ISO 20766-20:2019
(Main)Road vehicles - Liquefied petroleum gas (LPG) fuel systems components - Part 20: Filter unit
Road vehicles - Liquefied petroleum gas (LPG) fuel systems components - Part 20: Filter unit
This document specifies general information regarding the filter unit component of liquefied petroleum gas fuel, intended for use on the types of motor vehicles as defined in ISO 3833. It provides general design principles and specifies requirements for instructions and marking. It also specifies test requirements for filter units. This document is applicable to vehicles (mono-fuel, bi-fuel or dual-fuel applications) using gaseous fuels in accordance with ISO 9162. It is not applicable to the following: a) fuel containers; b) stationary gas engines; c) container mounting hardware; d) electronic fuel management; e) refuelling receptacles. NOTE 1 It is recognized that miscellaneous components not specifically addressed herein can be examined for compliance with the criteria of any applicable part of ISO 20766, including testing to the appropriate functional tests. NOTE 2 All references to pressure in this document are considered gauge pressures unless otherwise specified. NOTE 3 This document applies to devices which have a service pressure in the range of 110 kPa (Butane rich at 20 °C) and 840 kPa (Propane at 20 °C), hereinafter referred to in this document. Other service pressures can be accommodated by adjusting the pressure by the appropriate factor (ratio).
Véhicules routiers — Équipements pour véhicules utilisant le gaz de pétrole liquéfié (GPL) comme combustible — Partie 20: Unité de filtrage
General Information
- Status
- Published
- Publication Date
- 30-Oct-2019
- Technical Committee
- ISO/TC 22/SC 41 - Specific aspects for gaseous fuels
- Current Stage
- 9093 - International Standard confirmed
- Start Date
- 06-Mar-2025
- Completion Date
- 13-Dec-2025
Relations
- Effective Date
- 06-Jun-2022
Overview
ISO 20766-20:2019 is an international standard specifying the requirements for filter units used in liquefied petroleum gas (LPG) fuel systems for road vehicles. This standard is part 20 of the ISO 20766 series, which focuses on components for LPG fuel systems. It applies to LPG-powered motor vehicles defined under ISO 3833, including mono-fuel, bi-fuel, or dual-fuel applications compliant with ISO 9162.
The document outlines the general design principles, marking guidelines, and testing requirements to ensure filter units meet safety, reliability, and performance standards. It specifically covers filter units functioning within a service pressure range of 110 kPa (butane rich) to 840 kPa (propane) at 20 °C.
Key Topics
Scope and Applicability
The standard excludes fuel containers, stationary gas engines, container mounting hardware, electronic fuel management, and refuelling receptacles. It targets devices handling specific LPG pressures and offers guidance for additional miscellaneous components under the broader ISO 20766 framework.Marking and Identification
Clear and traceable markings on filter units are mandatory, including:- Manufacturer or agent identification (name, trademark, or symbol)
- Model designation and part number
- Working pressure and temperature range
- Filter micron rating
Recommended markings include flow direction, type of fuel, electrical ratings (if applicable), certification symbols, approval numbers, serial/date codes, and reference to this ISO standard.
Construction Requirements
Filter units must comply with the overall general requirements in ISO 20766-1 and performance standards in ISO 20766-2. Electrical connections should meet IP54 ingress protection as per IEC 60529.Testing Protocols
The standard specifies several critical tests to verify filter unit integrity and performance:- Hydrostatic strength test at 2.25 times the working pressure to ensure structural robustness.
- Low temperature test to evaluate leakage at temperatures as low as -40 °C, ensuring a maximum leak rate of 15 cm³/h under 150% working pressure after temperature conditioning.
- High temperature test to assess leakage at elevated temperatures (65 °C to 120 °C depending on the filter), with the same leakage limits and conditioning requirements.
Additional optional tests may include corrosion resistance, material compatibility, and thermal cycling aligned with ISO 20766-2.
Applications
ISO 20766-20:2019 is essential for manufacturers, engineers, and regulatory bodies involved in the design, production, testing, and certification of LPG fuel system components in road vehicles. Its practical applications include:
- Ensuring safety and reliability of LPG filter units by standardizing performance and durability requirements.
- Facilitating cross-border compliance and market entry by harmonizing component standards internationally.
- Supporting the development of environmentally-friendly LPG vehicle technologies by guaranteeing fuel purity and system efficiency.
- Guiding quality assurance and inspection processes for automotive suppliers and aftermarket parts manufacturers.
