SIST EN ISO 10438-4:2008

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SIST EN ISO 10438-4:2008
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Petroleum, petrochemical and natural gas industries - Lubrication, shaft-sealing and
control-oil systems and auxiliaries - Part 4: Self-acting gas seal support systems (ISO
10438-4:2007)
Erdöl-, petrochemische und Erdgasindustrie - Schmieröl-, Sperröl- und
Regelölversorgungsanlagen und Hilfsanlagen - Teil 4: Sperrgasversorgungsanlagen
(ISO 10438-4:2007)
Industries du pétrole, de la pétrochimie et du gaz naturel - Systèmes de lubrification,
systèmes d'étanchéité, systèmes d'huile de régulation et leurs auxiliaires - Partie 4:
Systèmes de soutien pour les étanchéités au gaz auto-actionnées (ISO 10438-4:2007)
Ta slovenski standard je istoveten z: EN ISO 10438-4:2007
ICS:
75.180.20
SIST EN ISO 10438-4:2008 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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EUROPEAN STANDARD
EN ISO 10438-4
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2007
ICS 75.180.20 Supersedes EN ISO 10438-4:2003
English Version
Petroleum, petrochemical and natural gas industries -
Lubrication, shaft-sealing and control-oil systems and auxiliaries
- Part 4: Self-acting gas seal support systems (ISO 10438-
4:2007)
Industries du pétrole, de la pétrochimie et du gaz naturel - Erdöl-, petrochemische und Erdgasindustrie - Schmieröl-,
Systèmes de lubrification, systèmes d'étanchéité, systèmes Sperröl- und Regelölversorgungsanlagen und Hilfsanlagen
d'huile de régulation et leurs auxiliaires - Partie 4: - Teil 4: Sperrgasversorgungsanlagen (ISO 10438-4:2007)
Systèmes de soutien pour les étanchéités au gaz auto-
actionnées (ISO 10438-4:2007)
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 10438-4:2007: E
worldwide for CEN national Members.

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EN ISO 10438-4:2007 (E)
Contents Page
Foreword.3

2

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EN ISO 10438-4:2007 (E)
Foreword
This document (EN ISO 10438-4:2007) 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 10438-4:2003.
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 10438-4:2007 has been approved by CEN as a EN ISO 10438-4:2007 without any
modification.

3

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INTERNATIONAL ISO
STANDARD 10438-4
Second edition
2007-12-15

Petroleum, petrochemical and natural gas
industries — Lubrication, shaft-sealing
and control-oil systems and auxiliaries —
Part 4:
Self-acting gas seal support systems
Industries du pétrole, de la pétrochimie et du gaz naturel — Systèmes
de lubrification, systèmes d'étanchéité, systèmes d'huile de régulation
et leurs auxiliaires —
Partie 4: Systèmes de soutien pour les étanchéités au gaz
auto-actionnées




Reference number
ISO 10438-4:2007(E)
©
ISO 2007

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ISO 10438-4:2007(E)
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©  ISO 2007
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ii © ISO 2007 – All rights reserved

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ISO 10438-4:2007(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms, abbreviated terms and definitions . 1
4 General. 2
4.1 System selection. 2
4.2 Basic design. 2
4.3 Gas filters . 4
4.4 Transfer valves. 4
4.5 Condensate traps. 4
5 Piping and tubing. 5
6 Instrumentation, control and electrical systems. 5
6.1 General. 5
6.2 Alarms and shutdowns . 5
6.3 Instrumentation. 6
7 Inspection, testing and preparation for shipment. 7
7.1 General. 7
7.2 Inspection . 7
7.3 Testing . 7
7.4 Preparation for shipment . 8
8 Vendor's Data. 8
8.1 Proposal. 8
8.2 Spare parts . 8
Annex A (informative) Datasheets . 9
Annex B (informative) Piping and instrument diagrams . 10
Annex C (informative) Inspector's checklist. 25
Annex D (informative) Dry-gas-seal connection terminology and configurations. 27
Bibliography . 30

