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 and associated safety devices

This European Standard specifies the safety, construction and performance requirements for pneumatic pressure regulators and safety devices, intended for use with gas burners, gas appliances and similar use, hereafter referred to as ‘pressure regulators’.
This European Standard is applicable to:
⎯ pressure regulators with declared maximum inlet pressure above 50 kPa up to and including 500 kPa, of nominal connection size up to and including DN 250 for use with one or more fuel gases in accordance with EN 437,
⎯ pressure regulators incorporating safety devices,
⎯ pressure regulators incorporating safety devices specified as safety accessories,
NOTE For safety accessories and pressure accessories, the requirements of prEN 13611:2012, Annex F also apply.
⎯ pressure regulators which use auxiliary energy,
Pressure regulators intended to be used on pipe work installations for third family gases are also covered by EN 13785 and EN 13786.
This European Standard is not applicable to:
⎯ pressure regulators that are connected directly to mains pipe-work 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,
⎯ safety devices which use auxiliary energy.

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

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 et dispositifs de sécurité associés

La présente Norme européenne 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 ».
La présente Norme européenne peut être appliquée :
-   aux régulateurs de pression dont la pression amont maximale comprise entre 50 kPa et 500 kPa, de diamètre nominal de raccordement inférieur ou égal à DN 250, et conçus pour une utilisation avec un ou plusieurs des gaz en conformité avec l’EN 437 ;
-   aux régulateurs de pression à dispositifs de sécurité intégrés ;
-   aux régulateurs de pression 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.
NOTE     Les régulateurs de pression autonomes comportant une seule fonction (c'est-à-dire la régulation de la pression aval) ne sont pas couverts par l'EN 126.
La présente Norme européenne n'est pas applicable 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 ;
-   régulateurs de pression conçus pour des appareils à gaz qui doivent être installés à l'air libre et exposés à l'environnement ;
-   dispositifs de sécurité qui utilisent une énergie auxiliaire.

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

General Information

Status
Not Published
Public Enquiry End Date
09-Mar-2015
Current Stage
98 - Abandoned project (Adopted Project)
Start Date
07-Apr-2020
Due Date
12-Apr-2020
Completion Date
07-Apr-2020

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SLOVENSKI STANDARD
oSIST prEN 88-2:2015
01-februar-2015
9DUQRVWQHLQQDG]RUQHQDSUDYH]DSOLQVNHJRULOQLNHLQSOLQVNHDSDUDWHGHO

7ODþQLUHJXODWRUML]DYVWRSQHWODNHQDGN3DGRYNOMXþQRN3DLQSULSDGDMRþH

YDUQRVWQHQDSUDYH

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 and associated

safety devices

Sicherheits- und Regeleinrichtungen für Gasbrenner und Gasgeräte - Teil 2: Druckregler

für Eingangsdrücke über 50 kPa bis einschließlich 500 kPa und dazugehörigen
Sicherheitseinrichtungen

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 et dispositifs de sécurité associés
Ta slovenski standard je istoveten z: prEN 88-2 rev
ICS:
23.060.40 7ODþQLUHJXODWRUML Pressure regulators
oSIST prEN 88-2:2015 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
oSIST prEN 88-2:2015
---------------------- Page: 2 ----------------------
oSIST prEN 88-2:2015
EUROPEAN STANDARD
DRAFT
prEN 88-2 rev
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2014
ICS 23.060.40 Will supersede 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 and associated safety
devices

Dispositifs de sécurité et de contrôle pour les brûleurs à gaz Sicherheits- und Regeleinrichtungen für Gasbrenner und

et appareils utilisant des combustibles gazeux - Partie 2: Gasgeräte - Teil 2: Druckregler für Eingangsdrücke über 50

Régulateurs de pression pour pressions amont comprises kPa bis einschließlich 500 kPa und dazugehörigen

entre 50 kPa et 500 kPa et dispositifs de sécurité associés Sicherheitseinrichtungen

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 58.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United

Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to

provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and

shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2014 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 88-2 rev:2014 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
oSIST prEN 88-2:2015
prEN 88-2:2014 (E)
Contents
Page

Foreword ..............................................................................................................................................................4

1 Scope ......................................................................................................................................................7

2 Normative references ............................................................................................................................7

3 Terms and definitions ...........................................................................................................................8

4 Classification ....................................................................................................................................... 12

5 Units of measurement and test conditions ...................................................................................... 12

6 Design and construction .................................................................................................................... 13

