The flowserve double mechanical seal is a high-performance safety and containment solution engineered for critical pumps handling volatile hydrocarbons. This configuration, offered as a reliable Flowserve double mechanical seal alternative, consists of two sets of sealing faces arranged in series with a barrier fluid between them. It is designed specifically as a robust hydrocarbon pump mechanical seal to prevent hazardous fluid emissions, meet stringent environmental regulations, and ensure operational safety.
Key Features
• Hydrocarbon Specialist: A robust double cartridge seal (similar to ISC2-BB or QB series) designed for light hydrocarbons, volatile organic compounds (VOCs), and crude oil services.
• Zero Emissions: Operates with a pressurized barrier fluid (API Plan 53A/B/C) to ensure zero leakage of hazardous hydrocarbons to the atmosphere.
• API 682 Compliant: Flowserve double mechanical seals are designed in accordance with API 682 Category 1 or 2 standards for safety and reliability in refinery environments.
• Pumping Ring Efficiency: Features a high-flow internal pumping ring that aggressively circulates barrier fluid around the Flowserve pump seal assembly, effectively removing heat generated by the seal faces and maintaining stable operating temperatures even during continuous heavy-duty cycles.
• Tangential Ports: Gland ports are drilled tangentially to minimize flow resistance and maximize cooling efficiency.
Technical Specs | Materials | ||
Mediums | Water, oil and weakly-corrosive mediums | Stationary Ring | Carbon/Sic |
Pressure | ≤0.3MPa | Rotary Ring | Ceramic/Sic |
Temperature | -20℃ to 100℃ | Secondary Seal | NBR/EPDM/Viton |
Speed | ≤10m/s | Spring and Metal Part | Stainless Steel |
Product Specifications
| Model | Shaft | D2 | D3 | D7 | L1 | L2 | L4 |
| 10 | 10 | 24.0 | 29.0 | 23.0 | 7.0 | 6.0 | 4.0 |
| 12S | 12 | 28.6 | 32.0 | 25.0 | 8.0 | 5.2 | 5.0 |
| 12M | 12 | 30.0 | 35.0 | 24.0 | 8.0 | 5.0 | 5.0 |
| 12L | 12 | 33.4 | 38.0 | 25.0 | 6.7 | 6.3 | 5.0 |
| 16 | 16 | 36.5 | 41.5 | 31.0 | 8.0 | 6.8 | 5.0 |
| 16L | 16 | 38.1 | 43.5 | 31.0 | 8.0 | 6.8 | 5.0 |
| 16LD | 16 | 38.1 | 43.5 | 31.0 | 8.0 | 6.8 | 5.0 |
| 20S | 20 | 38.0 | 43.8 | 35.0 | 9.5 | 6.0 | 5.0 |
| 20 | 20 | 40.0 | 43.8 | 35.0 | 9.5 | 6.0 | 5.0 |
| 25S | 25 | 46.0 | 51.0 | 44.0 | 10.0 | 8.0 | 7.0 |
| 25M | 25 | 47.0 | 51.0 | 44.0 | 12.0 | 6.0 | 7.0 |
| 25L | 25 | 52.0 | 57.0 | 48.0 | 12.0 | 6.0 | 7.0 |
| 30 | 30 | 52.0 | 57.0 | 48.0 | 11.0 | 8.0 | 8.0 |
| 1/2" | 12.7 | 30.0 | 35.0 | 25.4 | 8.0 | 5.0 | 6.2 |
| 5/8" | 25.9 | 36.5 | 41.5 | 31.8 | 8.0 | 6.7 | 10.3 |
| 3/4" | 19.1 | 40.0 | 43.8 | 34.9 | 9.5 | 6.0 | 10.3 |
| 1" | 25.4 | 47.0 | 51.0 | 41.3 | 12.0 | 5.9 | 11.1 |
Workshop
This workshop is equipped with professional processing equipment and integrated with standardized material warehousing management, enabling a one-stop production process from precision machining to finished product delivery. It ensures part machining accuracy and production efficiency, meeting various high-specification manufacturing requirements.
Product Research, Development and Testing
Our Product R&D and Testing focuses on optimizing seal performance through advanced simulation and material analysis. All flowserve mechanical seals undergo rigorous trials, including thermal cycling and pressure tests, to ensure durability, minimal leakage, and long service life in demanding industrial environments.
Industry Solutions
Case Study
LPG Booster: An LPG hydrocarbon pump mechanical seal was freezing up due to vaporization. We installed this Double Hydrocarbon Seal with a Plan 53A glycol barrier system. The barrier fluid warmed the seal and prevented LPG flashing, ensuring safe operation.
Testimonials
We use these flowserve double mechanical seals on all our gasoline transfer pumps. No smells, no leaks, and they pass every EPA inspection.
—Terminal Manager, Oil Depot
FAQs about Flowserve Double Mechanical Seal for Hydrocarbon Pump
Q: Do I need a Plan 53 system?
A: For volatile hydrocarbons, yes. A pressurized Plan 53 system ensures the barrier fluid pressure is higher than the pump pressure, preventing the hydrocarbon from leaking out or flashing across the faces.
Q: Why use a double mechanical seal instead of a single seal for hydrocarbon pumps?
A: A double mechanical seal provides a critical safety barrier. It uses a pressurized barrier fluid between the two sets of faces to contain volatile hydrocarbons, preventing hazardous emissions and protecting against seal failure if the inner seal leaks. This is essential for environmental compliance and safety in refineries and chemical plants.
Q: Is this a direct replacement for my original Flowserve double seal?
A: Yes. MIAOYU's flowserve double mechanical seals are engineered to be dimensionally and functionally interchangeable with original Flowserve models. They are drop-in replacements for hydrocarbon pumps in API 682 applications, ensuring no pump modification is needed.
Q: Are aftermarket Flowserve pump seal replacements fully interchangeable with OEM specifications?
A:Yes, high-quality Flowserve pump seal replacements are engineered to match original OEM dimensions, pressure ratings, and material specifications (such as API 682 standards). This ensures direct interchangeability without modifying the pump stuffing box, providing a seamless mechanical seal replacement experience for centrifugal pumps and mixers.
Q: Can a Flowserve pump seal be operated under dry-running conditions?
A:No, you should never start up or run a Flowserve pump seal dry. The seal faces require a liquid film (process fluid or flush fluid) in the seal chamber at all times to dissipate heat and prevent immediate face damage or cracking. Always vent the pump casing and flood the seal chamber before startup.
Our company is specialized in the production of sealing materials, mechanical seals , cartridge seals.
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