© ISO 2007 – All rights reserved iii

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ISO 10438-4:2007(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.
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.
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.
ISO 10438-4 was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore structures
for petroleum, petrochemical and natural gas industries, Subcommittee SC 6, Processing equipment and
systems.
This second edition cancels and replaces the first edition (ISO 10438-4:2003), which has been technically
revised.
ISO 10438 consists of the following parts, under the general title Petroleum, petrochemical and natural gas
industries — Lubrication, shaft-sealing and control-oil systems and auxiliaries:
⎯ Part 1: General requirements
⎯ Part 2: Special-purpose oil systems
⎯ Part 3: General-purpose oil systems
⎯ Part 4: Self-acting gas seal support systems
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ISO 10438-4:2007(E)
Introduction
This International Standard was developed jointly with API 614, 5th edition. ISO 10438 is divided into four
parts corresponding to the four chapters of API 614.
Users of this part of ISO 10438 should be aware that further or differing requirements might be needed for
individual applications. This part of ISO 10438 is not intended to inhibit a vendor from offering, or the
purchaser from accepting, alternative equipment or engineering solutions for the individual application. This
may be particularly appropriate where there is innovative or developing technology. Where an alternative is
offered, the vendor should identify any variations from this part of ISO 10438 and provide details. It is intended
that this part of ISO 10438 be used in conjunction with 10438-1.
This part of ISO 10438 requires the purchaser to specify certain details and features.
A bullet (•) at the beginning of a clause or subclause indicates that either a decision is required or further
information is to be provided by the purchaser. This information or decision should be indicated on the
datasheet(s); otherwise it should be stated in the quotation request or in the order.
In this International Standard, US customary (USC) units are included in brackets for information.

© ISO 2007 – All rights reserved v

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INTERNATIONAL STANDARD ISO 10438-4:2007(E)

