Page 23 - Trenchless Technology Piping Installation and Inspection

xxii New Dev e l o p m e n t s

FIGURE 6 Pipe Thruster. (Source: Herrenknecht AG.)

be available or under development. Further, it should be noted that
underground pipeline construction and renewal projects present
many risks. There is no guarantee that the methods presented in
this book will be successful at all times and at all project and site
(surface and subsurface) conditions. Moreover, there is no endorse-
ment and/or recommendation of the proprietary methods, pipe
materials, and brand names mentioned in this book. The specified
method characteristics, diameter range, maxi mum installation, typi-
cal appli cation, and accuracy is based on project and site condi tions,
type of equipment used, and experience and training of the crews
and the operators. Design engineers, project owners, contractors,
government agencies, and all other par ties involved in trenchless
technology projects should consider the risks involved and assume
appropriate contingencies in the contract documents. Methods suc-
cessfully used in some applications may not be applicable in other
conditions due to change in project, site, and/or soil conditions.
Design engineers and pipeline owners need to be involved in the
selection of appropriate trenchless methods for their specific project
conditions and do not leave the trenchless method selection entirely
to the contractor.
As a final word, trenchless technology is developing at a fast rate.
Therefore, everyone involved in a trenchless technology construction
and renewal should keep abreast of latest developments. Some sources
of further information are provided at the end of this book. Other
sources are professional and trade conferences, industry magazines,
technical journals, professional and trade associations, and compa-
nies and organizations involved in trenchless equipment manufac-
turing, engineering, and contracting. Many information and case
studies of past projects are accessible through Web sites of these
organizations.