1、 Reference number ISO 29042-9:2011(E) ISO 2011INTERNATIONAL STANDARD ISO 29042-9 First edition 2011-01-15 Safety of machinery Evaluation of the emission of airborne hazardous substances Part 9: Decontamination index Scurit des machines valuation de lmission de substances dangereuses vhicules par lai
2、r Partie 9: Indice dassainissement ISO 29042-9:2011(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the comp
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6、ssion in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2011 All rights reser
7、vedISO 29042-9:2011(E) ISO 2011 All rights reserved iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees.
8、 Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the Interna
9、tional Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Stan
10、dards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subje
11、ct of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 29042-9 was prepared by Technical Committee ISO/TC 199, Safety of machinery. ISO 29042 consists of the following parts, under the general title Safety of machinery Evaluation of the emission of
12、airborne hazardous substances: Part 1: Selection of test methods Part 2: Tracer gas method for the measurement of the emission rate of a given pollutant Part 3: Test bench method for the measurement of the emission rate of a given pollutant Part 4: Tracer method for the measurement of the capture ef
13、ficiency of an exhaust system Part 5: Test bench method for the measurement of the separation efficiency by mass of air cleaning systems with unducted outlet Part 6: Test bench method for the measurement of the separation efficiency by mass of air cleaning systems with ducted outlet Part 7: Test ben
14、ch method for the measurement of the pollutant concentration parameter Part 8: Room method for the measurement of the pollutant concentration parameter Part 9: Decontamination index ISO 29042-9:2011(E) iv ISO 2011 All rights reservedIntroduction The structure of safety standards in the field of mach
15、inery is as follows: a) Type-A standards (basic safety standards) giving basic concepts, principles for design, and general aspects that can be applied to all machinery; b) Type-B standards (generic safety standards) dealing with one safety aspect or one type of safeguard that can be used across a w
16、ide range of machinery: type-B1 standards on particular safety aspects (e.g. safety distances, surface temperature, noise); type-B2 standards on safeguards (e.g. two-hand controls, interlocking devices, pressure-sensitive devices, guards); c) Type-C standards (machine safety standards) dealing with
17、detailed safety requirements for a particular machine or group of machines. This document is a type-B standard as stated in ISO 12100. The requirements of this document can be supplemented or modified by a type-C standard. For machines which are covered by the scope of a type-C standard and which ha
18、ve been designed and built according to the requirements of that standard, the requirements of that type-C standard take precedence. ISO/TC 199 has a mandate in this area to produce type-A and type-B standards, which will allow verification of conformity with the essential safety requirements. ISO 2
19、9042-9 is based on EN 1093-11:2001, amended by Amendment 1:2008, published by the European Committee for Standardization (CEN). INTERNATIONAL STANDARD ISO 29042-9:2011(E) ISO 2011 All rights reserved 1Safety of machinery Evaluation of the emission of airborne hazardous substances Part 9: Decontamina
20、tion index WARNING It should be observed that during the test, especially during the shutdown or the removal of the pollutant control system, the concentration of hazardous substances, if present, can reach levels which are liable to incur a risk to the health of the operators or other occupants pre
21、sent in the room. This part of ISO 29042 does not deal with the protective measures required to control these risks. 1 Scope This part of ISO 29042 specifies a method for the measurement of the decontamination index of pollutant control systems, e.g. capture devices including local exhaust ventilati
22、on, water spray systems and, when appropriate, separation equipment installed on a machine. This method uses the real pollutant (see ISO 29042-1:2008, 4.2) and can be operated in room or field environments. Measurement of the decontamination index of a pollutant control system can serve for the: a)
23、evaluation of the performance of a pollutant control system of a machine; b) evaluation of the improvement of a pollutant control system; c) comparison of pollutant control systems for machines of similar design; d) ranking of pollutant control systems according to their decontamination efficiency;
24、e) determination of the air flow rate in the case of an exhaust system to achieve a given level; f) determination of the state of the art of pollutant control systems for machines with respect to the decontamination efficiency. 2 Normative references The following referenced documents are indispensa
25、ble for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 12100, Safety of machinery General principles for design Risk assessment and risk reduction IS
26、O 29042-9:2011(E) 2 ISO 2011 All rights reserved3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 12100 and the following apply. 3.1 decontamination index I Aaverage of the ratio, obtained at a number of specified locations in the surroundings, of the
27、ambient air quality improvement to the real pollutant mean concentration with the pollutant control system not in operation NOTE 1 Corrections can be necessary to take into account air pollution caused by other operations (“the background level”). NOTE 2 The ambient air quality improvement is given
28、by the difference between the real pollutant concentrations measured in these surroundings with and without the pollutant control system in operation. NOTE 3 When particle size distribution is determined at the same time as pollutant concentration, a decontamination index for each size fraction can
29、be determined. See, for example, ISO 7708. 4 Principle The principle of this measurement method consists in determining the decontamination index as defined in 3.1, the concentrations being measured at predetermined points around the machinery under inspection and in interpreting the value of this i
