Downcomer vs. Riser — What's the Difference?

A pipe to conduct something downwards.

One who rises, especially from sleep

A large external pipe in a water-tube boiler, carrying unheated water from the steam drum down to the water drum as part of the circulation path.

The vertical part of a stair step.

A pipe for leading the hot gases from the top of a blast furnace downward to the regenerators, boilers, etc.

A platform, as for elevating a group of people above a crowd, often arranged with similar platforms in tiers.

A pipe to conduct something downwards;

Someone or something which rises.

A platform or stand used to lift or elevate something.

The vertical part of a step on a staircase.

(archery) The main body of a bow.

A vertical utility conduit, pipe or path between floors of a building for placement of cables (e.g. telephone, networking), or to convey fluids (e.g. gas, water).

A pipe connecting an individual exhaust port of an internal combustion engine to the muffler, particularly on aircraft.

A Manx cat with a showable short tail.

A strip of webbing joining a parachute's harness to the rigging lines.

A reservoir built into a metal casting mold to prevent the formation of cavities in the casting as the metal shrinks on cooling.

One who rises; as, an early riser.

The upright piece of a step, from tread to tread.

A shaft excavated from below upward.

A person who rises (especially from bed);

A vertical pipe in a building

Structural member consisting of the vertical part of a stair or step