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AS 4118.1.2-1996
[Current]Fire sprinkler systems, Part 1.2: Components — Alarm valves (wet)
Specifies the requirements for the construction and performance of alarm valves (wet), for use in fire sprinkler systems.
Published: 05/01/1996
Pages: 14
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
PREFACE
1 SCOPE AND GENERAL
1.1 SCOPE
1.2 NEW DESIGNS AND INNOVATIONS
1.3 DEEMED TO SATISFY
1.4 REFERENCED DOCUMENTS
1.5 DEFINITIONS
2 REQUIREMENTS
2.1 NOMINAL SIZE
2.2 CONNECTIONS
2.3 RATED WORKING PRESSURES
2.4 BODIES AND COVERS
2.4.1 Non-metallic components
2.4.2 Corrosion resistance
2.4.3 Assembly
2.5 STRENGTH
2.5.1 Hydrostatic pressure
2.5.2 Fasteners
2.6 DRAIN
2.7 ACCESS FOR MAINTENANCE
2.8 COMPONENTS
2.8.1 Design
2.8.2 Sealing assembly
2.8.3 Springs and diaphragms
2.8.4 Sealing elements
2.8.5 Clapper assembly
2.8.6 Seat rings, bearings and bushings
2.9 NON-METALLIC COMPONENTS (Excluding gaskets and seals)
2.9.1 Operational performance and leakage
2.9.2 Operation
2.10 SEALING ASSEMBLY ELEMENTS
2.10.1 Leakage
2.10.2 Adherence
2.10.3 Tensile strength and elongation
2.11 CLEARANCES
2.11.1 Radial clearance
2.11.2 Diametrical clearance
2.11.3 Sealing assembly
2.11.4 Pins and bearings
2.11.5 Axial clearance
2.11.6 Guides
2.11.7 Guide bushings
2.12 OPERATIONAL PERFORMANCE
2.12.1 Hydrostatic pressure withstand
2.12.2 Alarm status at low flow
2.12.3 Alarm status at high flow
2.12.4 Operational pressure range
2.12.5 Pressure ratio
2.12.6 Alarm operation
2.12.7 Repeat alarms
2.12.8 Alarm port pressure
2.12.9 Drain
2.13 HYDRAULIC FRICTION LOSS
2.14 LEAKAGE
2.14.1 Downstream hydrostatic pressure
2.14.2 Internal hydrostatic pressure (long term)
2.14.3 Internal hydrostatic pressure (short term)
2.15 ENDURANCE TEST
3 TEST METHODS
3.1 SPRING AND DIAPHRAGM TEST (see Clause 2.8.3)
3.2 AIR-OVEN AGEING FOR NON-METALLIC COMPONENTS (excluding gaskets and seals) (see Clause 2.9)
3.3 WARM WATER AGEING FOR NON-METALLIC COMPONENTS (excluding gaskets and seals) (see Clause 2.9)
3.4 SEALING ELEMENT TEST
3.4.1 Release test (see Clause 2.10.2)
3.4.2 Non-reinforced elastomeric sealing element test (see Clause 2.10.3)
3.5 HYDRAULIC FRICTION LOSS TEST AND ENDURANCE TEST
3.5.1 Hydraulic friction loss test (see Clause 2.13)
3.5.2 Endurance test (see Clause 2.15)
3.6 VALVE LEAKAGE AND DEFORMATION TEST
3.6.1 Internal hydrostatic test (short term) (see Clauses 2.12.1 and 2.14.1)
3.6.2 Internal hydrostatic test (long term) (see Clause 2.14.2)
3.6.3 Internal hydrostatic test (high pressure/short term) (see Clause 2.14.3)
3.7 BODY STRENGTH TEST (see Clause 2.5.1)
3.8 OPERATIONAL TESTS
3.8.1 General
3.8.2 Ratio test (see Clause 2.12.5)
3.8.3 Alarm and sensitivity test (see Clauses 2.10.1, 2.12.2, 2.12.3, 2.12.4, 2.12.6, 2.12.7 and 2.12.8)
3.9 FIRE EXPOSURE TEST (see Clause 2.4.1)
4 MARKING
5 INSTRUCTION CHARTS
Cited references in this standard
ISO 898.2
Mechanical properties of fasteners, Part 2: Nuts with specified proof load values
ISO 898.1
Mechanical properties of fasteners, Part 1: Bolts, screws and studs
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