spaschal on DSK3GDR082PROD with CFR

Pt. 25, App. F

14 CFR Ch. I (1-1-19 Edition)

Ensure that the horizontal centerline of
the burner cone is also offset 1 inch below
the horizontal centerline of the thermocouple tips. Re-check measurements by rotating the burner to each position to ensure
proper alignment between the cone and the
calorimeter and thermocouple rake. (Note:
The test burner mounting system must incorporate  - detents -  that ensure proper centering of the burner cone with respect to
both the calorimeter and the thermocouple
rakes, so that rapid positioning of the burner
can be achieved during the calibration procedure.)
(2) Position the air velocity meter in the
adapter or airbox, making certain that no
gaps exist where air could leak around the
air velocity measuring device. Turn on the
blower/motor while ensuring that the fuel solenoid and igniters are off. Adjust the air intake velocity to a level of 2150 ft/min, (10.92
m/s) then turn off the blower/motor. (Note:
The Omega HH30 air velocity meter measures 2.625 inches in diameter. To calculate
the intake airflow, multiply the cross-sectional area (0.03758 ft2) by the air velocity
(2150 ft/min) to obtain 80.80 ft3/min. An air
velocity meter other than the HH30 unit can
be used, provided the calculated airflow of
80.80 ft3/min (2.29 m3/min) is equivalent.)
(3) Rotate the burner from the test position to the warm-up position. Prior to lighting the burner, ensure that the calorimeter
face is clean of soot deposits, and there is
water running through the calorimeter. Examine and clean the burner cone of any evidence of buildup of products of combustion,
soot, etc. Soot buildup inside the burner
cone may affect the flame characteristics
and cause calibration difficulties. Since the
burner cone may distort with time, dimensions should be checked periodically.
(4) While the burner is still rotated to the
warm-up position, turn on the blower/motor,
igniters and fuel flow, and light the burner.
Allow it to warm up for a period of 2 minutes. Move the burner into the calibration
position and allow 1 minute for calorimeter
stabilization, then record the heat flux once
every second for a period of 30 seconds. Turn
off burner, rotate out of position, and allow
to cool. Calculate the average heat flux over
this 30-second duration. The average heat
flux should be 16.0 Section0.8 Btu/ft2 sec (18.2 Section0.9 W/
cm2).
(5) Position the burner in front of the thermocouple rake. After checking for proper
alignment, rotate the burner to the warm-up
position, turn on the blower/motor, igniters
and fuel flow, and light the burner. Allow it
to warm up for a period of 2 minutes. Move
the burner into the calibration position and
allow 1 minute for thermocouple stabilization, then record the temperature of each of
the 7 thermocouples once every second for a
period of 30 seconds. Turn off burner, rotate
out of position, and allow to cool. Calculate

the average temperature of each thermocouple over this 30-second period and record.
The average temperature of each of the 7
thermocouples should be 1900 SectionF Section100 SectionF (1038
Section56 SectionC).
(6) If either the heat flux or the temperatures are not within the specified range, adjust the burner intake air velocity and repeat the procedures of paragraphs (4) and (5)
above to obtain the proper values. Ensure
that the inlet air velocity is within the
range of 2150 ft/min Section50 ft/min (10.92 Section0.25 m/
s).
(7) Calibrate prior to each test until consistency has been demonstrated. After consistency has been confirmed, several tests
may be conducted with calibration conducted before and after a series of tests.
(f) Test procedure. (1) Secure the two insulation blanket test specimens to the test
frame. The insulation blankets should be attached to the test rig center vertical former
using four spring clamps positioned as shown
in figure 7 (according to the criteria of paragraph paragraph (c)(3)(iv) of this part of this
appendix).
(2) Ensure that the vertical plane of the
burner cone is at a distance of 4 Section0.125 inch
(102 Section3 mm) from the outer surface of the
horizontal stringers of the test specimen
frame, and that the burner and test frame
are both situated at a 30Section angle with respect
to vertical.
(3) When ready to begin the test, direct the
burner away from the test position to the
warm-up position so that the flame will not
impinge on the specimens prematurely. Turn
on and light the burner and allow it to stabilize for 2 minutes.
(4) To begin the test, rotate the burner into
the test position and simultaneously start
the timing device.
(5) Expose the test specimens to the burner
flame for 4 minutes and then turn off the
burner. Immediately rotate the burner out of
the test position.
(6) Determine (where applicable) the
burnthrough time, or the point at which the
heat flux exceeds 2.0 Btu/ft2-sec (2.27 W/cm2).
(g) Report. (1) Identify and describe the
specimen being tested.
(2) Report the number of insulation blanket specimens tested.
(3) Report the burnthrough time (if any),
and the maximum heat flux on the back face
of the insulation blanket test specimen, and
the time at which the maximum occurred.
(h) Requirements. (1) Each of the two insulation blanket test specimens must not allow
fire or flame penetration in less than 4 minutes.
(2) Each of the two insulation blanket test
specimens must not allow more than 2.0 Btu/

442

VerDate Sep<11>2014

12:50 Apr 30, 2019

Jkt 247046

PO 00000

Frm 00452

Fmt 8010

Sfmt 8002

Y:\SGML\247046.XXX

247046