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AST 80M
DUAL CARTRIDGE SEAL FOR MIXERS

Brochure
Dimensional Data
Instructions

Product View

AST 80M views

Cutaway

AST 80M 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 80M Seal is a rugged dual cartridge mechanical seal built for use in mixers, agitators, double-ended pumps, and other rotating equipment in demanding service.  With its large internal clearances, the AST 80M tolerates shaft runout and end play that would make another seal fail.

The hydraulic double balance of the AST 80M means it can be used in three ways:

Double Seal: With barrier fluid pressure higher than product pressure, the AST 80M prevents leakage of hazardous fluids into the environment. The barrier fluid provides lubrication for the seal in top-entry mixers.

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

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