Abstract
Many pipeline rehabilitation methods are available for large pipe systems greater than 2 inches in diameter. For small internal systems with many lateral connections, the cost of these methods becomes exorbitant. This study examined the feasibility of an in situ lining rehabilitation concept for small pipelines that involves minimal surface preparation. This work addressed: testing and modification of candidate liner resins, hydraulic analysis of lining impact on pipe flow, and the life cycle cost comparison of applying a liner compared with typical plumbing maintenance practices. Analytical projections based on these analyses revealed a potential source of life cycle cost savings by applying this rehabilitation process to condensate return lines. A liner formulation involving Bisphenol-A and 1% silica addition exhibited sufficient high temperature immersion resistance to operate in a condensate return line. The mathematical liner impact model developed herein provides a qualitative representation of the liner impact on flow. Analytical findings derived from this model indicated that power savings are significantly dependant on pipe diameter and flow rate. A present worth, life cycle cost analysis revealed that if the cost of in situ rehabilitation is roughly 50% of replacement, the benefits may be revealed in terms of avoided operations, maintenance, and repair costs.
