|
| |
4-3.1 Meter-Strainer Assemblies - Contd.
CAUTION
PURGING AIR THROUGH METER STRAINER ASSEMBLY
The positive displacement meter cannot be subjected to any substantial airflow without running the risk of overspeeding
and ruining the water. Special care must be taken during purge and fill operations.
4-3.2 Range Poles
a.
Range poles are installed at each 5000 Bbl fabric collapsible tank as described in Fig. 2-23 and para. 2-4.9.
While this is far from an accurate measurement, it is useful and will help prevent overfilling if observed. They can be
used as a check and backup for metered movements and in the resolution of inventory problems. The tanks have not
been strapped as would be the case with a standard metal tank. The height of the tank does not vary in a direct linear
way with its content. However, when the tank is full, it will always be at the same height unless it has been damaged or
distorted for some reason. When it is half full, it will be approximately one half (1/2) its full height. If the range poles are
installed as suggested in this manual, the following procedures apply.
1.
The height of a 5,000 bbl tank is specified to be 6 ft. 8 in. when it contains 5,000 bbl. The tank top should be
touching the cord between the two range poles.
2.
If the tank top is 3 ft. 4 in. below the cord, the tank contains approximately 2,500 bbl.
3.
If the tank is 3 ft. 4 in. high at the beginning of a transfer and 2 ft. 4 in. high at the end of a transfer,
approximately 750 bbl have been moved out, i.e., approximately 750 bbl per ft. of height change.
b.
The accuracy of the above guideline can be checked and modified in the field by metering a known amount into
the tank and checking against the actual change in elevation.
c.
The position of and the tightness of the cord between the range poles should be checked routinely to assure that
it is located 6 ft. 8 in. above the tank bottom (or some other fixed height specified by operating management).
4-4 Operating Records
4-4.1 General
It is not within the scope of this manual to detail the extent or form of operating records desired by the U.S. Army. The
reader should refer to U.S. Army instructional manuals which include:
FM 10-69
Petroleum Supply Point
Equipment and Operations
FM 10-18
Petroleum Terminal and Pipeline Operation
4-8
|
