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42 Annulus: the free space between the new and existing pipe that is typically grouted in conjunc- tion with trenchless renewal. Close-fit pipe (CFP): a trenchless renewal method consisting of inserting a new, deformed, or folded pipe into the existing pipe and after insertion expanding the new pipe to its original size and shape to be tight against the inside of the existing pipe. Culvert: a buried hydraulically designed structure used to convey surface water and stormwater runoff by gravity from one side of an embankment to another. Used interchangeably with pipe in this report. Cured-in-place pipe (CIPP): a trenchless renewal method consisting of inserting a flexible, resin-impregnated fabric tube into the existing pipe, expanding or inflating the tube, and curing the resin using heat or ultraviolet light. In-line replacement (ILR): a trenchless renewal method consisting of replacing existing pipes along the existing alignment using pipe bursting or pipe removal methods. Manhole: a surface accessible structure that allows access to a pipe. Sometimes called a main- tenance hole. Modified sliplining (MSL): a trenchless renewal method consisting of assembling a new liner consisting of pipe segments, structural plate, panels, or strips, in the case of the spiral-wound method, within a personnel-accessible existing pipe. Pipe: a tube or conduit for conveying fluid. Typically constructed of steel, aluminum, concrete, polyethylene, high-density polyethylene, or polyvinylchloride when used in a stormwater sys- tem. Used interchangeably with culvert in this report. Pipe bursting: an ILR method of splitting or pushing outward the existing pipe coincident with installing a new pipe. Pipe removal: an ILR method of reaming or crushing the existing pipe into pieces or pulling or pushing the intact existing pipe out of the ground while installing the new pipe. Renewal: to upgrade, rehabilitate, and renovate the performance and increase the design or service life of an existing stormwater facility. Repair: reconstruction of a short section of pipe or small section of liner within a stormwater facility. Distinct from rehabilitation in that there is no change to anticipated design or service life of the complete sections of a pipe (e.g., manhole to manhole, inlet to outlet, etc.). Replacement: installing a new pipe along an alignment using methods that do not rely upon the presence of an existing pipe to facilitate construction. Glossary
Glossary 43 Sliplining (SL): a trenchless renewal method consisting of inserting a new, smaller diameter pipeline into the existing pipe. Typically includes grouting the annular space between the new and existing pipe. Spray-in-place pipe (SIPP): a trenchless renewal method consisting of spraying a cementitious or polymer coating on the inside of the existing pipe. Storm sewer: see culvert.