EN 88-2:2022

Safety and control devices for gas burners and gas burning appliances - Part 2: Pressure regulators for inlet pressures above 50 kPa up to and including 500 kPa

EN 13611:2019, Clause 1 applies with the following modification and addition:
Modification:
The 1st paragraph of EN 13611:2019, Clause 1 is replaced by:
This document specifies the safety, design, construction, and performance requirements and testing for pneumatic pressure regulators and safety devices for burners and appliances burning one or more gaseous fuels, hereafter referred to as “pressure regulators”.
This document is applicable to pressure regulators with declared maximum inlet pressures above 50 kPa up to and including 500 kPa and of nominal connection sizes up to and including DN 250.
Addition:
This document is applicable to:
-   pressure regulators incorporating safety devices;
-   pressure regulators and safety devices which use auxiliary energy;
-   stand-alone pressure regulators or pressure regulators equipped with a control device for maximum or minimum gas pressure.
This document is not applicable to:
-   pressure regulators connected directly to a gas distribution network or to a container that maintains a standard distribution pressure;
-   pressure regulators intended for gas appliances to be installed in the open air and exposed to the environment.
The 4th paragraph of EN 13611:2019, Clause 1 is removed.

Sicherheits- und Regeleinrichtungen für Gasbrenner und Gasgeräte - Teil 2: Druckregler für Eingangsdrücke über 50 kPa bis einschließlich 500 kPa

EN 13611:2019, Abschnitt 1, gilt mit folgender Änderung und Ergänzung:
Änderung:
Der erste Absatz von EN 13611:2019, Abschnitt 1, wird ersetzt durch:
Dieses Dokument legt die Sicherheits-, Auslegungs-, Konstruktions- und Leistungsanforderungen sowie die Prüfung von pneumatischen Druckreglern und Sicherheitseinrichtungen für Brenner und Brennstoffgeräte für einen oder mehrere gasförmige Brennstoffe, nachstehend als „Druckregler“ bezeichnet, fest.
Dieses Dokument gilt für Druckregler mit angegebenen höchsten Eingangsdrücken über 50 kPa bis einschließlich 500 kPa und mit Anschlussnennweiten bis einschließlich DN 250.
Ergänzung:
Dieses Dokument gilt für:
—   Druckregler, die Sicherheitseinrichtungen enthalten;
—   Druckregler und Sicherheitseinrichtungen, die Hilfsenergie benötigen;
—   unabhängige Druckregler oder Druckregler, die mit einer Regeleinrichtung für den höchsten oder niedrigsten Gasdruck ausgestattet sind.
Dieses Dokument gilt nicht für:
—   Druckregler, die unmittelbar an ein Gasverteilungsnetz oder an einen Behälter mit genormtem Verteilungsdruck angeschlossen sind;
—   Druckregler für Gasgeräte in Freiluftausführung, die Umwelteinflüssen ausgesetzt sind.
Der vierte Absatz von EN 13611:2019, Abschnitt 1, entfällt.

Dispositifs de sécurité et de contrôle pour les brûleurs à gaz et appareils utilisant des combustibles gazeux - Partie 2 : Régulateurs de pression pour pressions amont comprises entre 50 kPa et 500 kPa

L’article 1 de la norme EN13611 :2019 s’applique avec la modification et l’addition suivantes :
Modification :
Le 1er paragraphe de l’article 1 de la norme EN13611 :2019 est remplacé par ce qui suit :
Le présent document prescrit les exigences et essais de sécurité, de conception, de construction et de fonctionnement relatives aux régulateurs de pression pneumatiques et dispositifs de sécurité pour brûleurs et appareils utilisant un ou plusieurs combustibles gazeux, dénommés ci-après « régulateurs de pression ».
Le présent document est applicable aux régulateurs de pression dont la pression amont maximale est comprise entre 50 kPa et 500 kPa, de diamètre nominal de raccordement inférieur ou égal à DN 250.
Addition :
Le présent document est applicable :
-   aux régulateurs de pression à dispositifs de sécurité intégrés ;
-   aux régulateurs de pression et aux dispositifs de sécurité qui utilisent une énergie électrique auxiliaire ; et
-   aux régulateurs de pression autonomes ou aux régulateurs de pression équipés d'un dispositif de régulation pour pression de gaz maximale ou minimale.
Le présent document ne s'applique pas :
-   aux régulateurs de pression qui sont raccordés directement au réseau de distribution ou à un récipient qui maintient en aval une valeur de pression de distribution normalisée ;
-   aux régulateurs de pression destinés à des appareils à gaz qui doivent être installés en plein air et exposés aux intempéries.
Le 4ième paragraphe de l’article 1 de la EN 13611 :2019 est supprimé.

