GB/T 25749.9-2012 English PDFUS$214.00 ยท In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 25749.9-2012: Safety of machinery -- Evaluation of the emission of airborne-hazardous substances -- Part 9: Decontamination index Status: Valid
Basic dataStandard ID: GB/T 25749.9-2012 (GB/T25749.9-2012)Description (Translated English): Safety of machinery -- Evaluation of the emission of airborne-hazardous substances -- Part 9: Decontamination index Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: J09 Classification of International Standard: 13.110 Word Count Estimation: 11,165 Quoted Standard: ISO 12100 Adopted Standard: ISO 29042-9-2011, IDT Regulation (derived from): National Standards Bulletin No. 9 of 2012 Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China Summary: This standard specifies the pollution control system (eg: Contains local exhaust ventilation capture devices, sprinkler systems, and installed on the machine when appropriate separation equipment) Decontamination index measurement method. This method uses GB/T 25749.9-2012: Safety of machinery -- Evaluation of the emission of airborne-hazardous substances -- Part 9: Decontamination index---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order. Safety of machinery -- Evaluation of the emission of airborne-hazardous substances -- Part 9.Decontamination index ICS 13.110 J09 National Standards of People's Republic of China Mechanical Safety Airborne Hazardous Substances Emissions Assessment Part 9.Decontamination Index (ISO 29042-9.2011, IDT) Released on.2012-05-11 2012-12-01 Implementation General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Released by the Standardization Administration of China directory Preface I Introduction II 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Principle 2 5 Determine the concentration measurement point 2 6 Test method 2 7 Applications for specific machine groups 3 8 Influencing factors 4 9 Representation of results 4 10 Test report 4 Reference 6 Mechanical Safety Airborne Hazardous Substances Emissions Assessment Part 9.Decontamination Index WARNING. Attention should be paid to the concentration of hazardous substances (if present) during testing, especially during shutdown or removal of pollutant control systems. may reach levels that are likely to pose a health risk to the operator or other persons in the room. This section does not address the protective measures required to control such risks. 1 ScopeThis part of GB/T 25749 specifies pollutant control systems (e.g. capture equipment including local exhaust ventilation, sprinkler systems, and, where appropriate, separation equipment installed on the machine) method of measurement of the purification index. This method uses actual pollutants (see GB/T 25749.1- 4.2 in.2010), and can be performed in indoor or field environments. Measuring the purification index of a pollutant control system can be used to. a) evaluation of the performance of the machine's pollutant control system; b) evaluation of pollutant control system improvements; c) comparisons between machine pollutant control systems of similar design; d) Classification of pollutant control systems according to purification efficiency; e) determine the air flow of the exhaust system to the specified level; f) Determine the technical level of the machine pollutant control system according to the purification efficiency.2 Normative referencesThe following documents are essential for the application of this document. For dated references, only the dated version applies to this article pieces. For undated references, the latest edition (including all amendments) applies to this document. ISO 12100 Safety of machinery design general risk assessment and risk reduction (Safety of machinery-General principlesfordesign-Riskassessmentandriskreduction)3 Terms and DefinitionsISO 12100 and the following terms and definitions apply to this document. 3.1 decontaminationindex IA At several specified locations, the concentrations of pollutants with improved ambient air quality and the The average of the ratios between the mean concentrations of pollutants. Note 1.Taking into account the air pollution ("background concentration") caused by other operations, make corrections if necessary. NOTE 2 The improvement in ambient air quality is determined by the difference between the actual pollutant concentrations measured when the pollutant control system is operating or not operating in that environment. Express. Note 3.When the particle size distribution and pollutant concentration are determined at the same time, the purification index of each particle class can be determined. Examples can be found in ISO 7708.4 PrinciplesThe principle of this measurement method is to determine the decontamination index specified in 3.1 and the concentration measured at predetermined points around the machine under test, and the Explanation of the index value, taking into account its range of variation and influencing factors.5 Determine the concentration measurement pointMeasurement points should be determined by pre-testing to ensure that they are located within the measurable discharge area. The number and precise location of the measuring points should be Specified in Type C standards.6 Test methods6.1 Overview If the background concentration level is low, the measurement will be more accurate and its interpretation more reasonable. Whenever possible, concentration measurements should be The surrounding machines and other technological processes are stopped. Once the measurement point is selected, the measurement procedure will be carried out in three stages (see 6.2~6.4). These three phases are repeated at least twice. two test An example of a measuring point is given in Figure 1. Measurement procedures used to determine pollutant concentrations should comply with relevant international or national standards. Air flow measurement see GB/T 2624.1, GB/T 17611, ISO 3966 and ISO 5168. 