SIST EN 1804-2:2002

SLOVENSKI STANDARD
01-junij-2002
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Machines for underground mines - Safety requirements for hydraulic powered roof
supports - Part 2: Power set legs and rams
Maschinen für den Bergbau unter Tage - Sicherheitsanforderungen für hydraulischen
Schreitausbau - Teil 2: Stempel und Zylinder
Machines pour mines souterraines - Exigences de sécurité relatives aux soutenements
marchants applicables aux piles - Partie 2: Etançons et vérins a pose mécanisée
Ta slovenski standard je istoveten z: EN 1804-2:2001
ICS:
73.100.10 Oprema za gradnjo predorov Tunnelling and tubbing
in podzemnih železnic equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 1804-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2001
ICS 73.100.10
English version
Machines for underground mines - Safety requirements for
hydraulic powered roof supports - Part 2: Power set legs and
rams
Machines pour mines souterraines - Exigences de sécurité Maschinen für den Bergbau unter Tage -
relatives aux soutènements marchants applicables aux Sicherheitsanforderungen für hydraulischen Schreitausbau
piles - Partie 2: Etançons et vérins à pose mécanisée - Teil 2: Stempel und Zylinder
This European Standard was approved by CEN on 21 September 2001.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2001 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1804-2:2001 E
worldwide for CEN national Members.

Contents
page
Foreword. 3
0 Introduction. 4
1 Scope . 4
2 Normative references . 5
3 Terms and definitions . 6
4 List of hazards . 7
5 Safety requirements . 8
6 Verification of the safety requirements. 11
7 User information . 12
Annex A (normative) Tests for verification of the safety requirements. 16
Annex B (normative) List of tests. 27
Annex ZA (informative) Relationship of this document with EC Directives . 33
Bibliography. 34
Foreword
This European Standard has been prepared by Technical Committee CEN/TC 196 "Machines for
underground mining - Safety", the secretariat of which is held by BSI.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by April 2002, and conflicting national standards shall be
withdrawn at the latest by April 2002.
This European Standard has been prepared under a mandate given to CEN by the European
Commission and the European Free Trade Association, and supports essential requirements of EC
Directive(s).
For relationship with EC Directive(s), see informative Annex ZA, which is an integral part of this standard.
This standard is Part 1 of a European Standard specifying the safety requirements for hydraulic powered
roof supports.
Other parts are:
Part 1: Support units and general requirements
Part 3: Hydraulic control systems
Part 4 ): Electro-hydraulic control systems
Annexes A and B are normative.
This standard includes a Bibliography.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic,
Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway,
Portugal, Spain, Sweden, Switzerland and the United Kingdom.