Petroleum, petrochemical and natural gas industries —
Lubrication, shaft-sealing and control-oil systems and
auxiliaries —
Part 4:
Self-acting gas seal support systems
1 Scope
This part of ISO 10438 in conjunction with ISO 10438-1 specifies requirements for support systems for
self-acting gas seals (dry gas seals), for example as described in ISO 10439 and ISO 10440-1. These
systems can serve equipment such as compressors, gears, pumps and drivers.
NOTE For the purposes of this statement of scope, API 617 is equivalent to ISO 10439 and API 619 is equivalent to
ISO 10440-1.
2 Normative references
The following referenced documents are indispensable for the application 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 10438-1:2007, Petroleum, petrochemical and natural gas industries — Lubrication, shaft-sealing and
control-oil systems and auxiliaries — Part 1: General requirements
ISO 15649, Petroleum and natural gas industries — Piping
API RP 520, Sizing, Selection, and Installation of Pressure-Relieving Devices in Refineries — Part I: Sizing
and Selection
API RP 520, Sizing, Selection, and Installation of Pressure-Relieving Devices in Refineries — Part II:
Installation
API 526, Flanged Steel Pressure Relief Valves
ANSI/ASME B31.3, Process Piping
3 Terms, abbreviated terms and definitions
For the purposes of this document, the terms, abbreviated terms and definitions given in ISO 10438-1 apply.
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ISO 10438-4:2007(E)
4 General
4.1 System selection
Datasheets for system specifications are provided in Annex A.
Annex B provides schemas of typical system components and diagrams of typical, complete dry gas seal
support systems and modules. These schemas and diagrams illustrate the general philosophy and
requirements of this part of ISO 10438 and are included to assist the purchaser in the selection of an
appropriate system. The purchaser and the vendor shall mutually agree upon an acceptable system.
Annex C provides an inspector checklist of typical items reviewed by the purchaser.
4.2 Basic design
4.2.1 The equipment (including auxiliaries) covered by this part of ISO 10438 shall be designed and
constructed for a minimum service life of 20 years and at least 5 years of uninterrupted operation.
NOTE It is recognized that this is a design criterion.
z 4.2.2 If specified, the purchaser may specify the vendor responsible for each portion of the design, scope of
supply, installation and performance of the dry gas seal system. If the purchaser is not the end user, then the
end user shall approve the vendors specified.
z 4.2.3 The purchaser shall specify the equipment's normal operating point and all other operating points.
Other parameters required for the design of the seal support system, such as gas composition, maximum and
minimum flare pressure, maximum and minimum sealing pressure and settle-out pressure shall also be
specified.
4.2.4 Unless otherwise specified, the lube-oil console and the dry gas seal module shall be mounted on
separate skids.
4.2.5 The dry gas seal system shall be designed to serve the full range of equipment operating conditions
specified. These conditions may include but are not limited to the following:
a) settle-out pressures;
b) process relief-valve settings;
c) shop test and field run-ins;
d) start-up conditions;
e) gas composition.
NOTE This requires a detailed system review with the equipment suppliers, purchaser and owner, and is normally
finalized at the coordination meeting.
4.2.6 Control systems shall provide adequate gas velocity across the labyrinths at all clearances, including
minimum labyrinth clearance to twice the maximum design labyrinth clearance to prevent migration of
contaminents from the process gas.
NOTE In a flow-control system, velocity across the labyrinths decreases as clearances increase.
4.2.7 All gas streams (including alternate, backup, start-up sources) into the seal shall be provided at a
temperature of at least 20 K (35 °R) above their dew point in order to preclude the possibility of liquid entering
the dry gas seal.
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ISO 10438-4:2007(E)
NOTE 1 On some systems, the discharge temperature of the compressor gas stream might not provide this dew-point
margin.
NOTE 2 In some cases, this can require heaters and/or heat tracing by the owner.
The dew-point margin shall be maintained throughout the seal and not just at the supply connections.
In some cases, alternate gases to the process gas should be considered for start-up or dew-point reasons.
z 4.2.8 If specified, additional provision for seal-gas conditioning as specified by the purchaser shall be
furnished.
NOTE Gas conditioning can involve heat tracing, alternate seal-gas sources, coalescing filters, or other provisions.
4.2.9 Valved vents, drains and piping shall be furnished to permit draining, cleaning and refilling of idle
components, such as filter elements, while the equipment is in operation.
4.2.10 Seal-gas module piping shall be arranged such that it can be manually drained prior to start-up to
avoid the possibility of condensed liquids entering the seals.
This is also a requirement for interconnecting piping that shall be followed by the packager or installation
contractor.
z 4.2.11 The purchaser shall specify when and where double block and bleed valves are required for isolating
a component and how they are arranged.
NOTE Double block valves are normally provided where there are safety or environmental issues associated with the
reliability of a single block valve.
z 4.2.12 Filters, drain traps and other pressure vessels shall be in accordance with the specified pressure
design code. The purchaser shall specify if it is necessary that the vessels be code stamped.
NOTE 1 Most vessels for the gas seal module are smaller than the size required for the ASME code stamp.
NOTE 2 Code stamping might not be applicable for pressure design codes other than ASME.
NOTE 3 Reference can be made to ISO 10438-1:2007, 4.5.7. Local jurisdictions can require a code stamp.
4.2.13 The module and components shall perform on test and on its permanent foundation within the
specified acceptance criteria. After installation, the performance of the module shall be the joint responsibility
of the purchaser and the vendor who has unit responsibility.
z 4.2.14 The vendor shall advise the purchaser of, and both parties shall mutually agree upon, any special
provisions that are necessary to ensure that an adequate backup supply of seal gas and seal buffer gas or
seal separation gas is maintained in the event of complete loss of the main seal-gas supply source. These
provisions may include alternate seal-gas supply sources, backup gas bottles and special arrangements for
start-up, purge gas and settle-out conditions. Provisions shall be adequate for block-in vent or purge situations
as applicable. The purchaser shall specify the required block-in time. The purchaser and the vendor shall
