An oil terminal operator in South Africa, handling multiple light petroleum products such as HSD, MA, and JET-A1 within its pipeline system, encountered the following key challenges:
● Volatile and complex media: Aviation fuels such as JET-A1 require extremely high sealing performance; even minor leakage poses significant safety risks.
● Frequent media switching: Reliable physical isolation is required during product changeover. Conventional valves cannot achieve absolute shut-off.
● Insufficient sealing performance: Standard gate valves and ball valves present a risk of internal leakage after prolonged service.
● Strict safety requirements: The client specified a clear requirement for “zero visible leakage.”
To address these operating conditions, Dervos Valves supplied a Slide Blind Valve, with the following key configurations:
Design Type: Slide Blind (Spectacle Blind / Line Blind)
● Switching between a solid plate and a spacer enables complete shut-off or full flow.
● Provides visual and verifiable positive isolation, meeting high safety requirements.
Sealing Design: Drip-tight Construction
● Effectively prevents leakage and evaporation of light hydrocarbons.
● Suitable for stringent sealing requirements of aviation fuel service.
Pressure Rating and Standards:
● Class 150, in accordance with ASME B16.34
● Flanged connection: Raised Face (RF)
Material: ASTM A105 Forged Steel
● Offers high mechanical strength and pressure resistance.
● Well-suited for petroleum service, balancing cost efficiency and reliability.
Operation: Worm Gear (Turbine Drive)
● Suitable for large diameter (10") applications, reducing manual effort.
● Enhances operational stability and safety during switching.
In actual operation, the slide blind valve enabled reliable physical isolation between different petroleum products, ensuring a clearly verifiable disconnected state during media switching. This fundamentally eliminates the risk of internal leakage associated with conventional valves.
The drip-tight design effectively controlled evaporation and leakage when handling light hydrocarbons such as HSD, MA, and JET-A1, significantly improving on-site safety performance. In addition, the worm gear operation provided smoother and more controlled switching, reducing manual effort and minimizing the risk of operational errors, even in large-diameter applications.
Overall, the solution not only met the client’s stringent requirements for high sealing integrity and safety, but also improved the operational stability and maintenance reliability of the pipeline system.
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