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Figure 9: Connection Inspection Locations and
Manual Draw-Up Tie Rod Pattern
l. The large draw-up rod lugs with dual holes
are cast in the four (4) corners of each casting.
STARTING WITH THE UPPER HOLES,
install four (4) 5/8" x 9¾" long draw-up rods
along with washers and nuts (see Figure 9).
To avoid damage to the draw-up rod threads while
drawing up sections, apply oil or other lubricant to tie rod
threads while assembling sections to prevent stripping
of threads on rod and to make assembling easier.
Pour éviter d'endommager les filetages de la tige de
traction lors de l'étirage des sections, appliquez de l'huile
ou un autre lubrifiant sur les filetages de la tige de traction
lors de l'assemblage des sections pour éviter le dénudage
des filetages sur la tige et pour faciliter l'assemblage.
Do not substitute other material for draw-up rods.
Ne substituez pas d'autres matériaux aux tiges de
traction.
m. DRAW UP SECTION SLOWLY AND
EVENLY using an alternating pattern starting
with the upper right lug (closest to the 7" port)
and proceeding to the lower left , lower right
and finishing with upper left lug. When you
start, grind surfaces between adjoining sections
should be approximately 3/8" apart. Use three
(3) or four (4) passes at tightening the four (4)
draw-up rods a little at a time so that sections
are pulled up evenly. During the last pass,
pay close attention to the silastic sealant as
24
it squeezes when the sections come in close
contact. The silastic sealant should continue
to squeeze out wafer thin until the sections are
connected metal to metal. If the silastic has
stopped squeezing out from the connection and
the sections still do not appear to be drawn metal
to metal, use a feeler gauge to measure any gaps
at the locations identified in Figure 9. (Unless
specified otherwise, gaps should be measured at
these locations on both sides of the sections.) A
maximum gap of .025" is acceptable. Measure
gaps at the outer edge of the connection only,
making sure not to puncture the gasket created
by the silastic and rope.
When tightening the draw-up nuts, DO NOT EXCEED
150 FT-LB OF TORQUE. If the maximum torque limit has
been reached and a gap greater than .025" still exists
between the sections, consult the regional office.
Lors du serrage des écrous de serrage, NE PAS
DÉPASSER 150 PI-LB DE COUPLE. Si la limite de
couple maximum a été atteinte et qu'un écart supérieur
à 0,025 " existe toujours entre les sections, consultez
le bureau régional.
KEEP NIPPLES ALIGNED WITH NIPPLE
PORTS. If necessary, tap edge of nipples lightly
with a blunt tool or rod to keep nipples from
cocking while sections are being drawn-up. DO
NOT DRAW UP SECTION WHEN NIPPLES
ARE COCKED. If the torque required becomes
excessive, periodically place a heavy block of
wood over each nipple port and strike as squarely
as possible with several blows to relieve tension
on the draw-up rods.
n. CONTINUE ASSEMBLING SECTIONS IN
THEIR RESPECTIVE ORDER alternating
draw-up rods from the upper to lower set of
holes in draw-up lugs (see Figure 10). Be certain
that all sections are drawn up iron-to-iron at all
three (3) nipple ports.
BE SURE TO APPLY THE SEALANT to
the groove in the ground joints between
adjacent sections as the boiler operates with a
positive pressure in the firebox and products of
combustion will escape between sections unless
the sections are properly sealed. The sealant
should be applied before each section is placed
on the assembly.
o. If a joint springs apart it must be redrawn tight
within four (4) hours of the time of application
of silastic sealant to that joint.
p. EXCESS LENGTH OF DRAW-UP RODS must
not extend beyond front and rear section to
ensure proper fit of jacket, adjust accordingly.
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