ASTM D7718-11

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Designation: D7718 − 11
Standard Practice for
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Obtaining In-Service Samples of Lubricating Grease
This standard is issued under the fixed designation D7718; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
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1. Scope 2.2 ANSI/ASME Standard:
B1.20.1 Pipe Threads, General Purpose (Inch)
1.1 This practice covers the method to obtain a trendable
in-service lubricating grease sample from the following con-
3. Terminology
figurations including motor-operated valves, gearboxes,
pillow-block bearings, electric motors, exposed bearings, open 3.1 Definitions:
gears, or failed grease-lubricated components.
3.1.1 active grease-sampling device, n—device designed to
take an active sample of a lubricating grease from a bearing,
1.2 Insomecases,itmaybenecessarytotakemorethanone
gear, or drive shaft located in a grease-lubricated component.
sample from a piece of equipment to obtain more trendable
results. Examples of this could be a large bearing that does not
3.1.2 active sampling, v—to use a sampling device to
fully rotate, such as a slew bearing, or one in which sufficient
actively gather an in-service lubricating grease sample from a
mixing does not otherwise occur.
grease-lubricated component.
1.3 Samples taken in the above manner may need to be
3.1.3 actuate, v—to hold the interior cylinder of the active
mixed to form a more homogeneous sample. This may also be
grease-sampling device while pushing the exterior cylinder
true of other samples such as those taken from open face
forward toward the grease-lubricated component that is being
bearings.
sampledallowinglubricatinggreasetofillthesamplingdevice.
1.4 The values stated in SI units are to be regarded as the
3.1.4 extension rod, n—tool used to extend the depth at
standard. The values given in parentheses are for information
which a sample is taken with an active grease-sampling device.
only.TheexceptiontothisisastandardEnglishunitsthreadfor
3.1.4.1 Discussion—The extension rod may also be used to
which there is no metric equivalent.
remotely actuate an active grease-sampling device.
NOTE1—Thestandardpipethreadreferredtoisthenationalpipethread
3.1.5 in-service lubricating grease, n—lubricating grease
tapered thread.
that has been applied as a lubricant to a gear, bearing, or drive
1.5 This standard does not purport to address all of the
screw for any period of time.
safety concerns, if any, associated with its use. It is the
3.1.6 lubricating grease, n—semi-fluid to solid product of a
responsibility of the user of this standard to establish appro-
dispersion of a thickener in a liquid lubricant.
priate safety and health practices and determine the applica-
3.1.6.1 Discussion—The dispersion of the thickener forms a
bility of regulatory limitations prior to use.
two-phase system and immobilizes the liquid lubricant by
surface tension and other physical forces. Other ingredients are
2. Referenced Documents
commonly included to impart special properties. D217
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2.1 ASTM Standards:
3.1.7 passive grease-sampling device, n—device designed
D217 Test Methods for Cone Penetration of Lubricating
to gather a sample from the equipment by being attached to the
Grease
grease reservoir at the purge point.
D4057 Practice for Manual Sampling of Petroleum and
3.1.7.1 Discussion—This device has also been designed to
Petroleum Products
contain a lubricating grease sample that has been gathered with
other methods.
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This practice is under the jurisdiction of ASTM Committee D02 on Petroleum
3.1.8 passive sampling, v—to use a passive grease-sampling
Products, Liquid Fuels, and Lubricants and is the direct responsibility of Subcom-
device to collect a purged sample of in-service lubricating
mittee D02.96.04 on Guidelines for In-Services Lubricants Analysis.
grease from a purge path.
Current edition approved May 1, 2011. Published May 2011. DOI:10.1520/
D7718-11.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
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D7718 − 11
3.1.9 trendable, adj—sample of in-service lubricating 5.2 Sampling Devices—The sampling devices for each pro-
grease used to trend the physical properties, wear levels, and c
...