Downloaded from https://www.everyspec.com MIL-STD-81OD 19 ‘July 1983 APPENDIX f! METHOD 511.2 EXPLOSIVE ATMOSPHERE ., CHAMBER, PLAMMABLE ATMOSPHERE TESTING A-1 This appendix describes one.test chamber capable of producing the flammable atmosphere conditions required for this test method. . . A-1.1 Comooneritoarts. The facility shall consist preferably of a steel test , chamber and associated pumps, ignition system, fuel metering system, power source, and.any other equipment necessary to meet the””requirements for test method 511.2 for flammable atmosphere,testing. !.. ,, A-1.2, QQS@I and constructio~. The explosive atmosphere testing facility ,.
shall.be a portable self-contained unit.or a permanent iflStaUatiOn consisting of a well-lighted test chamber equipped with .a’system”for mixing and circulation of exploeive air-fuel vapor mixtures, a means of ignition of air-vapor mixture, an explosion relief valve system (figure Al is a drawing of a differential pressure explosion-relief valve), and a vacuum pump to permit the simulation of altitude. Adequate controls and instrumentation shall be provided. The facility shall be assembled on a chassis or frame and could be mounted on pneumatic-tired wheels for portability...
The design-may c“onformin general to figure A2 and”shall be capable of compliance‘withthe requirements ~f this metho~. ,! .. . A-1.2.1 ~. A practically ;ized test chamber should provide,a minimum a clear working space 3 feet in diameter and 5 feet long and should be capable of maintaining any desired pressure altitude within perfcu.mancelimits specified in paragraph A-1.3.5 below. A-1.2.1.1 The chamber shall have pressure relief valves and shall be capable of conformance with the applicable requirements of A-1.3 below.
Pressure-tight jacks for transmission of power to and from the test item shall be provided, together with openings for the insertion of sealed mechanical controls, as required. Observation windows shall be provided in both sidea of the chamber. A-1.2.1.2 EIA?Qc. A removable floor, having a minimum area of 0.75 square meter ‘(8 square feet) and capable of supporting 488o kilograms per square meter (100 pounds per square foot) within the chamber. . A-1.2.1.3 ~. The test chamber shall be lighted ‘withtwo 150-watt lamps of explosion-proof design, one located at each end of the chamber, to provide uniform illumination.
9 A-1.2.1.4 S.fx.ffinxboxa Two stuffing boxes shall be provided to facilitate the penetration of cabling connectors and control shafts. FfSTHOD511.2 APPENDIx A 19 July 1983 511.2-10