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Replacement

The term “replacement” is used here to denote that a new pipe is being installed in the same space that is currently occupied by the existing pipe. This can be important in crowded rights-of-way where space to install a new pipe on another alignment may be very limited. Readers should be aware that the terms “on-line” or “off-line” can be used differently in the literature describing pipe replacement. One usage differentiates replacement methods as to whether the pipe can be replaced while it is still in service (on-line) or needs to be taken out of service or bypassed (off-line). The other usage differentiates as to whether the replacement pipe is installed in the same position as the existing pipe (on-line) or in a new alignment (off-line).

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