Lead pipe relative cost

Porritt (1934), pp. 69-70, replaced his lead pipes with pipes of block tin, but he was a relatively wealthy man. See chapter 7 for a discussion of the costs and benefits of block tin or tin-lined pipes. 

Duct and/or piping are necessary to deliver and discharge the process streams. The extent of the ductwork primarily depends on the location of the reactor relative to the main process and auxiliary equipment. Excessive ductwork can contribute significantly to the capital cost of the unit. In addition, it can lead to safety problems because of any potential condensation, even if it is insulated process steam piping can also be a concern. Drainage piping often comes into play. 

The incentives for considering the pool concept as an alternate design are its safety against primary pipe leaks and ruptures and its compact design, which may lead to lower overall capital costs. Potential advantages of the loop concept relate mainly to the ease of maintenance and access to primary system components, thus reflecting potential increases in overall plant availability. There also has been more experience behind this concept. It provides a relatively clear-cut separation of primary system components and places components in a more controllable and predictable environment. These considerations are discussed in more detail in the following section. 

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