EPA Method 14 Determination Of Fluoride Emissions From Potroom Roof Monitors For Primary Aluminum Plants
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ID： |
F1E760A7969B4AA487F3A9EB56441CB0 |
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文件大小(MB)： |
0.32 |
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页数： |
30 |
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文件格式： |
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日期： |
2000-2-12 |
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购买： |
文本摘录（文本识别可能有误，但文件阅览显示及打印正常，pdf文件可进行文字搜索定位）：
886,METHOD 14 - DETERMINATION OF FLUORIDE EMISSIONS,FROM POTROOM ROOF MONITORS FOR,PRIMARY ALUMINUM PLANTS,NOTE: This method does not include all of the,specifications (e.g., equipment and supplies) and procedures,(e.g., sampling and analytical) essential to its,performance. Some material is incorporated by reference,from other methods in this part. Therefore, to obtain,reliable results, persons using this method should have a,thorough knowledge of at least the following additional test,methods: Method 1, Method 2, Method 3, Method 5, Method 13A,and Method 13B.,1.0 Scope and Application.,1.1 Analytes.,Analyte CAS No. Sensitivity,Total fluorides,as Fluorine 7782-41-4 Not determined,1.2 Applicability. This method is applicable for the,determination of fluoride emissions from roof monitors at,primary aluminum reduction plant potroom groups.,1.3 Data Quality Objectives. Adherence to the,requirements of this method will enhance the quality of the,data obtained from air pollutant sampling methods.,2.0 Summary of Method.,887,2.1 Gaseous and particulate fluoride roof monitor,emissions are drawn into a permanent sampling manifold,through several large nozzles. The sample is transported,from the sampling manifold to ground level through a duct.,The fluoride content of the gas in the duct is determined,using either Method 13A or Method 13B. Effluent velocity,and volumetric flow rate are determined using anemometers,located in the roof monitor.,3.0 Definitions.,Potroom means a building unit which houses a group of,electrolytic cells in which aluminum is produced.,Potroom group means an uncontrolled potroom, a potroom,which is controlled individually, or a group of potrooms or,potroom segments ducted to a common control system.,Roof monitor means that portion of the roof of a,potroom where gases not captured at the cell exit from the,potroom.,4.0 Interferences.,Same as Section 4.0 of either Method 13A or Method,13B, with the addition of the following:,4.1 Magnetic Field Effects. Anemometer readings can,be affected by potroom magnetic field effects. Section 6.1,provides for minimization of this interference through,proper shielding or encasement of anemometer components.,888,5.0 Safety.,5.1 Disclaimer. This method may involve hazardous,materials, operations, and equipment. This test method may,not address all of the safety problems associated with its,use. It is the responsibility of the user of this test,method to establish appropriate safety and health practices,and to determine the applicability of regulatory limitations,prior to performing this test method.,5.2 Corrosive Reagents. Same as Section 5.2 of,either Method 13A or Method 13B.,6.0 Equipment and Supplies.,Same as Section 6.0 of either Method 13A or Method,13B, as applicable, with the addition of the following:,6.1 Velocity Measurement Apparatus.,6.1.1 Anemometer Specifications. Propeller,anemometers, or equivalent. Each anemometer shall meet the,following specifications:,6.1.1.1 Its propeller shall be made of polystyrene,or similar material of uniform density. To ensure,uniformity of performance among propellers, it is desirable,that all propellers be made from the same mold.,6.1.1.2 The propeller shall be properly balanced, to,optimize performance.,889,6.1.1.3 When the anemometer is mounted horizontally,its threshold velocity shall not exceed 15 m/min (50,ft/min).,6.1.1.4 The measurement range of the anemometer shall,extend to at least 600 m/min (2,000 ft/min).,6.1.1.5 The anemometer shall be able to withstand,prolonged exposure to dusty and corrosive environments; one,way of achieving this is to purge the bearings of the,anemometer continuously with filtered air during operation.,6.1.1.6 All anemometer components shall be properly,shielded or encased, such that the performance of the,anemometer is uninfluenced by potroom magnetic field,effects.,6.1.1.7 A known relationship shall exist between the,electrical output signal from the anemometer generator and,the propeller shaft rpm (see Section 10.2.1). Anemometers,having other types of output signals (e.g., optical) may be,used, subject to the approval of the Administrator. If,other types of anemometers are used, there must be a known,relationship between output signal and shaft rpm (see,Section 10.2.2).,6.1.1.8 Each anemometer shall be equipped with a,suitable readout system (see Section 6.1.3).,6.1.2 Anemometer Installation Requirements.,890,6.1.2.1 Single, Isolated Potroom. If the affected,facility consists of a single, isolated potroom (or potroom,segment), install at least one anemometer for every 85 m,(280 ft) of roof monitor length. If the length of the roof,monitor div……
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