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AST 80
DUAL CARTRIDGE SEAL

Brochure
Dimensional Data
Instructions

Product View

AST 80 views

Cutaway

AST 80 cutaway

Specifications

MATERIALS OF CONSTRUCTION

Metal components:    316 Stainless Steel standard; Alloy 20, Titanium, and Hastelloy C-2761 available
Inboard rotating seal ring:    Carbon-Graphite or Graphite-Loaded Sintered Silicon Carbide
Outboard rotating seal ring:    Carbon-Graphite
Stationary seal rings:    Sintered Silicon Carbide or Tungsten Carbide
Springs:    Hastelloy C-276
O-rings:    Fluoroelastomer, EPDM, Aflas2, or Isolast3 perfluoroelastomer

OPERATING LIMITS

Pressure:    400 PSIG (28 bar) maximum to 28 in (710 mm) Hg vacuum,
    depending on shaft size and speed.
Temperature:    To 500°F (260°C), depending on O-ring elastomer limits in fluid sealed

Notes: 1Trademark of Haynes International Inc., 2Trademark of Asahi Glass Co. Ltd., 3Trademark of Trelleborg Sealing Solutions

The AST 80 Seal is two mechanical seals packaged in one compact, unitized cartridge assembly for easy installation. It can be used in three ways:

Double Seal: With barrier fluid pressure higher than product pressure, the AST 80 prevents leakage of toxic or hazardous fluids into the environment. The barrier fluid provides lubrication to seal gases and non-lubricating fluids.

Tandem Seal: By using a buffer fluid with pressure lower than process, the AST 80 can reduce pressure differential across a single set of seal faces.

Spare Seal: With unpressurized buffer fluid, the outboard seal of the AST 80 runs "at idle" as a standby seal. If the inboard seal fails, the outboard seal provides primary protection, eliminating unscheduled shutdown of batch processes.

 
 

OFF THE SHELF...
AST 80 seals are available off-the-shelf to fit most ANSI pumps, including enlarged bore pumps, without modification. Seals are in stock to fit many split case, paper stock, and positive displacement pumps.

...or ENGINEERED
We design and build special AST 80 seals for progressive cavity pumps and other systems that require more than a standard seal. Rebuild parts are still off-the-shelf.