EPA Method 27 Determination Of Vapor Tightness Of Gasoline Delivery Tank Using Pressure Vacuum Test
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ID： |
F98B467EB1A04581A6E695AE8CE92F02 |
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文件大小(MB)： |
0.02 |
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页数： |
11 |
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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）：
1390,METHOD 27 - DETERMINATION OF VAPOR,TIGHTNESS OF GASOLINE DELIVERY TANK,USING PRESSURE VACUUM TEST,1.0 Scope and Application.,1.1 Applicability. This method is applicable for the,determination of vapor tightness of a gasoline delivery tank,which is equipped with vapor collection equipment.,2.0 Summary of Method.,2.1 Pressure and vacuum are applied alternately to,the compartments of a gasoline delivery tank and the change,in pressure or vacuum is recorded after a specified period,of time.,3.0 Definitions.,3.1 Allowable pressure change ()p) means the,allowable amount of decrease in pressure during the static,pressure test, within the time period t, as specified in the,appropriate regulation, in mm H2O.,3.2 Allowable vacuum change ()v) means the allowable,amount of decrease in vacuum during the static vacuum test,within the time period t, as specified in the appropriate,regulation, in mm H2O.,3.3 Compartment means a liquid-tight division of a,delivery tank.,3.4 Delivery tank means a container, including,associated pipes and fittings, that is attached to or forms,1391,a part of any truck, trailer, or railcar used for the,transport of gasoline.,3.5 Delivery tank vapor collection equipment means,any piping, hoses, and devices on the delivery tank used to,collect and route gasoline vapors either from the tank to a,bulk terminal vapor control system or from a bulk plant or,service station into the tank.,3.6 Gasoline means a petroleum distillate or,petroleum distillate/alcohol blend having a Reid vapor,pressure of 27.6 kilopascals or greater which is used as a,fuel for internal combustion engines.,3.7 Initial pressure (Pi) means the pressure applied,to the delivery tank at the beginning of the static pressure,test, as specified in the appropriate regulation, in mm H2O.,3.8 Initial vacuum (Vi) means the vacuum applied to,the delivery tank at the beginning of the static vacuum,test, as specified in the appropriate regulation, in mm H2O.,3.9 Time period of the pressure or vacuum test (t),means the time period of the test, as specified in the,appropriate regulation, during which the change in pressure,or vacuum is monitored, in minutes.,4.0 Interferences. [Reserved],5.0 Safety.,1392,5.1 Gasoline contains several volatile organic,compounds (e.g. benzene and hexane) which presents a,potential for fire and/or explosions. It is advisable to,take appropriate precautions when testing a gasoline,vessel's vapor tightness, such as refraining from smoking,and using explosion-proof equipment.,5.2 This method may involve hazardous materials,operations, and equipment. This test method my 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,determine the applicability of regulatory limitations prior,to performing this test method,6.0 Equipment and Supplies.,The following equipment and supplies are required for,testing:,6.1 Pressure Source. Pump or compressed gas cylinder,of air or inert gas sufficient to pressurize the delivery,tank to 500 mm (20 in.) H2O above atmospheric pressure.,6.2 Regulator. Low pressure regulator for,controlling pressurization of the delivery tank.,6.3 Vacuum Source. Vacuum pump capable of evacuating,the delivery tank to 250 mm (10 in.) H2O below atmospheric,pressure.,1393,6.4 Pressure-Vacuum Supply Hose.,6.5 Manometer. Liquid manometer, or equivalent,instrument, capable of measuring up to 500 mm (20 in.) H2O,gauge pressure with ± 2.5 mm (0.1 in.) H2O precision.,6.6 Pressure-Vacuum Relief Valves. The test,apparatus shall be equipped with an inline pressure-vacuum,relief valve set to activate at 675 mm (26.6 in.) H2O above,atmospheric pressure or 250 mm (10 in.) H2O below,atmospheric pressure, with a capacity equal to the,pressurizing or evacuating pumps.,6.7 Test Cap for Vapor Recovery Hose. This cap shall,have a tap for manometer connection and a fitting with shutoff,valve for connection to the pressure-vacuum supply hose.,6.8 Caps for Liquid Delivery Hoses.,7.0 Reagents and Standards. [Reserved],8.0 Sample Collection, Preservation, Storage, and,Transport.,8.1 Pretest Preparations.,8.1.1 Summary. Testing problems may occur due to the,presence of volatile vapors and/or temperature fluctuations,inside the delivery tank. Under these conditions, it is,often difficult to obtain a stable initial pressure at the,beginning of a test, and erroneous test results may occur.,To help prevent this, it is recommended that prior to,1394,testing, volatile vapors be removed from the tank and the,temperature inside the tank be allowed to stabilize.,Because it is not a……
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