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eLibrary > BS ISO 23555-3:2024 Gas pressure safety and control devices for use in gas transmission, distribution and installations for inlet pressures up to and including 10 MPa - Safety shut-off devices >

BS ISO 23555-3:2024 Gas pressure safety and control devices for use in gas transmission, distribution and installations for inlet pressures up to and including 10 MPa - Safety shut-off devices, 2024

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Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions and symbols [Go to Page]
3.1 Terms and definitions [Go to Page]
3.1.1 Terms related to safety shut-off devices in general
3.1.2 Terms related to components of safety shut-off devices
3.1.3 Terms related to variables in the controlling process
3.1.4 Terms related to the controlled process and to the set value of the trip pressure
3.1.5 Terms related to functional performances
3.1.6 Terms related to the design and tests
3.2 Symbols, abbreviated terms 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-containing metallic 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 (Functional class A)
6.5.3 Diaphragms of gas safety shut-off devices (Functional class B)
6.6 Welding
6.7 Main function of a safety shut-off device [Go to Page]
6.7.1 General
6.7.2 Basic requirements for SSDs
6.7.3 Stand-alone gas safety shut-off devices
6.7.4 Safety shut-off devices integrated into a gas pressure regulator
6.7.5 Safety shut-off devices with an in-line gas pressure regulator
6.7.6 Safety shut-off device plus a second safety shut-off device.
6.7.7 Set range
6.7.8 External visual indication of the position of the closing member
6.7.9 Shutting-off and opening
6.7.10 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 ageing
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 (informative) Inspection certificate
Annex F (informative) Ice formation
Annex G (informative) Pressure drop
Annex H (informative) Alternative test method for verification of the strength of the trip mechanism, valve seat and closing member
Annex I (informative) Sizing equation
Annex J (informative) Order specification
Annex K (informative) Acceptance test
Annex L (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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