Mixer Seal failure analysis

Mixer Seal Repair

3.937″ double mixer seal sent in to Robco’s repair facility for failure analysis & overhaul. Seal had Carbon faces, Silicon seats & Kalrez high temp. o’rings. After completing failure analysis Robco had new springs fabricated that supplied 25% less loading onto the seal faces. The seal failed due to a combination of too much spring tension coupled with the high system operating pressure (600 psig). New Silicon seal seats were fabricated & new Carbon seal faces machined. Mechanical seal was repaired & pressure tested to 100 psig.