Foundry Machinery - Safety requirements for abrasive blasting equipment

This standard specifies requirements to be met by the manufacturer of abrasive blasting equipment for the foreseeable significant hazards due to design, construction and installation, during commissioning, operation, maintenance and decommissioning of the equipment which employ either centrifugal force or compressed air as a means of accelerating abrasive to achieve the desired result.
Abrasive blasting equipment covers:
- centrifugal blasting machines;
- air blasting machines;
- loading, conveying and unloading systems for the workpieces.
See Annex A for more details.
This standard covers all foreseeable significant hazards which could be encountered during the lifetime of the machine as listed in clause 5.
This standard does not apply to:
- mobile centrifugal blasting equipment;
- mobile air blasting equipment;
- wet blasting equipment;
- the general works compressed air supply system.

Gießereimaschinen - Sicherheitsanforderungen für Strahlanlagen

Diese Norm beschreibt die vom Hersteller von Strahlanlagen zu beachtenden Anforderungen für die vor-hersehbaren
signifikanten Gefährdungen aufgrund Konstruktion, Errichtung und Einbau, bei Inbetrieb-nahme,
Betrieb, Wartung und Außerbetriebnahme der Anlagen, die entweder Zentrifugalkraft oder Druck-luft
als Hilfsmittel zur Beschleunigung des Strahlmittels nutzen, um das gewünschte Ergebnis zu errei-chen.
Strahlanlagen umfassen:
¿ Schleuderstrahlmaschinen;
¿ Druckluftstrahlmaschinen;
¿ Belade-, Transport- und Entladesysteme für die zu strahlenden Teile.
Für weitere Einzelheiten siehe Anhang A.
Diese Norm erfasst alle vorhersehbaren signifikanten Gefährdungen, die im Verlauf der Lebensdauer der
Maschine auftreten können, wie im Abschnitt 5 aufgeführt.
Diese Norm gilt nicht für:
¿ mobile Schleuderstrahlgeräte;
¿ mobile Druckluftstrahlgeräte;
¿ Nass-Strahlgeräte;
¿ das allgemeine Druckluftzufuhrsystem für das Werk.

Machines de fonderie - Prescriptions de sécurité pour équipements de grenaillage

Domaine d'application
La présente norme spécifie les prescriptions, auxquelles le fabricant doit satisfaire, relatives aux phénomènes dangereux significatifs prévisibles dus à la conception, à la construction et à l'installation, à la mise en service, au fonctionnement, à la maintenance et à la mise hors service des équipements qui utilisent la force centrifuge ou l'air comprimé comme moyen d'accélérer la grenaille pour obtenir le résultat désiré.
Les équipements de grenaillage couvrent :
¾ les machines de grenaillage à turbine ;
¾ les machines de grenaillage à air comprimé ;
¾ les systèmes de chargement, d'acheminement et de déchargement pour les pièces à traiter.
Pour plus de détails, voir l'annexe A.
La présente norme couvre tous les phénomènes dangereux significatifs prévisibles qui peuvent être rencontrés pendant la durée de vie de la machine, tels qu'indiqués à l'article 5.
La présente norme ne s'applique pas aux :
équipements mobiles de grenaillage à turbine ;
équipements mobiles de grenaillage à air comprimé ;
procédés de grenaillage humide ;
le système général de production d'air comprimé.

Foundry machinery - Safety requirements for abrasive blasting equipment

General Information

Status
Withdrawn
Publication Date
24-Apr-2001
Withdrawal Date
07-Apr-2009
Technical Committee
Drafting Committee
Current Stage
9960 - Withdrawal effective - Withdrawal
Due Date
08-Apr-2009
Completion Date
08-Apr-2009

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SLOVENSKI STANDARD
SIST EN 1248:2002
01-januar-2002
Foundry machinery - Safety requirements for abrasive blasting equipment
Foundry Machinery - Safety requirements for abrasive blasting equipment
Gießereimaschinen - Sicherheitsanforderungen für
Strahlanlagen
Machines de fonderie - Prescriptions de sécurité pour équipements de grenaillage
Ta slovenski standard je istoveten z: EN 1248:2001
ICS:
25.120.30 Livarska oprema Moulding equipment
SIST EN 1248:2002 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
EUROPEAN STANDARD
EN 1248
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2001
ICS 25.120.30
English version
Foundry Machinery - Safety requirements for abrasive blasting
equipment

