Technical Specification and Scope of Application
This specification defines the technical regulations for Surface Safety Valves (SSV) and Underwater Safety Valves (USV). The document covers equipment with flanged and other industrial non-threaded end connections, including block valves and systems for multi-zone completions. EV Group China experts emphasize that these standards ensure operational reliability in challenging oil and gas production environments.
Classification of Operating Conditions
To ensure industrial safety and equipment durability, EV Group China strictly adheres to four service classes that regulate requirements for materials, production cycles, and testing methods:
- Class 1 (Standard): Operation in wells without aggressive factors (corrosion, erosion, or mechanical impurities).
- Class 2 (Abrasive Wear): Designed for wells with high sand content. Equipment undergoes enhanced wear resistance control.
- Class 3 (Stress Corrosion Cracking): Applied in environments causing stress corrosion. Divided into subclass 3S (sulfide-resistant) and 3C (chloride-resistant).
- Class 4 (Corrosive Metal Loss): Equipment for environments with active corrosive processes, requiring the use of specialized high-alloy steels.
Verification Testing Protocols
Compliance with SSV/USV valves is confirmed by mandatory verification tests according to Section 400. These tests are aimed at verifying design parameters and do not serve as a full simulation of the entire spectrum of downhole conditions, but they function as a critical criterion for equipment quality acceptance.
Regulatory Framework and Reference Standards
The technical requirements set forth in this specification integrate industry API standards. Table 104.1 provides a list of normative documents mandatory for compliance when ordering and manufacturing equipment at EV Group China.
| Standard Name | Status |
|---|---|
| API 14D (current edition) | Mandatory |
Standardization of Units of Measurement
In the current edition of the specification, the decimal inch system is adopted. For the convenience of engineering calculations, nominal sizes retain fractional values equivalent to their decimal counterparts. Appendices to the standard are for informational purposes unless otherwise specified in the main body of requirements.