| Whether your well is 3000 feet in depth or
30,000 feet, you have the security of knowing you have the best there
is.
The Challenger safety anchor far exceeds, in strength and soil
holding capacity, the test requirements of API, State, and Federal OSHA
proposed regulations. *
Challenger is manufactured from 100% U.S. ASTM Mill Steel and the
design backed by over 100 years experience in manufacturing,
engineering, testing, and installation. |
Square inches of
surface................................239
* Ultimate Mechanical Strength..................75,000#
Working
Load........................................60,000#
Loads based on 1 1/4" Anchor Rods when
pulled at 45
degree angle when installed in proper class soil
and depth.
* Tested by independent Testing Lab. |
|
*Soil
Classification Chart |
|
American Petroleum Institute |
|
Safe Bearing Capacity of Soils |
|
Type of Soil |
lbs / ft2 |
| Soil ledge of hard rock, such as
granite, trap, etc. |
50,000 -- 200,000 |
| Sound shale and other medium rock
requiring blasting for removal |
20,000 -- 30,000 |
| Hard pan, cemented sand and gravel
difficult to remove by picking |
16,000 -- 20,000 |
| Soft rock, disintegrated; in natural
ledge difficult to remove by picking |
10,000 -- 20,000 |
| Compact sand and gravel requiring
picking for removal |
8,000 -- 12,000 |
| Hard clay requiring picking for
removal |
8,000 -- 10,000 |
| Gravel, coarse sand in natural thick
beds |
8,000 -- 10,000 |
| Loose, medium, and coarse sand, fine
compact sand |
3,000 -- 8,000 |
| Medium clay, stiff but capable of
being spaded |
4,000 -- 8,000 |
| Fine loose sand |
2,000 -- 4,000 |
| Soft Clay |
2,000 |
| *Values
taken from Mark's Mechanical Engineer's Handbook, McGraw-Hill
Book Co, Inc., New York, Sixth Edition (1958). |
Two Critical Requirements Necessary to Have a Safe Guyline Anchor
A.) Mechanical strength and design
B.) Required square inches of surface area (displacement) in undisturbed
soil.
CHALLENGER by NATIONAL FOUNDRY & MFG.
meets these requirements by having the highest mechanical strength of
any expanding safety anchor and the largest displacement (239 square
inches).
Challenger Vs. Top Brands of
Safety Anchors
Challenger - 239 square inches less
10" hole (disturbed soil) 78.65 square inches - undisturbed soil
160,35"
Brand A - 209 square inches less 10" hole (disturbed soil) 78.65
square inches - undisturbed soil 130.35"
Brand B - 190 square inches less 10" hole (disturbed soil) 78.65
square inches - undisturbed soil 111.35"
Brand C - 156 square inches less 10" hole (disturbed soil) 78.65
square inches - undisturbed soil 77.35"
|
Challenger Anchor Product List |
|
January 21, 2004
|
| Rod Size |
Weight |
| 1 1/4" x 4' |
42# |
| 1 1/4" x 6' |
50# |
| 1 1/4" x 8' |
58# |
| 1 1/4" x 10' |
66# |
| 1 1/4" x 11' |
70# |
| 1 1/4" x 12' |
74# |
| Anchor Rods Only |
| 1 1/4" x 4' |
18# |
| 1 1/4" x 6' |
26# |
| 1 1/4" x 8' |
34# |
| 1 1/4" x 10' |
42# |
| 1 1/4" x 11' |
46# |
| 1 1/4" x 12' |
50# |
| Miscellaneous Items |
| Challenger bottom and pressure plate |
25# |
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