Burnham MPC Installation And Operation Manual page 24

step f. After all sections have been drawn up,
retention rods must be installed. Do not release
hydraulic pressure until the retention rods are in
place.
step g. Locate the threaded 5/8" retention rods,
washers, tension springs and nuts supplied in
'BAC' Boiler Assembly Carton. Assemble both
top retention rod assemblies as shown in Figure
5, Detail B, using the proper arrangement per
Table VI. The tension spring should always
be located at the rear of the boiler. These rod
assemblies can be lowered directly into slotted
lugs on each side of the upper nipple port. Hand
tighten the rear nuts only, do not torque nut at
this time.
All casting legs have two (2) holes. Slide the
lower retention rods through the upper hole in
each leg. Start the front or rear, which ever is
easiest, per the arrangement shown in Table VI.
With the rods in place, install a 5/8" flat washer
and 5/8" hex nut on each rod protruding through
the front legs. On 8 through 18 section block
assemblies, additional rods and couplings nuts
are required to span the distance. On these larger
sizes, thread couplings on front rods to mid point
of coupling (halfway), pull next rod forward to
meet front coupling. Hold front coupling, not
front rod, while threading rear rod into coupling
nut until it contacts front rod at mid point.
Repeat this process until both lower rods
protrude through rear section legs. In the
following order, place a 5/8" flat washer, 5/8"
tension spring and 5/8" hex nut on both rods.
Hand tighten rear nut only to remove all slack
from the lower rod assemblies. Use a torque
wrench adjusted for 20 ft/lb of torque to tighten
four (4) rear hex nuts. In lieu of a torque
wrench, use a combination wrench to tighten
nuts approximately ¾ turn beyond hand tight, to
set tension.

Excess length of draw-up rods must not extend
beyond front and rear section to ensure proper fit
of jacket, adjust accordingly.
step h. Release tension on hydraulic pumps and
rams and remove.
c.
HYDROSTATIC TEST - After the boiler sections
have been assembled, it is essential that the boiler
be hydrostatically tested before the jacket frame,
insulation, internal wiring, piping or jacket is installed.
THIS TEST IS AN ASME CODE REQUIREMENT.
1. Block Assembly must be free of air, provide valve in
4" bushing on top supply tapping to purge air during
the filling process. Plug all boiler tappings and fill
entirely with cold water.
CAUTION
DO NOT install gauge until after hydrostatic
testing the boiler. Gauge failure may result.
2. Assembled boilers shall be subjected to a hydrostatic
test of not less than 1½ times the maximum
allowable working pressure, as established by the
relief valve supplied with the boiler. For example, a
boiler with a 50 psi relief valve must be subjected to
a test pressure of 75 psig to 85 psig.
WARNING
Failure to properly hydrotest all boilers at the
correct pressure may result in section assembly
failure in operation.
3. EXAMINE BOILER CAREFULLY, INSIDE
AND OUTSIDE, to insure against leaks from
cocked nipples or through concealed breakage
caused in shipping and handling. This precaution
is for your protection and will simplify handling of
necessary replacements and adjustment claims.
4. After making certain that there are no leaks, drain
boiler and remove plugs from boiler trim and other
connections.