30、ndex, taking into account its range of variation and the influencing factors. 5 Determination of concentration measurement points The measurement points shall be determined by pre-testing to ensure that they are in zones of measurable emission. The number and precise positions shall be specified in
31、type-C standards. 6 Test method 6.1 General The measurement is more accurate and the interpretation more reliable if the background level concentration is low. Whenever possible, the concentration measurements should be taken with the surrounding machinery and other processes shut down. Once the loc
32、ations of the measurement points have been selected, the measurement procedure takes place in three phases (see 6.2 to 6.4). These three phases are repeated twice. An example with two measurement points is given in Figure 1. The measurement procedures used for the determination of the pollutant conc
33、entration shall comply with the appropriate International Standards. For the measurement of the air flow rate see ISO 3966, ISO 4006, ISO 5167-1 and ISO 5168 1) . 1) EN 1093-11:2001+A1:2008 also refers to ISO 4053-1:1977 and ISO 7145:1982 which, however, have been withdrawn. ISO 29042-9:2011(E) ISO
34、2011 All rights reserved 36.2 Phase 1: Measurement of C fiFor the determination of the concentration level, C fi , resulting from the pollutant emission of the surrounding machinery and other processes (background level), the machine under test is shut down as well as its pollutant control system, i
35、f already installed. The operating conditions of the surrounding machinery and other processes are recorded. When stable conditions are reached, the concentrations are measured at the selected measurement points (see Figure 1). The sampling duration at each measurement point shall correspond to a re
36、presentative fraction of the duration of the pollutant emission of the surrounding machinery and other processes. At each measurement point at least three measurements shall be made. a) Phase 1: measurement of C fi(see 6.2) b) Phase 2: measurement of C mi(see 6.3) c) Phase 3: measurement of C ai(see
37、 6.4) Key A capture device B machine 1, 2 measurement points aAir flow rate at zero. bAir flow rate as specified. cPollutant emission. Figure 1 Example of measurement procedure ISO 29042-9:2011(E) 4 ISO 2011 All rights reserved6.3 Phase 2: Measurement of C miFor this phase, the machine under test is
38、 in operation. Its pollutant control system is installed and in operation. The operating conditions of the machine and its associated pollutant control systems shall be specified. The measurements of concentration are carried out following the same specifications as in phase 1: stable conditions, lo
39、cation of the measurement points, sampling duration, operating conditions of the surrounding machinery and other processes. Checks shall be carried out to confirm that, as closely as possible, the same conditions prevail as in phase 1. The sampling duration at each measurement point shall correspond
40、 to a representative fraction of the duration of the pollutant emission from the machine under test. At each measurement point at least three measurements shall be made. 6.4 Phase 3: Measurement of C aiThe machine under test remains in operation in the same conditions as in phase 2, but with its pol
41、lutant control system shut down or removed. The test cannot be performed where blockage of the extraction is likely to occur. WARNING Switching off or altering the pollutant control system can, in some instances, lead to exposures of operators or occupants in the room to hazardous pollutant levels.
42、In these instances, appropriate preventive measures shall be taken to minimize the risk to which people are exposed. The measurements of concentration are carried out in a similar way to the two other phases. However, it should be observed that it can require a long stabilization time before stable
43、conditions are established in the room. At each measurement point at least three measurements shall be made. 7 Application to specific groups of machines Given the variety of situations encountered (e.g. types of rooms, machinery, working methods, type of product, type of activity, nature of polluta
44、nt), it does not seem possible to define a completely fixed method, independent of the different factors mentioned. If in type-C standards additional information on specific conditions is given, the locations of air sampling points, the test and sampling duration, and the operating conditions of the
45、 machine should be specified. 8 Influencing factors Many factors are likely to influence the measurement results. An attempt should be made to identify and, if possible, to evaluate them. In particular, the following should be recorded: data relative to the machine under test, type of working proces
46、s, type of product processed, type of operation (continuous, batch, cyclic), duration of operation; data relative to the surrounding machinery and other processes; data relative to the pollutant control system, especially the exhaust air flow rate in case of a capture device; data relative to the se
47、paration system, especially the flow rates; ISO 29042-9:2011(E) ISO 2011 All rights reserved 5 the dimensions of the room; data relative to the room geometry (e.g. location of the machine); data relative to the general ventilation system, especially the characteristics of the air input and exhaust e
48、quipment, including disturbing cross-draught velocities. It can be useful, as well, to record the ambient air temperature and humidity. Some methodological difficulties can limit the field of application of this method, for instance: it can be necessary to carry out a large number of measurements to
49、 take into account the heterogeneity of the pollution in space and/or time; special attention should be paid to the minimization of the fluctuations of the exhaust air flow rate or of the air flow pattern, particularly inside the premises during the periods when the machine or associated ventilation are on or off. 9 Expression of results The decontamination index is calculated by Equation (1): am A af 1 1 n ii ii i CC I nCC = = (1) where C aiis the real pollutant concentration m
