Downloaded from https://www.everyspec.com ) Step 3 - MIL-STD-81OC Knowing fuel temperatures and specific gravity at 16° C (61”F) use figure 511.1-2 to determine specific gravity at given temperature. Step 4 - U5ing figure s11.I-3, obtain correction factor K for the specific gravity determined during step 3. Apply factor to obtain weight of fuel corrected (WFC). WFC = KWFu = 1.01 x 0.116 = 0.117 lbs, fuel weight (corrected).
The equipment used to vaporize the fuel for use in the explosion-prooftest should be so designed that a small quantity of air and”fuel vapor will be heated together to a temperature such that the fuel vapor tii11 not condense as it is drawn from the vaporizer into the chamber. 3. PROCEDURES 3.1 Procedure I 3.1.1 Preparation for test a. The test item shal1 be prepared in accordance with General Requirements, 3.2, and in such a manner that normal electrical operation is possible and mechanical controls may be operated through“thepressure seals from the exterior of the chamber.
External covers of the test item shall be removed or loosened to facilitate the penetration of the explosive mixture., Large test items may be tested one or more units at a time by extending electri- cal connections through the cable port to the balance of the associated equipment located externalIy. ) b. The test item shall be operated to determine that it is functioning properly and to observe the location of any sparking or high temperature components which may constitute potential explosion hazards. c.
Mechanical loads on drive assemblies and servomechanicaland electri- cal loads on switches and relays may be simulated when necessary if proper precaution is given to duplicating the normal load in respect to torque, voltage, current, inductive reactance, etc. In all instances, it shall be considered preferable to operate the test item as it normally functions in the system during service use. 3.1.2 Performance of test. Except as specified below, the test shall be conducted as follows at simulated test altitudes of sea level to 5,000 feet, 10,OOO feet, ls,000 feet (ls,000 feet maximum for grOund equipment) 20,000 feet, 30,000 feet, 40,000 feet, and 50,000 feet above sea level:
511.1-3 METHOD 511.1