9
ITEM
A-03-343
DATED
NOVEMBER 2012
SUPERCEDES
MARCH 2011
1. Release the nuts of the tightening bolts
on the pressure plate.
a. Release the tightening bolts
evenly in small steps on alternate
sides (1-2- 3-4) and diagonally
(1-2 and 3-4), in order to prevent
overloading individual tightening
bolts and tilting the pressure.
b. Proceed similarly in the case of
frames with more than 4 tightening
bolts.
2. Remove the nuts without removing
the tightening bolts. Push the pressure
plate out toward the support leg about
half-way from where it was when
tightened fully. The heat exchanger
plates will start to fall over, but will
not fall enough to disengage from the
frame. If you accidentally move the
pressure plate too far, the tie rods will
hold the plates and keep them from
falling out.
3. Move the heat exchanger plates so
that they lean back against the fixed
pressure plate.
4. Now remove the tightening bolts and
pull the loose pressure plate all the
way to the end of the frame. You can
now safely remove the heat exchanger
plates. One operator should remove
the plates, and the other should make
sure that the plates do not slip at the
bottom and fall out.
OPENING HEAT EXCHANGERS WITH A BY FRAME.
1. Release the nuts of the tightening bolts
on the pressure plate.
a. Release the tightening bolts
evenly in small steps on alternate
sides (1-2- 3-4) and diagonally
(1-2 and 3-4), in order to prevent
overloading individual tightening
bolts and tilting the pressure plate.
b. Proceed similarly in the case of
frames with more than 4 tightening
bolts.
c. When all are fully loosened,
remove the nuts and then the tie
rods.
2. Move the pressure plate right up to the
support column.
3. To remove the plates, swing each heat
exchanger plate out to the side to clear
the lower beam, then keep it at that
angle and tilt it toward you to unhook
it from the upper beam.
REINSTALLING THE PLATES AND
CLOSING THE HEAT EXCHANGER.
NOTE: Before the installation and before
closing the plate heat exchanger, observe the safety
instructions in the section “Preparatory Precautions”.
NOTE: When all the heat exchanger
plates are correctly installed, the outside
of the plate pack must show a continuous
honeycomb pattern. You can also check
that the plates are in the right order by
means of the diagonal line on the outside
of the plate pack, which you painted
before opening the heat exchanger.
1. Make sure that the gaskets and heat exchanger plates are
free of foreign matter or contamination.
a. If necessary, clean them with running water and a soft
brush.
2. Check that the gaskets fit correctly in the grooves of the heat
exchanger plates.
3. For a heat exchanger with a BY frame, clean the hanging
rail on the upper beam and lubricate it.
4. Clean the threads of the tie rods as well as the tie rod nuts
and apply a thin layer of grease to
these.
5. Mount all the heat exchanger plates
into the heat exchanger frame in the
correct order according to the flow
diagram.
a. In the case of a CY frame, the
following actions are required:
• Before installing the heat
exchanger plates, screw in two
tightening bolts to serve as securing elements.
• Every heat exchanger plate you put in should safely
lean against the fixed plate.
• Have another operator hold and secure the plate pack.
• Push the pressure plate against the plate pack and put in
the remaining tightening bolts.
6. Determine the required compression dimension (“a”
dimension). The required a-dimension is:
a. When completely replacing the gaskets: use the “a-max”
printed on the data plate.
b. When the heat exchanger plates are only cleaned and no
gaskets are replaced: use the a-dimension written down
before opening the heat exchanger.
c. When changing the number of heat exchanger plates:
use the new “a-max” dimension supplied with the flow
diagram and the new data plate.
7. Tighten the tie rods according to these
steps.
a. Tighten the tie rod assemblies
evenly in small steps on alternate
sides (1-2- 3-4) and diagonally
(1-2 and 3-4), in order to prevent
overloading individual tightening
bolts and tilting the pressure plate.
b. Proceed similarly in the case of
frames with more than 4 tightening bolts.
8. Carry out a leak test before restarting the heat exchanger.
Danger:
Damage to the
Heat Exchanger Plates!
If the heat exchanger is tightened to
an a-dimension that is less than the
“a min” shown on the data plate, this
generally damages the heat exchanger
plates. Ensure that the plate pack is only
compressed to the necessary dimension
“a min.” < “a” < “a max.”
