MIL-DTL-85052B
TABLE IV. Dimensions for mandrel and clamp spacing.
Clamp
Mandrel
Clamp Spacing
Size
(see figure 1)
Dia + .001
Length + .015
A
B
(Inches)
(Inches)
(Inches)
(Inches)
-2
.125
6.000
-
-
-4
.250
17.500
6.00
2.75
-6
.375
21.000
8.00
2.50
-8
.500
23.000
9.00
2.50
-10
.625
25.000
10.00
2.50
-12
.750
29.000
12.00
2.50
-16
1.000
29.000
12.00
2.50
-20
1.250
22.500
2.75
8.50
-24
1.500
22.500
2.75
8.50
4.4.3.3.2 Vertical burn test. Three -16 clamps shall be used for the vertical burn test
(see 4.4.3.3.1). Remove the specimens one at a time from the preconditioning chamber
immediately before performing test. Slide the cushion to one end of the clamp band. Position
the specimen in the vertical position with the centerline of the cushion material 0.75 inch
above the top edge of the burner tube. Apply flame for 12 seconds and then remove. Testing
shall be performed in a draft free environment. The average burn time of the three samples
after removal of flame shall be not greater than 15 seconds. The average burn length shall be
less than the length of one of the cushion specimens. Drippings from the burning specimens
shall not continue to flame for more than five seconds after falling (see figure 2).
4.4.3.3.3 Horizontal burn test. Three specimens of any sizes fabricated in accordance
with ASTM-D3182 shall be used for the horizontal burn test. The specimens shall be removed
one at a time from the preconditioning chamber and positioned so that the centerline of the
edge being burned shall be 0.75 inch above the top edge of the burner tube. The flame shall be
applied for 15 seconds and then removed. Permit a minimum of 1.5 inches to burn to calculate
the burn rate. The burn rate shall be not greater than 2.5 inches per minute. Record burn rate
(see figure 2).
4.4.3.4 Titanium compatibility test. Mount five -16 clamps on a piece of titanium alloy
tubing conforming to SAE-AMS4944, SAE-AMS4945, or SAE-AMS4946 with no spacer
between the feet. The tubing with clamps mounted shall be filled with MIL-PRF-83282 fluid
and exposed to the clamp maximum rated service temperature as specified in the applicable
specification sheet for 12 days. Pressure in the tube shall be maintained at 3000 PSI during the
o
12-day exposure. The test apparatus shall be removed and placed in an atmosphere of 158 F
and 95 percent relative humidity for 20 days. Performance requirements shall be as specified
herein (see 3.5.1).
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