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BSI 23/30446964 DC 2023

BSI 23/30446964 DC 2023

$13.70

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

Published By Publication Date Number of Pages
BSI 2023 62
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PDF Catalog

PDF Pages PDF Title
8 Foreword
9 Introduction
11 1 Scope
12 2 Normative references
3 Terms and definitions
3.1 General terms and definition of safety shut-off devices
13 3.2 Terms and definition of components of safety shut-off devices
17 3.3 Variables in the controlling process
18 3.4 Terms, symbols and definitions related to the controlled process and to the set value of the trip pressure
19 3.5 Terms, symbols and definitions related to functional performances
20 3.6 Terms, symbols and definitions related to the design and tests
3.7 Summary of symbols, terms, subclauses and units
21 4 Classification
4.1 General
4.2 Temperature classes
4.3 Strength types
22 4.4 Fail conditions
5 Materials
6 Design
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)
6.5.1 General
6.5.2 Diaphragms of gas safety shut off devices class A
23 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
6.7.1 Basic requirements for SSDs
24 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
25 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
7.1 General
7.1.1 Approach to stable product phase
26 7.1.2 Test conditions
7.1.3 Test tolerances
7.1.4 Overview table
27 7.2 Requirements
7.2.1 Test rig
29 7.2.2 Classification of tests
30 7.2.3 Dimensional check and visual inspection
7.2.4 Shell strength
7.2.5 External/Internal tightness
31 7.2.6 Antistatic characteristics
7.2.7 Sound emission
7.2.8 Resistance of external surfaces to corrosion
7.2.9 Failure modes
32 7.2.10 Safety shut-off sizing
7.2.11 Accuracy group
7.2.12 Response time
7.2.13 Relatching difference and unlatching
33 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
34 7.2.18 SSDS with incorporated vent limiters
7.2.19 Ice formation
7.3 Tests
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
35 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
37 7.3.10 Determination of flow coefficients
38 7.3.11 Response time
39 7.3.12 Relatching difference and unlatching
40 7.3.13 Verification of closing force
41 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
42 8 Documentation
8.1 General
43 8.2 Documentation related to type test
8.3 Documentation related to batch surveillance
8.4 Documentation related to the routine tests
8.4.1 Documentation provided at the request of the customer
8.4.2 Documentation provided with the safety shut-off device
9 Marking
9.1 General
9.2 Basic requirements
44 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
45 Annex€A (informative) List of Material
46 Annex€B (normative) Elastomeric material
47 Annex€C (normative) Vent limiter
48 Annex€D (normative) Compliance Evaluation
49 Annex€E (normative) Specific Regional Requirement in Japan
50 Annex€F (informative) Inspection Certificate
52 Annex€G (informative) Ice formation
53 Annex€H (informative) Pressure drop
54 Annex€I (normative) Alternative test method for verification of the strength of the trip mechanism, valve seat and closing member
57 Annex€J (informative) Sizing equation
58 Annex€K (informative) Order specification
60 Annex€L (informative) Acceptance test
61 Annex€M (informative) Suitability of safety shut-off device for damp operating conditions – Test procedure, requirement and acceptance criteria
62 Bibliography

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