EN ISO 15138:2007

SLOVENSKI STANDARD
01-april-2008
1DGRPHãþD
SIST EN ISO 15138:2001
SIST EN ISO 15138:2001/AC:2004
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SUH]UDþHYDQMHLQNOLPDWL]DFLMD,62
Petroleum and natural gas industries - Offshore production installations - Heating,
ventilation and air-conditioning (ISO 15138:2007)
Erdöl- und Erdgasindustrie - Offshore-Produktionsanlagen - Heizung, Lüftung und
Klimatisierung (ISO 15138:2007)
Industries du pétrole et du gaz naturel - Installations en mer - Chauffage, ventilation et
climatisation (ISO 15138:2007)
Ta slovenski standard je istoveten z: EN ISO 15138:2007
ICS:
75.180.10 Oprema za raziskovanje in Exploratory and extraction
odkopavanje equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 15138
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2007
ICS 75.180.10 Supersedes EN ISO 15138:2000
English Version
Petroleum and natural gas industries - Offshore production
installations - Heating, ventilation and air-conditioning (ISO
15138:2007)
Industries du pétrole et du gaz naturel - Plates-formes de Erdöl- und Erdgasindustrie - Offshore-Produktionsanlagen -
production en mer - Chauffage, ventilation et climatisation Heizung, Lüftung und Klimatisierung (ISO 15138:2007)
(ISO 15138:2007)
This European Standard was approved by CEN on 14 December 2007.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2007 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 15138:2007: E
worldwide for CEN national Members.

Contents Page
Foreword.3

Foreword
This document (EN ISO 15138:2007) has been prepared by Technical Committee ISO/TC 67 "Materials,
equipment and offshore structures for petroleum and natural gas industries" in collaboration with Technical
Committee CEN/TC 12 "Materials, equipment and offshore structures for petroleum, petrochemical and
natural gas industries", the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by June 2008, and conflicting national standards shall be withdrawn at
the latest by June 2008.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 15138:2000.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 15138:2007 has been approved by CEN as a EN ISO 15138:2007 without any modification.

DRAFT INTERNATIONAL STANDARD ISO/DIS 15138
ISO/TC 67/SC 6 Secretariat: AFNOR
Voting begins on: Voting terminates on:
2006-09-21 2007-02-21
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION • МЕЖДУНАРОДНАЯ ОРГАНИЗАЦИЯ ПО СТАНДАРТИЗАЦИИ • ORGANISATION INTERNATIONALE DE NORMALISATION
Petroleum and natural gas industries — Offshore production
installations — Heating, ventilation and air-conditioning
Industries du pétrole et du gaz naturel — Installations en mer — Chauffage, ventilation et climatisation
[Revision of first edition (ISO 15138:2000) and of ISO 15138/Cor.1:2001]
ICS 75.180.10
ISO/CEN PARALLEL ENQUIRY
The CEN Secretary-General has advised the ISO Secretary-General that this ISO/DIS covers a subject
of interest to European standardization. In accordance with the ISO-lead mode of collaboration as
defined in the Vienna Agreement, consultation on this ISO/DIS has the same effect for CEN
members as would a CEN enquiry on a draft European Standard. Should this draft be accepted, a
final draft, established on the basis of comments received, will be submitted to a parallel two-month FDIS
vote in ISO and formal vote in CEN.
In accordance with the provisions of Council Resolution 15/1993 this document is circulated in
the English language only.
Conformément aux dispositions de la Résolution du Conseil 15/1993, ce document est distribué
en version anglaise seulement.
To expedite distribution, this document is circulated as received from the committee secretariat.
ISO Central Secretariat work of editing and text composition will be undertaken at publication
stage.
Pour accélérer la distribution, le présent document est distribué tel qu'il est parvenu du
secrétariat du comité. Le travail de rédaction et de composition de texte sera effectué au
Secrétariat central de l'ISO au stade de publication.
THIS DOCUMENT IS A DRAFT CIRCULATED 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 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 NATIONAL REGULATIONS.
© International Organization for Standardization, 2006

ISO/DIS 15138
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ii ISO 2006 – All rights reserved

