Rotary shaft seals for Cement & Gypsum.
Cement, lime, and gypsum kill seals through abrasion. Fly ash is hard enough to score 316 stainless. Hot kiln dust thermally cycles every component. The best seal in this service is the one engineered for the abuse, not adapted from food or chemical service.
01The challenge
Why sealing this service is hard.
These are the failure modes our application engineers have catalogued from twenty-five years of cement & gypsum installations. Most are visible only after a seal has been pulled.
- 01
Abrasive wear from fly ash and kiln dust
Fly ash particle hardness exceeds standard stainless. Tungsten carbide faces last roughly five times longer in this service — we spec them standard on the 7500-AB and 9700-WC.
- 02
Thermal cycling on kiln-area equipment
Equipment near the kiln cycles from ambient to 400 °F daily. Cast housings crack at the welds; bar-stock 316L tolerates the cycling indefinitely.
- 03
Trapped shafts on bucket elevators
Cement-plant bucket-elevator head shafts are typically welded between two bearings. Pulling a bearing for a seal change is a multi-day shutdown. The Split Seal solves this — three-hour field install on a trapped shaft.
- 04
Pneumatic conveying transfer
Dilute-phase pneumatic transfer of cement, lime, and fly ash requires sealing at the rotary airlock under positive pressure with abrasive media on both sides. The 7500-AB is the standard recommendation.
02Recommended series
What we ship for cement & gypsum.
03Common equipment
Where we typically install in cement & gypsum plants.
04Compliance & materials
Documentation we ship with the seal.
- Tungsten-carbide face options for high-abrasion service
- High-temperature elastomer compounds rated to 500 °F
- Field-retrofittable to CEMA 300 / 350 / 400 stuffing boxes
- Custom split housings up to 14-inch shaft for trapped applications
05Engineering FAQ
What plant engineers ask before specifying.
Cement & Gypsum · sized in 24 hours
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