SSV

Definition: 
Surface Safety Valve (ESD - See comment)
Subject Area 1: 
Production Engineering
Remarks: 
The surface safety valve (SSV) is a hydraulically actuated fail-safe gate valve for testing oil and gas wells with high flow rates (>1,280 m3/d [>8,000 bbl/d] or >850,000 m3/d [30,000,000 ft3/d]), high pressures (>34,475 Pa [>5,000 psi]), or the presence of H2S. The SSV is used to quickly shut in the well upstream of the choke manifold in the event of overpressure, failure, a leak in downstream equipment, or any other well emergency requiring an immediate shut-in. The SSV is remotely operated by an emergency shutdown device (ESD), which can be triggered automatically by high- or low-pressure pilot actuators. If an emergency occurs, this feature reduces the possibility of personnel injuries. A number of SSV models are available for different well conditions (pressures, temperatures, and flow rates) and with various connections, such as Grayloc® or API-6A flanges. All SSV models have interchangeable crossover connections and are protected by a compact, removable lifting frame. The SSV uses a proven metal-to-metal, double-sealing design for harsh environment operations and complies with all applicable environmental requirements. All SSVs are manufactured under Type Approval or Design Verification Review and provided with a Certificate of Conformity and full quality file.