ISO/DIS 15138
Contents Page
Foreword.vi
1 Scope .1
2 Normative references.1
3 Terms and definitions .1
4 Abbreviated terms.2
5 Design .4
5.1 Introduction.4
5.2 Development of design basis.6
5.2.1 Orientation and layout.6
5.2.2 Hazardous area classification and the role of HVAC .6
5.2.3 Environmental conditions.6
5.2.4 Natural/mechanical ventilation.7
5.2.5 Selection of controls philosophy .7
5.2.6 Operating and maintenance philosophy .8
5.2.7 Materials and corrosion.8
5.2.8 Design margins and calculations .8
5.2.9 Wind tunnel and CFD modelling.9
5.2.10 Performance standards.9
5.3 System design — General.9
5.3.1 Natural ventilation.9
5.3.2 Mechanical ventilation. 10
5.3.3 Secondary ventilation systems. 11
5.4 Area-specific system design . 11
5.4.1 Process and utility areas. 11
5.4.2 Living quarters . 11
5.4.3 Drilling and drilling utility areas. 12
5.4.4 Gas turbine enclosures. 12
5.4.5 Emergency plant ventilation. 12
5.4.6 Battery and charger rooms. 13
5.4.7 Laboratories. 13
5.4.8 Purge air systems. 13
5.4.9 Rooms protected by gaseous extinguishing agents. 13
5.4.10 Engine-room ventilation . 13
5.4.11 Watertight compartments. 14
Annex A (informative) Guidance to 5 Design . 15
A.1 Guidance to 5.2.1 Orientation and Layout . 15
A.2 Guidance to 5.2.2 Hazardous area classification and the role of HVAC . 16
A.3 Guidance to 5.2.3 Environmental conditions. 16
A.3.1 External meteorological conditions. 16
A.3.2 Maximum sea temperature . 18
A.3.3 Direct and diffuse solar radiation intensities. 18
A.3.4 Internal environmental conditions. 18
A.4 Guidance to 5.2.4 Natural/mechanical ventilation . 20
A.5 Guidance to 5.2.5 Selection of controls philosophy . 20
A.5.1 General. 20
A.5.2 HVAC shut down philosophy . 21
A.5.3 Control and monitoring — Normal operation . 21
A.5.4 Control and monitoring — Emergency conditions. 23
A.6 Guidance to 5.2.6 Operating and maintenance philosophy. 24
ISO/DIS 15138
A.7 Guidance to 5.2.7 Materials and corrosion .25
A.8 Guidance to 5.2.8 Design margins and calculations.26
A.9 Guidance to 5.2.9 Wind tunnel and CFD modelling .27
A.9.1 General.27
A.9.2 Computational Fluid Dynamics: Preparation for Analysis.27
A.9.3 Computational Fluid Dynamics: Analysis.28
A.10 Guidance to 5.2.10 Performance standards.30
A.11 Guidance to 5.3.1 Natural ventilation.32
A.12 Guidance to 5.3.2 Mechanical ventilation .32
A.12.1 General.32
A.12.2 Differential pressure .33
A.12.3 Effect of wind.33
A.12.4 Inlets and outlets.33
A.12.5 Duct systems.33
A.13 Guidance to 5.3.3 Secondary ventilation systems.34
A.14 Guidance to 5.4.1 Process and utility areas.34
A.15 Guidance to 5.4.2 Living quarters.35
A.15.1 General.35
A.15.2 Extract system.35
A.15.3 Heating, cooling and humidification.36
A.15.4 Galley systems.36
A.15.5 Laundry systems.36
A.15.6 Temporary modules.37
A.15.7 Temporary refuge (TR) .37
A.16 Guidance to 5.4.3 Drilling and drilling utility areas.37
A.16.1 General.37
A.16.2 Shale shaker units and cutting cleaning units.38
A.16.3 Mud tanks.38
A.16.4 Air cleaners .39
A.16.5 Cement units .39
A.17 Guidance to 5.4.4 Gas turbine enclosures.39
A.18 Guidance to 5.4.5 Emergency plant ventilation .40
A.19 Guidance to 5.4.6 Battery and charger rooms.40
A.20 Guidance to 5.4.7 Laboratories.40
A.21 Guidance to 5.4.8 Purge air systems.41
A.22 Guidance to 5.4.9 Rooms protected by gaseous extinguishing agents.41
A.23 Guidance to 5.4.11 Watertight Compartments.41
Annex B (informative) Equipment and bulk selection .42
B.1 General.42
B.2 Louvres.42
B.2.1 Function .42
B.2.2 Guidance .42
B.3 Moisture separators and filters.43
B.3.1 Function .43
B.3.2 Guidance .43
B.4 Heating coils and unit heaters.44
B.4.1 Function .44
B.4.2 Guidance .45
B.5 Cooling coils and fan coil units .46
B.5.1 Function .46
B.5.2 Guidance .46
B.6 Humidifiers .47
B.6.1 Function .47
B.6.2 Guidance .47
B.7 Fans.48
B.7.1 Function .48
B.7.2 Guidance .48
B.8 Sound attenuation .49
B.8.1 Function .49
iv © ISO 2006 – All rights reserved