7 Performance requirements ................................................................................................................ 16

8 Electrical requirements ...................................................................................................................... 29

9 Electromagnetic compatibility (EMC) ............................................................................................... 29

10 Marking, installation and operating instructions ............................................................................ 29

Annex A (informative) Void ............................................................................................................................ 31

Annex B (informative) Leak-tightness test for gas controls – volumetric method .................................. 32

Annex C (informative) Leak-tightness test for gas controls – pressure loss method ............................ 33

Annex D (normative) Conversion of pressure loss into leakage rate ....................................................... 34

Annex E (normative) Electrical/electronic component fault modes .......................................................... 35

Annex F (normative) Additional requirements for safety accessories and pressure accessories

as defined in EU Directive 97/23/EC.................................................................................................. 36

Annex G (normative) Materials for pressurized parts ................................................................................. 37

Annex H (normative) Additional materials for pressurized parts .............................................................. 38

Annex I (normative) Requirements for controls used in DC supplied burners and appliances

burning gaseous or liquid fuels ........................................................................................................ 39

Annex J (normative) Method for the determination of a Safety integrity level (SIL) ............................... 40

Annex K (normative) Method for the determination of a Performance Level (PL) ................................... 41

Annex L (informative) Relationship between Safety Integrity Level (SIL) and Performance Level

(PL) ....................................................................................................................................................... 42

Annex M (normative) Reset functions .......................................................................................................... 43

Annex N (informative) Guidance document on Environmental Aspects .................................................. 44

Annex O (normative) Seals of elastomer, cork and synthetic fibre mixtures........................................... 45

Annex AA (informative) Typical pressure regulators and pressure regulator parts ............................... 46

Annex BB (informative) Overview of requirements and test conditions (as given in Clause 7), and

examples of performance curves for pressure regulators ............................................................. 49

Annex CC (normative) Creep relief device ................................................................................................... 52

Annex DD (informative) Comparison between EN 334:2012-05 and EN 88-2:2013-04 ............................ 54

Annex ZA (informative) Relationship between this European Standard and the Essential

Requirements of EU Directive 2009/142/EC relating to appliances burning gaseous fuels ....... 55

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oSIST prEN 88-2:2015
prEN 88-2:2014 (E)

Annex ZB (informative) Relationship between this European Standard and the Essential

Requirements of EU Directive 97/23/EC concerning pressure equipment .................................... 57

Bibliography ...................................................................................................................................................... 59

Figures

Figure 1 — Performance test apparatus ............................................................................................................ 19

Figure 2 — Graphical representation of 7.101.2.5.2 .......................................................................................... 22

Figure 3 — Performance test apparatus for SSDs ............................................................................................. 25

Figure 4 — Measurement of response time ....................................................................................................... 27

Figure AA.1 — Example of a direct acting regulator .......................................................................................... 46

Figure AA.2 — Example of regulator using auxiliary energy .............................................................................. 47

Figure AA.3 — Example of a pilot controlled regulator ...................................................................................... 47

Figure AA.4 — Example of a direct acting safety shut-off device ...................................................................... 48

Figure BB.1 — Example for pressure regulator including maximum outlet pressure variations for constant

outlet setting pressure p and lock-up pressure p including typical results ........................................... 50

2s 2f

Figure BB.2 — Example for pressure regulator including maximum outlet pressure variations for adjustable

outlet setting pressures p , p , and lock-up pressures p , p , including typical results

2smin 2smax 2fmin 2fmax

..................................................................................................................................................................... 51

Tables

Table 1 — Minimum value of safety factor F ...................................................................................................... 15

Table 2 — Accuracy classes .............................................................................................................................. 20

Table 3 — Lock-up pressure classes ................................................................................................................. 21

Table 4 — Specified accuracy classes for over- and under-pressure shut-off devices ..................................... 24

Table BB.1 — Setting and performance ............................................................................................................. 49

Table DD.1 — Comparison between EN 334:2005+A1:2009 and prEN 88-2:2013 .......................................... 54

Table ZA.1 — Correspondence between this European Standard and Directive 2009/142/EC relating to

appliances burning gaseous fuels ............................................................................................................... 55

Table ZB.1 — Correspondence between this European Standard and Directive 97/23/EC concerning pressure

equipment .................................................................................................................................................... 57

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oSIST prEN 88-2:2015
prEN 88-2:2014 (E)
Foreword

This document (prEN 88-2:2014) 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 document is currently submitted to the CEN Enquiry.
This document will supersede EN 88-2:2007.

