- B.2 As a minimum requirement, closing units for subsea installations should be equipped with accumulator bottles with sufficient volumetric capacity to provide the usable fluid volume (with pumps inoperative) to close and open the ram preventers and one annular preventer. Usable fluid volume is defined as the volume of fluid recoverable from an accumulator between the accumulator operating pressure and 200 psi above the precharge pressure.
- B.3 In sizing subsea mounted bottles, the additional precharge pressure required to offset the hydrostatic head of the sea-water column and the effect of subsea temperature should be considered.
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