ISO/DIS 15138
B.8.2 Guidance . 49
B.9 Fire dampers . 50
B.9.1 Function . 50
B.9.2 Guidance . 50
B.10 General dampers. 51
B.10.1 Function . 51
B.10.2 Guidance . 52
B.11 Grilles and diffusers. 53
B.11.1 Function . 53
B.11.2 Guidance . 53
B.12 Air handling units (AHUs). 54
B.12.1 Function . 54
B.12.2 Guidance . 54
B.13 Refrigeration packages. 57
B.13.1 Function . 57
B.13.2 Guidance . 57
B.14 Constant-volume terminal reheat units (CVUs) . 59
B.14.1 Function . 59
B.14.2 Guidance . 59
B.15 Dehumidifiers. 60
B.15.1 Function . 60
B.15.2 Guidance . 60
B.16 Ducts. 61
B.16.1 Function . 61
B.16.2 Guidance . 61
Annex C (informative) Installation and commissioning guidance . 63
C.1 Installation. 63
C.1.1 Joints . 63
C.1.2 Hangers and supports. 63
C.1.3 Equipment installation . 64
C.1.4 Duct insulation . 64
C.1.5 Insulation jacketing . 64
C.1.6 Identification . 66
C.1.7 Cleaning and protection . 66
C.1.8 Leakage testing . 67
C.2 Commissioning . 67
Annex D (informative) Operation and maintenance . 68
D.1 General. 68
D.2 Loss or reduction of ventilation . 68
D.3 Routine operational checks. 70
Annex E (informative) Data sheets. 71
Annex F (informative) Flange standard . 105
Bibliography. 107

ISO/DIS 15138
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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. 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.
ISO 15138 was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore structures
for petroleum and natural gas industries, Subcommittee SC 6, Processing equipment and systems.
This second edition cancels and replaces the first edition (ISO 15138, First edition 2000-11-01). The standard
has been technically revised.
Annexes A through F of this International Standard are for information only.
vi © ISO 2006 – All rights reserved

