The following instructions assume that parts of the flammability,
test apparatus have been made according to the drawings. The radiant
panel subassembly has been completed with the exception of the support
brackets and reverberatory screen. The equipment can be assembled
to permit test of specimens of thickness up to 50 mm or 75 mm. Unless
there is a real need for test of thicker specimens, assembly for 50
mm specimens is preferable.
5.1 The panel frame should be placed upright on
a level floor, preferably in the location in which the equipment will
be used.
5.2 The rotating ring should be mounted on its
three guide bearings.
5.3 The panel mount frame should be bolted together,
and to the ring, by four bolts.
5.4 A check should be made that the ring lies
in a vertical plane. If the error is large, an adjustment of the upper
ring support-bearing location may be necessary. Prior to making such
an adjustment, it should be determined whether the error is due to
excessive clearance between the ring and bearing rollers. If this
is the case, rollers of larger diameter may correct the problem.
5.5 The four panel support brackets should be
fastened to the radiant panel at four corners. Do not use too much
force in bolting these brackets in place. Prior to mounting these
brackets, one 35 mm M9 cap screw is placed in the hold that will be
farthest from the panel end. These screws provide a means for mounting
the panel.
5.6 Four washers should be placed on each of the
panel mounting screws and the panel assembled on the mount bracket.
5.7 The angularity of the radiant panel surface
with the plane of the mounting ring should be checked. This can be
accomplished by means of a carpenter's square and measurements to
the refractory tile surface at both ends of the panel. Any deviation
from the required 15° angle may be adjusted by increasing or reducing
the number of washers on the mounting screws.
5.8 The radiant panel should be rotated to face
a specimen mounted in a vertical plane.
5.9 The panel surface should be checked with a
level to ensure that it also lies in a vertical plane.
5.10 The specimen frame with specimen support
rails on side and bottom positions and pilot burner holders assembled
in approximate positions should be brought up to the burner frame
and the two frames fastened together with two bolts and six nuts or
two threaded rods and eight nuts. The spacing between the frames is
roughly 100 mm.
5.11 The spacing of the two sides of the frames
is adjusted to ensure that the specimen support frame longitudinal
members are at a 15° angle to the radiant panel surface.
5.12 The single specimen holder side guide rail
for vertical specimen orientation should be adjusted so that it is
at the required 15° angle to the radiant panel surface.
5.13 An empty specimen holder should be slid into
position on the rail and the position of the upper guide fork adjusted
to ensure that when a specimen is inserted in the holder its surface
will lie in a vertical plane.
5.14 The stop screw determining the axial position
of the specimen holder should be adjusted to ensure that the axis
of the pilot burner is 10 ± 2 mm from the closest exposed edge
of the specimen. This adjustment should again be made by use of an
empty specimen holder and substitution of a 6 mm steel rod of 250
mm length for the pilot burner ceramic tube. When viewed from the
back of the specimen holder, the spacing between rod axis and the
edge of the specimen retaining flange of the holder should be 10 ±
2 mm.
5.15 With the specimen holder still in place against
the top screw, the spacing between the panel and specimen support
frames should be adjusted to make dimension B, Figure 6, equal to about 125 mm.
This adjustment is made by means of the two screws fastening the frames
together. In making this adjustment, it is important to make equal
adjustments on each side to maintain the angular relationship called
for in adjustments 5.11 and 5.12.
5.16 The nuts supporting the specimen holder side
guide rail should be adjusted to ensure that dimension A, Figure 6, is 125 ± 2 mm.
Again, equal adjustments to the two mounting points are required.
When doing this, a check should be made to ensure that the guide rail
and edge of the specimen holder are in a horizontal plane. In making
this adjustment, it is important to ensure that the 45 mm stack position
dimension shown in Figure 7 is
maintained. Another way of adjustment to dimension A is through changes
in the number of washers mentioned in 5.6.
5.17 If necessary, procedure 5.13 should be repeated.
5.18 The reverberatory screen should be mounted
on the radiant panel. This must be done in such a manner that it is
free to expand as it heats up during operation.
5.19 The viewing rake with 50 mm pins is mounted
on an angle fastened to the specimen holder guide rail. Its position
is adjusted so that pins are located at multiples of 50 mm distance
from the closest end of the specimen exposed to the panel. It should
be clamped in this position.