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DELTA TESTING AND INSPECTION INC.
725 S. GENOIS STREET
NEW ORLEANS, LA. 70119
PHONE (504) 486-5595
FAX (504) 486-5598
Report No. I May 31, 2000
DNO 13994
DESCRIPTION
Performance Testing of Grating Fasteners
FOR and REPORTED TO
Grating Fasteners, LLC
P. O. Box 6438
New Orleans, LA 70174
Purpose of Report: The testing services listed
herein were conducted in an effort to quantify the performance
of several different types of grating fasteners from several
different manufactures.
Method of Testing: Three (3) different types
of tests were conducted during this reporting period- One of
the series of tests employed the use of a National Institute
of Standards calibrated torque wrench to tighten the fasteners
until a failed condition occurred. The second test that was
conducted involved using a National Institute of Standards traceable
calibrated hydraulic ram set in an effort to determine at what
force would a failure of the fastener occur. The third series
of tests involved the use of a shaker table.
The testing was conducted by and or witnessed
by our Staff Engineer Mr. Ken Meyn, P.E. The testing was conducted
at the office of Grating Fasteners Inc., Belle Chasse, LA.
Testing Results: Test Series 1
First, each fastener was tightened
with a calibrated torque wrench to an installation torque of
55 inch-pounds. For the purpose of this testing, this was considered
a "hand snug tight" condition. Using a calibrated hydraulic
ram set and caliper, each fastener was tested until a failed
condition was achieved. Failure is defined as the maximum amount
of load the fastener will hold. Unless otherwise noted, all
bolts used are 1/4 inch - 20 grade 2 ASTM A 307. Deflection
is the measured separation of the grating from the support beam.
The results are an average of two series of tests for each fastener.
| Type
Fastener |
Deflection
at Failure |
Ram
Pressure |
| F-10 Galvanized Saddle Clip |
0. 15 5 inch |
925 pounds |
| SSGT-W G Clip saddle |
0. 145 inch |
1,200 pounds |
| GT-W Galvanized Clip (G-Clip) |
0.080 inch |
1,500 pounds* |
| Grate Fast 3-D Galvanized |
0.221 inch |
700 pounds |
| WGG- 1 A Assembly |
0.099 inch |
1,200 pounds |
| *Note: Clip did not fail,
held maximum ram pressure. |
Testing Results: Test Series 2
First, each fastener was tightened with the
calibrated torque wrench to an installation torque of 55 inch-pounds
"hand snug tight" condition. Using the torque wrench and caliper,
the torque was increased until a Wed. condition was achieved.
Unless otherwise noted, all bolts used are 1/4 inch - 20 grade
2 ASTM A 307. Failure is defined as the point beyond which further
use would not be possible.
| Type Fastener |
Deflection
at Failure |
Max. Torque
Held |
|
F-10 Galvanized Saddle Clip
* Clip bent to a condition where the socket could not
be placed on nut
|
0.150 inch |
85 inch-pounds* |
| SSGT-W G-Clip (top
only) |
0.057 inch |
115 inch-pounds |
|
GT-W Galvanized Clip (G-Clip top only)
* Clip did not fail, bolt stripped.
|
0.025 inch |
175 inch-pounds |
XSSGG-1
Assembly
* Clip did not fail, bolt stripped. |
0.025
inch* |
160 inch-pounds
|
Testing Results: Test Series 3 - Shaker
Table
The shaker table testing device has a 1 inch
stroke (1/2 inch in two opposite directions). The cycle is variable
from 0 to 1000. The fastened grating section tested weighs 56
pounds which is equivalent to an 8 sq. ft. of standard steel
grating. Each fastener was tightened with the calibrated torque
wrench to an installation torque of 55 inch-pounds "'hand, snug
tight" condition, The cycle of the. shaker table was slowly-
increased from 0 to 1000 or a failed condition was observed.
A failed condition is defined as the point at which the grating
loosened or became detached from the shaker table. Maximum cycles
held for 1 minute test duration.
| Type
Fastener |
Result
of Test |
|
WGG-1
|
Fastener held 1000 cycles, no failure
noted |
| RGG-1 |
Fastener held 1000 cycles, no failure
noted |
|
RSSGG-1
|
Fastener held 1000 cycles, no failure
noted |
| WSSGG- 1 (Ears over bars) |
Fastener held 1000 cycles, no failure
noted |
| WSSGG- 1 (Ears between bars) |
Fastener held 1000 cycles, no failure
noted |
| XSSGG1- 1 |
Fastener held 1000 cycles, no failure
noted |
| WSSGF -1 |
Fastener held 1000 cycles, no failure
noted |
| WGC-1 |
Fastener held 1000 cycles, no failure
noted |
Struct-Fast Galv. Model 3D
Single panel hold down |
Failure occurred at 557 cycles |
| EPI Grate Fast |
Failure occurred at 680 cycles |
 Remarks:
Report by: Ken Meyn, P.E.
Respectfully submitted, DELTA TESTING AND INSPECTION, INC.
Donald F. Meyn President
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