Automatic Greasing System
TriPlus Trailer
Designing a system
39
Date of
is
sue :
Sept
e
m
ber
2
012
F212157R02
4.3.6
Check the design
Before the components of the system are assembled and installed, the projected system should be
checked, by calculation, against the operating conditions it was designed for. Will it work under
the giving operating conditions?
The loss of pressure in the system may not exceed P
p
(P
p
equals 90% of the maximum operating
pressure supplied by the pump unit).
1.
Calculate the pressure loss P
v
over the distribution blocks, under the set operating conditions,
using table 2.
2.
Determine, using the greasing plan, which grease point is furthest from the pump unit.
Calculate, using table 3, the total pressure loss "P
l
" over that grease line.
3.
Determine which type of grease point is connected to this grease line. Determine the
resistance "P
s
" induced by that type of grease point (see 5.2 Points of departure).
4.
Calculate the largest, total loss of pressure "Pt" for each output port of the pump unit by
adding together the values of the pressure losses in the grease lines, distribution blocks and
at the grease point (P
t
= P
v
+ P
l
+ P
s
).
5.
Check: that P
t
< P
p
.
If the loss of pressure in the system exceeds P
p
investigate the following:
1.
Is it possible to use a grease of a lower NLGI class?
2.
Is it possible to raise the minimum operating temperature requirement?
3.
It might be necessary to redesign the system and reconsider whether:
• Its not better to omit the main distribution block.
• The layout of the system can be modified to shorten the grease lines or to reconfigure the
distribution blocks.
• Using a grease line of larger diameter to reduce pressure loss will solve the problem.
After you have redesigned the system you should always recalculate its suitability.