Downloaded from https://www.everyspec.com MIL-STD-2031(SH) 30.4 between Filler insert. A noncombustible malerifil Iillcr inser[ 1/2 inch [hick shall be inserted the steel mounting plate and specimen to provide a scat from Ilre gas flow to the edges and back face of the material specimen. 40. PROCEDURE steel mounting plate so that the 16-IL! inch opening is entirely covered and is airtight. See figure 40.1 Mounting. Mount and bolt the 2- by 2-foot material specimen and filler insert to the -1 L. 40.2 TC Installation. Install eight TCs in the following locations (figure 3): a. One TC 2 inches from the center of the burner tip b.
One TC against the center of the material specimen on the fire side c. Three TCs placed vertically on the non-tire side of the material specimen along its vertical centerline. The upper and lower thermocouples should be approximately 1 inch below and above, respectively, the edge of the 16-1/2 inch opening d. One TC placed 1-1/2 inches directly behind the center thermocouple of the three vertically mounted thermocouples on the non-fire side of the material specimen e. One TC placed 4 inches 10 lhe right of the bottom TC of the three vertically mounted thermocouples on the non-fire side of the mrtterial specimen f.
One against the steel mounting plate 2 inches above the material specimen on the non- fire side. 403 the test Fire chamber. The fire chamber shall be attached to the test stand and tighten nuts on stand bolts. The propane burner tip shall be 18 inches from the material spceimeu. Burner tempemtwe. The burner and monitor shall be lit such that the temperature, as measured by the TC- on the material specimen fire side, reads approximately 1095 (2000 throughout the test. The airflow in the fire chamber shall be preset using a blank plate insert for the material specimen to obtain this temperature with the burner.
The flame shall be applied to the material specimen for not less than 1 hour or until burn-through of the material occurs as demonstrated by flame penetration to the non-fire side of the materhd speeimen. 40.4 16