Varnostne in nadzorne naprave za plinske gorilnike in plinske aparate - 2. del: Regulatorji tlaka za vstopne tlake nad 50 kPa do vključno 500 kPa

General Information

• Status: Withdrawn
• Publication Date: 11-Oct-2022
• Withdrawal Date: 13-Apr-2025
• ICS: 23.060.40 - Pressure regulators
• Technical Committee: CEN/TC 58 - Safety and control devices for burners and appliances burning gaseous or liquid fuels
• Drafting Committee: CEN/TC 58/WG 13 - Mechanics
• Current Stage: 9960 - Withdrawal effective - Withdrawal
• Start Date: 06-Nov-2024
• Completion Date: 14-Apr-2025
• Directive: 2014/68/EU - Directive 2014/68/EU of the European Parliament and of the Council of 15 May 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of pressure equipment
• Directive: 2016/426 - REGULATION (EU) 2016/426 OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 9 March 2016 on appliances burning gaseous fuels and repealing Directive 2009/142/EC
• Mandate: M/071 - Mandate to CEN for standardization in the field of Pressure equipment
• Mandate: M/BC/CEN/89/6 - Standardization request to CEN concerning appliances burning gaseous fuels
• Ref Project: SIST EN 88-2:2022 - Safety and control devices for gas burners and gas burning appliances - Part 2: Pressure regulators for inlet pressures above 50 kPa up to and including 500 kPa

Relations

• Replaces: EN 88-2:2007 - Pressure regulators and associated safety devices for gas appliances - Part 2: Pressure regulators for inlet pressures above 500 mbar up to and including 5 bar
• Effective Date: 19-Oct-2022
• Merged Into: EN 88-2:2022+A1:2024 - Safety and control devices for gas burners and gas burning appliances - Part 2: Pressure regulators for inlet pressures above 50 kPa up to and including 500 kPa
• Effective Date: 05-Oct-2024

Standards Content (Sample)

SLOVENSKI STANDARD
01-december-2022
Nadomešča:
SIST EN 88-2:2008
Varnostne in nadzorne naprave za plinske gorilnike in plinske aparate - 2. del:
Regulatorji tlaka za vstopne tlake nad 50 kPa do vključno 500 kPa
Safety and control devices for gas burners and gas burning appliances - Part 2: Pressure
regulators for inlet pressures above 50 kPa up to and including 500 kPa
Sicherheits- und Regeleinrichtungen für Gasbrenner und Gasgeräte - Teil 2: Druckregler
für Eingangsdrücke über 50 kPa bis einschließlich 500 kPa
Dispositifs de sécurité et de contrôle pour les brûleurs à gaz et appareils utilisant des
combustibles gazeux - Partie 2 : Régulateurs de pression pour pressions amont
comprises entre 50 kPa et 500 kPa
Ta slovenski standard je istoveten z: EN 88-2:2022
ICS:
23.060.40 Tlačni regulatorji Pressure regulators
27.060.20 Plinski gorilniki Gas fuel burners
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 88-2
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2022
EUROPÄISCHE NORM
ICS 23.060.40 Supersedes EN 88-2:2007
English Version
Safety and control devices for gas burners and gas burning
appliances - Part 2: Pressure regulators for inlet pressures
above 50 kPa up to and including 500 kPa
Dispositifs de sécurité et de contrôle pour les brûleurs Sicherheits- und Regeleinrichtungen für Gasbrenner
à gaz et appareils utilisant des combustibles gazeux - und Gasgeräte - Teil 2: Druckregler für Eingangsdrücke
Partie 2 : Régulateurs de pression pour pressions über 50 kPa bis einschließlich 500 kPa
amont comprises entre 50 kPa et 500 kPa
This European Standard was approved by CEN on 8 August 2022.

