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BS EN 334:2019 Gas pressure regulators for inlet pressure up to 10 MPa (100 bar), 2019
- National foreword
- 1 Scope
- 2 Normative references
- 3 Terms and definitions [Go to Page]
- 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 related to functional performance [Go to Page]
- 3.3.1 Terms, symbols and definitions related to pressure
- 3.3.2 Terms, symbols and definitions related to flow
- 3.3.3 Sound emission
- 3.3.4 Variables in the controlling process
- 3.3.5 Terms and definitions related to possible values of all variables
- 3.3.6 Terms, symbols and definitions related to the controlled process
- 3.3.7 Terms, symbols and definitions of functional performance
- 3.3.8 Feature related to accuracy
- 3.3.9 Terms, symbols and definitions related to lock-up behaviour
- 3.4 Terms, symbols and definitions related to design and tests
- 3.5 Summary of symbols, terms, subclauses and units
- 4 Construction requirements [Go to Page]
- 4.1 Basic requirements [Go to Page]
- 4.1.1 General
- 4.1.2 Gas pressure regulators with associated safety devices [Go to Page]
- 4.1.2.1 Gas pressure regulators with integrated safety devices
- 4.1.2.2 Gas pressure regulators with in-line monitor
- 4.1.2.3 Gas pressure regulator with in-line safety shut off device
- 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 Parts transmitting actuating forces
- 4.1.9 Replaceable parts that may be affected by erosion or abrasion
- 4.2 Materials [Go to Page]
- 4.2.1 Requirements for metallic materials [Go to Page]
- 4.2.1.1 Pressure bearing parts and inner metallic partition walls
- 4.2.1.2 Auxiliary devices, integral process and sensing lines, connectors, threaded sealing plug and fasteners
- 4.2.1.3 Other parts
- 4.2.1.4 Material inspection documents of pressure bearing parts and inner metallic partition walls
- 4.2.1.5 Material inspection documents of fasteners and connectors
- 4.2.1.6 Manufacturing requirements
- 4.2.1.7 Non-destructive testing (NDT)
- 4.2.2 Requirements for elastomeric materials (vulcanized rubber materials)
- 4.2.3 Requirements for non-metallic materials different from those in 4.2.2
- 4.3 Strength of housings and other parts [Go to Page]
- 4.3.1 Body
- 4.3.2 Flanges
- 4.3.3 Other pressure bearing parts
- 4.3.4 Integral strength pressure regulators)
- 4.3.5 Differential strength pressure regulators)
- 4.3.6 Inner metallic partition walls
- 4.3.7 Minimum values of safety factor for pressure bearing parts
- 4.3.8 Welded joint coefficient
- 4.3.9 Design requirements for strength of elastomeric parts
- 5 Functional and characteristic requirements [Go to Page]
- 5.1 General [Go to Page]
- 5.1.1 Mounting position
- 5.2 Shell strength, external tightness and internal sealing [Go to Page]
- 5.2.1 Shell strength
- 5.2.2 External tightness
- 5.2.3 Internal sealing
- 5.3 Control classifications [Go to Page]
- 5.3.1 Accuracy under stable conditions [Go to Page]
- 5.3.1.1 Accuracy classes
- 5.3.1.2 Hysteresis
- 5.3.2 Lock-up behaviour [Go to Page]
- 5.3.2.1 Lock-up pressure classes
- 5.3.2.2 Classes of lock-up pressure zone
- 5.3.3 Stable conditions
- 5.4 Final visual inspection [Go to Page]
- 5.4.1 Requirements for final visual inspection after type tests
- 5.4.2 Requirements for final visual inspection after routine tests and production surveillance
- 5.5 Fail close conditions
- 5.6 Fail open conditions
- 5.7 Closing force for monitor at full open position
- 5.8 Antistatic characteristics
- 6 Gas pressure regulator sizing [Go to Page]
- 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 [Go to Page]
- 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 [Go to Page]
- 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 [Go to Page]
- 7.7.1 Dimensional check and visual inspection
- 7.7.2 Materials check
- 7.7.3 Verification of the strength of pressure bearing parts, inner metallic partition walls and other parts) [Go to Page]
- 7.7.3.1 Strength calculation method for metallic parts
- 7.7.3.2 Verification of experimental design method for metallic parts