Machines de fonderie - Prescriptions de sécurité pour Gießereimaschinen - Sicherheitsanforderungen für

équipements de grenaillage Strahlanlagen
This European Standard was approved by CEN on 8 March 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 1248:2001 E

worldwide for CEN national Members.
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Page 2
EN 1248:2001
Contents
Page
INTRODUCTION 3
1SCOPE 4
2 NORMATIVE REFERENCES 5
3 TERMS AND DEFINITIONS 7
4 HAZARDS 8
5 SAFETY REQUIREMENTS AND/OR MEASURES 9
5.1 General 9
5.2 Centrifugal wheel assembly (see Annex B, figures B.2 and B.3) 10
5.3 Blasting chamber 10
5.4 Abrasive media and contaminants conveying system 16
5.5 Abrasive media and contaminants cleaning, separation and storage device 17
5.6 Power and driving devices 18
5.7 Loading and unloading systems for workpieces 18
5.8 Requirements for control systems 24
5.9 Electrical hazards 24
5.10 Electrostatic phenomena 26
5.11 Noise 26
5.12 Substances 27
5.13 Operator environment - walk in air blast rooms 29
5.14 Operator environment - outside manual operated blasting chamber and hand
blasting chamber 32
6 VERIFICATION OF THE SAFETY REQUIREMENTS AND/OR
MEASURES 34
7 INFORMATION FOR USE 34
7.1 Marking 34
7.2 Technical data and description for safety 34
7.3 Instruction handbook 35
7.4 Maintenance manual 35
8 MAXIMUM CONCENTRATION OF HAZARDOUS SUBSTANCES
IN SHOT BLASTING ABRASIVES 36
ANNEX A (NORMATIVE) Description of equipment covered by this standard 37
ANNEX B (INFORMATIVE) Illustrative solutions for safety measures of
blasting equipment 38
ANNEX ZA (INFORMATIVE) Relationship of this document with EC
Directives 45
BIBLIOGRAPHY 47
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EN 1248:2001
FOREWORD

This European Standard has been prepared by Technical Committee CEN/TC 202 "Foundry

machinery", the secretariat of which is held by DIN.

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 October 2001, and conflicting national

standards shall be withdrawn at the latest by October 2001.

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.

An assessment of the foreseeable risks arising from the use of the equipment was carried out

when this standard was drafted by CEN/TC 202/WG 4, comprising experts from the following

countries: France, Germany, Italy, Sweden and United Kingdom.
Annex A is normative, and Annex B is informative.

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.
INTRODUCTION
This European standard is a type C standard as defined in EN 292.

The equipment and hazards covered by this standard are shown in the scope. In addition,

abrasive blasting machinery shall comply, as appropriate with EN 292-1 and EN 292-2 for

hazards which are not covered by this standard.
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EN 1248:2001
1SCOPE

This standard specifies requirements to be met by the manufacturer of abrasive blasting

equipment for the foreseeable significant hazards due to design, construction and installation,

during commissioning, operation, maintenance and decommissioning of the equipment which

employ either centrifugal force or compressed air as a means of accelerating abrasive to

achieve the desired result.
Abrasive blasting equipment covers:
 centrifugal blasting machines;
 air blasting machines;
 loading, conveying and unloading systems for the workpieces.
See Annex A for more details.

This standard covers all foreseeable significant hazards which could be encountered during

the lifetime of the machine as listed in clause 5.
This standard does not apply to:
 mobile centrifugal blasting equipment;
 mobile air blasting equipment;
 wet blasting equipment;
 the general works compressed air supply system.
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EN 1248:2001
2 NORMATIVE REFERENCES

This Standard incorporates by dated or undated references 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 271 Respiratory protective devices - Compressed air line or powered fresh
air hose breathing apparatus incorporating a hood for use in abrasive
blasting operations
EN 286-1 Simple unfired pressure vessels designed to contain air or nitrogen
Part 1: Design manufacture and testing

EN 292-1:1991 Safety of machinery - Basic concepts, general principles for design

Part 1: Basic terminology, methodology

EN 292-2:1991+ Safety of machinery - Basic concepts, general principles for design -