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, Türkiye 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
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 88-2:2022 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
Introduction . 6
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 9
4 Classification . 14
4.1 Classes of control . 14
4.2 Groups of control . 14
4.3 Classes of control functions . 14
4.4 Types of DC supplied controls . 14
5 Test conditions and uncertainty of measurements . 14
6 Design and construction . 15
6.1 General . 15
6.2 Mechanical parts of the control . 15
6.3 Materials . 17
6.4 Gas connections . 18
6.5 Electrical parts of the control . 18
6.6 Protection against internal faults for the purpose of functional safety . 18
7 Performance . 18
7.1 General . 18
7.2 Leak-tightness . 19
7.3 Torsion and bending . 19
7.4 Rated flow rate . 19
7.5 Durability . 20
7.6 Performance tests for electronic controls . 20
7.7 Long-term performance for electronic controls . 20
7.8 Data exchange . 20
7.101 Pressure regulator performance . 20
7.102 Safety devices . 26
8 Electrical requirements . 31
8.1 General . 31
8.2 Protection by enclosure . 31
8.101 Plug connections. 31
9 Electromagnetic compatibility (EMC) . 32
9.1 Protection against environmental influences . 32
9.2 Supply voltage variations below 85 % of rated voltage . 32
9.3 Voltage dips and interruptions . 32
9.4 Supply frequency variations . 32
9.5 Surge immunity tests . 32
9.6 Electrical fast transient/burst . 32
9.7 Immunity to conducted disturbances induced by radio frequency fields . 32
9.8 Immunity to radiated disturbances induced by radio frequency fields . 32
9.9 Electrostatic discharge tests . 32
9.10 Power frequency magnetic field immunity tests . 32
9.11 Harmonics and interharmonics including mains signalling at a. c. power port, low
frequency immunity tests . 32
10 Marking, instructions . 33
10.1 Marking . 33
10.2 Instructions . 33
10.3 Warning notice . 34
Annex A (informative) Abbreviations and Symbols . 35
Annex B (informative) Leak-tightness tests for gas controls – volumetric method . 36
Annex C (informative) Leak-tightness tests for gas controls – pressure loss method . 37
Annex D (normative) Conversion of pressure loss into leakage rate . 38
Annex E (normative) Electrical/electronic component fault modes . 39
Annex F (normative) Additional requirements for safety accessories and pressure
accessories as defined in EU Directive 2014/68/EU. 40
Annex G (normative) Materials for pressurized parts . 41
Annex H (normative) Additional materials for pressurized parts . 42
Annex I (normative) Requirements for controls used in DC supplied burners and
appliances burning gaseous or liquid fuels. 43
Annex J (normative) Method for the determination of a Safety Integrity Level (SIL) . 44
Annex K (normative) Method for the determination of a Performance Level (PL) . 45
Annex L (informative) Relationship between Safety Integrity Level (SIL) and Performance
Level (PL) . 46
Annex M (normative) Reset functions . 47
Annex N (informative) Guidance document on Environmental Aspects . 48
Annex O (normative) Seals of elastomer, cork and synthetic fibre mixtures . 49
Annex AA (informative) Typical pressure regulators and safety devices . 50
AA.1 Main components of a pressure regulator . 50
AA.2 Main components of a safety shut-off device . 53
Annex BB (informative) Overview of requirements and test conditions (as given in 7.101),
and examples of performance curves for pressure regulators . 55
Annex CC (normative) Creep relief device . 58
CC.1 General . 58
CC.2 Design and construction . 58
CC.3 Performance requirements . 58
CC.4 Marking, instructions . 58
Annex DD (informative) Comparison between EN 334:2019 and EN 88-2:2022 . 59
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of Regulation (EU) 2016/426 aimed to be covered . 60
Bibliography . 63