This document has been prepared under a mandate given to CEN by the European Commission and the

European Free Trade Association, and supports essential requirements of EU Directive(s).

For relationship with EU Directive(s), see informative Annex ZA and ZB, which is an integral part of this

document.
For this European Standard a transition period of 3 years is proposed.

It should be noted that the following significant technical changes compared to the previous edition have been

incorporated in this European Standard:
a) scope enlarged to “Pressure regulators incorporating safety devices";
b) alignment with prEN 13611:2012;

c) requirements and tests added for pressure regulators which use auxiliary energy;

d) classifications according to accuracy, lock-up, and overpressure shut-off added;

e) clause 6 enlarged to “Design and construction”;
f) clause 6.2.104 “Integral safety shut-off device” added;
g) clause 6.2.105 “Resistance to pressure” added;
h) clause 6.2.107 “Creep relief device” added;
i) clause 7.3 “Test for leak-tightness”, new value for test pressure;
j) design of all Figures adapted to design of Figures in EN 13611;
k) annex BB “Overview of requirement and test conditions” added;
l) annex CC “Creep relief device” added;
m) annex DD “Comparison between EN 334:2012 and EN 88-2:2013” added.

EN 88 consists of the following parts, under the general title Pressure regulators and associated safety

devices for gas appliances:
 Part 1: Pressure regulators for inlet pressures up to and including 50 kPa

 Part 2: Pressure regulators for inlet pressure above 50 kPa up to and including 500 kPa and associated

safety devices
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oSIST prEN 88-2:2015
prEN 88-2:2014 (E)

Performance Level (PL) or Safety Integrity Level (SIL) classifications according to EN ISO 13849-1 or

EN 61508-1 cannot automatically be claimed based upon compliance with this European Standard. Pressure

regulators with SIL classification do not meet automatically the requirements of this standard.

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oSIST prEN 88-2:2015
prEN 88-2:2014 (E)
Introduction

This standard is a particular standard for Pressure Regulators for gas-burners and gas-burning appliances

which cites the generic requirements of prEN 13611:2012 wherever possible. This standard supplements or

modifies the corresponding clauses of prEN 13611:2012. The construction and performance requirements are

as far as applicable in total conformity with prEN 13611:2012.

This document is intended to be used in conjunction with prEN 13611:2012. This document refers to clauses

of prEN 13611:2012 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 European Standard adds

clauses or sub-clauses to the structure of prEN 13611:2012 which are particular to this European Standard. It

should be noted that these clauses and sub-clauses are not indicated as an addition. Subclauses or annexes

which are additional to those in prEN 13611:2012 are numbered starting from 101 or are designed as

Annex AA, BB, CC, etc..
---------------------- Page: 8 ----------------------
oSIST prEN 88-2:2015
prEN 88-2:2014 (E)
1 Scope

This European Standard specifies the safety, construction and performance requirements for pneumatic

pressure regulators and safety devices, intended for use with gas burners, gas appliances and similar use,

hereafter referred to as ‘pressure regulators’.
This European Standard is applicable to:

 pressure regulators with declared maximum inlet pressure above 50 kPa up to and including 500 kPa, of

nominal connection size up to and including DN 250 for use with one or more fuel gases in accordance

with EN 437,
 pressure regulators incorporating safety devices,

 pressure regulators incorporating safety devices specified as safety accessories,

NOTE For safety accessories and pressure accessories, the requirements of prEN 13611:2012, Annex F also

apply.
 pressure regulators which use auxiliary energy,

Pressure regulators intended to be used on pipe work installations for third family gases are also covered by

EN 13785 and EN 13786.
This European Standard is not applicable to:

 pressure regulators that are connected directly to mains pipe-work 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,
 safety devices which use auxiliary energy.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated references,

the latest edition of the referenced document (including any amendments) applies.

