EN ISO 6368:2021

Petroleum, petrochemical and natural gas industries - Dry gas sealing systems for axial, centrifugal, and rotary screw compressors and expanders (ISO 6368:2021)

This document is applicable to dry gas sealing systems for axial, centrifugal, and rotary screw compressors and expanders as described in ISO 10439 (all parts), ISO 10440-1 and ISO 10440-2. Although intended for use primarily in oil refineries, it is also applicable to petrochemical facilities, gas plants, liquefied natural gas (LNG) facilities and oil and gas production facilities. The information provided is designed to aid in the selection of the system that is most appropriate for the risks and circumstances involved in various installations.
This document does not apply to other types of shaft seals such as clearance seals, restrictive ring seals or oil seals.
This document is a supplement to API Std 692, 1st edition (2018), the requirements of which are applicable with the exceptions specified in this document.

Erdöl-, petrochemische und Erdgasindustrie - Trockene Gasdichtungssysteme für Axial-, Radial- und Schraubenverdichter und Expander (ISO 6368:2021)

Industries du pétrole, de la pétrochimie et du gaz naturel - Systèmes d'étanchéité au gaz pour les compresseurs axiaux, centrifuges, à vis et les turbodétendeurs (ISO 6368:2021)

Petrokemična industrija ter industrija za predelavo nafte in zemeljskega plina - Tesnilni sistemi s suhim plinom za aksialne, centrifugalne in rotacijske vijačne kompresorje in ekspanderje (ISO 6368:2021)

Ta dokument se uporablja za tesnilne sisteme s suhim plinom za aksialne, centrifugalne ter rotacijske vijačne kompresorje in ekspanderje, kot je opisano v standardih ISO 10439 (vsi deli), ISO 10440-1 in ISO 10440-2. Čeprav je prvotno namenjen uporabi v naftnih rafinerijah, se lahko uporablja tudi v petrokemičnih obratih, plinarnah, obratih z utekočinjenim zemeljskim plinom (LNG) in obratih za proizvajanje plina. Podane informacije so namenjene za pomoč pri izbiri sistema, ki je najprimernejši za tveganja in okoliščine v različnih namestitvah. Ta dokument se ne uporablja za druge vrste tesnil za gredi, kot so labirintna, omejevalna ali oljna tesnila. Ta dokument dopolnjuje standard API 692, prvo izdajo (2018), katerega zahteve se uporabljajo za izjeme, določene v tem dokumentu.

General Information

• Status: Published
• Publication Date: 30-Nov-2021
• Withdrawal Date: 29-Jun-2022
• ICS: 75.180.20 - Processing equipment
• Technical Committee: CEN/TC 12 - Materials, equipment and offshore structures for petroleum and natural gas industries
• Drafting Committee: CEN/TC 12 - Materials, equipment and offshore structures for petroleum and natural gas industries
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 01-Dec-2021
• Completion Date: 01-Dec-2021
• Ref Project: SIST EN ISO 6368:2022 - Petroleum, petrochemical and natural gas industries - Dry gas sealing systems for axial, centrifugal, and rotary screw compressors and expanders (ISO 6368:2021)

Relations

• Replaces: EN ISO 10438-4:2007 - 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)
• Effective Date: 08-Dec-2021

Overview

EN ISO 6368:2021 - Petroleum, petrochemical and natural gas industries - Dry gas sealing systems for axial, centrifugal, and rotary screw compressors and expanders - provides guidance for the selection, specification and application of dry gas sealing systems used on compressors and expanders. Intended primarily for oil refineries, it is also applicable to petrochemical plants, gas plants, LNG facilities and upstream production sites. This European adoption of ISO 6368:2021 supplements API Std 692 (1st ed., 2018) by specifying exceptions and additional requirements tailored to ISO/CEN practice.

Key topics and requirements

• Scope and applicability
  • Covers dry gas sealing systems for axial, centrifugal and rotary screw compressors and expanders described in ISO 10439 and ISO 10440 (parts).
  • Excludes other shaft seals (clearance seals, restrictive ring seals, oil seals).
• Standards alignment
  • Acts as a supplement to API Std 692; where API clauses are referenced, EN ISO 6368 specifies ISO equivalents (for example ISO 10439, ISO 10440‑1/2) and other normative references.
• Materials and metallurgy
  • Requirements for sleeves, retainers, housings and carriers reference ISO materials standards (e.g., ISO 17945 as a substitute where applicable).
• Module DD3 - double seal differential control
  • Provides supplementary requirements for double-seal arrangements and differential pressure control between sealing chambers.
• Auxiliaries and system components
  • Guidance on coolers, pressure-relieving devices, valves, heat exchangers and system diagrams used in dry gas seal systems. ISO standards such as ISO 13706, ISO 16812 and ISO 23251 are cited as normative references.
• Safety and installation
  • Emphasizes selection based on risks and site circumstances, and includes references to pressure-relief and safety device standards.