European foreword
This document (EN 88-2:2022) has been prepared by Technical Committee CEN/TC 58 “Safety and
control devices for burners and appliances burning gaseous or liquid fuels”, the secretariat of which is
held by BSI.
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 April 2023, and conflicting national standards shall be
withdrawn at the latest by October 2025.
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 88-2:2007.
The following significant changes compared to the previous edition have been incorporated in this
document:
a) scope extended to “Pressure regulators incorporating safety devices”;
b) title changed to be aligned with the title of CEN/TC 58;
c) requirements from EU Directive 2014/68/EU were not adopted;
d) alignment with EN 13611:2019;
e) terms and definitions are aligned with EN 13611:2019;
f) reference to EN 437 removed;
g) requirements and tests added for pressure regulators which use auxiliary energy;
h) classifications according to accuracy, lock-up pressure, and over-pressure shut-off added;
i) Clause 6 extended to “Design and construction”;
j) 6.2.104 “Integral safety shut-off device” added;
k) 6.2.105 “Resistance to pressure” added;
l) 6.2.107 “Creep relief device” added;
m) 6.5.1 “Electronic parts of the control – General” is applicable;
n) 7.2.2 “Test for leak-tightness”, new value for test pressure;
o) design of all figures adapted to design of figures in EN 13611:2019;
p) information on life time for safe function (designed lifetime) added to instructions;
q) Annex BB “Overview of requirement and test conditions” added;
r) Annex CC “Creep relief device” added;
s) Annex DD “Comparison between EN 334:2019 and EN 88-2:2022” added;
t) EN 88-1, EN 88-2 and EN 88-3 aligned.
This document has been prepared under a Standardization Request given to CEN by the European
Commission and the European Free Trade Association, and supports essential requirements of EU
Directive(s) / Regulation(s).
For relationship with EU Directive(s) / Regulation(s), see informative Annex ZA, which is an integral part
of this document.
The EN 88 series consists of the following parts:
— EN 88-1, Safety and control devices for gas burners and gas burning appliances — Part 1: Pressure
regulators for inlet pressures up to and including 50 kPa;
— EN 88-2, Safety and control devices for gas burners and gas burning appliances — Part 2: Pressure
regulators for inlet pressures above 50 kPa up to and including 500 kPa;
— EN 88-3, Safety and control devices for gas burners and gas burning appliances — Part 3: Pressure
and/or flow rate regulators for inlet pressures up to and including 500 kPa, electronic types.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations 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, Türkiye and the United
Kingdom.
Introduction
This document is intended to be used in conjunction with EN 13611:2019.
EN 13611:2019 recognizes the safety level specified by CEN/TC 58 and is regarded as a horizontal
standard dealing with the safety, construction, performance and testing of controls for burners and
appliances burning gaseous and/or liquid fuels.
The general requirements for controls are given in EN 13611:2019, and methods for classification and
assessment for new controls and control functions are given in EN 14459:2021 (see Figure 1).
EN 126:2012 (see Figure 1) specifies multifunctional controls combining two or more controls and
Application Control Functions, one of which is a mechanical control function. The requirements for
controls and Application Control Functions are given in the specific control standard (see Figure 1,
control functions).
Figure 1 — Interrelation of control standards
EN 13611:2019 should be used in conjunction with the specific standard for a specific type of control (e.g.
EN 88-1:2022, EN 88-2:2022, EN 88-3:2022, EN 125:2022, EN 126:2012, EN 161:2022, EN 257:2022,
EN 298:2022, EN 1106:2022, EN 1643:2022, EN 1854:— , EN 12067-2:2022, EN 16304:2022,
EN 16340:2014, EN 16678:2022 and EN 16898:2022), or for controls for specific applications.
EN 13611:2019 can also be applied, so far as reasonable, to controls not mentioned in a specific standard
and to controls designed on new principles, in which case additional requirements can be necessary.
EN 14459:2021 provides methods for classification and assessment of new control principles.
Primarily in industrial applications it is common practice to rate the safety of a plant based on values
describing the likelihood of a dangerous failure. These values are being used to determine Safety Integrity
Levels or Performance Levels when the system is being assessed in its entirety.
CEN/TC 58 standards for safety relevant controls do go beyond this approach, because for a certain life
time for which the product is specified, designed and tested a dangerous failure is not allowed at all.
Failure modes are described and assessed in greater detail.

