Final answer:
The color band for ammonia piping containing vapor is typically yellow. This is a standardized safety color coding for flammable gases.
Thus correct option is D) yellow.
Step-by-step explanation:
Ammonia can be corrosive, so it is crucial to use materials that are compatible with ammonia and can withstand its corrosive nature. Common materials for ammonia piping include carbon steel, stainless steel, and some specialized alloys.
In the context of industrial safety and pipe marking standards, the color band for ammonia piping that contains vapor is typically yellow. This color coding is part of the standardized system that is designed to provide quick and clear information about the contents and associated risks of different pipes in a facility.
The color yellow is specifically assigned to gases that are flammable and other materials that also have a flammable range.
Thus correct option is D) yellow.