A1:1995 Part 2: Technical principles and specifications
EN 294 Safety of machinery - Safety distances to prevent danger zones being
reached by the upper limbs
EN 349 Safety of machinery - Minimum distances to avoid crushing of parts
of the human body
EN 418:1992 Safety of machinery - Emergency stop equipment, functional aspects;
Principles for design
EN 626-1 Safety of machinery – Reduction of risks to health from hazardous
substances emitted by machinery
Part 1: Principles and specifications for machinery manufacturers

EN 775+AC:1993 Manipulating Industrial robots – safety (ISO 10218:1992, modified)

EN 953 Safety of machinery – General requirements for the design and
construction of guards (fixed, moveable)
EN 954-1:1996 Safety of machinery - Safety related parts of control systems
Part 1: General principles for design
EN 982 Safety of machinery - Safety requirements for fluid power systems and
their components - hydraulics
EN 999 Safety of machinery – The positioning of protective equipment in
respect of approach speeds of parts of the human body
---------------------- Page: 6 ----------------------
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EN 1248:2001
EN 1037 Safety of machinery - Prevention of unexpected start-up
EN 1070 Safety of machinery - Terminology
EN 1088:1995 Safety of machinery - Interlocking devices associated with guards –
Principles for design and selection
EN 1265 Noise test code for foundry machines and equipment
EN 60204-1:1997 Safety of machinery - Electrical equipment of machines -
Part 1: General requirements.
(IEC 60204-1:1997)
EN 60529 Degrees of protection provided by enclosures (IP-Code);
(IEC 60529:1989)
prEN 620:1992 Continuous handling equipment and systems – Fixed belt conveyors
for bulk material – Special safety requirements for design,
manufacturing, erection and commissioning stages
prEN 1005-3:1993 Safety of machinery - Human physical performance
Part 3: Recommended force limits for machinery operation

EN ISO 11124-1 Preparation of steel substrates before application of paints and related

products - Specifications for metallic blast-cleaning abrasives - Part 1:
General introduction and classification
(ISO 11124-1:1993)

EN ISO 11126-1 Preparation of steel substrates before application of paints and related

products - Specifications for non-metallic blast-cleaning abrasives -
Part 1: General introduction and classification
(ISO 11126-1:1993, including Technical Corrigenda 1:1997 and
2:1997)
EN ISO 11688-1 Acoustics - Recommended practice for the design of low-noise
machinery and equipment
Part 1: Planning
(ISO/TR 11688-1:1995)
CENELEC R044-001, Safety of machinery – Guidance and recommendations for the
February 1999 avoidance of hazards due to static electricity
---------------------- Page: 7 ----------------------
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EN 1248:2001
3 TERMS AND DEFINITIONS

For the purposes of this standard, the terms and definitions given in EN 1070 apply.

Other terms and definitions are as follows:
3.1
blasting

process where workpiece to be cleaned or surface to be treated is subjected to continuous

attack by abrasive blasting media to achieve the desired result
3.2
blasting equipment

machines employing either centrifugal force or compressed air as a means of accelerating

abrasive.

The equipment comprises a chamber which contains the workpiece and also prevents the

abrasive media from escaping to the environment after impacting on the workpiece.

It also incorporates: a system for collecting, recycling, cleaning by air or magnetic separation

or a combination of both and storage for the abrasive media ready to feed back to the dosing

device for abrasive media (for examples of blasting equipment types see Annex A, for an

example of a processing scheme see Annex B, Figure B.1) and a conveying system for

workpieces.
3.3
abrasive media

granular metallic or non-metallic material to be forcibly applied to a surface to achieve the

desired result

Classification of metallic abrasives see EN ISO 11124-1, of non-metallic abrasives see

EN ISO 11126-1.
3.4
free-jet work

a manual blasting process carried out with hand held nozzles where protective separation

between the operator and the rebounding abrasive media and generated dust. The operator

shall wear an abrasive blasting helmet and other protective clothing.
3.5
exhaust system

extraction device which collects contaminated air under a slight negative pressure and

transports it via appropriate ducting to a dust collector
3.6
dust separator

air cleaning device to remove contaminated particulates prior to discharge to the atmosphere

3.7
explosion relief panel
device to release pressure safely and rapidly
---------------------- Page: 8 ----------------------
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EN 1248:2001
3.8
transfer car

vehicle used for transporting the workpieces into and out of the blasting chamber

NOTE The vehicle is often on rails.
3.9
machine setting

control of the actuation of a mechanism during setting phases when the machine is manually

controlled; guards having been by-passed
3.10
manual operation
any sequence or event which is manually controlled by the operator
3.11
automatic operation

every cycle initiates the next cycle automatically whereby all supplementary steps are carried

out by a predetermined program
4 HAZARDS

Abrasive blasting equipment shall be designed to take into consideration the hazards, the

safety requirements and the preventative measures referred to in clause 5.

A parameter for the level of safety measures to be applied is the risk of accident to be

expected, the extent of which depends upon the highest foreseeable degree of severity and

effect as well as the probability of an injury e.g. exposure to risk (frequency of intervention or

access or duration of stay in a danger zone). Movable safeguards or facilities with guarding

functions in danger zones with fixed cycle intervention or access (e.g. during filling with

molten metal, periodical manual cleaning, or trouble shooting) require a special degree of

safety against unexpected start up or dangerous movements, as well as against hazardous

sources and failure of relevant safeguards and control systems.

An assessment of the foreseeable risks arising from the intended use of the equipment was

carried out when this standard was prepared. When additional risks are present it is

recommended that EN 292-1 and EN 292-2 together with the relevant A and B standards are

used as a basis for dealing with these additional risks.
This assessment formed the basis for determining
a) The safety features which shall be incorporated into the equipment;
b) Any special instructions which shall be communicated to the user.

The hazards and hazardous situations are tabulated in clause 5 (table 1) together with the

appropriate safety measures.
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EN 1248:2001
5 SAFETY REQUIREMENTS AND/OR MEASURES
5.1 General

The preventative measures assigned in table 1 to the identified hazardous situations shall be

provided by the manufacturer.

In addition, equipment shall comply, as appropriate, with the standards given in clause 2.

Where access is gained through guards/doors into a working area the safety related parts of the

electro-mechanical/electronic control system shall be in accordance with category 3 of

EN 954-1:1996. The hydraulic and pneumatic systems shall be in accordance with category 1

of EN 954-1:1996.

Emergency stop equipment shall be in accordance with EN 418 (where applicable, for

determination of categories see table 1).

Where it is possible to gain access to a hazardous area which is not protected by a movable

guard or door, access shall be prevented by fixed guards in accordance with EN 294, EN 953

and EN 1088.

When selecting the adequate solution the manufacturer shall apply the following principles in

the given order:

1) Elimination or minimisation of risks by integration of the safety concept into the design

of the machine.
2) Establishment of adequate safety measures against remaining risks (e.g. guard
scaffolding, light barriers)

3) Instruction to personnel concerning the remaining risks (e.g. service manuals, danger

signs).

When more than one measure is necessary to safeguard a hazard then all the necessary

measures shall be used. When selecting the safety requirements and/or measures consideration

shall be given to the different hazards that may appear at the same time. Warning signs alone

are not sufficient in cases of significant risk.

The last column of table 1 indicates the means of verification of the safety requirements

and/or measures. The abbreviations V, P, M and D are defined as follows:

V: Visual inspection is used to verify the features necessary for the requirement by visual

examination of the components supplied.

P: Performance check/test verifies that the features provided perform their function in such

a way that the requirement is met.

If a performance check is necessary details shall be given by the manufacturer in the

instruction handbook (see 7.3).
M: Measurement verifies that requirements are met, to the specified limits.

D: Drawings and/or calculations verify that the design characteristics of the components

provided meet the requirements.
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Page 10
EN 1248:2001
Table 1 - Safety requirements and/or measures
Hazard Hazardous Situation Safety measures according to the Verifi-
mentioned standards AND/OR specific cation
measures
5.2 Centrifugal wheel assembly
(see Annex B, figures B.2 and B.3)
5.2.1 Access to shear traps 3.22.5 of EN 292-1:1991 and V, D
Shearing and between fixed and internal interlocking guard with guard locking
crushing. rotating parts from either a according EN 953 and EN 1088,
Cutting and hooded wheel or accessible connected with stop category 1
severing through a door when the according 4.1.5 of EN 418:1992.
wheel is running up or
down.
5.2.2 Exposure to thrown off 3.22.5 of EN 292-1:1991 and V
Impact by abrasive media/workpiece EN 953, e.g. withstand the impact of
ejection of parts or projectile. propelled abrasive media as well as an
escaping wheel blade whilst the wheel
is running.
5.2.3 Access to pneumatic/ 3.22.1 of EN 292-1:1991 (Fixed guard) V
Cutting, hydraulic actuated moving 3.8 of EN 292-2:1991
severing parts of the abrasive media Ensure possibility of depressurising
crushing feed valve, e.g. in case of when isolating the machine.
trouble-shooting (clogging
within pipes) and during
maintenance.
5.3 Blasting chamber
5.3.1 Blasting chamber of centrifugal blasting machines
5.3.1.1 Access to the blasting 3.22.5 of EN 292-1:1991 and V,D
Crushing, chamber with doors. 5.4.1 of EN 1088:1995 connected with
shearing, Movement of the wheels stop category 1 according 4.1.5 of
cutting, impact and/or wheel blades EN 418:1992.
escaping whilst the wheel is An interlocking guard with guard
running. locking shall be fitted to prevent the
wheel starting unless the blasting
chamber doors are closed and to
prevent the doors being opened until
the wheels have come to a complete
stop.
(continued)
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EN 1248:2001
Table 1 (continued)
Hazard Hazardous Situation Safety measures according to the Verifi-
mentioned standards AND/OR specific cation
measures
It shall not be possible to open the V
door(s) until the abrasive media flow
had been shut off.
Either
a) the wheels shall have come to a
complete stop;
b) the wheel hood covers shall be in
closed position.
The start up of the wheels or the
opening movement of the wheel hood
covers shall only be possible after the
doors are closed
3.7 of EN 292-2:1991 and EN 1037
(Design control system to prevent un-
expected start-up/restart).
5.3.1.2 Ejection of blasting Clause 3 of EN 292-2:1991 (Risk V
Impact, abrasive media at entry and reduction by design). The abrasive
abrasive media exit points of machines. material shall be prevented from
attack escaping from the blasting chamber e.g.
by the use of labyrinth of curtains,
compressed air (see Annex B, figure
B.4).
It is not possible to give precise details
of the preventative measures because of
the nature of the abrasive media and the
size/shape of the workpiece to be
blasted.
5.4c of EN 292-2:1991 (Manufacturer
shall specify the use of eye protection),
see 7.3.1.
(continued)
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EN 1248:2001
Table 1 (continued)
Hazard Hazardous Situation Safety measures according to the Verifi-
mentioned standards AND/OR specific cation
measures
5.3.1.3 Persons being trapped Interlocking devices which prevent V
Crushing, inside the blasting chamber start-up shall be fitted, e.g. removable
impact, at the start of the operating handles, electronic locks.
abrasive media cycle e.g.
attack — in the case of blasting In addition devices shall be fitted V, P
chambers permitting the which allow escape of persons from
entry of personnel where inside the accessible chamber (see
full access is possible Annex B, figures B.5 and B.6), e.g.
from the surrounding — doors openable from inside the
floor areas or platforms chamber
without further means — illuminated emergency stop device
(e.g. ladders) for the inside the chamber positioned by
purposes of inspection, each door (EN 292-2:1991, 6.1.1).
— cleaning, removal of
dropped workpieces, Warning signs (EN 61310-1) stating V
— trouble-shooting, "Do not enter the blasting chamber
— simultaneous unless the machine is isolated".
maintenance by operator
or maintenance people.
5.3.1.4 Alternative use of 3.22.4 of EN 292-1:1991 and EN 1088. V, P
Abrasive media centrifugal blasting An interlock between the wheel drive
attack machines for air blasting, and air blasting system (e.g. a key
unexpected start of system) shall be fitted to prevent
centrifugal blasting wheel rotation of the centrifugal wheel during
during air blasting. manual air blasting.
5.3.1.5 Movement of power-driven Use one or more of the following V
Crushing doors when opening and measures as appropriate:
impact shutting. 4.2.2.6 of EN 292-2:1991
Crushing between door and (Construction of edges, see Annex B,
frame or structure. figure B.5),
3.23.5 of EN 292-1:1991 (Trip devices,
performance shall be in accordance
with EN 999 and 10.7.2 of
EN 60204-1:1997)
3.23.3 of EN 292-1:1991 (Hold-to-run
control devices - for doors visible from
the control panel),
EN 349 (Safety distances)
(continued)
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EN 1248:2001
Table 1 (continued)
Hazard Hazardous Situation Safety measures according to the Verifi-
mentioned standards AND/OR specific cation
measures
The operating manual shall provide
instructions to avoid danger points due
to machine positioning and instruction
for floor marking.
5.3.1.6 Unexpected closing of 3.23.6 of EN 292-1:1991 V
Crushing and doors under gravity. Devices to prevent the doors falling
shearing from the open position such as
– Self actuated mechanical restraint
devices with direct effect on the
door or
– Check valves or control valves that
are directly attached to the working
cylinders and that lock closed
automatically in the event of
pressure loss shall meet EN 982.
5.3.1.7 Falling of parts caused by Design of the hook with a safety factor D, V
Crushing abrasive wear of load of four to allow abrasive wear.
hooks.
Reference shall be made in the
instruction handbook that the hooks
shall be replaced when limits of hook
wear have been reached. The
instruction handbook shall state the
limit of the permissible hook wear.
Building up of the hook by welding is
prohibited.
Rotary drum falling out of Mechanical safety device, e.g. restraint D, V
blasting machine. rolls in the rolling area (such rolls shall
be designed to accommodate the mass
of the rotary drum and its designed load
or capacity and to withstand the weight
of the drum and its payload)
(continued)
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EN 1248:2001
Table 1 (continued)
Hazard Hazardous Situation Safety measures according to the Verifi-
mentioned standards AND/OR specific cation
measures
5.3.1.8 Slip, trip within a walk-in Install anti-slip floorplates or grids V
Slip, trip blasting chamber inside the chamber
permitting the entry of (for apertures see EN 294)
personnel for inspection,
cleaning, maintenance or
trouble-shooting.
5.3.2 Blasting chamber of air blasting machines
5.3.2.1 Start of the blasting process 3.22.4 of EN 292-1:1991 and EN 1088 V, D
Abrasive media if doors are opened or (Interlocked door)
attack opening of doors during Design to ensure that blasting cannot
(environment blasting. be initiated until the doors are closed.
and persons Opening of a door shall stop the
coming from blasting process.
outside)
5.3.2.2 Persons being trapped Interlocking devices which prevent V
Crushing, inside the blasting chamber start-up shall be fitted, e.g. removable
impact, at the start of the operating handles, key system, electronic locks
abrasive media cycle e.g. (see also 5.9).
attack – in the case of blasting
chambers permitting the In addition devices shall be fitted V, P
entry of personnel which allow escape of persons from
where full access is inside the accessible chamber, e.g.
possible from the – doors openable from inside the
surrounding floor areas chamber
or platforms without – illuminated emergency stop device
further means (e.g. inside the chamber positioned by
ladders) for the each door (EN 292-2:1991, 6.1.1).
purposes of inspection
– cleaning, removal of Warning signs (EN 61310-1) stating V
dropped workpieces "Do not enter the blasting chamber
– trouble-shooting unless the machine is isolated".
– simultaneous mainten-
ance by operator or
maintenance people.
(continued)
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EN 1248:2001
Table 1 (continued)
Hazard Hazardous Situation Safety measures according to the Verifi-
mentioned standards AND/OR specific cation
measures
5.3.2.3 Movement of power-driven Use one or more of the following V
Crushing doors when opening and measures as appropriate:
impact shutting. 4.2.2.6 of EN 292-2:1991
Crushing between door and (Construction of edges),
frame or structure. 3.23.5 of EN 292-1:1991 (Trip devices,
performance shall be in accordance
with EN 999 and 10.7.2 of
EN 60204-1:1997),
3.23.3 of EN 292-1:1991 (Hold-to-run
control devices - for doors visible from
the control panel),
EN 349 (Safety distances)
The operating manual shall provide
instructions to avoid danger points due
to machine positioning and instruction
for floor marking.
5.3.2.4 Unexpected closing of 3.23.6 of EN 292-1:1991 V
Crushing and doors under gravity. Devices to prevent the doors falling
shearing from the open position such as
– Self actuated mechanical restraint
devices with direct effect on the
door or
– Check valves or control valves that
are directly attached to the working
cylinders and that lock closed
automatically in the event of
pressure loss shall meet EN 982.
5.3.2.5 Slip, trip within a walk-in Install anti-slip floorplates or grids V
Slip, trip blasting chamber inside the chamber
permitting the entry of For apertures see EN 294.
personnel for inspection,
cleaning, maintenance or
trouble-shooting.
(continued)
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EN 1248:2001
Table 1 (continued)
Hazard Hazardous Situation Safety measures according to the Verifi-
mentioned standards AND/OR specific cation
measures
5.3.3 Wheel blasting machine intermittently used for manual air blasting
(additional requirements to 5.3.1 and 5.3.2)
5.3.3.1 Alternative use of 3.22.4 of EN 292-1:1991 V, D
Abrasive media centrifugal blasting Wheel drive and air blasting interlock
attack machines for air blasting, device to prevent a start of the
unexpected start of centrifugal wheel movement during
centrifugal blasting wheel manual air blasting (see EN 1088).
during air blasting.
Free jet work inside the 3.22.4 of EN 292-1:1991 and V, M
blasting chamber. EN 1088 (interlocked door)
Uncontrolled movement of 3.23.3 of EN 292-1:1991 (Provision of
the nozzle and/or release of hold-to-run nozzle control device with
abrasive media if the hand a maximum overrun time of 1 s)
held device is released.
5.3.3.2 Free jet work inside the Provision of communication means V, D
Restriction of blasting chamber. such as "Viewing window".
communication
5.4 Abrasive media and contaminants conveying system
5.4.1 Access to danger zones 3.22.1 of EN 292-1:1991 (e.g. fixed V
Crushing, between fixed and rotating floorplates to walk on)
shearing, or movable parts of the Safety distances according to EN 349
cutting following open conveying Apertures according to EN 294
systems:
 screw conveyor;
 belt conveyor;
 vibrating or scraper
conveyor;
 hopper;
 bucket elevator; In addition for bucket elevators: V
3.23.6 of EN 292-1:1991 and EN 953
 hopper discharge
(Fit anti-run back device to prevent
conveyor.
return movement of single side loaded
elevator)
5.4.2 Access to exposed shaft 3.22.1 of EN 292-1:1991 and EN 953 V
Entanglement ends. (Fit fixed guard)
(continued)
---------------------- Page: 17 ----------------------
Page 17
EN 1248:2001
Table 1 (continued)
Hazard Hazardous Situation Safety measures according to the Verifi-
mentioned standards AND/OR specific cation
measures
5.4.3 Disintegration and flying Designed to EN 286-1 V, D
Impact/crash off of pressurised parts of
(due to inade- the air blasting equipment. NOTE:
quacy of mech- Other EC Directives may apply to this
anical strength) equipment, e.g. pressure vessels
87/404/EEC (as amended by
90/488/EEC), pressure equipment
97/23/EC
5.5 Abrasive media and contaminants cleaning, separation and storage device
5.5.1 Access to 3.22.1 of EN 292-1:1991 and EN 953 V
Cutting or  abrasive media transfer (Fit fixed guard e.g. cover plate)
severing screw conveyor;
 rotating screens or
drums;
 powered abrasive media 3.22.1 of EN 292-1:1991 and EN 953
feed valves. (Fit fixed covering)
5.5.2 Access to exposed shaft 3.22.1 of EN 292-1:1991 and EN 953 V
Entanglement ends. (Fit fixed guard)
5.5.3 Any parts subject to Adequate earthing of conductive parts V, M

Electrostatic electrostatic charge (parts and the use of anti-static material for

phenomena which have a specific abrasive media blasting hoses (see
resistance of more than 10
EN ISO 3861 and CENELEC
m or parts which have a R044-001, February 1999).
specific resistance of less
than 10 m but a
resistance to earth of more
than 10 ) such as hoses,
linings, nozzles, holding
devices for workpieces,
dust collection hoppers.
(continued)
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...

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