Under preparation. Stage at the time of publication: FprEN 1854:2022.
Measures to prevent from dangerous situations are defined. Field experience over many decades is
reflected in the CEN/TC 58 standards. Requirements of EN 13611:2019 can be considered as proven in
practice.
This document refers to clauses of EN 13611:2019 or adapts clauses by stating “with the following
modification”, “with the following addition”, “is replaced by the following” or “is not applicable” in the
corresponding clause.
This document adds clauses or subclauses to the structure of EN 13611:2019 which are particular to this
document. Subclauses which are additional to those in EN 13611:2019 are numbered starting from 101.
Additional Annexes are designated as Annex AA, BB, CC, etc. It should be noted that these clauses,
subclauses and Annexes are not indicated as an addition.
If by reference to EN 13611:2019 the term “control” is given, this term should be read as “pressure
regulator”.
1 Scope
EN 13611:2019, Clause 1 applies with the following modification and addition:
Modification:
st
The 1 paragraph of EN 13611:2019, Clause 1 is replaced by:
This document specifies the safety, design, construction, and performance requirements and testing for
pneumatic pressure regulators and safety devices for burners and appliances burning one or more
gaseous fuels, hereafter referred to as “pressure regulators”.
This document is applicable to pressure regulators with declared maximum inlet pressures above 50 kPa
up to and including 500 kPa and of nominal connection sizes up to and including DN 250.
Addition:
This document is applicable to:
— pressure regulators incorporating safety devices;
— pressure regulators and safety devices which use auxiliary energy;
— stand-alone pressure regulators or pressure regulators equipped with a control device for maximum
or minimum gas pressure.
This document is not applicable to:
— pressure regulators connected directly to a gas distribution network or to a container that maintains
a standard distribution pressure;
— pressure regulators intended for gas appliances to be installed in the open air and exposed to the
environment.
th
The 4 paragraph of EN 13611:2019, Clause 1 is removed.
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.
EN 161:2022, Automatic shut-off valve for gas burners and gas appliances
EN 549:2019, Rubber materials for seals and diaphragms for gas appliances and gas equipment
EN 682:2002 , Elastomeric seals — Materials requirements for seals used in pipes and fittings carrying gas
and hydrocarbon fluids
EN 13611:2019 , Safety and control devices for burners and appliances burning gaseous and/or liquid fuels
— General requirements
As impacted by EN 682:2002/A1:2005.
As impacted by EN 13611:2019/AC:2021.
EN 60534-2-3:2016, Industrial-process control valves — Part 2-3: Flow capacity — Test procedures
(IEC 60534-2-3:2015)
EN 175301-803:2006, Detail Specification: Rectangular connectors — Flat contacts, 0,8 mm thickness,
locking screw not detachable
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 13611:2019 and the following
apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.101
pressure regulator
device which maintains the outlet pressure constant independent of the variations in inlet pressure
and/or flow rate within defined limits
[SOURCE: EN 88-1:2022, 3.101]
3.102
control member
movable part of the pressure regulator which varies flow rate and/or outlet pressure directly
[SOURCE: EN 88-1:2022, 3.107]
3.103
safety shut-off device
SSD
device having the function of staying in the open position under normal operating conditions and to shut
off the gas flow automatically and completely when the monitored pressure deviates above or below the
pre-set value
3.104
housing
part of the pressure regulator and/or SSD that is the main pressure containing envelope
3.105
controller
device which normally includes a setting element, normally a spring, to obtain a set value of the outlet
pressure, and a pressure detector element, normally a diaphragm for the outlet pressure
3.106
actuator
device or mechanism which changes the signal from the controller into a corresponding movement
controlling the position of the control member
3.107
working diaphragm
flexible member which, under the influence of the forces arising from loading and pressure, operates the
control member
Note 1 to entry: Diaphragms used as a control member are not covered by this definition.
[SOURCE: EN 88-1:2022, 3.122, modified – Note 1 to entry added]
3.108
pressure containing part
part where failure would result in release of gas to the atmosphere
Note 1 to entry: Such parts comprise housings, inner partition walls, control member, bonnets, the housing of the
actuator, blind flanges and pipes for process and sensing lines.
3.109
signal connection
connection that is used to convey pressure from part of an installation to the signal chamber
[SOURCE: EN 88-1:2022, 3.128]
3.110
breather line
line between the controller and/or pilot regulator and atmosphere which equalizes the pressure on a
detector element when it changes its position
3.111
fixture
functional device connected to the main components of the pressure regulator or SSD
3.112
exhaust line
line to atmosphere between the pressure regulator or fixtures for the safe venting of gas in the event of a