ISO/DIS 15138
Petroleum and natural gas industries — Offshore production
installations — Heating, ventilation and air-conditioning
1 Scope
This International Standard specifies requirements and provides guidance for design, testing, installation and
commissioning of heating, ventilation, air-conditioning and pressurization systems and equipment on all offshore
production installations for the petroleum and natural gas industries which are:
¾ new and existing;
¾ normally occupied by personnel and not normally occupied by personnel;
¾ fixed or floating but registered as an offshore production installation.
NOTE For installations that could be subject to "Class" or "IMO/MODU Codes & Resolutions", the user is referred to HVAC
requirements under these rules and resolutions. Should these requirements be of a lesser degree than those being considered for a
fixed installation, then this International Standard, i.e. requirements for fixed installation, should be utilized.
2 Normative references
The following referenced document is indispensable for the application of this document. For dated references, only the
edition cited applies. For undated references, the latest edition of the referenced standard (including any amendments)
applies.
ISO 8861, Shipbuilding — Engine-room ventilation in diesel-engined ships — Design requirements and basis of
calculations.
ISO 13702, Petroleum and natural gas industries — Control and mitigation of fires and explosions on offshore production
installations — Requirements and guidelines
IEC 60079-10, Electrical apparatus for explosive gas atmospheres — Part 10: Classification of hazardous areas.
3 Terms and definitions
For the purposes of this International Standard, the following terms and definitions apply.
3.1
adequate ventilation
reference is made to the classification code
3.2
displacement ventilation
movement of air within a space in piston- or plug-type motion
NOTE No mixing of room air occurs in ideal displacement flow, which is desirable for removing pollutants generated within a
space.
ISO/DIS 15138
3.3
fixed offshore installation
all facilities located and installed on fixed offshore structures, which are provided to extract oil and gas hydrocarbons
from subsea oil and gas reservoirs
3.4
fixed offshore structure
structure permanently fixed to or located on the sea bed, including moored ships and hulls, which is held in position by
anchors or tensioned cables and is provided to (structurally) support topsides facilities
NOTE Vessels and drilling rigs, etc. which are in transit or engaged in exploration and appraisal activities are specifically excluded
from this definition.
3.5
fugitive emission
emission which is always present on a molecular scale from all potential leak sources in a plant under normal operating
conditions
NOTE As a practical interpretation, a fugitive emission is one which cannot be detected by sight, hearing or touch but may be
detected using bubble-test techniques or tests of a similar sensitivity.
3.6
open area
area in an open-air situation where vapours are readily dispersed by wind
NOTE Typical air velocities in such areas should rarely be less than 0,5 m/s and should frequently be above 2 m/s.
3.7
temporary refuge
TR
place where personnel can take refuge for a pre-determined period whilst investigations, emergency response and
evacuation pre-planning are undertaken
[ISO 13702:1999, definition 2.1.52]
3.8
stagnant area
area where the ventilation rate is less than adequate
4 Abbreviated terms
AC Alternating Current
AC/h Air Changes per hour
AHU Air Handling Unit
AMCA Air Movement and Control Association Inc.
API American Petroleum Institute
ASHRAE American Society of Heating, Refrigerating and Air-Conditioning Engineers
BS British Standard
CCR Central Control Room
CFD Computational Fluid Dynamics
2 © ISO 2006 – All rights reserved

ISO/DIS 15138
CIBSE Chartered Institution of Building Services
CMS Control and Monitoring System
CVU Constant-Volume Terminal Reheat Unit
DC Direct Current
DE Driven End
DX Direct Expansion
EN European Standard
ESD Emergency Shutdown
F&G Fire and Gas
GWP Global Warming Potential
HAZOP Hazard and Operability Study
HSE Health, Safety and Environment
HVAC Heating, Ventilation and Air Conditioning
HVCA Heating and Ventilating Contractors' Association
IEC International Electrotechnical Commission
IMO International Maritime Organization
IP Institute of Petroleum
IP Integrity Protection
LFL Lower Flammable Limit
LQ Living Quarters
MODU Mobile Offshore Drilling Unit
NDE Non-driven End
NFPA National Fire Protection Association
NS Norsk Standard (Norwegian Standard)
ODP Ozone Depletion Potential
QRA Quantitative Risk Analysis
r.m.s. Root mean square
ISO/DIS 15138
5 Design
5.1 Introduction
Clause 5 together with annex A provide requirements and guidance on all aspects of the design of heating, ventilation
and air-conditioning (HVAC) systems for offshore installations for the petroleum and natural gas industries.
For guidance on air change rates and pressurization requirements reference is made to classification codes for the
specific project.
The HVAC systems form part of the safety services of the installation. The safety goals are to:
¾ prevent, through pressurization, the ingress of potentially flammable gas -air mixtures into all designated non-
hazardous areas;
¾ prevent the formation of potentially hazardous concentrations of flammable gaseous mixtures in hazardous areas by
provision of sufficient ventilation for the dilution, dispersion and removal of such mixtures;
¾ maintain ventilation to all equipment and areas/rooms which are required to be operational during an emergency
when the main source of power is unavailable;
¾ provide a controlled environment in which personnel, plant and systems can operate effectively, including smoke
control.
These high-level goals are supported by lower-level goals of a functional nature which are stated later in the appropriate
sections of this document.
Clause 5.2 concentrates on functional requirements in the development of a basis of design for either a new project or
major modification to an existing installation. The requirements are related to:
a) platform orientation and layout (5.2.1);
b) hazard identification and hazardous area classification (5.2.2);
c) environmental conditions (5.2.3);
d) choice of natural or mechanical ventilation systems (5.2.4);
e) development of the controls philosophy (5.2.5);
f) operating and maintenance philosophy (5.2.6);
g) material selection (5.2.7);
h) design margins and calculations (5.2.8);
i) design development and validation using wind tunnel testing or Computational Fluid Dynamics (CFD); (item 5.2.9);
Ventilation may be natural (i.e. the wind) or mechanical or a combination of both. Throughout this International Standard,
the use of the term "ventilation" should be taken to include either natural or mechanical ventilation, as appropriate.
Natural ventilation is preferred over mechanical ventilation where practical, since it is available throughout gas
emergencies, does not rely on active equipment and reduces effort required for HVAC maintenance.
For new designs, the development of a design basis may be progressed using the guidance and examples of good
engineering practice that are identified in this document, though it should be recognized that it involves a process of
iteration as the design matures and does not take place as the sequential series of steps used in this document to
facilitate presentation. The processes outlined here are equally applicable to major redevelopments to existing
4 © ISO 2006 – All rights reserved

