To prevent sewer gas from passing into the house, Logan vitrified clay pipe traps are formed with a deep bend below the flow line in which gasses are trapped in a liquid seal.
"Forty percent of our system is clay...We televised these lines based on the original risk equation, which indicated that due to age, these should be our areas of most significant risk. But they haven't degraded at all over time. Based on the way these pipes look they could easily last 200, 300 or 400 years."
Terry Martin, P.E.
Strategic Advisor to the
Corporate Asset Management Group
Seattle, Washington
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