I.S. EN 334:2005
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
GAS PRESSURE REGULATORS FOR INLET PRESSURES UP TO 100 BAR
Hardcopy , PDF
09-10-2019
English
01-01-2005
For Harmonized Standards, check the EU site to confirm that the Standard is cited in the Official Journal.
Only cited Standards give presumption of conformance to New Approach Directives/Regulations.
Foreword
1 Scope
2 Normative references
3 Terms, definitions and symbols
3.1 General terms and definitions of types of gas pressure
regulators
3.2 Terms and definitions of components of gas pressure
regulators
3.3 Terms, symbols and definitions of components of
functional performance
3.4 Terms, symbols and definitions related to design
and tests
4 Construction requirements
4.1 Basic requirements
4.1.1 General
4.1.2 Gas pressure regulators with associated safety
devices
4.1.3 End connections
4.1.4 Flange ratings
4.1.5 Nominal sizes and face-to-face dimensions
4.1.6 Sealing of the adjusting device
4.1.7 Springs
4.1.8 Replaceable parts that amy be affected by
erosion or abrasion
4.2 Materials
4.2.1 Requirements for metallic materials
4.2.2 Requirements for elastomers (including
vulcanized rubbers)
4.2.3 Requirements for non metallic materials
different from those in 4.2.2
4.3 Strength of housings
4.3.1 Body and its inner metallic partition walls
4.3.2 Flanges
4.3.3 Other pressure containing parts
4.3.4 Inner metallic partition walls
4.3.5 Minimum values of safety factor
4.3.6 Welded joint coefficient
5 Functional requirements
5.1 General
5.1.1 Mounting position
5.1.2 Sound emission
5.2 Shell strength, external tightness and internal sealing
5.2.1 Shell strength
5.2.2 External tightness
5.2.3 Internal sealing
5.3 Control classifications
5.3.1 Accuracy under stable conditions
5.3.2 Lock-up behaviour
5.3.3 Stable conditions
5.4 Final visual inspection
5.5 Fail-close conditions
6 Gas pressure regulator sizing
6.1 Flow behaviour
6.2 Sizing equations for the calculation of volumetric
flow rates of a gas pressure regulator with its
control member in its mechanically fully open position
6.2.1 Normal calculations
6.2.2 Practical calculations
6.2.3 Simplified calculations
6.3 Calculation of the maximum accuracy flow rate
6.4 Inherent flow characteristics
6.5 Calculation of volumetric flow rates for partially
open gas pressure regulators
6.6 Flow coefficient
7 Testing
7.1 General
7.2 Tests
7.3 Type test
7.4 Selection of test samples
7.5 Routine tests
7.6 Production surveillance
7.7 Test and verification methods
7.7.1 Dimensional check and visual inspection
7.7.2 Materials check
7.7.3 Verification of the strength of pressure
containing parts and inner metallic partition
walls
7.7.4 Shell and inner metallic partition walls
strength test
7.7.5 Alternative shell and inner metallic partition
walls strength test
7.7.6 External tightness test
7.7.7 Functional tests
7.7.8 Final visual inspection
8 Documentation
8.1 Documentation related to type test
8.1.1 Documentation required prior to type test
8.1.2 Test report
8.2 Documentation related to the routine tests
8.2.1 Documentation provided at the request of the
customer
8.2.2 Documentation provided with the regulator
8.3 Documentation related to production surveillance
in accordance with 7.6
8.3.1 Documentation to be available for production
surveillance
8.3.2 Production surveillance report
9 Marking
9.1 General requirements
9.2 Markings for the various connections
9.3 Marking of integrated safety devices
Annex A (informative) Alternative methods for the
determination of the accuracy class, the lock-up
pressure class, the maximum accuracy flow rate,
the flow coefficients and the verification of the
hysteresis band
A.1 General
A.2 Test methods
A.2.1 Direct acting gas pressure regulator
A.2.2 Pilot controlled gas pressure regulators
A.3 Determination of flow coefficients for larger
capacity regulators
Annex B (informative) Inspection certificate
Annex C (informative) Acceptance test
Annex D (informative) Compliance evaluation
D.1 General
D.2 Introduction
D.3 Procedure
D.4 Manufacturer's compliance evaluation
D.5 Issue of the certificate of compliance
Annex E (informative) Seat leakage (alternative requirement)
Annex F (normative) Creep (venting) relief device
F.1 General
F.2 Terms and definitions
F.3 Requirements
F.3.1 Construction
F.3.2 Functional requirements
F.4 Testing
F.5 Type test
F.6 Routine tests
F.7 Documentation
F.8 Marking
Annex G (informative) Order specification
G.1 General
G.2 Minimum specifications
G.2.1 Details of construction
G.2.2 Dimensions
G.2.3 Performance
G.3 Optional specifications
Annex H (normative) Materials
H.1 Steel materials for pressure containing parts and
inner metallic partition walls
H.2 Metallic materials different from steel materials
for pressure containing parts and inner metallic
partition walls
H.3 Materials for fixtures, integral process and
sensing lines, connectors and fasteners
Annex I (informative) Glossary
Annex ZA (informative) Relationship between this European
Standard and the Essential Requirements of EU
Directive 97/23/EC
Bibliography
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