Metal Bellows Seal Application: Fuel Pump
Background
The pump for a commercial aircraft had an existing carbon face seal experiencing high leakage and seal failures. Technetics Qualiseal® Technology was employed to find a solution.
Operating Conditions
- High speed (27,000 rpm)
- Dry running (no lubrication)
- 12.5 psid
Determining Cause and Failure Modes
- Seal testing and Qualiseal® Technology FEA model indicated temperatures up to 650°F
- Current secondary seal taking a set due to high temperature
- Possible carbon resin exudation due to high temperature
Technetics Qualiseal® Technology Solution
- Designed a metal bellows seal assembly with a high-temperature carbon grade
- Sealed application and satisfied extreme temperature requirements
