Where should a steam trap be installed in a piping system?

In a piping system, steam traps are most effectively installed at the lowest points. This positioning is critical because condensate, which is water formed when steam cools, gravities downwards and collects at the low points in the system. By placing the steam trap here, it can efficiently remove the condensate from the steam line, preventing water accumulation, which can lead to water hammer and reduced system efficiency.

Additionally, installing the steam trap at a low point allows for effective drainage without the need for additional pumps, as the flow of condensate is aided by gravity. This ensures the steam system operates smoothly and maintains optimal performance by preventing the loss of steam energy.

In contrast, other choices, such as the coldest point or hottest point, do not facilitate the proper removal of condensate. The coldest point is often where water accumulates, making it ineffective for steam trap operation. The hottest point generally contains steam, not condensate, making it unsuitable for trapping. Lastly, while installing a trap at the highest point could allow for some steam to condense, it doesn't allow for effective drainage due to the gravitational forces acting on the condensate.