The Most Cost Effective Method for Eliminating Inflow

Manholes are a crucial part of the collection system. They serve as entryways to an extensive underground pipeline infrastructure. Today, the big picture is really the same as yesterdays and that is achieving the most cost effective and time saving methods for eliminating as much infiltration/inflow as possible. By addressing and implementing renewal techniques for one of the most critical and obvious portions of the collection system, "the manhole chimney" the big picture becomes more obtainable. Manhole chimneys were typically constructed poorly with shims and small pieces of brick and mortar. This area is subject to freeze/thaw conditions in many geographical areas. Poor construction practices and freeze/thaw conditions are direct causes of faulty chimneys and have been identified as a crucial source of inflow. Technology for renewing the vast network of pipelines and manholes is advancing with faster, more efficient, and more cost effective techniques. This paper will discuss new technologies for renewing and sealing the manhole chimney/ frame area using a (cured in-place manhole chimney liner). This paper will explain the simplicity of a one-size liner used to fit a host of various sized and configured manholes with minimal labor requirements. Most importantly, this paper explains the stringent protocol carried out by a third party engineering/testing laboratory to extrapolate longevity of a renewed chimney that has been subjected to severe freeze/thaw cycles.