EN 88-1:2011, Pressure regulators and associated safety devices for gas appliances — Part 1: Pressure

regulators for inlet pressures up to and including 50 kPa

EN 549, Rubber materials for seals and diaphragms for gas appliances and gas equipment

EN 682, Elastomeric seals — Materials requirements for seals used in pipes and fittings carrying gas and

hydrocarbon fluids
EN 12267:1999, Industrial valves — Butt welding ends for steel valves

prEN 13611:2012, Safety and control devices for burners and appliances burning gaseous and/or liquid

fuels — General requirements

EN 13785+A1:2008, Regulators with a capacity of up to and including 100 kg/h, having a maximum nominal

outlet pressure of up to and including 4 bar, other than those covered by EN 12864 and their associated

safety devices for butane, propane or their mixtures
---------------------- Page: 9 ----------------------
oSIST prEN 88-2:2015
prEN 88-2:2014 (E)

EN 13786:2010, Automatic change-over valves having a maximum outlet pressure of up to and including

4 bar with a capacity of up to and including 100 kg/h, and their associated safety devices for butane, propane

or their mixtures

EN 13787, Elastomers for gas pressure regulators and associated safety devices for inlet pressures up to

100 bar

EN 13906-1:2002, Cylindrical helical springs made from round wire and bar — Calculation and design —

Part 1: Compression springs

EN 13906-2:2001, Cylindrical helical springs made from round wire and bar — Calculation and design —

Part 2: Extension springs

EN 60534-2-3, Industrial-process control valves — Part 2-3: Flow capacity — Test procedures

(IEC 60534-2-3:1997)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in prEN 13611:2012 and the following

apply.
3.101
pressure regulator

device that maintains the outlet pressure constant independent of the variations in inlet pressure and/or flow

rate within defined limits
[SOURCE: EN 88-1:2011, 3.101]
3.102
control member

movable part of the pressure regulator which varies flow rate and/or outlet pressure directly

[SOURCE: EN 88-1:2011, 3.107]
3.103
safety shut-off device
SSD

device whose function is to stay 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
valve seat

corresponding sealing surfaces within a pressure regulator or SSD that make full contact only when the

pressure regulator or SSD is in the closed position
3.106
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

3.107
actuator

device or mechanism which changes the signal from the controller into a corresponding movement controlling

the position of the control member
---------------------- Page: 10 ----------------------
oSIST prEN 88-2:2015
prEN 88-2:2014 (E)
3.108
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 control member are not covered by this definition.

3.109
pressure containing parts
parts 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.
3.110
signal connection

part that is used to convey pressure from part of an installation to the signal chamber

3.111
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
3.112
fixtures

functional devices connected to the main components of the pressure regulator or SSD

3.113
exhaust line

line to atmosphere between the regulator or fixtures for the safe venting of gas in the event of a component

failure
3.114
trip mechanism
mechanism that releases the closure member when activated by the controller
3.115
SSD-actuator
device that is activated by the trip mechanism which shuts the closure member
3.116
relatching device
device that enables the complete opening of an SSD
3.117
motorization chamber

chamber at the higher pressure of two chambers under pressure within the housing of actuator

3.118
monitored pressure
pressure monitored and safeguarded by the SSD
3.119
trip pressure
pressure value at which the closing member starts to move
3.120
upper trip pressure p
upper limit of the monitored pressure (over-pressure)
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oSIST prEN 88-2:2015
prEN 88-2:2014 (E)
3.121
lower trip pressure
lower limit of the monitored pressure (under pressure)
3.122
outlet setting pressure
outlet pressure at which the pressure regulator is set for test purposes
[SOURCE: EN 88-1:2011, 3.113]
3.123
maximum outlet pressure
2max

upper limit of the outlet pressure, as stated in the installation and operating instructions

[SOURCE: EN 88-1:2011, 3.109]
3.124
minimum outlet pressure
2min

lower limit of the outlet pressure, as stated in the installation and operating instructions

[SOURCE: EN 88-1:2011, 3.110]
3.125
outlet pressure range
difference between minimum and maximum values of the outlet pressure
[SOURCE: EN 88-1:2011, 3.111]
3.126
steady state value
outlet pressure measured after step response (control signal remains constant)
[SOURCE: EN 88-1:2011, 3.127]
3.127
settling tolerance

maximum difference between the current outlet pressure and its steady state value

[SOURCE: EN 88-1:2011, 3.128]
3.128
regulation tolerance
settling tolerance, expressed as a percentage of the outlet setting pressure
3.129
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).
---------------------- Page: 12 ----------------------
oSIST prEN 88-2:2015
prEN 88-2:2014 (E)
3.130
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.
3.131
accuracy

percentage of the outlet pressure relative to the outlet setting pressure within the operation range

3.132
accuracy class
maximum permissible value of the accuracy
3.133
inlet pressure range
difference between the minimum and maximum values of the inlet pressure
[SOURCE: EN 88-1:2011, 3.108]
3.134
lock-up time

time taken for the control member to move from an open position to the closed position

