Figure 8 - Propane Burner Stop 741
(6) Leave the burner in position for 15 seconds and then remove to a position at least 2-inches (51 mm) above the specimen.
(g) Report.
(1) Identify and describe the test specimen.
(2) Report any shrinkage or melting of the test specimen.
(3) Report the flame propagation distance. If this distance is less than 2-inches, report this as a pass (no measurement required).
(4) Report the after-flame time.
(h) Requirements.
(1) There must be no flame propagation beyond 2-inches (51 mm) to the left of the centerline of the pilot flame application.
(2) The flame time after removal of the pilot burner may not exceed 3 seconds on any specimen.] 1195 – 1200. [RESERVED]
743 1201. APPENDIX F, PART VII, DID NOT EXIST PRIOR TO AMENDMENT 25-111.
1202. APPENDIX F, AMENDMENT 25-111, Effective September 2, 2003. This amendment added Part VII.
[PART VII-TEST METHOD TO DETERMINE THE BURNTHROUGH RESISTANCE OF THERMAL/ACOUSTIC INSULATION MATERIALS.] [Use the following test method to evaluate the burnthrough resistance characteristics of aircraft thermal/acoustic insulation materials when exposed to a high intensity open flame.
(a) Definitions.
Burnthrough time means the time, in seconds, for the burner flame to penetrate the test specimen, and/or the time required for the heat flux to reach 2.0 Btu/ft2 sec (2.27 W/cm2) on the inboard side, at a distance of 12-inches (30.5 cm) from the front surface of the insulation blanket test frame, whichever is sooner. The burnthrough time is measured at the inboard side of each of the insulation blanket specimens.
Insulation blanket specimen means one of two specimens positioned in either side of the test rig, at an angle of 30 degree with respect to vertical.
Specimen set means two insulation blanket specimens. Both specimens must represent the same production insulation blanket construction and materials, proportioned to correspond to the specimen size.
(b) Apparatus.
(1) The arrangement of the test apparatus is shown in figures 1 and 2 and must include the capability of swinging the burner away from the test specimen during warm-up.
Detail A 125" (1219 mm) Detail A (127 mra) (32 mm) (127 mm) 36" (914 mm) 34" (864 mm) 107 moly (203 mm) Detail B 24"° (610 mm) All Horizontal Hat-shaped Stringers Bolted to Vertical Formers Detail B
0.75" (19 mm) 10' - (25 mm) 015" (13 mm) All Material 0125" (3 mm) Thickness Except Center Vertical Former, 0.250" (6 mm) Thick Figure 1 - Burnthrough Test Apparatus Specimen Holder
(2) Test burner. The test burner must be a modified gun-type such as the Park Model DPL 3400.
Flame characteristics are highly dependent on actual burner setup. Parameters such as fuel 744
745 pressure, nozzle depth, stator position, and intake airflow must be properly adjusted to achieve the correct flame output.
Figure 2 - Burnthrough Test Apparatus
(i) Nozzle. A nozzle must maintain the fuel pressure to yield a nominal 6.0 gal/hr (0.378 L/min) fuel flow. A Monarch-manufactured 80[degree] PL (hollow cone) nozzle nominally rated at 6.0 gal/hr at 100 lb/in2 (0.71 MPa) delivers a proper spray pattern.
(ii) Fuel Rail. The fuel rail must be adjusted to position the fuel nozzle at a depth of 0.3125-inch (8 mm) from the end plane of the exit stator, which must be mounted in the end of the draft tube.
(iii) Internal Stator. The internal stator, located in the middle of the draft tube, must be positioned at a depth of 3.75-inches (95 mm) from the tip of the fuel nozzle. The stator must also be positioned such that the integral igniters are located at an angle midway between the 10 and 11 o'clock position, when viewed looking into the draft tube. Minor deviations to the igniter angle are acceptable if the temperature and heat flux requirements conform to the requirements of paragraph VII(e) of this appendix.
(iv) Blower Fan. The cylindrical blower fan used to pump air through the burner must measure
5.25-inches (133 mm) in diameter by 3.5-inches (89 mm) in width.
(v) Burner cone. Install a 12 +0.125-inch (305 ±3 mm) burner extension cone at the end of the draft tube. The cone must have an opening 6 ±0.125-inch (152 ± 3 mm) high and 11 ± 0.125-inch (280 ± 3 mm) wide (See figure 3).
(vi) Fuel. Use JP-8, Jet A, or their international equivalent, at a flow rate of 6.0 ± 0.2 gal/hr
(0.378 ± 0.0126 L/min). If this fuel is unavailable, ASTM K2 fuel (Number 2 grade kerosene) or ASTM D2 fuel (Number 2 grade fuel oil or Number 2 diesel fuel) are acceptable if the nominal fuel flow rate, temperature, and heat flux measurements conform to the requirements of paragraph VII(e) of this appendix.
(vii) Fuel pressure regulator. Provide a fuel pressure regulator, adjusted to deliver a nominal
6.0 gal/hr (0.378 L/min) flow rate. An operating fuel pressure of 100 lb/in2 (0.71 MPa) for a nominally rated 6.0 gal/hr 80 degree spray angle nozzle (such as a PL type) delivers 6.0 ± 0.2 gal/hr (0.378 ± 0.0126 L/min).