mutually agree upon the backup system and its component requirements.
4.2.15 Block valves that interrupt the gas flow to the equipment shall not be installed in gas supply lines
downstream of the filters unless the block valves are part of a component block and bypass arrangement.
4.2.16 The support structure shall be stainless steel or carbon steel and painted.
4.2.17 Dry-gas-seal system piping size and vents shall be sized to prevent over-pressurization of the bearing
housings in the event of a failure of the seal.
This is a system requirement, which should be coordinated between the equipment supplier (seal housing
connection sizes), dry-gas-seal system module designer (vent-piping sizes) and the installation designer (vent
sizes and piping lengths).
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ISO 10438-4:2007(E)
4.3 Gas filters
4.3.1 General
4.3.1.1 The filters shall have a minimum efficiency of 98,8 % on particles less than or equal to 4 µm
(beta ratio, β W 85) and shall be in accordance with the dry gas seal manufacturer's requirements.
4
4.3.1.2 Gas filters shall be sized for a collapse differential pressure of at least 500 KPa (5 bar; 70 psi).
4.3.1.3 The filter element material shall be designed for the maximum gas temperature and shall be
compatible with the gas filtered.
4.3.1.4 Unless otherwise specified, filters in flammable or toxic services shall have bolted covers.
4.3.1.5 Unless otherwise specified, the filter housings shall be stainless steel.
4.3.2 Particulate filter sizing
4.3.2.1 For differential-pressure control systems, filters shall be sized for a clean pressure drop of 21 kPa
(0,21 bar; 3 psid) at twice the gas flow calculated at maximum labyrinth design clearance and at the design
differential pressure.
4.3.2.2 For flow-control systems, filters shall be sized for a clean pressure drop of 10 kPa (0,10 bar; 40 in
of water) at three times normal flow.
4.3.3 Coalescing filter sizing
When the gas contains liquids or moisture, coalescing filters shall be provided. If the knockout rates exceed
50 % of the coalescing capacity of the element, a mechanical separator shall be installed ahead of the filter
assembly.
4.4 Transfer valves
4.4.1 For flammable or toxic service, there shall be no leakage into the isolated system (such as the
standby filter). When an isolation system is designed such that total shutoff of flow adversely affects the seal,
the vendor shall provide cautionary warning signs to that effect on the dry-gas-seal system module.
NOTE Four individual block valves or a combination of block valves and transfer valves can be required for positive
isolation to transfer filters.
4.4.2 Transfer valves shall have steel bodies. Valve stems, plugs or balls shall be made of stainless steel.
4.5 Condensate traps
4.5.1 One condensate drain trap per coalescing filter shall be provided if condensate can be present at the
coldest operating temperature in the seal gas and or the seal buffer gas. Gas downstream of the filter and trap
shall be kept liquid-free.
NOTE For some services, heat tracing and/or drain traps at supply piping low points downstream of the control valve
can be required.
4.5.2 Non-repairable float traps are acceptable for services below 3,1 MPa (31 bar; 450 psig) if approved by
the purchaser.
4.5.3 A mechanical, float-type trap is permitted for gas pressures less than or equal to 6,8 MPa (68 bar;
1 000 psig).
Level-transmitter, control-type traps shall be used when gas fouling can interfere with the operation of
mechanical, float-type traps.
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ISO 10438-4:2007(E)
4.5.4 For pressures greater than 6,8 MPa (68 bar; 1 000 psig), snap-acting level transmitter/controllers and
separate control valves shall be used.
4.5.5 All low points upstream of filters shall have drain valves.
4.5.6 Traps configured as specified in 4.5.2 and 4.5.3 shall be furnished with reflex-type gauge glasses,
magnetic level indicators or other types of level indication as specified. The inlet piping shall enter the seal
traps above the condensate level of the traps.
4.5.7 Unless otherwise specified, drain lines for traps on the system module shall be manifolded and a
flange connection supplied at the edge of the module.
5 Piping and tubing
5.1 The vendor shall furnish the dry-gas-seal module, including mounted appurtenances, located within the
confines of the base area. All connections on the module for interconnecting piping to the equipment shall be
flanged. Module interface flanges connected to tubing shall be supported from the module structure.
NOTE All mounted appurtenances are kept within the confines of the base area to keep work areas and walkways as
free as possible from obstructions and to protect tubing from damage. Externally supported, flanged exit connections on
tubing are used to protect the tubing from external loads.
The interconnecting system between the module and equipment should be rigid pipe. The interconnecting
system is provided by the vendor as defined in the datasheets. Piping and tubing shall be austenitic stainless
steel and shall be in accordance with ISO 10438-1:2007, Tables 1, 5 and 6 unless otherwise specified.
5.2 Unless otherwise specified, dry-gas-seal modules designed for working pressures (gauge) below
6 200 KPa (62 bar; 900 psi) shall have the gas flow lines manufactured from stainless steel tubing or stainless
steel piping.
5.3 Unless otherwise specified, dry-gas-seal modules with working pressures (gauge) greater than
6 200 KPa (62 bar; 900 psi) shall have gas flow lines manufactured from stainless steel piping.
5.4 Instrument valves within the dry-gas-seal module on tubing lines shall be tubing valves.
5.5 Control valves shall have steel bodies and stainless steel trim. Where practical, valves shall be
removable without removing piping or tubing.
NOTE Smaller valves can have threaded connections that require fittings to be disconnected.
5.6 Threaded connections in toxic and flammable service shall be used only as approved by the purchaser.
NOTE Small component size can dictate the use of threaded components. Seal welding is an acceptable alternative
but results in maintenance implications.
6 Instrumentation, control and electrical systems
6.1 General
Instrumentation shall be in accordance with ISO 10438-1:2007, Clause 6, except as modified in 6.2 to 6.3.
6.2 Alarms and shutdowns
6.2.1 Unless otherwise specified, the vendor shall furnish and mount, as a minimum, the primary alarm and
shutdown contacts specified in Table 1.
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ISO 10438-4:2007(E)
Table 1 — Conditions requiring alarms and shutdowns
Condition Alarm Shutdown
a
Seal-gas supply for all seal types except double x —
Seal-gas supply for double seal x x
Seal-gas supply, high flow, for double seal x —
b f
High vent-gas pressure or flow x x
High primary vent-gas pressure or flow on tandem seal or tandem seal wit
...