You must remember to subtract volume from volume, never inches from inches. The resulting figure is at
the observed temperature and is ready to be corrected to volume at 60F. To determine the multiplier
necessary to convert the volume at observed temperature to the volume at 60F, one would need an
average tank temperature and the API gravity of the product. 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 supply unit, you must ensure that all quantity calculations and gaging records
generated by petroleum supply 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 (Quality Surveillance Handbook for Fuel, Lubricants, and Related Products), and AR 710-2
(Inventory Management Supply Policy Below the Wholesale Level).
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 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
6-11
QM 5097
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