3.135
lock-up pressure

outlet pressure at which a pressure regulator closes when the outlet of the pressure regulator is sealed

[SOURCE: EN 88-1:2011, 3.120]
3.136
lock-up pressure class

maximum permissible positive difference between the actual lock-up pressure(s) p and the corresponding

outlet setting pressure(s) at a certain percentage of the maximum rated flow rate q expressed as a

max
percentage of the outlet setting pressure

Note 1 to entry: The lock-pressure pressure class, SG, is given by the following equation:

(p − p )
2f 2
SG= 100⋅
[1]
where
SG is the lock-up pressure class;
p is the lock-up pressure; and
p is the outlet setting pressure.
---------------------- Page: 13 ----------------------
oSIST prEN 88-2:2015
prEN 88-2:2014 (E)
3.137
maximum allowable pressure

maximum pressure for which the pressure regulator and/or SSD is designed as stated in the installation and

operating instructions

Note 1 to entry: In accordance with the strength requirements of this European Standard.

3.138
limit pressure

pressure at which yielding becomes apparent in any component of the pressure regulator or its fixtures

3.139
safety factor
S , S

ratio of the value of the limit pressure p to the value of the maximum allowable pressure PS

Note 1 to entry: This term applies to two separate discrete regions of the pressure regulator:

 applied to the pressure regulator housing: S ;
 applied to the other pressure containing parts of the pressure regulator: S
4 Classification
4.1 Classes of control
prEN 13611:2012, 4.1 is replaced by the following:

Pressure regulators shall be classified according to regulator accuracy (7.101.2.4) AC 1, AC 2,5, AC 5, AC 10,

and AC 20, according to lock-up pressure (7.101.2.5) SG 5, SG 10, SG 20, and SG 30, and according to

overpressure shut-off accuracy (7.102.1) AG 5, AG 10, AG 20, and AG 30.
4.2 Groups of control
Shall be according to prEN 13611:2012, 4.2 with the following addition:
Pressure regulators shall fulfil Group 2 classification.
4.3 Classes of control function
prEN 13611:2012, 4.3 is not applicable.
4.4 Types of DC supplied controls
prEN 13611:2012, 4.4 is not applicable.
5 Units of measurement and test conditions
Shall be according to prEN 13611:2012, Clause 5.
---------------------- Page: 14 ----------------------
oSIST prEN 88-2:2015
prEN 88-2:2014 (E)
6 Design and construction
6.1 General
Shall be according to prEN 13611:2012, 6.1 with the following addition:

If in the event of a failure (e.g. of a diaphragm) leakage is possible, a tapping connection of at least DN 8 for

an exhaust line shall be provided.
6.2 Mechanical parts of the control
6.2.1 Appearance
Shall be according to prEN 13611:2012, 6.2.1.
6.2.2 Holes
Shall be according to prEN 13611:2012, 6.2.2.
6.2.3 Breather holes
Shall be according to prEN 13611:2012, 6.2.3 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.

6.2.4 Test for leakage of breather holes
Shall be according to prEN 13611:2012, 6.2.4.
6.2.5 Screwed fastenings
Shall be according to prEN 13611:2012, 6.2.5.
6.2.6 Jointing
Shall be according to prEN 13611:2012, 6.2.6.
6.2.7 Moving parts
Shall be according to prEN 13611:2012, 6.2.7.
6.2.8 Sealing caps
Shall be according to prEN 13611:2012, 6.2.8.
6.2.9 Dismantling and reassembly
Shall be according to prEN 13611:2012, 6.2.9.
6.2.10 Auxiliary canals and orifices
Shall be according to prEN 13611:2012, 6.2.10.
6.2.11 Presetting device
Shall be according to prEN 13611:2012, 6.2.11.
---------------------- Page: 15 ----------------------
oSIST prEN 88-2:2015
prEN 88-2:2014 (E)
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 authorised

persons, but there shall be provision for sealing after adjustment. Means shall be provided to discourage

interference by unauthorised persons. If it is stated in the installation and operating instructions that a

pressure regulator can be put out of action, appropriate means shall be provided to put the pressure regulator

out of action.
6.2.104 Integral safety shut-off device

An integral safety shut-off device shall be functionally independent from the 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 regular components:
 Control member;
 Seat ring;
 Actuator;
 Casing of actuator;
 Controller;
 Pilot (for pilot-controlled regulator types);
 Sensing and process lines.

If the regulator incorporates more than one safety device the functional independence shall be met

...

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