- ENGINEERING INFO
- CASE STUDIES
The new anaerobic wastewater treatment system at the T.F. Green Airport in Warwick, Rhode Island treats collected deicer fluid (propylene glycol) prior to discharge to the Warwick Sewer Authority. Two pump stations collect the deicer runoff which is conveyed to the treatment plant through Fusible PVC® pipe. The first pipeline employs 4,662 feet of 18-inch DR25 Fusible PVC® pipe to convey the glycol runoff from the main terminal. The second pipeline uses 10,500 feet of 12-inch DR25 Fusible PVC® pipe to transport runoff from an outlying terminal to the treatment plant. Both pipelines were installed via open-cut trenching in January 2014. The new deicer management system is part of a larger improvement and expansion project to extend the runways and enhance safety at the airport. The overall airport project is expected to be complete in 2017.
The engineering firm for the project, Gresham, Smith and Partners, specified Fusible PV®C pipe because of its material strength, which creates a favorable internal/external diameter relationship. With the long distance between the pump stations and the treatment plant, a larger internal pipe diameter was required to maintain the necessary flow rate. Competitive pipe material options would have required a larger outside diameter pipe to maintain the same internal pressure, leading to higher costs.
The pipe stiffness of Fusible PVC®pipe also influenced the engineer’s decision-making. With a wet environment and sandy backfill, it was important to use a pipe material that was less likely to sag. Existing underground infrastructure at T.F. Green Airport (cables and pipes) needed to be carefully circumvented. Fusible PVC® pipe’s bend radius and flexibility made it easier to maneuver around the numerous obstacles. In some locations on the project, quick installation overnight during flight downtime was crucial. In these situations, Fusible PVC® pipe was fused during the day, excavation was completed during the night, and pipe was installed and backfilled before morning when the first flights were scheduled to depart.
Toward the end of the project design phase, Gresham, Smith and Partners’ engineer, Mark Ervin, P.E., realized there was one runway area that could not be excavated at all, day or night. By using 18-inch Fusible PVC® pipe they were able to slipline into an abandoned 24-inch storm water sewer pipe beneath the runway. Fusible PVC® pipe was essential to making this creative solution a reality by providing a large enough internal diameter to maintain the required flow rate while fitting through the existing 24-inch pipeline.
|Pipeline Details and Project Summary|
|Project:||T.F. Green Airport Deicer Management System|
|Pipe Size:||4,662 LF of 18” DR25 Fusible PVC® 10,500 LF 12” DR25 Fusible PVC®|
|Owner:||RI Airport Corporation|