1550" (394 mm) Sur — 4- (127 mm
• 19/32" (15 mm) Spaces 10 Degree bends on Broken Line (305 mm) 120 (318 mm) 12,50" 2764" (11 mm) Spaces
- 050" (13 mm) . 050" (13 mm)
• Bolts (25 m) * LƠ°
12.25 Connection flange (311 minu) 110° (279 mm) (152 m)
- 425" (108 mm) Note: Ouchalf of tube * (05 a e) Matetial: 0050* (13 nut) stainless steel extension shown. Second 750 half mates at spotweld overlaps (191 man) Figure 3 - Burner Draft Tube Extension Cone Diagram 747
(3) Calibration rig and equipment.
(i) Construct individual calibration rigs to incorporate a calorimeter and thermocouple rake for the measurement of heat flux and temperature. Position the calibration rigs to allow movement of the burner from the test rig position to either the heat flux or temperature position with minimal difficulty.
(ii) Calorimeter. The calorimeter must be a total heat flux, foil type Gardon Gage of an appropriate range such as 0-20 Btu/ft 2 -sec (0-22.7 W/cm2), accurate to ± 3% of the indicated reading. The heat flux calibration method must be in accordance with paragraph VI(b)(7) of this appendix.
(iii) Calorimeter mounting. Mount the calorimeter in a 6- by 12- ± 0.125-inch (152- by 305- ± 3 mm) by 0.75 ± 0.125-inch (19 mm +/ -3 mm) thick insulating block which is attached to the heat flux calibration rig during calibration (figure 4). Monitor the insulating block for deterioration and replace it when necessary. Adjust the mounting as necessary to ensure that the calorimeter face is parallel to the exit plane of the test burner cone.
6 in x 12 in x 3/4 in 1-in (25 mm) (152 x 305 x 19 mm) dia hole for Marinite block calorimeter mounting 1 in (25 mm) 6 ‡ 1/8 in (152 # 3 mm) 3 ÷ 1/8 in (76 * 3 mm) 12 ÷ 1/8 in (305 = 3 mm) Side View 3/4 in Burner! Cone (19 mm) 1 in (25 mm) dia - 4 * 1/8 in (102 ‡ 3 mm) Water-cooled calorimeter Steel angle 1 x 1 x 1/8 in Rack mounts to (25 x 25 x 3 mm) test frame Top View Figure 4 - Calorimeter Position Relative to Burner Cone 749
1 in Seven (25 mm) thermocouple wires 3 = 1/8 in (76 ÷ 3 mm) Side View Burner Cone 4 ‡ 1/8 in (102 ‡ 3 mm) 1 in (25 mm) Steel angle 1 x 1 x 1/8 in Rack mounts to (25 x 25 x 3 mm) test frame Top View Figure 5 - Thermocouple Rake Position Relative to Burner Cone
(iv) Thermocouples. Provide seven 1/8-inch (3.2 mm) ceramic packed, metal sheathed, type K (Chromel-alumel), grounded junction thermocouples with a nominal 24 American Wire Gauge 750
751 (AWG) size conductor for calibration. Attach the thermocouples to a steel angle bracket to form a thermocouple rake for placement in the calibration rig during burner calibration (figure 5).
(v) Air velocity meter. Use a vane-type air velocity meter to calibrate the velocity of air entering the burner. An Omega Engineering Model HH30A is satisfactory. Use a suitable adapter to attach the measuring device to the inlet side of the burner to prevent air from entering the burner other than through the measuring device, which would produce erroneously low readings. Use a flexible duct, measuring 4-inches wide (102 mm) by 20 feet long (6.1 meters), to supply fresh air to the burner intake to prevent damage to the air velocity meter from ingested soot. An optional airbox permanently mounted to the burner intake area can effectively house the air velocity meter and provide a mounting port for the flexible intake duct.
(4) Test specimen mounting frame. Make the mounting frame for the test specimens of 1/8-inch
(3.2 mm) thick steel as shown in figure 1, except for the center vertical former, which should be 1/ 4-inch (6.4 mm) thick to minimize warpage. The specimen mounting frame stringers (horizontal) should be bolted to the test frame formers (vertical) such that the expansion of the stringers will not cause the entire structure to warp. Use the mounting frame for mounting the two insulation blanket test specimens as shown in figure 2.
(5) Backface calorimeters. Mount two total heat flux Gardon type calorimeters behind the insulation test specimens on the back side (cold) area of the test specimen mounting frame as shown in figure 6. Position the calorimeters along the same plane as the burner cone centerline, at a distance of 4-inches (102 mm) from the vertical centerline of the test frame.
Figure 6 - Position of Backface Calorimeters Relative to Test Specimen Frame
(i) The calorimeters must be a total heat flux, foil type Gardon Gage of an appropriate range such as 0-5 Btu/ft2-sec (0- 5.7 W/cm2), accurate to ± 3% of the indicated reading. The heat flux calibration method must comply with paragraph VI(b)(7) of this appendix.
(6) Instrumentation. Provide a recording potentiometer or other suitable calibrated instrument with an appropriate range to measure and record the outputs of the calorimeter and the thermocouples.