What should not be present in steam systems that would reduce the capacity of the piping?

In steam systems, drip pockets are designed to collect condensate and ensure that it drains properly, minimizing the potential for water accumulation in the steam lines. However, the presence of drip pockets does not inherently reduce the capacity of the piping; rather, it plays a critical role in maintaining system efficiency by preventing water hammer and ensuring that steam remains in its gaseous state as it travels through the pipes.

On the other hand, leaks in the system would indeed compromise the capacity of the piping by allowing steam to escape, leading to reduced pressure and efficiency. Heat exchangers and regulators are necessary components within steam systems for various purposes, such as transferring heat or controlling steam flow, and are essential for the overall operation of the system.

Therefore, while drip pockets serve a specific function and are necessary for the proper function of steam systems, their presence does not reduce the capacity of the piping in the same way as leaks do.