Maintenance Technology May 2017 - 35

LUBRICATION STRATEGIES

Put Portable
Filter Carts to Work

Ken Bannister
MEch Eng (UK)
CMRP, MLE
Contributing Editor

Don't set up a lube program without one or more of these multi-taskers.
THE ABILITY TO CONTROL
contamination is an important aspect
of any lubrication-management
program, especially where lubricant
cleanliness is concerned. A constant
supply of clean oil is essential to
lubricant life and, more important,
bearing life.
One of the most efficient and practical tools available to ensure lubricant
cleanliness is the portable filter cart.
In a typical industrial environment,
portable filter carts are used to transfer
and clean all types of lube, gear,
and hydraulic oils. The carts' three
principal applications in a lubricationmanagement program are:
S transferring oil from its original
container into a machine reservoir
S pre-filtering and cleanup of virgin
stock (new) oil in preparation for
machine use
S reconditioning and cleanup of oil
currently in service.
In addition, use of specialized filters
on the outlet side can extract any free
and emulsified water present in the oil.

Functionality
The primary function of any filter cart
is to filter fluids. A typical cart design
will employ a two-stage filtration
approach in which a gear pump is
connected to both filters. The inlet, or
suction, side is the first-stage, lowpressure side (approximately 5 psid)
designed to capture larger contaminant
particles exceeding 150 microns in size.
Oil is pumped through the inlet
filter to the second-stage, high-pressure
(approximately 25 psid) outlet (or
delivery side) filter designed to capture
much smaller particulate matter that
MAY 2017

Portable filter carts play a crucial role in equipment uptime by being able to
deliver lubricants at the right cleanliness level and transfer and clean oil while
machinery runs. (Source: EngTech Industries Inc.)

can be filtered to less than 5 microns
in size, depending on the filter rating
used.

How clean should your oil be?
Oil cleanliness is universally measured
using the ISO 4406 cleanliness code
rating system. This is a standard that
quantifies the number of contaminant
particles, 4, 6, and 14 micron in size,

that are present in a 1-ml lubricant
sample and compares them with a
particle concentration range, resulting
in an ISO-range number value.
For example, a 19/17/14 lubricant
sample value (typical of new oil)
translates to the presence of 2,500 to
5,000 particles >4 microns in size, 640
to 1,300 particles >6 microns in size,
and 80 to 160 particles >14 microns in
MAINTENANCETECHNOLOGY.COM | 35


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Table of Contents for the Digital Edition of Maintenance Technology May 2017

Maintenance Technology May 2017 - Cover1
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