Crown Boiler 24-07 用户手册

16

  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 it squeezes when the sections 

come in close contact.  The silastic sealant will 

continue to squeeze out wafer thin until the 

sections are connected metal to metal.  While 

tightening the nuts, close attention should be 

given to the connection area to determine that 

the silastic has stopped squeezing out from 

between the sections.  This will give assurance 

that the sections are assembled 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, measure any gaps 

between the sections with a feeler gauge.  A 

maximum gap of .025” is acceptable.  Gaps 

should be measured at the outer edge of the 

connection.  DO  NOT  PUNCTURE  THE  

GASKET  CREATED  BY  THE  FIBERGLASS  

ROPE  AND  SILASTIC  

   SEALANT  WITH  THE  FEELER  GAUGE.

   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 

2.  ASSEMBLY OF SECTIONS (HYDRAULIC DRAW-

UP)

  The entire boiler assembly may be drawn up at one  

time using hydraulic draw-up equipment providing  

the operation is completed within four (4) hours after 

application of the sealant.
a.  Repeat steps 1a through 1k under “Field  

Assembled Sections (Manual Draw-Up).”

b.  Continue driving sections in place (in their 

respective order) until all sections are in the 

assembly.  Ground surfaces between adjoining 

sections should be spaced 1/4” to 3/8” apart.  

Spacing of more than 3/8” will limit number of 

sections that can be drawn up in one unit and  

could indicate cocked nipples.

   

 

 

 

 

 

 

 

 

 

On long boiler assemblies, it may be necessary to 

draw-up a partial block if the entire boiler is not 

ready to be drawn-up tight within four (4) hours  

of the first application of Silastic.  If the block 

assembly time extends overnight, the partial block 

completed must be drawn-up tight before leaving 

the boiler overnight.  If a joint springs out, it must 

be redrawn tight within four (4) hours of first 

application of Silastic to the joint.

c.  Insert the three (3) ¾” draw-up rods (and  

couplings, if appropriate) through the tapped holes 

in the rear section extending them through the 

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 

the draw-up rods from the upper to lower set 

of holes in draw-up lugs.  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 to that joint.