ms Seven Seas Mariner is a passenger cruise ship with identification IMO number 9210139, MMSI number 311622000 and call-sign number C6VV8, registered in the Bahamas. The cruise ship is owned by NCL Norwegian (since 2014) and operated by Regent Seven Seas Cruises. The vessel debuted in 2001.
IRC 2003 Handrail height, measured vertically from the sloped plane adjoining the tread nosing, or finish surface of ramp slope, shall be not less than 34 inches (864mm) and not more than 38 inches (965 mm).
The following spatial requirements apply to stairs: ï· Minimum width above the handrail - 36 inches. ï· The minimum clear width from the handrail height to the treads is 31 Â½ inches for stairs with rails on one. side and 27 inches for stairs with rails on both sides. ï· Open risers are not permitted when the total rise of the stair exceeds 30 inches unless the open space is.