September 2017
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Odorant Injection System Is Important for Safety

The main cause of explosions has always been natural gas leaks. Individual homes, small businesses and other structures are most frequently affected when an internal leak builds up gas inside the structure. Frequently, the blast will be enough to significantly damage a building but leave it standing. In these cases, the people inside tend to have minor to moderate injuries. Occasionally, the gas can collect in high enough quantities to cause a deadly explosion, disintegrating one or more buildings in the process.

Of primary importance, in the process of delivering gas for both industrial and public use, is providing for the safety of those who use it. Whether in the home, or workplace, the safety of all who use or live around natural gas systems is of primary concern. In order to assist in detecting leaks, a minute amount of odorant is added to the otherwise colorless and almost odourless gas used by consumers. The odour has been compared to the smell of rotten eggs, due to the added butyl mercaptan. Sometimes a related compound, thiophane may be used in the mixture. The system of injecting odour into natural gas is called Odorant injection system.

The basic objective of all Odorant Injection Systems is to provide a simple, reliable, “leak free” safe means of injecting odorant into gas proportional to metered flow. The Injection Rate Controller receives flow rate information from a flow measurement device and, using a microprocessor, automatically calculates the pump injection frequency required to meet a programmed injection rate. Low flow meter indicates that the odorant injection rate may be inaccurate The ability to track the flow rate present in the pipeline, and then match an injection frequency with that flow rate is termed flow-proportional injection and as previously mentioned, is the desired method of injection.

To set up the injection rate controller for operation basic information or parameters are entered into the controller program. While detailed system setup parameters can be programmed into the controller, the basic system parameters might include;

1. Injection rate desired (lb. /MMCF)

2. Chemical density of the selected odorant (lbs. /gallon)

3. Pump displacement selected (cc/pump stroke)

4. Minimum, maximum and normal flow rates

5. Flow input signal information (analog/pulse)

879The design of the injection rate controller should allow for a programmed fail safe parameter which would allow for a pre-set injection rate in the event that the flow signal between the flow measurement device and the injection system is compromise.

Natural gas has proven to be the fuel of the near future and the requirement for this safe, clean and relatively inexpensive fuel supply has given rise to various techniques of odorizing natural gas. To implement a successful odorant injection system you must have a working knowledge of the chemical odorant used, and be aware of handling these chemicals so you can be a good neighbor in the community served. As important is the implementation of injection systems which will perform the critical job of odorant injection as well as provide real time information regarding system performance, alarm on failure and reporting of system history of operation.

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