- 7.7.3.3 Verification of the strength of parts transmitting actuating forces
- 7.7.3.4 Verification of strength of diaphragm used as pressure containing parts
- 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 Verification of closing force for monitor in fully open position under normal operating conditions
- 7.7.7 External tightness test [Go to Page]
- 7.7.7.1 External tightness test of metallic housing
- 7.7.7.2 External tightness test of chambers bounded on at least one side by a diaphragm
- 7.7.8 Test method and acceptance criteria to verify the antistatic characteristics
- 7.7.9 Functional tests [Go to Page]
- 7.7.9.1 General conditions
- 7.7.9.2 Determination of the flow coefficients
- 7.7.9.3 Check of internal sealing and lock-up pressure class
- 7.7.9.4 Functional tests under stable conditions
- 7.7.9.5 Method to prove the compliance with requirements detailed in subclauses 5.5 or 5.6
- 7.7.10 Final visual inspections [Go to Page]
- 7.7.10.1 Final visual inspection after type test
- 7.7.10.2 Final visual inspection after routine tests and production surveillance
- 8 Field surveillance
- 9 Documentation [Go to Page]
- 9.1 Documentation related to type test [Go to Page]
- 9.1.1 Documentation required prior to type test
- 9.1.2 Test report
- 9.2 Documentation related to the routine tests
- 9.3 Documentation related to production surveillance in accordance with 7.6 [Go to Page]
- 9.3.1 Documentation for production surveillance
- 9.3.2 Production surveillance report
- 9.4 Operating instructions
- 10 Marking [Go to Page]
- 10.1 General requirements
- 10.2 Basic requirements
- 10.3 Other additional requirements
- 10.4 Marking of integrated safety devices
- 10.5 Markings for the various connections
- 11 Packaging of finished product
- 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 [Go to Page]
- A.1 General
- A.2 Test methods [Go to Page]
- 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 ) [Go to Page]
- 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 (normative)Creep (venting) relief device [Go to Page]
- E.1 General
- E.2 Terms and definitions
- E.3 Requirements [Go to Page]
- E.3.1 Construction
- E.3.2 Functional requirements
- E.4 Testing
- E.5 Type test
- E.6 Routine tests
- E.7 Documentation
- E.8 Marking
- Annex F (informative)Order specification [Go to Page]
- F.1 General
- F.2 Minimum specifications [Go to Page]
- F.2.1 Details of construction
- F.2.2 Dimensions
- F.2.3 Performance
- F.3 Optional specifications
- Annex G (informative)Materials [Go to Page]
- G.1 Steel materials for pressure bearing parts and inner metallic partition walls
- G.2 Metallic materials different from steel materials for pressure bearing parts and inner metallic partition walls
- G.3 Materials for auxiliary devices, integral process and sensing lines, threaded sealing plug, connectors and fasteners
- G.4 Update to year 2017 on Metallic Material Standards used in the previous editions of this standard
- Annex H (informative)Dynamic force calculation method [Go to Page]
- H.1 General
- H.2 Test method for the determination of the dynamic factor Cr [Go to Page]
- H.2.1 General
- H.2.2 Test method for the determination of the dynamic factor Cr for a series of monitor
- Annex I (normative)Vent limiter [Go to Page]
- I.1 General
- I.2 Scope
- I.3 Terms, symbols and definitions
- I.4 Requirements [Go to Page]
- I.4.1 General requirements
- I.4.2 Materials
- I.4.3 Strength
- I.4.4 Functional requirements
- I.5 Testing and acceptance criteria [Go to Page]
- I.5.1 General
- I.5.2 Type test method
- I.6 Documentation
- I.7 Specific marking on vent limiter
- Annex J (normative)Elastomeric material
- Annex K (informative)Sound emission [Go to Page]
- K.1 Sound emission requirements
- K.2 Methods for measuring the sound pressure level
- Annex L (informative)Environmental Provisions
- Annex M (informative)Glossary
- Annex ZA (informative)Relationship between this European Standard and the essential requirements of Directive 2014/68/EU aimed to be covered [Go to Page]
