AST (Advanced Sealing Technology) has established itself as a leading provider of high-performance mechanical seals, designed to meet the demands of various industrial applications. From pumps and mixers to compressors and agitators, AST’s product line offers solutions that enhance reliability, reduce maintenance costs, and improve operational efficiency. This blog post will explore some of the key products offered by AST, highlighting their specific features and benefits. 

AST offers a comprehensive range of mechanical seals, each engineered for different industrial environments and applications. Here are some of the standout products: 

• Overview: The AST50 is designed to fit all ANSI pumps and many others where a single outside mechanical seal is needed, particularly in extremely corrosive environments or for low-pressure service. It’s ideal for non-metallic pumps like Fybroc and Flowserve GRP. 

• Applications: This seal is perfect for corrosive environments and food service applications where sanitation is critical. It’s a cost-effective alternative to seals made from exotic metals. 

• Key Features: The AST50 has no metal parts in contact with the fluid, and its springs are isolated. Installation is straightforward—slide the rotary unit over the shaft, tighten the drive ring, and remove the clips. The seal is internally balanced, so no expensive sleeves or pump modifications are required. 

• • Overview: The AST60 is a simple, easily installed seal, ideal for applications requiring a highly reliable, anti-clog solution. Its narrow seal face and hydraulic balance make it a cool-running option, with a floating rotary seal ring that prevents face distortion typical of shrink-fit designs. 
  • Applications: The AST60 is versatile, suited for power generation (cooling water, slurries), chemical processing (reagents, solvents), food processing (starches, slurries), wastewater treatment, HVAC systems, pulp and paper mills (brines, solutions), and steel mills (pollution control, cooling water). 
  • Key Features: With isolated springs to reduce flush rates and minimize product dilution, the AST60 is easy to rebuild on-site using standard tools, eliminating the need to wait for repairs or worry about hazardous material contamination from exchange seals. 

• Overview: The AST70 is a balanced, multiple spring seal that’s easy to install and requires no measurements. It’s ideal for ANSI pumps, split case pumps, and vertical pumps. 

• Applications: Suitable for ANSI, split case, and vertical pumps where quick, easy seal replacement is needed without pump teardown. 

• Key Features: The AST70 is field rebuildable, allowing on-site repairs with standard tools—eliminating downtime and concerns about hazardous material contamination from exchange seals. Installation is straightforward: slide the seal onto the shaft, bolt down the gland, tighten the set screws, and remove the centering blocks. The seal also allows for easy impeller adjustment without dismantling the pump. Available off-the-shelf to fit most ANSI pumps, the AST70 can also be engineered for custom applications while maintaining the convenience of off-the-shelf rebuild parts. 

• Overview: The AST80 dual mechanical seal uses liquid shear pumping to cool seal faces and operates with either a pressurized barrier or non-pressurized buffer fluid system. 

• Applications: Ideal for ANSI pumps, split case, paper stock, and positive displacement pumps, with options for custom designs for systems like progressive cavity pumps. 

• Key Features: The AST80 can function as a double seal with pressurized barrier fluid to prevent leaks, a tandem seal to reduce pressure differential, or a spare seal where the outboard seal serves as a standby. Available off-the-shelf, with rebuild parts also readily accessible.