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Extra resources for Safe Handling of Light Ends

Example text

The handbrake must be set and the wheel chocks applied to prevent car movement. When these steps are completed, the liquid and vapour lines can be hooked up and the gauge rod set for about 30 inches (76 cm). When loading is complete, all valves should be closed. After 15 minutes, the gauge rod should be raised one inch or more, the valve checked for vapour, and the gauge rod then lowered until white mist appears. The gauge rod should be read and the gauging operation repeated. The gauge should be recorded to the nearest 1/4 inch.

One method of preventing this pressure build-up is to vent the receiving container back to the container being emptied. If this method of relieving pressure is used, it is preferable not to open the vent until the pressure in the container being filled is more than that in the container being emptied. No matter what method is used, however, the loader must keep a close watch of the pressure gauge on the receiving container to prevent overpressuring. Be sure that odorant is added to the product if it is required.

A fire or explosion could result if air were leaking into a flare-stack system. Flare systems are usually designed with a continuous purge or water seal to prevent air from being drawn back into the system. On catalytic reforming units, the mixture of flared gas is often lighter than air, largely because it contains appreciable quantities of hydrogen. This lighter than air gas may mean that a vacuum will be present in the piping and knockout drum at the base of the flare. Under these conditions, air will try to get into the system.

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