Graphalloy wear rings and bushings
from Graphite Metallizing
Corporation are said to
provide
performance
that is superior to
standard metal stationary and
rotating wear parts in pumps for CO2
service in oil field applications. Selflubricating
Graphalloy, a
graphite/metal alloy, eliminates
concern about bearing failures or
possible flashing of CO2.

The ability to operate without
additional lubrication is important in
CO2 injection applications because
CO2 has low lubricity. Standard metal
wear parts rely on the lubricity of the
liquid being pumped for
proper operation so they
are prone to failures in
pumps used to inject CO2. In
addition, due to high suction pressure
required to keep CO2 as a dense
phase liquid, flashing is always a
possibility.