cutting. See the supply line charts for each system type for recommended tube size and wall
thickness to use.
Copper tubing should never be used in lubrication systems, as it is not rated for the
pressure which can be developed in an automatic lubrication system.
Do not confuse Lincoln’s copper-coated steel tubing (62175; 62176) with copper tubing.
The copper coating on the steel tubing is to provide corrosion resistance to the steel
tubing.
Pipe
In some areas it may be more desirable or economical to use pipe. The pipe should be
thoroughly cleaned of scale. Scale can cause injectors to stick and ruin bearings. To assure
absence of scale the pipe should be flushed or pickled, oiled and capped. Pipe meeting ASTM A-
53 Grade B, ASTM A-106 Grade B or an equivalent grade of seamless steel pipe should be used.
The pipe schedules as specified in the supply line charts for each system type should be used.
Fittings should meet or exceed the pressure requirements of the system they are installed on.
Forged steel fittings are recommended. Cast malleable iron “water or gas” fittings should not be
used.
Hose
Hose may be used in supply lines. In many cases hose must be used as part of the supply line
where it must cross into a moving area of the machine. The hose must be rated to meet or
exceed maximum system pressures that will be used with the system. It must be noted, when
calculating total system requirements, hose expansion can be 40 times or more greater than
pipe or tubing when it is pressurized, depending on the hose. In applications where a single shot
pump is used, or where pumping time is critical the hose expansion should be confirmed before
designing the system.
Supply Line Layout
A lube system should always be laid out to make the most economical use of the supply line.
Excessively long lines increase the cost of the installation, require a larger diameter pipe or tube
for satisfactory venting, and demand more lubricant per lube cycle to allow for expansion. The
layout should be planned with these points in mind and the shortest runs possible from the pump
Experience with many installations has resulted in several useful and practical guidelines, which
cannot be included in a chart, but should be understood and applied when designing and
installing a system.
Guidelines for Low Pressure Oil Systems:
1. Use the same size pipe or tubing on all parts of the main supply line, including riser,
ceiling run, branch lines, and drop lines.
2. Where the main supply line has various branch lines, the branch lines can be reduced by
one pipe or tubing size, provided the supply line size is not the maximum length specified
on the Low Pressure Oil Supply Line Chart.
3. The tube or pipe between injectors on the specific machine should be determined by the
injector inlet thread size. Use corresponding size pipe or tube fitting thread size.
4. All supply and feed lines are to be supported at regular intervals in accordance with
accepted plumbing practice.
5. In general, the best system design for a machine is to combine the injectors to the best
advantage to form injector groups, and then run the supply line from the branch line to
each of the injector groups.
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