working diaphragm failure
3.113
trip mechanism
mechanism that releases the closure member when activated by the controller
3.114
SSD-actuator
device that is activated by the trip mechanism which shuts the closure member
3.115
relatching device
device that enables the complete opening of an SSD
3.116
motorization chamber
chamber at the higher pressure of two chambers under pressure within the housing of actuator
3.117
monitored pressure
pressure monitored and safeguarded by the SSD
3.118
trip pressure
pressure value at which the closing member starts to move
3.119
upper trip pressure
p
2o
upper limit of the monitored over-pressure
3.120
lower trip pressure
p
2u
lower limit of the monitored under-pressure
3.121
outlet setting pressure
p
2s
outlet pressure at which the pressure regulator is set for test purposes
[SOURCE: EN 88-1:2022, 3.115]
3.122
maximum outlet pressure
p
2max
upper limit of the outlet pressure, as stated in the instructions, at which the pressure regulator can be
operated
[SOURCE: EN 88-1:2022, 3.111]
3.123
minimum outlet pressure
p
2min
lower limit of the outlet pressure, as stated in the instructions, at which the pressure regulator can be
operated
[SOURCE: EN 88-1:2022, 3.112]
3.124
outlet pressure range
difference between maximum and minimum values of the outlet pressure, as stated in the instructions
[SOURCE: EN 88-1:2022, 3.111]
3.125
maximum inlet pressure
p
1max
highest inlet pressure, as stated in the instructions, at which the pressure regulator can be operated
Note 1 to entry: The definition of “maximum inlet pressure” is also known as “maximum allowable pressure PS”.
Note 2 to entry: In accordance with the strength requirements of this document.
3.126
minimum inlet pressure
p
1min
lowest inlet pressure, as stated in the instructions, at which the pressure regulator can be operated
[SOURCE: EN 88-1:2022, 3.110]
3.127
inlet pressure range
difference between the maximum and minimum values of the inlet pressure, as stated in the instructions
[SOURCE: EN 88-1:2022, 3.108]
3.128
maximum rated flow rate
q
max
upper limit of the rated air flow rate, corrected to standard conditions, as stated in the instructions
[SOURCE: EN 88-1:2022, 3.116]
3.129
minimum rated flow rate
q
min
lower limit of the rated air flow rate, corrected to standard conditions, as stated in the instructions
[SOURCE: EN 88-1:2022, 3.117]
3.130
steady state value
outlet pressure measured after step response remains constant
[SOURCE: EN 88-1:2022, 3.131, modified – Note 1 to entry removed]
3.131
settling tolerance
maximum difference between the current outlet pressure and its steady state value
[SOURCE: EN 88-1:2022, 3.132 , modified – Note 1 to entry removed]
3.132
performance curve
graphic representation of the outlet pressure as a function of the rated flow rate
Note 1 to entry: This curve is determined by increasing and then decreasing the rated flow rate with constant
inlet pressure and constant outlet setting pressure (see Figure BB.1).
3.133
family of performance curves
set of the performance curves for each value of inlet pressure determined for a given outlet setting
pressure
Note 1 to entry: See Figure BB.2.
3.134
accuracy
percentage of the outlet pressure relative to the outlet setting pressure within the operation range
3.135
accuracy class
AC
maximum permissible value of the accuracy
3.136
lock-up time
t
f
time taken for the control member to move from an open position to the closed position
3.137
lock-up pressure
p
2f
outlet pressure at which a pressure regulator closes when the outlet of the pressure regulator is sealed
[SOURCE: EN 88-1:2022, 3.124]
3.138
lock-up pressure class
SG
maximum permissible positive difference between the actual lock-up pressure(s) p and the
2f
corresponding outlet setting pressure(s) at a certain percentage of the maximum rated flow rate q ,
max
expressed as a percentage of the outlet setting pressure
Note 1 to entry: The lock-pressure pressure class SG is given by the following equation:
pp−
( )
2f 2s
SG 100⋅ (1)
p
2s
where
SG is the lock-up pressure class;
p is the lock-up pressure; and
2f
p is the outlet setting pressure.
2s
3.139
limit pressure
p
l
pressure at which yielding becomes apparent in any component of the pressure regulator or its fixtures
=
3.140
safety factor
S , S
b
ratio of the value of the limit pressure p to the value of the maximum allowable pressure PS
l
Note 1 to entry: This term applies to two separate discrete regions of the pressure regulator:
—  applied to the pressure regulator housing: S ;
b
—  applied to the other pressure containing parts of the pressure regulator: S.
3.141
creep relief device
CRD
small spring-loaded valve in the actuator of a direct acting pressure regulator which opens automatically
if the controlled pressure is higher than the lock-up pressure (including tolerance)
3.142
opening pressure
[creep relief device]
pressure at which the first internal leak occurs
3.143
closing pressure
[creep relief device]
pressure at which the creep relief device is leak tight after re-seating
4 Classification
4.1 Classes of control
EN 13611:2019, 4.1 is replaced by the following:
Pressure regulators shall be classified
— AC 1, AC 2,5, AC 5, AC 10, and AC 20 according to the pressure regulator accuracy class (7.101.2.4);
