Material Combinations (Optional)
Seal Faces:
Silicon Carbide (SiC) / Silicon Carbide (SiC) (standard for abrasive/corrosive services)
Carbon Graphite / Silicon Carbide (SiC)
Tungsten Carbide (TC) / Tungsten Carbide (TC)
Secondary Seals:
EPDM, FKM (Viton), PTFE, FFKM
Metal Bellows (316L, Inconel 600, Hastelloy C‑276)
Metal Components: 304, 316L Stainless Steel, Duplex Steel, Alloy 20
MOR 528 is a double‑end, balanced, fully cartridge‑mounted mechanical seal engineered for critical process pump applications. Designed to comply with API 610 and API 682 standards, it provides zero‑emission sealing for toxic, corrosive, and high‑temperature fluids. This pre‑assembled unit eliminates on‑site adjustment, ensuring fast, error‑free installation and maximum operational reliability in refineries, chemical plants, and petrochemical facilities.
Features
Double‑End Balanced Cartridge Structure
Dual seal faces and balanced geometry reduce face loading, minimizing friction and heat generation while enabling safe operation at higher pressures. The cartridge design integrates all components into one unit, requiring no spring compression measurement during installation.
Isolated Barrier Fluid Ports
Equipped with dedicated inlet/outlet ports (protected by blue caps in the image) to support API Plan 52, 53, or 54 schemes. This allows for effective cooling, lubrication, and containment of process fluids, preventing environmental emissions.
Robust Drive Mechanism
Positive drive pins or keys ensure reliable torque transmission between the shaft and seal, eliminating slippage and ensuring consistent performance regardless of rotation direction.
Compact & Interchangeable Design
Fits standard API 610 pump cavities and is a direct interchangeable replacement for John Crane Type 528, AESSEAL CAPI A, and other equivalent double cartridge seals.
No Dynamic Elastomer Option
Available with metal bellows or elastomer secondary seals, adapting to high‑temperature and corrosive environments where traditional O‑rings fail.
Advantages
Zero Emission Compliance: Double‑end design prevents release of toxic or hazardous fluids.
Error‑Free Installation: Pre‑assembled cartridge unit eliminates setup mistakes and reduces downtime.
High Reliability: Balanced faces and robust materials ensure long service life in severe conditions.
Versatile Compatibility: Supports multiple API flush plans and fits most standard process pumps.
Interchangeability: Direct replacement for major OEM double cartridge seals.
Applications
Petrochemical & Refining: Crude oil, hot hydrocarbons, and toxic chemicals
Chemical Processing: Acids, alkalis, solvents, and hazardous fluids
Pharmaceutical & Fine Chemicals: Sterile, zero‑emission processes
Power Generation: Flue gas desulfurization (FGD) and boiler feed water
OEM Replacements: Direct fit for John Crane Type 528, Cartex DN, and API 682 Category 2 seals
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