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Which AMSOIL Products Are Recommended
For Your Vehicles?
The Rotary Screw Compressor
Market Can Be Confusing
the basics and rely on AMSOIL Technical Services for success
in the field.
Technicle Product Manager, Drivetrain
In the April 2015
issue of AMSOIL Magazine I touched on the oil requirements
and basic operation of reciprocating compressors. In this
month's issue I'd like to cover another very important type
of compressor: the oil-injected rotary screw.
Rotary screws have
been around since the early 1960s and are currently the dominant
compressor in industrial facilities. Outside of the factory,
rotary screws have gained in popularity with many commercial
operations, such as auto maintenance and body shops. They
are commonly seen at construction sites mounted on trailers
and it wouldn't be unusual to find an affordable 3 horsepower
unit in a well-equipped home shop.
To compress air,
an oil-injected rotary screw compressor relies on two intermeshed
screws mounted in a heavy steel case. This assembly is called
an air end. An electric motor turns one of the screws, which
in turn spins the other. When compressed air is required,
an intake valve above the screws opens, allowing them to grab
air and squeeze it as it moves down their length. At this
point, the compressor is producing compressed air. When air isn't
required, the compressor goes into an unloaded state by closing
the intake, allowing the screws to keep spinning without compressing
and sensors governing this process may be relatively complex, but the
parts that we're concerned about from a lubrication standpoint
are very simple. To lubricate the compressor, oil moves from
the reservoir through a filter to the bearings and onto the
screws to reduce friction between them and create an airtight
seal. Since the compressed air is in direct contact with the
oil, it travels through an air/oil separator filter to recover
the oil so it doesn't leave the compressor with the
air. Last but not least, the oil acts as a coolant, carrying
the heat generated by compressing air to an oil cooler, which
is much like a car's radiator. This is the reason you
may hear some refer to rotary screw compressor oil as coolant.
have a gauge that displays the temperature of the compressed
air as it leaves the air end. This is referred to as the discharge
temperature, and the lifespan of any rotary-screw compressor
oil is heavily influenced by it. There is no "normal"
discharge temperature, but 180°F-195°F is common.
Being substantially below this range can result in high amounts
of water remaining in the machine, causing sludge and plugged
filters. Substantially higher temperatures can shorten oil
life, and poor-quality oil in those high temperatures can
produce varnish to the point the machine won't run. As a safety
precaution, many machines will automatically shut off at approximately
230°F to avoid damage and prevent fires.
for screw-compressor oils vary widely. Mineral oils may last
from 2,000 to 4,000 hours, and some very expensive synthetics
are rated for 12,000 hours under ideal conditions. The most
widely accepted expectation for oil life is 8,000 hours. A
vast majority of screw compressors use ISO 46 non-detergent
oil, such as AMSOIL PC Series ISO 46 Synthetic Compressor
Oil (PCI), to replace hydrocarbon-based oils, or AMSOIL SIROCCO
ISO 32/46 to replace PAG (Polyalkylene Glycol)-based oil.
is used by several compressor manufacturers. There
is nothing mysterious about PAG; it is simply just another
type of oil. The important thing to remember is PAG oils aren't compatible
with any hydrocarbon-based conventional or synthetic oil,
including our PC Series ISO 46 product. Mixing them in a compressor
will at the very least require a thorough flushing with several
filter changes. Lastly, understand that there may be a requirement
for a higher or lower viscosity on occasion.
Technical Services staff helps our customers with compressor
oil recommendations every day. If you'e ever in doubt on which
oil to choose for a rotary-screw compressor, just give us
a call at (715) 399-TECH (8324). Published, AMSOIL Magazine
AMSOIL Signature Series
Synthetic Motor Oil
AMSOIL Signature Series Synthetic
Motor Oils are formulated to meet the latest API SN Resource
Conserving and ILSAC GF-5 industry specifications. AMSOIL
Signature Series Oils include 0W-20, 0W-30, 5W-30 and 10W-30
and represent the very best motor oils AMSOIL has to offer,
allowing motorists to take advantage of maximum extended
drain intervals. AMSOIL Signature Series Synthetic Motor
Oils are recommended for drain intervals of up to 25,000
miles/one year, whichever comes first (15,000 miles/one
year in severe service conditions).
here for more information
Synthetic Motor Oils offer the longest drain intervals
on the market, unsurpassed protection and performance that
effectively extends equipment life and improved fuel economy,
saving customers money at the pump and reducing the nation's
dependence on foreign oil.
The Presidents Desk
Synthetic Diesel Oil Articles and Testimonials
INC. warrants that the use of its lubricants will not cause
mechanical damage to any mechanically sound equipment when
AMSOIL INC. products are used in full compliance with the
company's recommendations and instructions."
synthetic motor oils are formulated to surpass engine test
specifications, offering protection far greater than competing
motor oils for extended drain intervals. Most synthetic oil
manufacturers make no claim to extended drain intervals, deferring
to the maintenance schedule provided by the vehicle manufacturer.
With its unparalleled oil and warranty program, AMSOIL offers
consumers unprecedented protection and economics.
More than 20 years
ago, AMSOIL began using the NOACK volatility test as a comparison
tool and measurement of quality. Back then, nearly every oil
tested side-by-side with AMSOIL synthetic motor oils failed,
and those that passed barely squeaked by. Other oil companies
paid no attention to NOACK results until Ford Motor Company
made it a requirement for service fill oils, validating what
AMSOIL had said all along.
NOACK Volatility Test
Volatility Test determines the evaporation loss
of lubricants in high temperature service. The more
motor oils vaporize, the thicker and heavier they become,
contributing to poor circulation, reduced fuel economy
and increased oil consumption, wear and emissions. AMSOIL
Synthetic Motor Oil resists high temperature volatization
better than other motor oils. AMSOIL Synthetic Motor
Oil maintains peak fuel efficiency and reduces oil consumption
AMSOIL Now An ISO Certified
received ISO 9001:2000 certification of our Quality Management
System (QMS). NSF International Strategic Registrations is
the registrar that has verified our QMS meets the requirements
of the ISO 9001:2000 standard, the most widely utilized quality
standard throughout the world for quality management systems.
ISO standards are used by over 300,000 companies worldwide
setting rigorous standards for businesses, government and
is applicable to any manufacturing and service organization
providing a framework for system development that focuses
on the customer, quality system performance and ongoing improvement.
AMSOIL received ISO 9001:2000 registration under the scope:
synthetic lubricants blending, packaging, and other fulfillment
directly associated with lubricant product.
certification puts AMSOIL in line with some of the most efficient
companies in the world. It is further assurance that the products
and services AMSOIL provides will continue to maintain the
high level of quality the company always demanded.
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