and / or
— SG 5, SG 10, SG 20, and SG 30 according to the lock-up pressure class (7.101.2.5); and / or
— AG 5, AG 10, AG 20, and AG 30 according to the over-pressure shut-off accuracy group (7.102.1).
4.2 Groups of control
Shall be according to EN 13611:2019, 4.2.
4.3 Classes of control functions
EN 13611:2019, 4.3 is not applicable.
4.4 Types of DC supplied controls
Shall be according to EN 13611:2019, 4.4.
5 Test conditions and uncertainty of measurements
Shall be according to EN 13611:2019, Clause 5.
6 Design and construction
6.1 General
Shall be according to EN 13611:2019, 6.1.
6.2 Mechanical parts of the control
6.2.1 Appearance
Shall be according to EN 13611:2019, 6.2.1.
6.2.2 Holes
Shall be according to EN 13611:2019, 6.2.2.
6.2.3 Breather holes
6.2.3.1 Requirements
Shall be according to EN 13611:2019, 6.2.3.1 with the following addition:
If the vented capacity is greater than 70 dm /h of air, a connection for a vent pipe shall be provided.
6.2.3.2 Test for leakage of breather holes
Shall be according to EN 13611:2019, 6.2.3.2.
6.2.4 Screwed fastenings
Shall be according to EN 13611:2019, 6.2.4.
6.2.5 Jointing
Shall be according to EN 13611:2019, 6.2.5.
6.2.6 Moving parts
Shall be according to EN 13611:2019, 6.2.6.
6.2.7 Sealing caps
Shall be according to EN 13611:2019, 6.2.7.
6.2.8 Dismantling and reassembly
Shall be according to EN 13611:2019, 6.2.8.
6.2.9 Auxiliary canals and orifices
Shall be according to EN 13611:2019, 6.2.9.
6.2.10 Presetting device
Shall be according to EN 13611:2019, 6.2.10.
6.2.101 External visual indication of the position of the closure member
If an external visual device to indicate the closure member position is fitted to an SSD, it shall clearly
indicate whether it is in the open or closed position.
6.2.102 Parts transmitting actuating forces
Parts transmitting actuating forces shall be metallic and designed with a safety factor of ≥ 3 against
permanent deformation.
6.2.103 Adjustments
The adjustments (e.g. outlet pressure, offset and gas/air ratio) shall be readily accessible to authorized
personal, but there shall be provision for sealing after adjustment. Means shall be provided to discourage
interference by unauthorized personal. If it is stated in the instructions that a pressure regulator can be
put out of action, appropriate means shall be provided to put the pressure regulator out of action, and the
information how to do this shall be given in the instructions.
6.2.104 Integral safety shut-off device
An integral safety shut-off device shall be functionally independent from the pressure regulator.
This requirement is met if the function of the safety shut-off device is not affected in the event of failure
and/or loss of functionality of one or more of the following pressure regulator components:
— control member;
— seat ring (see Figures AA.1 to AA.3);
— actuator;
— casing of actuator;
— controller;
— pilot (for pilot-controlled pressure regulator types);
— sensing and process lines.
If the pressure regulator incorporates more than one safety device the functional independence shall be
met by each device.
When the integral safety shut-off device utilizes pipework gas as a source of energy for its operation this
shall be taken from upstream pipework of the pressure regulator. For any kind of pneumatic automation
system there shall be no bypass around the safety shut-off device, also taking fault conditions into
account.
6.2.105 Resistance to pressure
6.2.105.1 Requirements
Parts of the pressure regulator that are subjected to inlet pressure under normal operating conditions,
or could be subjected to inlet pressure in the event of a failure, shall resist a pressure equal to the
maximum allowable pressure PS (see 3.125) multiplied by the safety factor f.
Following safety factors in Table 1 shall be used:
Table 1 — Minimum values of the safety factor f
Group of materials Minimum value of the safety factor f
For parts of the body stressed
by forces from torque and
bending moments (pipelines)
only
Rolled and forged steel 1,70 2,13
Cast steel 2,00 2,50
Spheroidal graphite cast iron 2,50 3,13
and malleable cast iron
Copper-zinc wrought alloys 2,00 2,50
and aluminium alloys
Copper-tin cast alloys and 2,50 3,13
copper-zinc cast alloys
Aluminium cast alloys 2,50 3,13
A 4 %
min
Aluminium cast alloys 3,20 4,00
A 1,5 %
min
6.2.105.2 Test
The hydrostatic pressure test is conducted after leakage and function tests. A pressure of f times the
maximum allowable pressure (PS) is applied to the control for a minimum of 5 min.
After the test there shall be no visible damage.
6.2.106 Signal tube connections
Requirements on connections for gas pressure, air pressure or furnace pressure signal lines shall be
stated in the instructions.
Gas carrying lines shall be made of metal. Condensation in signal lines shall not lead to blocked signals.
6.2.107 Creep relief device
A creep relief device shall only be built into a spring-operated pressure regulator to vent the gas to the
atmosphere when the controlled pressure is higher than the lock-up pressure of the pressure regulator
with a limited capacity, and is an integral part of the spring-operated pressure regulator. Creep relief
