FEATURE
HETG HEES HEPG HEPR Standard Petroleum
CONTINUED ON PAGE 31
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Table 1
soybean oil. They offer a high viscosity index, very good wear
properties and are compatible with most seals and hoses.
Synthetic Esters (HEES)
Esters are synthesized by the reaction of an alcohol with an
acid to form an ester. This reaction process allows for the
flexibility to customize the type of ester used for a particular
application. They deliver high performance, good thermal
and oxidation stability and extended fluid life.
Polyalkylene Glycols (HEPG)
Made of synthetic, petroleum-based oil, HEPGs are created
by the polymerization of ethylene or propylene oxide. This
option offers excellent high- and low-temperature viscosity
performance and fire-resistant properties.
Polyalphaolefins (PAOs) and related
hydrocarbon products (HEPR)
Often referred to as classic mineral oil-based lubricants,
HEPRs are synthesized hydrocarbons derived from crude
oil meant to provide a low-viscosity base oil that is readily
biodegradable. They are highly durable, offer extended wear
protection and excellent thermal stability, seal compatibility
and temperature range performance.
Choosing the appropriate EAL for pile driving
equipment
When evaluating an EAL, it’s important to factor in the enduser
application, the job it will be performing and how the
oil will be monitored or maintained. Consider the following
factors when choosing an EAL:
• Operating temperature
• Operating pressure
• Seal type
• Likelihood of water ingress
• Fluid life required
• Preventative maintenance cycle
• Risk of leak or spill
• Customer choice
Compare EAL attributes and then make your choice
As you hone in on the EAL that best suits your needs, it may
be helpful to see how EALs stack up against each other (see
Table 1).
Best practices for success with EALs
Determining which EAL option best meets your application
needs is the first step. In order to reach optimum performance
Readily
Biodegradable Yes Yes Yes Yes No
Ecotoxicity Low Low Low* Low High
Bioaccumulation
Potential No No No No Yes
Sheen No No No No Yes
Seal Compatibility Good Good Poor Good Good
Wear Performance Very Good Very Good Very Good Very Good Very Good
Oxidation
Performance Poor Good Very Good Very Good Very Good
Low Temperature
Performance Poor Very Good Very Good Very Good Poor
Viscosity Index Very Good Very Good Very Good Very Good Poor
*SOLUBILITY MAY INCREASE THE TOXICITY OF SOME PAGS
PILING CANADA 29
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