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BS EN 1804-2:2020:2021 Edition

BS EN 1804-2:2020:2021 Edition

$189.07

Machines for underground mines. Safety requirements for hydraulic powered roof supports – Power set legs and rams

Published By Publication Date Number of Pages
BSI 2021 46
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This document stipulates the safety requirements for use of legs and rams as intended by the manufacturer. These include legs, support rams and rams, including the mechanical extensions, the inner valves and safety devices, seals, the hydraulic connections (up to the 1st hose line or to the valve of design B, see EN 1804-3:2020) and their lifting points, but excluding protective pipes and gaiters, external valves and hydraulic and electrohydraulic control systems. NOTE Some components are discussed in other parts of this standard series. This document applies for legs, support rams, and cylinders that are used at ambient temperatures between -10 °C and 60 °C. This document identifies and takes account of: – possible hazards which may be caused by the operation of legs, support rams and rams; – the hazardous areas and the operating conditions that can cause any type of hazard; – the situations that can result in hazards that cause an injury or impair health; – dangers that can be caused through mine gas and/or flammable dusts. This document describes methods for reducing these hazards. Clause 4 contains a list of the hazards discussed. This document does not specify any additional requirements for: – specially corrosive environments; – risks associated with manufacturing and decommissioning; – earthquake. A complete hydraulic powered roof support consists of the support units (EN 1804-1:2020), legs and support rams (EN 1804-2:2020) and the hydraulic and electro hydraulic controls (EN 1804-3:2020). Each part of this multipart document addresses the safety requirements of the components mentioned in the scopes of the respective parts of this multipart series. This document is not applicable to legs and rams manufactured before the date of its publication.

PDF Catalog

PDF Pages PDF Title
2 undefined
8 1 Scope
2 Normative references
9 3 Terms and definitions
11 4 Safety requirements
4.1 General
4.2 Lifting points
4.3 Internal valves and safety devices
12 4.4 Pressurized fluids
4.5 Protection against ejecting fluids
4.6 Yield capability
4.7 Behaviour under axial overload
4.8 Eccentric loading
4.9 Functional reliability
4.10 Leak tightness
13 4.11 Extension limit
4.12 Force introduction points of actuators
4.13 Materials
4.13.1 Steel
4.13.1.1 General
4.13.1.2 Steel for welded actuator components
4.13.1.3 Steel for non-welded actuator components
4.13.2 Light metal
4.13.3 Materials other than steel
14 4.13.4 Seals
4.14 Calculated permissible stresses
4.14.1 Permissible stresses under axial central rated force conditions
4.14.2 Permissible stresses under double axial central rated force conditions
4.14.3 Permissible stresses under eccentric rated force conditions
4.14.4 Permissible weld stresses
4.15 Welding
15 5 Verification of the safety requirements
5.1 Type testing
16 5.2 Series verification
6 User information
6.1 General requirements
6.2 Technical and application data
6.2.1 Introduction
6.2.2 General description
6.2.3 Performance data
6.2.4 Hydraulic data
6.2.5 List of additional drawings and documents
6.3 Handling, transport and storage
6.3.1 Introduction
17 6.3.2 Handling and transport
6.3.3 Storage
6.4 Installation, commissioning, and operation
6.4.1 Installation
6.4.2 Commissioning
6.4.3 Operation
18 6.5 Maintenance
6.5.1 Introduction
6.5.2 Maintenance instructions
6.5.3 Fault diagnosis and correction
6.5.4 Preventative maintenance schedules
6.5.5 Technical description
6.6 Parts identification lists
19 6.7 Marking / Identification
6.8 Residual risk
20 Annex A (normative)Tests for verification of the safety requirements
A.1 Load tests
A.1.1 General
A.1.2 Testing with a central axial load
A.1.2.1 Testing the extension limit
A.1.2.2 Yield test
21 A.1.2.3 Overload tests
A.1.2.4 Leakage test
22 A.1.3 Testing with eccentric force
A.1.3.1 General
A.1.3.2 Bending test
A.1.3.3 Yield test
A.1.4 Life test
A.1.4.1 General
23 A.1.4.2 Application of eccentric load
A.1.4.3 Application of central axial load
A.1.4.4 Application of pressure in the fully extended condition
A.1.4.5 Application of tensile load
24 A.1.4.6 Function test
A.1.5 Testing of lifting points
25 A.2 Static calculation of actuators
A.2.1 General
A.2.2 Axial stresses
A.2.2.1 Actuator under central axial rated force
26 A.2.2.2 Actuator under double central rated force
A.2.2.3 Actuator under eccentric rated force
27 A.2.2.4 Actuator with additional lateral force
28 A.2.2.5 Superimposition of the axial stresses
29 A.2.3 Tangential stresses
A.2.4 Radial stresses
A.2.5 Combined stresses
30 A.2.6 Individual components
A.2.6.1 Connecting parts inside leg
A.2.6.2 Extension pieces
31 A.2.7 Symbols and units
A.3 Testing the material properties
A.3.1 General
A.3.2 Weldability
32 A.3.3 Mechanical properties
A.3.4 Impact value
33 Annex B (informative)List of tests
39 Annex C (informative)List of significant hazards
42 Annex ZA (informative)Relationship between this European Standard and the essential requirements of Directive 2006/42/EC aimed to be covered

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