US Patent 9540908 Containment work platform with protruding connection

A support platform for enabling a worker to service an oil well next to a wellhead having a valve tree includes:a) a platform having an upper floor, a lower floor and a cellar in between the floors;b) a platform having a periphery, a central opening and radially extending beams;c) a plurality of walls attached to the periphery of the platform, said beams connecting to said walls below said upper floor;d) a drain that enables fluid to drain from the upper floor to the lower floor;e) a coupler that spans between the floors for enabling a connection to be made between the platform and valve tree; andf) a liquid guard or other provision that disallows the escape of fluid from a floor via the central opening.