) in preparation
0 Introduction
This European Standard is a Type C-standard as stated in EN 1070
The extent to which hazards are covered is indicated in the scope of the standard.
While producing (or when compiling) this standard it was assumed that:
- only trained and competent persons operate the machine;
- components without specific requirements are:
a) designed in accordance with the usual engineering practice and calculation codes;
b) of sound mechanical construction;
c) free of defects.
- components are kept in good working order;
- negotiations have taken place between the user and the manufacturer of the legs and rams
(manufacturer of the roof support unit or final user in case of replacement parts) concerning the use
of the machinery.
1 Scope
This standard specifies the safety requirements for legs and rams when used as specified by the
manufacturer or his authorised representative. Examples covered by the standard include legs, support
rams and rams with their mechanical extensions, internal valves and safety devices, seals, hydraulic
connections (up to the first hose or Type B valve, see Part 3) and their lifting points but excluding
protective pipes and gaiters, external valves and hydraulic and electrohydraulic control systems.
NOTE Some components are dealt with in other parts of this standard.
This standard applies to legs, support rams and rams used at ambient temperatures from –10 °C to 60
°C.
This standard identifies and takes account of:
- Possible hazards which may be caused by the operation of legs, support rams and rams;
- Areas and operating conditions which may create such hazards;
- Hazardous situations which may cause injury or may be damaging to health.
This standard describes methods for the reduction of these hazards.
A list of hazards covered appears in clause 4.
This standard is applicable to all legs, support rams and rams placed on the market for the first time and
which are manufactured after the date on which this standard was published.
This European standard does not establish the additional requirements for:
- Specially corrosive environments;
- Hazards occurring during construction, transportation, decommissioning;
- Earthquake.
2 Normative references
This European Standard incorporates by dated or undated reference, provisions from other publications.
These normative references are cited at the appropriate places in the text, and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications
apply to this European Standard only when incorporated in it by amendment or revision. For undated
references the latest edition of the publication referred to applies (including amendments).
EN 287-1 Approval testing of welders - Fusion welding - Part 1: Steels.
EN 288-1 Specification and approval of welding procedures for metallic materials - Part 1:
General rules for fusion welding.
EN 288-2 Specification and approval of welding procedures for metallic materials - Part 2:
Welding procedure specification for arc welding
.
EN 288-3 Specification and approval of welding procedures for metallic materials - Part 3:
Welding procedure tests for the arc welding of steels.
EN 292-2:1991 + A1:1995
Safety of machinery - Basic concepts, general principles for design - Part 2: Technical
principles and specifications.
EN 1050:1996 Safety of machinery – Principles for risk assessment.
EN 1804-1:2001 Machines for underground mines - Safety requirements for hydraulic powered roof
supports - Part 1: Support units and general requirements.
prEN 1804-3 Machines for underground mines - Safety requirements for hydraulic powered roof
supports – Part 3: Hydraulic control systems.
EN 10002-1 Metallic materials - Tensile testing - Part 1: Method of test.
EN 10045-1 Metallic materials - Charpy impact test - Part 1: Test method.
prEN 13463-1:1999Non-electrical equipment for potentially explosive atmospheres- Part 1: Basic
methodology and requirements.
ISO 7745:1989 Hydraulic fluid power - Fire-resistant (FR) fluids - Guidelines for use.
EURONORM 103:1971
Microscopic determination of the ferrite or austenitic grain size of steels.
3 Terms and definitions
For the purposes of this standard the following terms and definitions apply.
3.1
support unit
type of hydraulic powered roof support e.g. frame support, chock support, shield support, consisting of
support components and support accessories [EN 1804-1:2001]
3.2
support components
all components which lie within the flow of the support bearing force
3.2.1
actuator
any type of hydraulic linear reciprocating device referred to in this standard
3.2.2
legs and support rams
hydraulic actuators for producing the support bearing force of the support unit
3.2.3
single telescopic legs and support rams
hydraulic legs and support rams with one extension stage
3.2.4
multi telescopic legs and support rams
hydraulic legs and support rams with several extension stages
3.3 rams
all actuators which do not lie within the flow of the support bearing force but which are necessary for the
functioning of the powered roof support
3.4
valve
device for controlling the hydraulic functions
3.5
pressures
3.5.1
setting pressure
hydraulic pressure in the legs and support rams on completion of the setting procedure. This pressure is
supplied by the hydraulic system
3.5.2
yield pressure of an actuator
hydraulic pressure in an actuator when the relevant pressure limiting valve is opened. This pressure in
the actuator is induced by external forces (yield forces; see 3.5.2 of EN 1804-1:2001)
3.5.3
maximum permissible working pressure of an actuator
maximum hydraulic pressure at which a hydraulic component is intended be operated and/or yielded
3.6
rated actuator force
maximum force to which an actuator is designed. It is a calculated value which is determined from the
actuator geometry and the maximum permissible working pressure, neglecting friction
3.7
functions
3.7.1
extension
pushing out of the actuator operating piston by means of hydraulic pressure
3.7.2
retraction
drawing in of the actuator operating piston by means of hydraulic pressure
3.7.3
setting
extending of the support unit between the roof and the floor by pressuring the legs and support rams
3.7.4
yielding
alteration in length of an actuator which occurs when external forces cause the yield pressure to be
exceeded
4 List of hazards
All the items in the following list of hazards refer to continuous operation and to installation and
maintenance.
This list contains the hazards and hazardous situations, as far as they are dealt with in this European
Standard, identified by risk assessment as being significant for this type of machinery and which require
action to eliminate or reduce risk.
Table 1 - List of hazards with cross references to safety requirements
No. EN 1050:1996 Safety requirements (clause) Hazards
1 1.1; 1.2; 1.3 5.8 Crushing, shearing and cutting
2 1.9 5.2; 5.4 High pressure fluid jets
3 17 5.2; 5.6; 5.7; 5.8 Ejected parts
4 1e; 1.8 5.2; 5.5; 5.6; 5.7; 5.8; 5.10 to 5.13 Fatigue, overload; friction or wear
5 2.4 5.12.3 Electrical energy resulting from
electrostatic phenomena
6 7.1 5.9 Inhalation of harmful fluids, mists and
fumes
7 7.2 5.3; 5.12.2 Fire or explosion
8 17 5.4 to 5.14 Unexpected ejection of machine parts
or fluids
9 5.15 Errors of fitting
10 27.8 5.1; 5.15 Absence or incorrect installation of
devices and accessories for assembly
and maintenance
11 10.6 5.1; 5.15 operating error
12 1.C 5.1; 5.15. Potential energy of actuators parts
which may move under the effect of
gravity
5 Safety requirements
5.1 Lifting points
Where lifting points are fitted to actuators they shall be suitable for their intended purpose. They shall be
designed to have a calculated minimum factor of safety of 4 on ultimate breaking load in relation to their
intended load carrying capacity. They shall be clearly and permanently marked with their load carrying
capacity e.g. by welding.
5.2 Internal valves and safety devices
Actuators, that can be externally overloaded, shall be protected against excessive pressure.
This can be by means of
internal valves
external valves (see prEN 1804-3)
safety devices such as bursting blanks.
The pressure in the piston compartment of hydraulic le
...