Test Report
Demonstrating the Effectiveness of the OOT G-21
Detonator Interrupter
October 24, 1996
Prepared for U.S. Bureau of Mines
by David W. Boston
Filename: D:\Data\APRV\OOT\032\US\USBM TEST REPORT.WPD
Table of Contents
Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Testing Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Test Date, Location, Supervision . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Additional Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Drawing GUN-ASSY-002-02 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
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Purpose
Tests were conducted to demonstrate the effectiveness of the Owen Oil Tools, Inc. G-21 detonator
interrupter in preventing detonating cord initiation in select-fire perforating gun systems.
Background
On August 20, 1996, Owen Compliance Services, Inc., on behalf of its client Owen Oil Tools, Inc.,
applied to the U.S. Bureau of Mines for examination and classification of the OOT Select-fire
Perforating Gun System pursuant to the requirements of the U.S. Department of Transportation. This
system is a fully assembled perforating gun system consisting of several carrier sections each containing
one perforator, one length of detonating cord, and one G-21 electric detonator. A detonator interrupter is
present during transport of the system from assembly site to job site to prevent accidental detonation of
the perforating gun. Full details are provided in the August 20, 1996 application.
Testing Required
Per pre-application consultation with DOT, it was determined that tests were required to prove that the
detonator interrupter prevents initiation of the detonating cord by the detonator. DOT specified that this
test should be performed 5 times and should be conducted or witnessed by an agency listed in 49 CFR
173.56. OCS requested USBM send a representative to Fort Worth, Texas to witness tests to be
performed at the OOT Silverstone Load Plant.
Test Date, Location, Supervision
The tests described in this report were conducted at the OOT Silverstone Load Plant in Godley, TX on
October 14, 1996. The following persons participated in these tests:
Denver Cress (OOT):
Johnny Joslin (OOT):
T.S. Bajpayee (USBM):
Jean Finch (OOT):
Jim Rollins (OOT):
operator
supervisor, technical adviser, photographer, video camera operator
witness
transportation
transportation
Test Report, Demonstrating the Effectiveness of the OOT G-21 Detonator Interrupter
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Procedure
The following describes the procedure used to conduct the test:
1.
Assemble the G-21/interrupter/detonating cord assembly (test assembly) as depicted in drawing
GUN-ASSY-002-02 (see Appendix and figures 1, 2, 5, 7, and 10).
2.
Check shooting line to ensure circuit is safe.
3.
Connect detonator lead wires to shooting line.
4.
Place test assembly in perforating gun section, extend lead wires out end, and seal end.
5.
Place perforating gun section into test tank.
6.
Clear test area and proceed to shooting station.
7.
Ensure test area is clear and secured. Sound warning.
8.
Fire perforating gun.
9.
Return to test area, remove, and inspect gun.
10.
Disassemble gun and recover internal parts. Confirm that detonator did not initiate detonating
cord. Record results (see figures 3, 4, 5, 8, 9, and 11).
11.
Repeat steps 1 - 10 four times for a total of 5 trials.
Results
In each trial, the entire length of uninitiated detonating cord was retrieved.
Additional Testing
To demonstrate that the G-21 detonator will initiate the detonating cord, an additional test was
performed. The G-21 was affixed to the detonating cord, without an interrupter (see figure 12). The
loose end of detonating cord was taped to a metal witness strip. The test assembly was then placed in the
test tank and fired. When retrieved, the metal strip bore an impression where the detonating cord had
initiated (see figure 13), thus proving that, without an interrupter in place, the G-21 detonator will initiate
the detonating cord.
Test Report, Demonstrating the Effectiveness of the OOT G-21 Detonator Interrupter
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Documentation
Photographs were made by OOT and are reproduced herein as figures 1-13. Photographic prints and
scanned images of figures 1-13 have been provided to USBM. Additional photographs were made by
T.S. Bajpayee. A video tape of the entire test was prepared and a duplicate has been provided to USBM.
Conclusion
The OOT interrupter successfully prevents the G-21 detonator from initiating the detonating cord to
which it is affixed.
Test Report, Demonstrating the Effectiveness of the OOT G-21 Detonator Interrupter
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Figures
Figure 1
Trial #1 test assembly before test
Figure 2
Trial #1 test assembly before test
Test Report, Demonstrating the Effectiveness of the OOT G-21 Detonator Interrupter
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FIGURE 3
Trial #1 recovered detonating cord (l) & interrupter (r)
Figure 4
Trial #1 (l) and Trial #2 (r) recovered components
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Figure 5
Trial #3 test assembly before test (r) (Trial #2 components are shown at left)
Figure 6
Trial #3 recovered components (r), Trial #2 recovered components (l)
Test Report, Demonstrating the Effectiveness of the OOT G-21 Detonator Interrupter
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Figure 7
Trial #4 test assembly before test
Figure 8
T.S. Bajpayee (USBM) photographing Trial #4 recovered components
Test Report, Demonstrating the Effectiveness of the OOT G-21 Detonator Interrupter
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Figure 9
Trail #4 recovered components
Figure 10
Trail #5 test assembly before test
Test Report, Demonstrating the Effectiveness of the OOT G-21 Detonator Interrupter
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Figure 11
Recovered components from Trials 1 -5 (l - r)
Test Report, Demonstrating the Effectiveness of the OOT G-21 Detonator Interrupter
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Figure 12
Set up for “Additional Test” to demonstrate that G-21 does initiate detcord when interrupter is absent
Figure 13
Witness strip after “Additional Test” shot. Impression at left proves detcord fired
Test Report, Demonstrating the Effectiveness of the OOT G-21 Detonator Interrupter
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Appendix
Test Report, Demonstrating the Effectiveness of the OOT G-21 Detonator Interrupter
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