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stack downstream of the blower and.treatment system, you may inadvertently pressurize the <br /> canister. Only a DOT-approved sample cylinder should be used to transport pressurized air <br /> samples (see Section 5.4). Under no circumstances should an Air Toxics Ltd. canister be pressur- <br /> ized more than 5 psig for a 6 .L canister and 15 psig for a 1 L canister. Bleed off excess pressure <br /> by opening the valve temporarily while monitoring the canister with a pressure gauge. <br /> 5.4 Considerations for Sample Cylinder Sampling <br /> Sample cylinders, also known as "sample bombs", are DOT-approved,high pressure, thick-walled, <br /> stainless steel cylinders with a valve at each end. They were intended for collecting a pressurized <br /> sample for petroleum gas applications. Sample cylinders differ from sample canisters in that they do <br /> not have a Summa-passivated interior surface and are not evacuated prior to shipment. Sample <br /> cylinders are not suitable for analysis of hydrocarbons at ppbv levels. Sample cylinders can be used for <br /> analysis of natural gas by ASTM D-1945 and calculation of Btu by ASTM D-3588. Air Toxics Ltd. <br /> assumes that clients requesting a sample cylinder have a pressurized process and sample port with a <br /> built-in gauge and 1/4 in. Swagelock fitting to attach to the sample cylinder. Air Toxics Ltd. has an <br /> inventory of 500 mL sample cylinders that are particularly suited for landfill gas collection systems <br /> (i.e., LFG to energy applications). This section provides step-by-step procedures for sampling with a <br /> sample cylinder. <br /> Step-by-Step Procedures for Sample Cylinder Sampling <br /> These procedures are for a typical stationary source sampling application and actual.field conditions <br /> and procedures may vary. Follow all precautions in the site Health and Safety Plan when dealing with <br /> a pressurized sample port and sample cylinder. <br /> 1. Verify contents of the shipped package (e.g., chain-of-custody, sample cylinder, particulate <br /> filter). <br /> 2. Verify that gauge on sample port is working properly. <br /> 3. Purge sample port. <br /> 4. Remove brass caps on either end of cylinder. <br /> 5. Attach particulate filter to upstream valve. <br /> 6. Attach filter/cylinder assembly directly to the sample port. <br /> 7. Open both valves 1/2 turn. <br /> 8. Allow sample air to flow through sample cylinder(approximately 10 L for a 500 mL cylinder). <br /> atx Tox.tcs 1,TD. <br /> 24 <br />