the apparatus remain within acceptable physiological
limits so that gas is thus recirculated within the apparatus
Note 1 to entry: A rebreather can also be called a self-contained rebreathing apparatus.
Note 2 to entry: A facepiece can be a mouthpiece assembly, a half mask, a full-face mask or a helmet.
[SOURCE: EN 14143:2013, 3.1, modified — Note 1 to entry modified and Note 2 to entry added. This
content has been reproduced with the permission of CEN. Copyright remains with CEN.]
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oSIST prEN ISO 24806:2022
ISO/DIS 24806:2022(E)
3.2
rebreather type
primary rebreather design
EXAMPLE Closed-circuit rebreather (CCR), manually controlled closed-circuit rebreather (mCCR),
electronically controlled closed-circuit rebreather (eCCR), semiclosed-circuit rebreather (SCR), manually
controlled SCR (mSCR), electronically controlled SCR (eSCR), hybrid closed-circuit rebreather (hCCR)
3.3
rebreather unit
type of rebreather (3.1) having consistent controls, displays and configuration over several rebreather
models (3.4) where the operation is essentially the same from rebreather model to rebreather model
3.4
rebreather model
specific individual design of rebreather (3.1) made by a manufacturer
3.5
breathing gas
gas present in the breathing loop (3.14) inspired by the diver
3.6
supply gas
gas present in a cylinder which may be added to the breathing loop (3.14)
3.7
bailout gas
gas present in a cylinder that may be breathed directly by the diver
3.8
nitrox
breathable mixture of nitrogen and oxygen with more than 21 % oxygen content, which may contain
trace gases at levels no higher than those found in normal air
[SOURCE: ISO 11107:2009, 3.5]
3.9
trimix
gas comprising a specified mixture of oxygen, helium and nitrogen, capable of supporting human life
under appropriate diving or hyperbaric conditions
Note 1 to entry: This includes manufactured gas mixtures made up from combinations of pure oxygen, pure
helium and pure nitrogen, with or without compressed air.
[SOURCE: EN 14143:2013, 3.20 — This content has been reproduced with the permission of CEN.
Copyright remains with CEN.]
3.10
heliox
gas comprising a specified mixture of oxygen and helium, capable of supporting human life under
appropriate diving or hyperbaric conditions
3.11
PO
2
partial pressure of oxygen in a gas mixture
Note 1 to entry: This usually refers specifically to the breathing-gas mixture inhaled by a diver.
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oSIST prEN ISO 24806:2022
ISO/DIS 24806:2022(E)
3.12
set-point
PO setpoint
2
PO value that is used by a control system to determine when a solenoid valve injects oxygen into the
2
breathing loop (3.14)
3.13
respiratory minute volume
RMV
product of the tidal volume and breathing frequency measured in litres per minute
[SOURCE: EN 14143:2013, 3.10 — This content has been reproduced with the permission of CEN.
Copyright remains with CEN.]
3.14
breathing loop
portion of a rebreather (3.1) through which gas circulates, usually consisting of a mouthpiece, breathing
hose(s), counterlung(s), non-return valves and a CO absorbent canister
2
3.15
scrubber
canister in the breathing loop (3.14) containing CO absorbent
2
3.16
confined water
swimming pool with a depth appropriate to the activity or body of water, offering similar conditions
with regard to visibility, depth, water movement and access
[SOURCE: ISO 24801-2:2014, 3.5]
3.17
open water
body of water significantly larger than a swimming pool, offering conditions typical of a natural body
of water
[SOURCE: ISO 24801-2:2014, 3.6]
3.18
limited open water
open water (3.17) no deeper than 20 metres with no appreciable water movement, and visibility that is
sufficient to allow effective student supervision and skill development
3.19
service provider
entity (individual or organization), including any individual acting on behalf such an entity, which offers
one or more of the following services:
— introductory diving activities;
— snorkelling excursions;
— provision of training and education;
— organized and guided diving for qualified divers;
— rental of diving equipment.
