Flowserve Pac-Seal Type 51 - Manual (Page 7)

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2.6.1 For back-first installations apply pressure to the outer
diameter of the seal. Whenever possible even pressure
should be applied to the outer diameter of the seal face,
bellows, and outer shell to provide proper installation.
Care should be taken not to apply pressure directly to
the sealing surface of the seal face to avoid any possible
damage. Press the assembly until the back side of the
spring (or spring retainer if applicable) is flush and parallel
to the equipment. Clean both rotating and stationary seal
faces with a lint free rag and isopropyl alcohol. Note: Any
oil or grease on the seal faces may cause the seal to leak.
2.7 Install spring and spring retainer (if applicable) over shoulder of
metal outer shell. Make sure spring correctly engages shoulder of
seal head and impeller shoulder or spring shaft retainer.
Type 51 and Type 52 Operational Recommendations
3.1 Remove lock outs on equipment and valves
3.2 Do not start up the pump dry to check motor rotation or for any other
reason. Open valves to flood pump with product fluid. Vent air from
the casing of the pump and the seal chamber before start-up.
3.3 Observe the start-up. If the seal runs hot or squeals do not allow the
pump to run for any extended time.
3.4 The seal is designed to resist corrosion through proper material
selection. Do not expose the seal materials of construction to
products outside of their corrosion limits. Consult Flowserve for
chemical resistance recommendations.
3.5 Do not exceed pressure and speed limits established for the seal.
3.6 Do not exceed the temperature limits of the seal based on the
materials of construction.