devices shall not be built in a control member of a safety shut-off device, and shall be according to
requirements and tests given in Annex CC.
6.3 Materials
6.3.1 General material requirements
Shall be according to EN 13611:2019, 6.3.1 with the following addition:
Closure members shall conform to EN 13611:2019, Annexes F to H.
Elastomers and vulcanized rubber shall conform to 7.5.1.
6.3.2 Housing
6.3.2.1 Requirements
Shall be according to EN 13611:2019, 6.3.2.1 with the following addition:
Materials shall conform to EN 13611:2019, Annexes F to H.
6.3.2.2 Test
Shall be according to EN 13611:2019, 6.3.2.2.
6.3.3 Zinc alloys
EN 13611:2019, 6.3.3 is replaced by:
Zinc alloys shall not be used.
6.3.4 Springs
Shall be according to EN 13611:2019, 6.3.4.
6.3.5 Resistance to corrosion and surface protection
Shall be according to EN 13611:2019, 6.3.5.
6.3.6 Impregnation
Shall be according to EN 13611:2019, 6.3.6.
6.3.7 Seals for glands for moving parts
Shall be according to EN 13611:2019, 6.3.7.
6.4 Gas connections
Shall be according to EN 13611:2019, 6.4.
6.5 Electrical parts of the control
6.5.1 General
Shall be according to EN 13611:2019, 6.5.1.
6.5.2 Switching elements
EN 13611:2019, 6.5.2 is not applicable.
6.5.3 Electrical components
EN 13611:2019, 6.5.3 is not applicable.
6.6 Protection against internal faults for the purpose of functional safety
EN 13611:2019, 6.6 is not applicable.
7 Performance
7.1 General
Shall be according to EN 13611:2019, 7.1.
7.2 Leak-tightness
7.2.1 Requirements
Shall be according to EN 13611:2019, 7.2.1.
7.2.2 Tests
7.2.2.1 General
Shall be according to EN 13611:2019, 7.2.2.1.
7.2.2.2 External leak-tightness
Shall be according to EN 13611:2019, 7.2.2.2 with the following addition:
For external leakage perform the test with 1,5 times the maximum inlet pressure at inlet and outlet, and
with a pressure of 1,5 times the difference between the maximum inlet pressure and the maximum outlet
pressure on the atmospheric side of the working diaphragm (including the safety diaphragm, if any).
The test results shall meet the requirements of 7.2.1.
7.2.2.3 Internal leak-tightness
EN 13611:2019, 7.2.2.3 is replaced by the following:
This test is only applicable for SSDs and shall be performed with the pressure regulator, if any, in the open
position.
With any closure member in the closed position, pressurize the inlet of the pressure regulator in the
direction of gas flow indicated, to two different pressures, 10 kPa and 1,5 times the maximum inlet
pressure, and measure the leakage rate.
The internal leakage test of the assembled SSD and its fixtures shall be performed with two different
pressures, 10 kPa and 1,5 times the maximum inlet pressure, upstream of the closure member and at
atmospheric pressure downstream of the closure member.
The test results shall meet the requirements of 7.2.1.
7.3 Torsion and bending
Shall be according to EN 13611:2019, 7.3 with the following addition:
Pressure regulators shall fulfil Group 2 classification.
7.4 Rated flow rate
7.4.1 Requirements
Shall be according to EN 13611:2019, 7.4.1 with the following addition:
The requirement for the rated flow rate is only applicable for safety shut-off devices without pressure
regulator.
7.4.2 Test
Shall be according to EN 13611:2019, 7.4.2 with the following addition:
If rated flow rate for pressure regulators as stated in the instructions is specified for the control member
in the fully open position, the test shall be performed with the control member in that position.
7.4.3 Conversion of air flow rate
Shall be according to EN 13611:2019, 7.4.3.
7.5 Durability
7.5.1 Elastomers in contact with gas
Shall be according EN 13611:2019, 7.5.1 with the following addition:
Elastomers in contact with gas (e.g. valve pads, O-rings, diaphragms and lip seals) shall conform to those
requirements given in EN 549:2019 or EN 682:2002, respectively.
7.5.2 Marking
Shall be according to EN 13611:2019, 7.5.2.
7.5.3 Resistance to scratching
Shall be according to EN 13611:2019, 7.5.3.
7.5.4 Resistance to humidity
Shall be according to EN 13611:2019, 7.5.4.
7.6 Performance tests for electronic controls
EN 13611:2019, 7.6 is not applicable.
7.7 Long-term performance for electronic controls
EN 13611:2019, 7.7 is not applicable.
7.8 Data exchange
EN 13611:2019, 7.8 is not applicable.
7.101 Pressure regulator performance
7.101.1 General
If more than one function exists (e.g. pressure regulator and integral safety shut-off device) the
performance of each function shall be considered separately.
If the pressure regulator has built-in safety device(s) it shall be tested with the safety device(s) in its
(their) normal operating position(s).
The external sensing/process lines shall be located on the downstream pipework as stated in the
instructions.
7.101.2 General test procedure
7.101.2.1 Apparatus
The tests shall be performed on a test rig built as specified in Figure 2 or in accordance with
EN 60534-2-3:2016, Figure 2. The nominal diameter of the pipework connecting the pressure regulator
inlet and the flow rate regulating valves with the pressure regulator shall not be smaller than the nominal
diameter of the pressure regulator and so chosen as to ensure that in all operating conditions of the tests
the velocity of th
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