MIL-DTL-52031E
3.1 Design and construction. The fire extinguisher shall be designed and constructed to withstand the
strain, jar, vibrations, and other conditions incident to shipping, storage, installation, and service. The
extinguisher shall be built using a new hydrostatically tested cylinder with less than one year from date of
manufacture, all new component parts and purged with nitrogen or a vacuum drawn prior to charging.
The fire extinguisher triggering mechanism shall be designed in such a manner that it may be operated by
personnel wearing heavy work gloves or arctic mittens. All components shall be designed and so located
with respect to each other that ease of handling is assured and injury to operating personnel is not likely
to occur. The complete fire extinguisher shall consist essentially of cylinder with siphon tube, cylinder
seal assembly, head assembly with valve, and bracket. The fire extinguisher shall be charged with 2
pounds, 11 ounces to 2 pounds, 14 ounces of bromotrifluoromethane extinguishing agent, conforming to
ASTM D5632, and shall be stabilized to pressures at nominal temperatures as shown in table I with
nitrogen conforming to CID A-A-59503, Type I, class 1 or 2, Grade B. The fully charged fire extinguisher
shall weigh not more than 7 pounds, 11 ounces without the mounting bracket. The overall height of the
fire extinguisher with safety pin installed and bracket assembly shall not exceed 13-½ inches ± ½ inch.
With the safety pin removed, partial discharge of the contents and top handle in an elevated position, the
overall height of the fire extinguishers shall not exceed 14-½ inches ± ½ inch.
TABLE I. Pressure Temperature stabilization requirements.
Temperature (°F)
PSI (Min)
PSI (Nominal)
PSI (Max)
60
339
349
359
61
342
352
362
62
346
356
366
63
349
359
369
64
353
363
373
65
357
367
377
66
361
371
381
67
365
375
385
68
370
380
390
69
374
384
394
70
377
387
397
71
379
389
399
72
382
392
402
73
385
395
405
74
387
397
407
75
390
400
410
76
393
403
413
77
396
406
416
78
399
409
419
79
403
413
423
80
406
416
426
3.2 First article. Sample products shall be subjected to first article inspection in accordance with 4.2.
3.3 Material. Material shall be as specified herein. Materials not specified shall be selected by the
contractor and shall be subject to all provisions of this specification. Horns fabricated of rubber products
shall not be subjected to the test specified in 4.4.2.8.1. Horns fabricated of plastic products shall not be
subjected to the test specified in 4.4.2.8.4
3.4 Cylinder shell. The cylinder shell shall conform to Department of Transportation (DOT) regulations,
service pressure of 500 psig. The cylinder shell shall be clean and dry prior to assembly. All preservative
oil shall be completely removed in accordance with the preservative oil manufacturers procedure. The
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