Can heat exchangers also be installed in pressurized wastewater pipelines?

Heat exchangers can also be installed in pressurized wastewater pipes. The only disadvantage compared to gravity pipelines is that the installation of the heat exchangers requires some underground engineering. Pressurized pipes must be opened up, and usually a whole section is replaced by a new pipe section with an integrated heat exchanger. This makes economic sense anytime a new pressurized pipeline is being built or an older one is being rehabilitated. However, if neither of these scenarios apply, the economic viability depends on the extent of the underground work required, which is different for every project. In the case of gravity pipelines, because they are walkable from a certain size upwards, the installation of heat exchangers does not require any underground construction work. This is why installing heat exchangers is generally worthwhile in these types of pipes.

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