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  2. Theatre platform - Wikipedia

    en.wikipedia.org/wiki/Theatre_platform

    In theatre, a platform (also referred to as a riser or rostrum) is a stationary, standard flat walking surface for actors to perform on. Typically, they are built to be assembled modularly. Typically, they are built to be assembled modularly.

  3. Riser (casting) - Wikipedia

    en.wikipedia.org/wiki/Riser_(casting)

    A bronze casting showing the sprue and risers. A riser, also known as a feeder, [1] is a reservoir built into a metal casting mold to prevent cavities due to shrinkage.Most metals are less dense as a liquid than as a solid so castings shrink upon cooling, which can leave a void at the last point to solidify.

  4. Drilling riser - Wikipedia

    en.wikipedia.org/wiki/Drilling_Riser

    Drilling riser joints with buoyancy modules. A drilling riser is a conduit that provides a temporary extension of a subsea oil well to a surface drilling facility. Drilling risers are categorised into two types: marine drilling risers used with subsea blowout preventer (BOP) and generally used by floating drilling vessels; and tie-back drilling risers used with a surface BOP and generally ...

  5. 3-ring release system - Wikipedia

    en.wikipedia.org/wiki/3-ring_release_system

    Front and side views of a 3-ring (mini rings) release system on a single riser of a packed main parachute. Since the introduction of the 3-ring system, variations in the design have raised safety concerns. For example, the move to mini rings and mini risers caused riser failures on some designs [6] until riser strength