- Enabling customers and fleet operators to trace and verify component performance and certification status through mandated markings.
Related Standards
To fully comply with LPG fuel system requirements, ISO 20766-20:2019 should be used in conjunction with the following standards:
- ISO 20766-1: Road vehicles - Liquefied petroleum gas (LPG) fuel systems components - Part 1: General requirements and definitions
- ISO 20766-2: Road vehicles - LPG fuel systems components - Part 2: Performance and general test methods
- ISO 3833: Road vehicles - Types - Terms and definitions, to classify vehicles covered by this standard
- ISO 9162: Petroleum products - Fuels (Class F) - Liquefied petroleum gases - Specifications, aligning fuel quality standards
- IEC 60529: Degrees of protection provided by enclosures (IP Code), specifying electrical connection requirements
By adhering to ISO 20766-20:2019, stakeholders ensure that LPG filter units meet internationally recognized benchmarks for safety, durability, and performance, promoting reliable and efficient LPG fueling systems for road vehicles worldwide.
Frequently Asked Questions
ISO 20766-20:2019 is a standard published by the International Organization for Standardization (ISO). Its full title is "Road vehicles - Liquefied petroleum gas (LPG) fuel systems components - Part 20: Filter unit". This standard covers: This document specifies general information regarding the filter unit component of liquefied petroleum gas fuel, intended for use on the types of motor vehicles as defined in ISO 3833. It provides general design principles and specifies requirements for instructions and marking. It also specifies test requirements for filter units. This document is applicable to vehicles (mono-fuel, bi-fuel or dual-fuel applications) using gaseous fuels in accordance with ISO 9162. It is not applicable to the following: a) fuel containers; b) stationary gas engines; c) container mounting hardware; d) electronic fuel management; e) refuelling receptacles. NOTE 1 It is recognized that miscellaneous components not specifically addressed herein can be examined for compliance with the criteria of any applicable part of ISO 20766, including testing to the appropriate functional tests. NOTE 2 All references to pressure in this document are considered gauge pressures unless otherwise specified. NOTE 3 This document applies to devices which have a service pressure in the range of 110 kPa (Butane rich at 20 °C) and 840 kPa (Propane at 20 °C), hereinafter referred to in this document. Other service pressures can be accommodated by adjusting the pressure by the appropriate factor (ratio).
This document specifies general information regarding the filter unit component of liquefied petroleum gas fuel, intended for use on the types of motor vehicles as defined in ISO 3833. It provides general design principles and specifies requirements for instructions and marking. It also specifies test requirements for filter units. This document is applicable to vehicles (mono-fuel, bi-fuel or dual-fuel applications) using gaseous fuels in accordance with ISO 9162. It is not applicable to the following: a) fuel containers; b) stationary gas engines; c) container mounting hardware; d) electronic fuel management; e) refuelling receptacles. NOTE 1 It is recognized that miscellaneous components not specifically addressed herein can be examined for compliance with the criteria of any applicable part of ISO 20766, including testing to the appropriate functional tests. NOTE 2 All references to pressure in this document are considered gauge pressures unless otherwise specified. NOTE 3 This document applies to devices which have a service pressure in the range of 110 kPa (Butane rich at 20 °C) and 840 kPa (Propane at 20 °C), hereinafter referred to in this document. Other service pressures can be accommodated by adjusting the pressure by the appropriate factor (ratio).
ISO 20766-20:2019 is classified under the following ICS (International Classification for Standards) categories: 43.060.40 - Fuel systems. The ICS classification helps identify the subject area and facilitates finding related standards.
ISO 20766-20:2019 has the following relationships with other standards: It is inter standard links to ISO 7435:2024. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ISO 20766-20:2019 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 20766-20
First edition
2019-10
Road vehicles — Liquefied petroleum
gas (LPG) fuel systems components —
Part 20:
Filter unit
Véhicules routiers — Équipements pour véhicules utilisant le gaz de
pétrole liquéfié (GPL) comme combustible —
Partie 20: Unité de filtrage
Reference number
©
ISO 2019
© ISO 2019
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: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Markings . 2
5 Construction and assembly . 2
6 Tests . 2
6.1 Applicability . 2
6.2 Hydrostatic strength . 3
6.3 Low temperature. 3
6.4 High temperature. 3
Bibliography . 4
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 22, Road Vehicles, Subcommittee SC 41,
Specific aspects for gaseous fuels.
A list of all parts in the ISO 20766 series can be found on the ISO website.
Any feedback or questions on this docu
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.
Loading comments...