definition
strict definition
retractable roof opening time
The minimum time needed for a mechanically retractable roof to move from fully closed to fully open.
The retractable roof opening time for any structure is the minimum amount of time it takes to open a mechanically retractable roof completely, from its fullest closed position to its fullest open position. This applies especially to convertible stadiums.
This is a measurement of the installation as it runs, not a property of the building. Lift speeds are reset, drives are slowed as they age, and a roof that opened in ten minutes when new can take longer later, so a duration belongs to the date it was taken on.
Where several installations exist, the value describes the one named in the field and not an average of them.
Related definitions
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escalator ride time (max)
The ride time from beginning to end of the longest escalator in a structure. -
journey duration
The time needed to ride a complete track or defined course from its beginning to its end. -
non-stop elevator ride time
The uninterrupted bottom-to-top ride time in an elevator, using the minimum journey time in the longest elevator for a whole building. -
planned lifetime
The length of time that an object is designed to last, as of the end of the design phase. -
rotation time
The amount of time in which a moving part of a structure rotates or revolves at maximum speed.