ISO/DIS 15138
installations, but some compromise may need to be made as a result of historical decisions regarding layout, equipment
selection and the prevailing level of knowledge at the time. The challenge of providing cost-effective solutions in
redevelopment may be significantly greater than for a new design.
The finalized basis of design may be recorded on data sheets such as those provided in annex E.
The completed design should be subject to hazard assessment review. The Hazard and Operability Study (HAZOP)
technique may be used for this.
In 5.2, objectives are identified which establish the goals. Functional requirements are outlined which will enable the
objectives to be achieved. The functional requirements are supported by technical guidance given in annex A, which
discusses the suitability of different techniques for different applications and identifies examples of good engineering
practice or cost-effective solutions that have been used in some parts of the world. The functional requirements may be
satisfied by other methods not identified in this document, but it is the responsibility of the user to assess whether the
method is technically acceptable and acceptable to the local regulator.
5.3 addresses the fundamental choice in system design, i.e. between natural and mechanical methods of ventilation.
5.4 gives functional requirements associated with the design of HVAC systems for different areas of a typical offshore
installation which require particular technical considerations due to their location and/or their function.
Figure 1 is intended to illustrate the processes undertaken at various stages of the installation life cycle and to identify
reference documents and the appropriate clauses of this International Standard which provide the necessary guidance.
Hazard Define design Produce Construct Commission Operate Enhance Abandon
management basis design facilities
Start
Establish New
E
Set/revise Construct Test Operate
H. S. & E. or existing
management installation performance HVAC and and
system ? standards systems commission maintain
HVAC HVAC
N
Undertake Consider Establish Is
Y
design
hazard evalu- installation controls
requirement
ation and risk orientation philosophy
met ?
management
N
Is
Define Establish
Y
performance
ventilation O and M
standard
philosophy philosophy
met ?
Establish Select Evaluate
environmental materials extent of
conditions non-
compliance
Select Provide Modify Abandon
natural or detailed HVAC HVAC
mechanical design systems systems
ventilation
Finish
Figure 1 — Application of this International Standard to a project life cycle
ISO/DIS 15138
5.2 Development of design basis
5.2.1 Orientation and layout
5.2.1.1 Objective
To provide input into the early stages of design development so that areas and equipment that may have a requirement
for HVAC, or be affected by its provision, are sited in an optimum location, so far as is reasonably practicable.
5.2.1.2 Functional requirements
Installation layout requires a great deal of coordination between the engineers involved during design and the operation,
maintenance and safety specialists. Attention shall also be paid to the minimization of construction, offshore hook-up and
commissioning. It is not the intention of this International Standard to detail a platform-layout philosophy, but to identify
areas where considerations of the role of HVAC, and requirements for it, might have an impact in the decision-making
surrounding installation orientation and layout.
Each installation should have a temporary refuge (TR). The TR should in almost all cases be the LQ, where they are
provided. The survivability of the TR, which is directly related to the air change rate, may introduce consideration of active
HVAC systems for pressurization of the Living Quarters (LQ) or enclosed escape and evacuation routes. Active systems
require detailed risk assessment e
...