Page 365 - The Tribology Handbook
P. 365
Circulation systems C18
A circulation system is defined as an oil system in which the oil is returned to the reservoir for re-use. There are
two groups of systems: group I, lubrication with negligible heat removal; and group 2, lubrication and cooling.
GROUP 1 SYSTEMS
Virtually any form of mechanically or electrically driven pump may be used, including piston, plunger, multiplunger,
gear, vane, peristaltic, etc. The systems are comparatively simple in design and with low outputs. Various metering devices
may be used.
Multiplunger pump systems
These systems utilise the plunger-type oil lubricators of the rising or falling drop type, employing a separate pumping
element for each feed, giving individual adjustment and a positive feed to each lubrication point. Generally, the
lubricators have up to some 32 outlets with the discharges being adjustable from zero to maximum.
DELIVERY LINES
1111
LUB. POINTS 1
connecting pipework
OR ELECTRICAL
DRIVE ---+
MAIN SUPPLY
TO HEADER TANK
SUPPLY TO MULTI-
PLUNGER PUMPS
Figure 18.3 Extensive sys-
tem for large numbers of
bearings, using multi-point
lubricator s ystem can be ex-
MU LTIPLUNGER tended within the limitation
of the gravity feed from the
header tanks
Typical applications
Paper machines, large kilns, calenders, and genera1 machinery with a large number of bearings requiring a positive feed
with feed adjustment.
C18.1
