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Double Mechanical Seal
What is Double Mechanical Seal?
A Double Mechanical Seal is a type of sealing system used in pumps and rotating equipment to prevent leakage of process fluids, especially when handling hazardous, toxic, or expensive liquids. It consists of two sets of mechanical seals arranged in a way that enhances reliability and safety compared to a single mechanical seal.
A Double Mechanical Seal provides redundant sealing protection, making it ideal for critical applications where leakage prevention is essential. It is more expensive than a single seal but offers greater reliability and safety.
How Double Mechanical Seal Works:
- Primary (Inner) Seal – The first seal faces the process fluid and is the main barrier against leakage.
- Secondary (Outer) Seal – The second seal acts as a backup in case the primary seal fails.
- Barrier/Buffer Fluid – A clean, pressurized fluid (usually a lubricant or compatible liquid/gas) is introduced between the two seals to:
Lubricate and cool the seal faces.
Prevent process fluid from escaping.
Detect seal failure (leakage into or out of the barrier system triggers alarms).
Types of Double Mechanical Seals?
- Back-to-Back (Tandem) Seals – The seals face opposite directions, often used with a barrier fluid at lower pressure than the process.
- Face-to-Face (Double Cartridge) Seals – The seals face each other, typically pressurized with a barrier fluid at higher pressure than the process.
- Tandem Seals (Unpressurized) – Used when leakage control is critical, but no external pressure is applied.
Advantages:
- Enhanced Safety – Reduces the risk of leakage, especially for hazardous fluids.
- Longer Lifespan – The secondary seal extends operational life if the primary seal fails.
- Better for Critical Applications – Ideal for corrosive, abrasive, high-pressure, or high-temperature fluids.
- Leak Detection – Barrier fluid systems allow for monitoring and early failure detection.
Why Trust Singh Flo Tek?
- Decades of Expertise – Proven track record in fluid transfer solutions.
- ISO-Certified Manufacturing – Quality assurance at every stage.
- Custom Engineering Support – Solutions tailored to your exact needs.
- Global Supply & Support – Timely delivery and after-sales service.
Singh Flo-Tek manufacturers high quality Mechanical Seal & Rotary union. Contact us for your custom requirements.