UNI EN 13785 : 2009
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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
04-07-2013
01-01-2009
Foreword
1 Scope
2 Normative references
3 Terms and definitions
3.1 General terms and definitions
3.2 Terms and definitions concerning gas
3.3 Terms and definitions concerning pressures
3.4 Terms and definitions concerning rates
4 Types of regulators
4.1 Introduction
4.2 Regulators for installations where the final
regulator supplies a pressure specified in
EN 437
4.3 Other regulators
5 Constructional characteristics
5.1 General
5.2 Materials
5.3 Special requirements
5.3.1 Pressure sensing subassembly
5.3.2 Regulation subassembly
5.3.3 Back pressure subassembly
5.3.4 Connection subassembly
5.4 Mechanical strength
5.4.1 Resistance to impact
5.4.2 Resistance to pressure
5.4.3 Strength of connections
5.5 Soundness
5.6 Mechanical endurance
5.6.1 General requirements
5.6.2 Special requirements
5.7 Resistance to humidity changes
5.8 Resistance to corrosion
6 Performance characteristics
6.1 General
6.1.1 Introduction
6.1.2 Supply pressure
6.1.3 Regulated pressure
6.2 Supply pressure and regulated pressure
according to 4.2
6.2.1 Single stage fixed regulator for
EN 437 pressures
6.2.2 Two stages fixed or adjustable
regulators for EN 437 pressures
6.2.3 Three stages fixed or adjustable
regulators for EN 437 pressures
6.3 Variable regulators
6.4 Regulators out of the pressures of EN 437
7 Test methods
7.1 General conditions
7.1.1 Type of test gas
7.1.2 Test conditions
7.1.3 Equivalence formulas
7.1.4 Test samples
7.2 Verification of constructional characteristics
7.2.1 Resistance to impact
7.2.2 Resistance to pressure
7.2.3 Mechanical strength of connections
7.2.4 Regulation subassembly
7.2.5 Soundness
7.2.6 Mechanical endurance
7.2.7 Resistance to humidity changes
7.2.8 Resistance to corrosion
7.3 Verification of performance characteristics
7.3.1 General
7.3.2 Plotting of the performance curves
8 Marking, packaging, instructions
8.1 General
8.2 Marking of the regulator
8.3 Packaging
8.4 Instructions for installation, use and maintenance
Annex A (normative) - Special requirements for regulators
fitted with pressure or rate operated safety
devices
A.1 Regulators fitted with an over-pressure relief
A.1.1 Definition
A.1.2 Constructional characteristics
A.1.3 Performance characteristics
A.1.4 Test methods
A.1.5 Regulator marking
A.2 Regulators fitted with an over-pressure shut
off safety valve
A.2.1 Definition
A.2.2 Constructional characteristics
A.2.3 Performance characteristics
A.2.4 Test methods
A.3 Regulators fitted with an under-pressure shut
off safety device
A.3.1 Definition
A.3.2 Constructional and performance
characteristics
A.3.3 Test methods
A.4 Regulators fitted with an excess flow valve
A.4.1 Definition
A.4.2 Performance characteristics
A.4.3 Test methods
A.4.4 User and maintenance instructions
A.5 Regulators fitted with a regulated pressure
limiter
A.5.1 Definition
A.5.2 Constructional and performance
characteristics
A.5.3 Test methods
A.5.4 User and maintenance instructions
Annex B (normative) - Special requirements for
regulators fitted with a thermal cut out
B.1 Definition
B.2 Constructional characteristics
B.3 Performance characteristics
B.4 Test methods
Annex C (normative) - Special requirements for low
pressure regulators under extreme temperature
conditions (temperatures below -20 degrees C)
Annex D (normative) - Method for measuring leaks at
test pressures less than or equal to 16 bar
D.1 Scope
D.2 Diagram of the test bench
D.3 Coefficient K
D.3.1 Method
D.3.2 Calculations
D.4 Measurement of the leak
D.4.1 Method
D.4.2 Calculations
D.5 Checks
Annex E (normative) - Complementary test requirements
for non metallic thermoplastic or thermal
setting materials used in the construction
of regulators
E.1 Scope
E.2 Materials
E.3 Special conditions for carrying out the
tests mentioned in the body of the document
E.3.1 Resistance to impact
E.3.2 Mechanical resistance of connections
E.3.3 Soundness
E.4 Special requirements
E.4.1 Resistance to hydrocarbons
E.4.2 Resistance to cracking under stress
and when chemical agents are present
E.4.3 Characteristics relating to fire
resistance
E.4.4 Accelerated ageing
E.5 Sampling and order of tests
Annex F (normative) - Requirements for elastomeric
reinforced diaphragms
Annex G (normative) - Inlet connections
Annex H (normative) - Outlet connections
Annex I (informative) - Test method for resistance
to corrosion
I.1 Principle
I.2 Reagents
I.2.1 Saline solution
I.2.2 Compressed air
I.2.3 Salt mist
I.3 Apparatus
I.3.1 Spraying chamber
I.3.2 Sprayers
I.3.3 Heating device
I.3.4 Salt solution supply device
I.3.5 Compressed air supply device
I.3.6 Mist collectors
I.4 Test method
I.4.1 Method of exposure of regulators
I.4.2 Duration of tests
I.4.3 Checks
I.4.4 Cleaning of regulators
I.5 Results
Annex ZA (informative) - Relationship between this
European Standard and the Essential Requirements
of EU Directive 90/396/EEC
Bibliography
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