6.2 Phase 1.Measuring Cfi When measuring the concentration level Cfi caused by pollutant discharge (background concentration) from surrounding machinery and other processes, the machine under inspection should be turned off If a pollutant control system has been installed, it should also be turned off. Record the operation of surrounding machinery and other processes. When stable conditions are reached, the concentration is measured at the selected measurement point (see Figure 1). The sampling duration at each measurement point should be the same as the surrounding A representative portion of the duration of pollutant emissions from machinery and other processes corresponds. At least 3 measurements should be made at each measurement point. 6.3 Phase 2.Measuring Cmi At this stage, the inspected machine is in operation, and the pollutant control system has been installed, which is also in operation. machine should be specified and the operating conditions of the pollutant control system to which it is connected. Concentration measurements are carried out according to the specifications in Phase 1.steady state, location of measurement points, sampling time, surrounding machines and other processes operating conditions. Inspections should be made to confirm that conditions are as close as possible to those in Phase 1. The sampling duration at each measurement point shall correspond to a representative portion of the pollutant discharge duration of the machine under test. At least 3 measurements should be made at each measurement point. 6.4 Phase 3.Measuring Cai The machine under inspection has its contamination control system turned off or removed and remains operational under the same conditions as in Phase 2.If the extraction system can If blockage can occur, the test should not be completed. WARNING. In some cases, shutting down or changing contaminant control systems can expose operators or persons in the room to dangerously contaminated water flat down. In these cases, appropriate protective measures should be taken to minimize the risk of personal exposure. Concentrations were measured in a similar manner to the first two stages. However, it should be noted that it may take a long time to stabilize indoors to reach the state. At least 3 measurements should be made at each measurement point.7 Applications for specific machine groupsTaking into account a variety of different practical situations (eg. room type, machinery, working method, product variety, operating category, pollutant characteristics), It is not easy to define a completely fixed method that is not bound by the different factors mentioned above. If the Type C standard gives additional information on specific conditions, the location of the air sampling point, the test, and the duration of sampling should be specified and the operating conditions of the machine.8 Influencing factorsMany factors can affect the measurement results. Attempts should be made to identify these factors and, if possible, evaluate these factors. very The following points should be recorded. ---Relevant data of the inspected machine, type of working process, type of processed product, type of operation (continuous, batch, cyclic formula), the duration of the operation; --- Relevant data of surrounding machines and other technological processes; --- data related to the pollutant control system, especially the exhaust flow of the capture device; --- Separation of system-related data, especially traffic; --- the dimensions of the room; --- data about the layout of the room (e.g. the location of the machine); --- Relevant data on the overall ventilation system, especially the characteristics of air entry and exhaust equipment, including the rate of cross-interference airflow. same It is also very useful to record air temperature and humidity. Some methodological difficulties may limit the application of this method in the field, such as. --- If the spatial and/or temporal differences of pollutants are considered, a large number of measurements are required; --- Special attention should be paid to minimize fluctuations in exhaust flow and airflow patterns, especially indoors, machines or ventilation devices connected to them Open or close period.9 Representation of resultsThe purification index is calculated by formula (1). The decontamination index was calculated for each measurement point and for each of the three measurements. Then calculate the average of the purification index of each measurement point value. The test result is the average value of the purification index of each measurement point. Other conditions remain unchanged, the higher the purification index, the higher the efficiency of the pollutant control system. Example. When IA=0, ie Ca=Cm, the purification system does not contribute to the improvement of air quality. However, when IA=1, that is, Cm=Cf, the purification system can Effectively make indoor air pollution reach the background concentration. 10 Test report The test report should contain at least the following information. b) Description of the machine under test and the air purification system for the pollutant control system under test (manufacturer, style, type, modification, design, size, Year of manufacture, serial number, etc.) - the machine itself and each additional piece of equipment; c) operating data during the test, including the tools used by the machine, the material processed by the machine and the air flow; d) description of the general ventilation system; e) a description of the measurement procedure, in particular. 1) method; 2) the location and sampling point of the emission source; 3) the duration of the measurement; f) the measuring instruments used and the time of the last calibration; g) environmental data (temperature, humidity, atmospheric pressure); h) a description of the procedures used for concentration and flow measurements (eg list of standards); i) test results, including the mean value and 95% confidence interval of different measurement points; j) a statement of deviation from any relevant standard; k) laboratory; l) The name of the person responsible for the test; m) test data; n) Other supplementary instructions. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 25749.9-2012_English be delivered?Answer: Upon your order, we will start to translate GB/T 25749.9-2012_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB/T 25749.9-2012_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 25749.9-2012_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay. |
