FED-STD-791D
Introduction
TESTING METHOD OF LUBRICANTS, LIQUID FUELS, AND RELATED PRODUCTS
1. SCOPE
1.1 This test method standard is composed of standard test methods for sampling,
inspecting and testing lubricants, liquid fuels and related products. It is issued pursuant to the
Federal Property and Administration Services Act of 1949, as amended and its application to the
purchase of commodities referred to herein is mandatory on all Federal agencies.
1.2 The test methods of this standard, when cited in a specification form an integral part
of that specification. Such a citation ,although referenced to the basic number of a method is
intended to apply to the latest version of the method as revised (see paragraph 2)and as amended
by any subsequent Change Notices to this standard
CAUTION
Change Notices are not cumulative.
Therefore all notices must be consulted to insure that the latest requirements are observed
1.3 Some methods are identical to those published by the ASTM International. These
methods are listed in the indexes together with their corresponding ASTM method numbers and
the details of such test methods are omitted from this standard.
2. NUMBERING SYSTEM
2.1 The test methods are identified by numerical designations, each consisting of a basic
number and in some instances a revision number (decimal)
a. Basic number. The basic number of a method is its official designation and should be
used without revision number whenever the method is referenced. The number always
refers to the same method of determination and the same accuracy, and the same end
results regardless of revision status.
b. Revision Number. Revision numbers appear as decimal addition to the basic numbers.
These are assigned to basic numbers when changes are made in the method to clarify it or
to give additional details that will increase the reproducibility of the test results.
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