Other Safety Interlocks and Features

Low- and high-level alarms on the main hydraulic reservoir tank are normally included to alert the operator that a hydraulic leak or backflow of process fluids from the well through the control tubing has occurred.

The hydraulic fluid reservoir must be adequately vented to prevent any pressure buildup caused by returning fluid during an emergency shutdown of all the SCSSVs, or in case of backflow from the well through the control tubing.

A low-pressure alarm on the automatic hydraulic pump discharge alerts the operator of a pump malfunction before the SCSSVs all close against operating wells.

Exact requirements for surface-controlled systems for SCSSVs used on offshore platforms are covered in API RP 14B and shown in Figure 1700-14.

Schematic of a Control System for SCSSVs

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