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Delta Testing

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*
Swivel-Lock style fastener with 3/8" bolt* 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
Swivel-Lock style fastener* Failure occurred at 557 cycles
Spring Tension Grating Clip* Failure occurred at 680 cycles

 

Delta Seal 3kRemarks: Report by: Ken Meyn, P.E.
Respectfully submitted, DELTA TESTING AND INSPECTION, INC.
Donald F. Meyn President

 

 

Testing Data according to Delta Testing and Inspection, Inc
*Generic grating clip names used.

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Grating Fasteners, LLC
P. O. Box 6438, New Orleans, LA 70174
Phone: (800) 227-9013 Fax: (504) 394-1454
E-mail: sales@gclips.com

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