Groeneveld OnePlus - Check the Design

Designing a system24
Date of issue: October 2011
Automatic Greasing System OnePlus
EG1605R01
3.3.6 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 maxi-
mum operating pressure supplied by the pump unit).
1. Calculate the pressure loss P
v over the distribution blocks, under the set oper-
ating 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. Deter-
mine 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 by utilising a pump unit
with more grease output ports.
• 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.