Example of Volume Correction (Innage Gaging)
Tape Cut Reading:
6 feet, 3 5/8 inches
Bob Cut Reading:
0 feet, 1 1/8 inches
Tank Temperature:
67.5F
API Gravity at 60F
56.3 (JP-4)
STEP 1. Convert gage readings to gallons.
Bob cut of 0 feet, 1 1/8 inches converts to 255.6 gallons.
The tape cut of 6 feet, 3 5/8 inches converts to 17,181.4 gallons.
STEP 2. Subtract the BS&W (bob cut volume) from the total volume to get the uncorrected net volume of
the fuel.
17,181.4 gallons - 255.6 gallons = 16,925.8 gallons
STEP 3. Find the volume correction factor in ASTM Petroleum Measurement Table 6B.
Round the API gravity at 60F to the nearest 0.5 API. 56.3 rounds to 56.5.
Locate the tank temperature of 67.5F in the extreme left-hand column.
Go across from 67.5 until you are under the rounded API gravity of 56.5.
The volume correction factor is 0.9950.
STEP 4. Multiply the uncorrected net volume from step 2 (16,925.8 gallons) by the volume correction factor
in step 3 (0.9950).
16,925.8 X 0.9950 = 16,841.2
STEP 5. Round out the result to the nearest gallon and report as 16,841 gallons at 60F.
Review quantity calculations on DA Form 3853-1 and gaging records for accuracy.
As supervisor of a petroleum laboratory, you must ensure that all quantity calculations and gaging records
generated by laboratory personnel are accurate. Mistakes or oversights on quantity calculations and gaging
records could lead to the recommendation of the improper disposition of a large quantity of fuel that may or
may not be contaminated. The steps that may be taken to ensure the accuracy of calculations on DA Form
3853-1 and gaging records are as follows:
Ensure personnel are familiar with gaging procedures and cautions outlined in FM 10-67-1, MIL-HDBK-
200, and AR 710-2.
Periodically spot check the calculations and conversions against records and tables.
Assign technicians the task of checking fellow technicians' calculations and records for accuracy.
Provide continuous training for lab personnel with regard to gaging procedures.
Ensure all entries on DA Form 1358-1 are clear and legible.
Review of calculations and record information can be routinely accomplished by the laboratory supervisor or
a named, responsible individual. At minimum the following entries must be reviewed for possible
inaccuracies:
API Gravity.
Tape Reading.
Bob Reading.
Net Volume (uncorrected).
Average Temperature.
Multiplier.
Net Quantity (at 60F).
PART D - ASTM METHOD D-4057 SAMPLING PROCEDURES
Samples of petroleum and petroleum products are examined by various methods of testing for the
determination of physical and chemical characteristics. It is necessary that the samples be truly
representative of the petroleum products in question. The precautions required to ensure the representative
character of the sample are numerous and depend upon the type of material sampled, the source from which
the sample is obtained, the type and cleanliness of the sample container, and the sampling procedure that is
used. A summary of sampling procedures and their application is presented in this lesson. Each procedure
is suitable for sampling a number of specific materials under definite storage, transportation, and container
conditions. The basic principle of each procedure is to obtain a sample or a composite of several samples in
a specific manner and from specific locations in a tank or other container in order that the sample or
composite will be truly representative of the petroleum product(s) being tested.
4-10
QM 5180
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