Page 82 - Trenchless Technology Piping Installation and Inspection

52 Cha pte r T w o

Cured-in-place
pipe (CIPP)

Thermoformed Sliplining
pipe (SL)
(THP)

Trenchless
renewal and
replacement
methods Modified
Close-fit pipe
(CFP) sliplining
(MSL)

Trenchless
Coatings and replacement
linings methods
(CL)
(TRM)

FIGURE 2.3 Basic trenchless renewal methods.

Basic Method Gravity Pipe Pressure Pipe
Pipe-Lining Methods
Cured-in-place pipe Yes Yes
Sliplining Yes Yes
Close-fit pipe Yes Yes
Coatings and linings Yes Yes
Modified sliplining Yes No
Thermoformed pipe Yes Yes
Trenchless Replacement Methods
Pipe bursting Yes Yes a
Pipe removal Yes No
Pipe extraction Yes No

a Only pipe splitting method (a variation of static pipe bursting), is suitable for pres-
sure water or natural gas pipes (such as existing cast iron or ductile iron pipes).
TABLE 2.3 Application of Trenchless Renewal and Replacement Methods