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If you suspect a leak has occurred, the American Petroleum Institute suggest that you look for the following warning signs.
Sight - Look around the pipeline area. Visually, a leak could appear as an accumulation of liquid on the ground near the pipeline, or a dense white cloud of fog over the leak location. Spots of discoloration among otherwise green vegetation surrounding the pipeline may also indicate a leak.
Sound - Listen for an unusual noise coming from the pipeline. A leak can make a hissing or a roaring sound, depending on the magnitude of the leak.
Smell - Detecting an unusual odor could be an indication of a pipeline leak. A liquid petroleum leak will be accompanied by a strong scent. Each liquid petroleum product has its own characteristic odor.
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