UFC 3-570-06
JANUARY 31 2003
APPENDIX A PART 2
INSTRUCTIONS FOR COMPLETING AIR FORCE FORM 491
1.
Entries on AF Form 491 must be made on a monthly basis.
2. No readings of the structure-to-soil potentials are to be
taken where the electrode is in contact with frozen ground.
3. Readings are to be made with the authorized meters only (see
note under item 10 of instructions).
Item 1. Installations. Enter the official name and location of
the installation as: ROBINS AFB, GA. Do not abbreviate or use
unit designations.
Item 2. Year.
Enter the calendar year.
Item 3. Protected Structure. Enter the name of the protected
structure and its number as shown on USAF Real Property Report
(RCS: HAF-PRES(SA)7115) as "Water Tank 603" or "Gas piping system
family housing."
Item 4. Rectifier Number. Enter the number of the rectifier as
assigned by the corrosion engineer. Number are consecutive
starting with number 1 and are conspicuously shown on the
rectifier.
Item 5. Rectifier Data. (from nameplate).
A. Manufacturer: Enter full name and address of
manufacturer.
B. Model Number: Enter model number as shown on
nameplate.
C. Serial Number: Enter serial number as shown on
nameplate.
D. AC Rated Capacity: Enter AC voltage and phase.
E. DC Rated Capacity: Enter DC voltage and amperage.
F. Date Installed: Enter date installed. This infor-
mation is to be obtained from the base corrosion engineer.
Where no detailed information is available, estimate and enter
approximate date.
Item 6. Ground Bed Data:
A. Anode Material. Enter the name of the material and
alloy designation, if known, as "graphite," "aluminum 3003," or
"high-silicon cast iron."
B. Size of Anode. Enter the dimensions or the standard
size designation as 1" x 60", or 3" x 60".
A-13
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