Applications and users

EN ISO 6368:2021 is useful for:

• Mechanical and rotating-equipment engineers specifying or designing compressor seal systems
• Procurement and vendor evaluation teams assessing dry gas seal packages
• Maintenance and reliability engineers managing seal life, monitoring and replacement programs
• Process safety and inspection specialists ensuring compliance with pressure-relieving and material requirements
• OEMs of axial, centrifugal and rotary screw compressors and seal-system manufacturers

Practical applications include retrofits, new compressor train specification, seal system selection for LNG skids, refinery and petrochemical rotating equipment, and standardizing purchase requirements across multi-site operations.

Related standards

• API Std 692 (1st ed., 2018) - Dry Gas Sealing Systems (supplemented by EN ISO 6368)
• ISO 10439 (all parts), ISO 10440‑1/2 - compressor and expander equipment
• ISO 13706, ISO 16812, ISO 23251, ISO 17945 - referenced for coolers, heat exchangers, pressure-relief devices and materials

Using EN ISO 6368:2021 helps ensure consistent, safer and more reliable dry gas seal system selection and integration across petroleum, petrochemical and natural gas facilities.

Standards Content (Sample)

SLOVENSKI STANDARD
01-februar-2022
Nadomešča:
SIST EN ISO 10438-4:2008
Petrokemična industrija ter industrija za predelavo nafte in zemeljskega plina -
Tesnilni sistemi s suhim plinom za aksialne, centrifugalne in rotacijske vijačne
kompresorje in ekspanderje (ISO 6368:2021)
Petroleum, petrochemical and natural gas industries - Dry gas sealing systems for axial,
centrifugal, and rotary screw compressors and expanders (ISO 6368:2021)
Erdöl-, petrochemische und Erdgasindustrie - Trockene Gasdichtungssysteme für Axial-,
Radial- und Schraubenverdichter und Expander (ISO 6368:2021)
Industries du pétrole, de la pétrochimie et du gaz naturel - Systèmes d'étanchéité au gaz
pour les compresseurs axiaux, centrifuges, à vis et les turbodétendeurs (ISO 6368:2021)
Ta slovenski standard je istoveten z: EN ISO 6368:2021
ICS:
75.180.20 Predelovalna oprema Processing equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 6368
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2021
EUROPÄISCHE NORM
ICS 75.180.20 Supersedes EN ISO 10438-4:2007
English Version
Petroleum, petrochemical and natural gas industries - Dry
gas sealing systems for axial, centrifugal, and rotary screw
compressors and expanders (ISO 6368:2021)
Industries du pétrole, de la pétrochimie et du gaz Erdöl-, petrochemische und Erdgasindustrie -
naturel - Systèmes d'étanchéité au gaz pour les Trockene Gasdichtungssysteme für Axial-, Radial- und
compresseurs axiaux, centrifuges, à vis et les Schraubenverdichter und Expander (ISO 6368:2021)
turbodétendeurs (ISO 6368:2021)
This European Standard was approved by CEN on 5 November 2021.

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-CENELEC 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-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 6368:2021 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 6368:2021) has been prepared by Technical Committee ISO/TC 67 "Materials,
equipment and offshore structures for petroleum, petrochemical 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 NEN.
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 2022, and conflicting national standards shall be
withdrawn at the latest by June 2022.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 10438-4:2007.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
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,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 6368:2021 has been approved by CEN as EN ISO 6368:2021 without any modification.

INTERNATIONAL ISO
STANDARD 6368
First edition
2021-11
Petroleum, petrochemical and
natural gas industries — Dry gas
sealing systems for axial, centrifugal,
and rotary screw compressors and
expanders
Industries du pétrole, de la pétrochimie et du gaz naturel — Systèmes
d'étanchéité au gaz pour les compresseurs axiaux, centrifuges, à vis et
les turbodétendeurs
Reference number
ISO 6368:2021(E)
ISO 6368:2021(E)
© ISO 2021
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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO 6368:2021(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
st
4 Supplements to API 692, 1 edition (2018) . 2
4.1 General requirements . 2
4.2 Sleeves, retainers, housings, disk, and carrier — Metals . 2
4.3 Module DD3 — Double seal gas differential pressure control . 2
4.4 Cooler . 2
4.5 Pressure-relieving devices . 3
4.6 Materials . 3
4.7 Valves . 3
4.8 System diagrams . 4
4.9 Applicable standards . 4
Bibliography . 5
iii
ISO 6368:2021(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 developm
...