[SOURCE: ISO 24803:2017-03, 3.1]
3.20
safety stop
non-mandatory decompression stop (3.21) near the surface prior to surfacing
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oSIST prEN ISO 24806:2022
ISO/DIS 24806:2022(E)
3.21
decompression stop
mandatory stop during ascent from depth prior to surfacing
3.22
no-decompression diving
diving without requiring mandatory decompression stops (3.21)
3.23
decompression diving
diving with mandatory decompression stops (3.21)
3.24
delayed surface marker buoy
DSMB
surface marker buoy that can be deployed by a diver from underwater
4 Competencies
The training programme shall ensure that students are qualified to independently plan and conduct
dives requiring mandatory decompression stops using the specific rebreather unit for which the diver
has received training.
Divers qualified in accordance with this document are competent to dive with a suitably qualified
buddy to 60 m using a rebreather with a supply gas containing
— a minimum of 15 % oxygen; and
— sufficient helium to control narcosis and to ensure a breathing gas density of less than 6,3 g/l.
In order to be deemed qualified to dive with a specific rebreather unit other than the one that the diver
has received initial training for, a diver will need further unit specific training.
The training program shall ensure that the student has a full understanding of any theoretical concepts
or skills applicable to the rebreather type, rebreather unit and rebreather model they will use. Students
shall be provided with an overview of any information that is not specific to their rebreather, but this
only needs to be informative in nature so that they are aware of the general possible configurations
that other divers may use.
5 Prerequisites for training
5.1 General
The service provider shall ensure that the student fulfils the following prerequisites to take part in the
training course envisaged.
In order to participate in a training programme in accordance with this document, students shall be
qualified in accordance with ISO 24805.
5.2 Minimum age
The minimum age to participate in a training programme in accordance with this document shall be
18 years.
5.3 Diving experience
Students shall have logged at least 50 dives with a minimum of 50 h using a rebreather. At least 25
logged dives and 25 h shall have been made with the same specific rebreather unit to be used in the
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oSIST prEN ISO 24806:2022
ISO/DIS 24806:2022(E)
course. A minimum of ten rebreather dives shall have been made to a depth of at least 30 m requiring
staged decompression.
5.4 Health requirements
Documented evidence shall be obtained that the student has been medically screened as suitable for
recreational diving by means of an appropriate questionnaire or medical examination.
NOTE See Reference [2] for an example of a medical questionnaire and accompanying guidance to physicians.
In case of doubt, the training service provider shall refer students to proper medical resources. If the
student is not examined by a physician, the student shall be obliged to confirm by signature that he or
she has understood written information given by the instructor on diseases and physical conditions
which can pose diving-related risks.
Students shall be advised of the importance of appropriate regular medical examinations.
6 Introductory information
Information in accordance with ISO 24803 shall be made available to the students prior to, or during
the first class or meeting.
In particular the students shall be informed of the limits of their training and qualification as specified
in accordance with Clause 4.
7 Theoretical knowledge
7.1 Knowledge review
The training programme shall ensure that knowledge in accordance with ISO 24805 is reviewed by
assessing the students (e.g. by means of an exam or quiz) before teaching new knowledge. Where
knowledge gaps are identified remedial training shall be carried out.
7.2 Rebreather basics
The training programme shall ensure that students have knowledge concerning the following,
specifically relating to decompression dives to 60 m:
— advantages and limitations of different rebreather types;
— the concept of rebreather unit-specific requirements;
— maintaining PO within physiological limits.
2
7.3 Function of rebreather components
The training programme shall ensure that students have knowledge concerning the function of the
following components of a rebreather, with emphasis on the specific features of the rebreather unit
they will use during their training, specifically relating to decompression dives to 60 m:
— scrubber (CO absorbent);
2
— gas supplies (this shall include where applicable: oxygen, diluent or other supply gases);
— gas addition valves (this shall include where applicable: manual, automatic diluent valve (ADV) or
other automatic gas addition);
— mouthpiece, dive surface valve (DSV);
5
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