MIL-STD-2042-6B(SH)
1. SCOPE.
METHOD 6H1
BOF CABLE BALL BEARING TEST
1.1 Scope. This method describes a procedure for performing a ball bearing test on BOF cables. This method is performed to verify that the BOF tubes are free of obstructions that would inhibit BOF fiber or BOF bundle installation.
2. REQUIRED EQUIPMENT AND MATERIALS.
2.1 The equipment and materials in table 6H1-I shall be used to perform this procedure.
TABLE 6H1-I. Equipment and materials.
|
Description |
Quantity |
Safety glasses |
1 |
Projectile trap (Kitco 0745-2140 or equal) |
1 |
Pressure source |
As required |
BB with diameter of 4.5 or 5.0 mm (0.17 in or 0.20 in) |
As required |
NOTE: Use a BB with a 4.5 mm (.17 in) diameter for individual BOF fiber installations. Use a BB with a 5.0 mm (0.20 in) diameter for bundle BOF fiber installations.
3. PROCEDURE.
3.1 Safety summary. The following safety precautions shall be observed:
a. Safety glasses shall be worn when blowing a BB.
b. Observe warnings and cautions on equipment and materials.
c. Never look into the end of a BOF tube. Always wear approved safety glasses when handling BOF tubes that may be connected to a pressure source.
d. Do not exceed 1032 kPa (150 PSI) within the BOF tube when attempting to dislodge a stuck BB. BOF tube damage can occur at pressures greater than
150 PSI.
3.2 Procedure.
Step 1 - Establish communications between the personnel at the two ends of the cable using available communication equipment.
Step 2 - Install the projectile trap on the remote end of the first BOF tube to be tested.
Step 3 - Verify that the projectile trap is installed on the correct tube.
6H1-1
METHOD 6H1
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