remove a product. It is a best practice for your gas supplier to keep a record of lot codes and to whom the products were sold.
What is a Certificate of Analysis (COA)?
Te COA is a document that also pro-
vides evidence of traceability back through the supply chain to the NIST certification of the gas concentration in your cylinder. Tis document should be readily available from your gas provider and can be useful in the event instrument calibration or gas standard accuracy is challenged.
How do I dispose of Dry Gas cylinders?
As specified by DOT regulations, a dis- posable (non-refillable) compressed gas
cylinder is a container that must not be refilled and transported more than once. Cylinders of this type are always marked “DOT-39” on the botom or shoulder of the tank. Te design of non-refillable cylinders does not allow for safe multiple pressurizations of the cylinder. Federal law prohibits transportation if refilled. It is both dangerous and a serious offense to do so. Tese non-refillable cylinders are not hazardous when empty. Guidelines for Compressed Gas Cylinder disposal follow. 1. Dispose of contents in accordance with federal, state and local regulations.
2. Wear safety glasses, atach an appropri- ate compressed gas regulator to the cylinder valve and allow any residual gas to vent slowly in an unconfined,
well-ventilated area, exhaust hood or outside. Once you no longer hear the gas venting or the regulator reads “0” or “empty” the cylinder is empty.
3. Remove the regulator prior to disposal. 4. Render the cylinder unusable either by puting a hole in the cylinder (aſter the tank is completely vented) or by using a recycling tool like the one shown below to safely remove the cylinder valve from the neck of the tank. Te tool will also permit residual gas to vent safely. Your gas supplier will offer specially designed tools to do this. See Figure 3.
5. Dispose of the cylinder with solid waste or recycle in accordance with fed- eral, state and local regulations. Never atempt to incinerate the cylinder.
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