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eLibrary > 23/30446964 DC BS EN ISO 23555-3. Gas pressure safety and control devices for use in gas transmission, distribution and installations for inlet pressures up to and including 10 MPa - Part 3. Safety shut-off devices >

23/30446964 DC BS EN ISO 23555-3. Gas pressure safety and control devices for use in gas transmission, distribution and installations for inlet pressures up to and including 10 MPa - Part 3. Safety shut-off devices, 2023

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23/30446964 DC BS EN ISO 23555-3. Gas pressure safety and control devices for use in gas transmission, distribution and installations for inlet pressures up to and including 10 MPa - Part 3. Safety shut-off devices, 2023

ISO_DIS 23555-3 ed.1 - id.83517 Enquiry PDF (en).pdf [Go to Page]
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions [Go to Page]
3.1 General terms and definition of safety shut-off devices
3.2 Terms and definition of components of safety shut-off devices
3.3 Variables in the controlling process
3.4 Terms, symbols and definitions related to the controlled process and to the set value of the trip pressure
3.5 Terms, symbols and definitions related to functional performances
3.6 Terms, symbols and definitions related to the design and tests
3.7 Summary of symbols, terms, subclauses and units
4 Classification [Go to Page]
4.1 General
4.2 Temperature classes
4.3 Strength types
4.4 Fail conditions
5 Materials
6 Design [Go to Page]
6.1 General
6.2 Strength of metallic body and its inner metallic partition walls
6.3 Other pressure metallic containing parts of integral and differential strength SSDs
6.4 Strength of parts transmitting actuating forces
6.5 Strength of diaphragms (elastomeric parts) [Go to Page]
6.5.1 General
6.5.2 Diaphragms of gas safety shut off devices class A
6.5.3 Diaphragms of gas safety shut off devices class B
6.6 Welding
6.7 Main function of a safety shut-off device [Go to Page]
6.7.1 Basic requirements for SSDs
6.7.2 Stand-alone gas safety shut-off devices
6.7.3 Safety shut-off devices integrated into a gas pressure regulator
6.7.4 Safety shut-off devices with in-line gas pressure regulator
6.7.5 Safety shut-off device plus a second safety shut-off device.
6.7.6 Set range
6.7.7 External visual indication of the position of the closing member
6.7.8 Shutting-off and opening
6.7.9 By-pass
7 Performance requirements and testing [Go to Page]
7.1 General [Go to Page]
7.1.1 Approach to stable product phase
7.1.2 Test conditions
7.1.3 Test tolerances
7.1.4 Overview table
7.2 Requirements [Go to Page]
7.2.1 Test rig
7.2.2 Classification of tests
7.2.3 Dimensional check and visual inspection
7.2.4 Shell strength
7.2.5 External/Internal tightness
7.2.6 Antistatic characteristics
7.2.7 Sound emission
7.2.8 Resistance of external surfaces to corrosion
7.2.9 Failure modes
7.2.10 Safety shut-off sizing
7.2.11 Accuracy group
7.2.12 Response time
7.2.13 Relatching difference and unlatching
7.2.14 Closing force
7.2.15 Endurance and accelerated ageing
7.2.16 Strength of the trip mechanism, valve seat and closing member against the dynamic impact of flowing gas
7.2.17 Flow coefficient
7.2.18 SSDS with incorporated vent limiters
7.2.19 Ice formation
7.3 Tests [Go to Page]
7.3.1 Materials check at stable production phase
7.3.2 Dimensional check and visual inspection
7.3.3 Mounting position
7.3.4 Shell strength
7.3.5 External tightness test
7.3.6 Internal tightness test
7.3.7 Antistatic characteristics
7.3.8 Methods for calculating and measuring the sound pressure level
7.3.9 Accuracy Group tests
7.3.10 Determination of flow coefficients
7.3.11 Response time
7.3.12 Relatching difference and unlatching
7.3.13 Verification of closing force
7.3.14 Endurance and accelerated ageingw
7.3.15 Method for testing of resistance of external surfaces to corrosion
7.3.16 Resistance to gas of non-metallic parts
7.3.17 Verification of the strength of the trip mechanism, valve seat and closing member against dynamic impact of flowing gas
8 Documentation [Go to Page]
8.1 General
8.2 Documentation related to type test
8.3 Documentation related to batch surveillance
8.4 Documentation related to the routine tests [Go to Page]
8.4.1 Documentation provided at the request of the customer
8.4.2 Documentation provided with the safety shut-off device
9 Marking [Go to Page]
9.1 General
9.2 Basic requirements
9.3 Marking of various connections
9.4 Marking of integrated gas pressure regulators
9.5 Other additional requirements
10 Packaging and transportation of finished product
Annex€A (informative) List of Material
Annex€B (normative) Elastomeric material
Annex€C (normative) Vent limiter
Annex€D (normative) Compliance Evaluation
Annex€E (normative) Specific Regional Requirement in Japan
Annex€F (informative) Inspection Certificate
Annex€G (informative) Ice formation
Annex€H (informative) Pressure drop
Annex€I (normative) Alternative test method for verification of the strength of the trip mechanism, valve seat and closing member
Annex€J (informative) Sizing equation
Annex€K (informative) Order specification
Annex€L (informative) Acceptance test
Annex€M (informative) Suitability of safety shut-off device for damp operating conditions - Test procedure, requirement and acceptance criteria
Bibliography [Go to Page]

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23/30446964 DC BS EN ISO 23555-3. Gas pressure safety and control devices for use in gas transmission, distribution and installations for inlet pressures up to and including 10 MPa - Part 3. Safety shut-off devices, 2023

⨯To continue with accurate pricing,
please select your company type below: