1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 1612-1:1997 ICS 83.
2、200 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Plasticsandrubber machines Reaction moulding machines Part 1. Safety requirements for metering and mixing units +A1:2008National foreword This British Standard is the UK implementation of EN 1612-1:1997+ A1:2008. It supersede
3、s BS EN 1612-1:1997 which is withdrawn. The start and finish of text introduced or altered by amendment is indicated in the text by tags. Tags indicating changes to CEN text carry the number of the CEN amendment. For example, text altered by CEN amendment A1 is indicated by !“. The UK participation
4、in its preparation was entrusted by Technical Committee MCE/3, Safeguarding of machinery, to Subcommittee MCE/3/2, Rubber and plastics machine Safety. A list of organizations represented on this subcommittee can be obtained on request to its secretary. This publication does not purport to include al
5、l the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. BS EN 1612-1:1997+A1:2008 Amendments/corrigenda issued since publication Date Comments 30 June 2009 Implementation of CEN ame
6、ndment A1:2008 This British Standard was published under the authority of the Standards Board and comes into effect on 15 December 1997 BSI 2009 ISBN 978 0 580 61060 8 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1612-1:1997+A1 August 2008 ICS 83.200 Supersedes EN 1612-1:1997 English Version
7、 Plastics and rubber machines - Reaction moulding machines - Part 1: Safety requirements for metering and mixing units Machines pour les matires plastiques et le caoutchouc - Machines de moulage par raction - Partie 1: Prescriptions de scurit relatives aux units de dosage et de mlange Kunststoff- un
8、d Gummimaschinen - Reaktionsgiemaschinen - Teil 1: Sicherheitsanforderungen an Misch- und Dosiereinheiten This European Standard was approved by CEN on 11 July 1997 and includes Amendment 1 approved by CEN on 8 June 2008. CEN members are bound to comply with the CEN/CENELEC Internal Regulations whic
9、h 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 CEN Management Centre or to any CEN member. This European St
10、andard 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 CEN Management Centre has the same status as the official versions. CEN members are the national
11、standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and Unite
12、d Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2008 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1612-1:1997
13、+A1:2008: EEN 1612-1:1997+A1:2008 (E) 2 Contents Page Foreword3 Introduction .4 1 Scope 4 2 Normative references 4 3 Definitions 5 4 List of hazards6 5 Safety requirements and/or measures 6 6 Verification of the safety requirements and/or measures .8 7 Information for use 9 Annex ZA (informative) !
14、! ! !Relationship between this European Standard and the Essential Requirements of EU Directive 98/37/EC“ “ “ “.11 Annex ZB (informative) ! ! ! !Relationship between this European Standard and the Essential Requirements of EU Directive 2006/42/EC“ “ “ “.12 BS EN 1612-1:1997+A1:2008EN 1612-1:1997+A1:
15、2008 (E) 3 Foreword This document (EN 1612-1:1997+A1:2008) has been prepared by Technical Committee CEN/TC 145 “Plastics and rubber machines”, the secretariat of which is held by UNI. This European Standard shall be given the status of a national standard, either by publication of an identical text
16、or by endorsement, at the latest by February 2009, and conflicting national standards shall be withdrawn at the latest by December 2009. This document includes Amendment 1, approved by CEN on 2008-06-08. The main changes compared to the previous version are: Modification of the main element of the t
17、itle Editorial modification of Annex ZA Addition of Annex ZB editorial changes of EN 292-1:1991 to EN ISO 12100-1 and of EN 292-2:1991 to EN ISO 12100- 2:2003 in the following clauses: Introduction, 2, 7. This document supersedes EN 1612-1:1997. The start and finish of text introduced or altered by
18、amendment is indicated in the text by tags ! “. 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 EU Directive(s). !For relationship with EU Directive(s), see informative An
19、nexes ZA and ZB, which are integral parts of this document.“ According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland
20、, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. BS EN 1612-1:1997+A1:2008EN 1612-1:1997+A1:2008 (E) 4 Introduction This European Stand
21、ard is a type C Standard as defined in !EN ISO 12100“. The extent to which hazards are covered is indicated in the scope of this standard. In addition, machinery shall comply as appropriate with !EN ISO 12100“ for hazards which are not covered by this standard. 1 Scope This standard specifies the he
22、alth and safety requirements for the design of metering and mixing units for reaction moulding machines. The significant and specific hazards are listed in clause 4 and are dealt with in this standard. This standard does not cover completely the hazards arising from the use of highly flammable addit
23、ives, for example, pentane used as a blowing agent (see 4.7), because these hazards depend to a large extent on the additives and processes used. This standard does not cover the hazards arising from the assembly of separate units not supplied at the same time by the same manufacturer. This standard
24、 does not cover the hazards arising from the movement of powered mixing heads; for these, see !EN 1612-2“. This standard applies to metering and mixing units manufactured after the date of publication of this standard. 2 Normative references This standard incorporates by dated or undated reference p
25、rovisions from other publications. These normative references are cited at 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 b
26、y amendment or revision. For undated references the latest edition of the publication referred to applies. !deleted text“ EN 418:1992, Safety of machinery - Emergency stop equipment, functional aspects - Principles for design EN 563, Safety of machinery - Temperatures of touchable surfaces - Ergonom
27、ics data to establish limit values for hot surfaces EN 954-1, Safety of machinery - Safety related parts of control systems - Part 1: General principles for design !EN 1005“, Safety of machinery Human physical performance EN 60204-1:1992, Safety of machinery - Electrical equipment of machines - Part
28、 1: General requirements !(IEC 60204-1:1992, modified)“ !EN ISO 12100-1, Safety of machinery - Basic concepts, general principles for design - Part 1: Basic terminology, methodology (ISO 12100-1:2003) BS EN 1612-1:1997+A1:2008EN 1612-1:1997+A1:2008 (E) 5 EN ISO 12100-2:2003, Safety of machinery - Ba
29、sic concepts, general principles for design - Part 2: Technical principles (ISO 12100-2:2003)“ 3 Definitions For the purposes of this standard, the following definitions apply (see figure 1): 3.1 working tank a tank which is part of the metering and mixing unit and contains one of the components 3.2
30、 metering unit a unit for metering the components 3.3 mixing head the part of the metering and mixing unit for mixing and delivery which can be manually operated or powered (if powered, see !EN 1612-2“) 3.4 highly flammable additive an additive with a flash point 21C NOTE For the moment there is no
31、European Directive or Standard in existence Key 1 working tank 2 metering unit 3 mixing head Figure 1 Example of a metering and mixing unit BS EN 1612-1:1997+A1:2008EN 1612-1:1997+A1:2008 (E) 6 4 List of hazards 4.1 Hazards due to moving couplings 4.2 Hazards due to instability 4.3 Hazards due to wh
32、iplash of hoses following rupture or disconnection 4.4 Hazards due to fluid ejection 4.5 Hazards due to overpressure 4.6 Hazards due to elevated temperatures of manually operated mixing heads which can cause either burns or unexpected reactions on the part of the operator 4.7 Hazards due to contact
33、with the components, additives or a mixture of them or due to the inhalation of gases dangerous to health During manual filling of the working tanks; Due to leakage; During delivery of product through the mixing head. 4.8 Hazards due to incorrect connection of hoses 4.9 Hazards due to explosion wher
34、e highly flammable additives are used 4.10 Hazards due to neglect of ergonomic principles 4.11 Electrical hazards 4.12 Hazards due to failure of the control circuit 5 Safety requirements and/or measures 5.1 Hazards due to moving couplings The exposed couplings between pumps and motors shall be prote
35、cted by fixed guards. 5.2 Hazards due to instability Where independent fixings are used to support the mixing head they shall be bolted to the floor. See also clause 7. 5.3 Hazards due to whiplash of hoses Whiplash of hoses shall be prevented, for example by: Binding the hoses together; BS EN 1612-1
36、:1997+A1:2008EN 1612-1:1997+A1:2008 (E) 7 Attaching the hoses to a fixed part. This shall be done at least every 75 cm. In addition, flexible hoses and their connections shall be designed to prevent tearing from their fittings and unintentional detachment from connection points. Flexible hoses shall
37、 not be used to support the mixing head. 5.4 Hazards due to fluid ejection Hose assemblies shall be marked at their connection points with the nominal pressure, month and year of manufacture and the name of the manufacturer. Because of the need to replace hoses (see clause 7) a shot counter shall be
38、 provided for metering and mixing units which work at a pressure of more than 30 bar. Adjustment devices on the mixing head, for example screws or pins shall be designed in such a way that they are retained in the head so that unintentional complete removal of these devices and the resulting outflow
39、 of fluids is prevented. It shall not be possible for fluids to be released from the mixing head due to Failure of the energy supply and/or Unexpected restoration of the energy supply. This may be achieved for example By means of a valve which shall automatically close in case of any failure of the
40、energy supply; By a requirement to restart the machine at the control panel after any failure of the energy supply. The safety related parts of the control system for the mixing head shall be of at least category 1 of EN 954-1. 5.5 Hazards due to overpressure The metering and mixing unit shall be de
41、signed so that the pressure cannot exceed the maximum pressure specified by the manufacturer. This shall be achieved either: By limitation of the drive system for pumps or By one or more mechanical devices for example a pressure relief valve or bursting disc. Opening of the device(s) shall not give
42、rise to emissions to the environment. This may be achieved for example by the relief valve being vented into a vessel to contain any liquid released. 5.6 Hazards due to elevated temperatures of manually operated mixing heads Manually operated mixing heads where the temperature of the surface can exc
43、eed 50C shall be provided with handles. The temperature of the handles shall not exceed the limits set by EN 563. These handles shall be so designed that it is impossible for the operator to touch the mixing head whilst holding them. 5.7 Hazards due to contact or inhalation For manual filling of wor
44、king tanks, see clause 7. BS EN 1612-1:1997+A1:2008EN 1612-1:1997+A1:2008 (E) 8 The metering and mixing unit shall be designed so that leakage can be detected visually. Devices shall be provided to contain fluids which may escape from dynamic seals. A local exhaust ventilation system may be needed f
45、or the delivery area dependent on composition of the product (see clause 7). For contact due to splashing, see clause 7. 5.8 Hazards due to incorrect connection of hoses Hoses and their connection points shall be unambiguously and permanently marked. See also clause 7. 5.9 Hazards due to explosion w
46、here highly flammable additives are used Measures are required to prevent the build up of concentrations of highly flammable additives which could lead to an explosion. The methods to be adopted to achieve this depend on the additive and the process used. The measures shall take into account a failu
47、re of the safety related parts of the control system, the dynamic seals or the energy supply. See also clause 7. 5.10 Hazards due to neglect of ergonomic principles The force needed per operator to manipulate the mixing head shall not exceed the limit values given in !EN 1005“. See also clause 7. 5.
48、11 Electrical hazards Electrical equipment shall be in accordance with EN 60204-1. Stop functions shall be at least category 0 of 9.2.2 of EN 60204-1:1992. Emergency stops shall conform to either category 0 or 1 in accordance with 9.2.5.4 of EN 60204-1:1992. Emergency stop actuators shall be positio
49、ned in accordance with 4.4.2 of EN 418:1992. 5.12 Hazards due to failure of the control circuit The control system shall be designed in accordance with category 1 of EN 954-1. The control panel shall be equipped with a start control and a stop control. The start control shall require resetting after a power failure. See also 5.4. 6 Verification of the safety requirements and/or measures Verification of the safety requirements and/or measures shall be undertaken as shown in table 1 below. BS EN 1612-1:1997+A1:2008EN 1612-1:1997+A1:200
