Abstract: Means are provided for latching a Vertically Moored Platform riser spacer to the riser pipes which connect a floating platform to a subsea anchor. This includes a spring loaded latch pin recessed in a hole in the riser donut housing which surrounds the riser and which is released by pulling a spring loaded latch release pin to let the latch pin move outwardly to a latched position where it is held in this position by a spring loaded shear pin. To disengage the latch pin, a hydraulic ram or other means can be used to shear the retaining pins and remove the latch pin.

Abstract: This is a subsurface safety valve for insertion in a tubing string in a well drilled in the earth, normally for the production of oil and gas. This valve is lowered and retrieved by wireline and is seated in a special side-pocket mandrel which is a part of the tubing string. One suitable valve is a flapper-type, full-opening valve having a folding or collapsing flapper that permits it to retract completely into the side pocket, thereby leaving a full opening through the valve and tubing string when open. The valve may be controlled either by hydraulic pressure transmitted to it from the surface or by subsurface pressure sensing means.