2202MYJE-MY-C8-N_2018.02.
Chapter 5 Maintenance and Inspection
Compound 2-stage Screw Compressor 3225**C 5.5 Reassembly
5-59
j) Apply oil on the seal cover gasket [52] and attach it to the seal cover flange by carefully aligning the
oil hole position on the gasket and the one on the flange.
◆ In the case of the standard internal oil supply system, oil is first sent from the bearing cover to
the seal cover through the oil supply hole machined on them, then from the notch in the seal
cover to the upper part of the seal cover through a groove, and lastly supplied from the oil supply
hole in the seal cover to the upper part of the sliding surface of the mechanical seal.
k) Install the seal cover with the gasket such that the oil drop tube comes to the bottom side.
At this time, carefully install the seal cover not to hit the mating ring in the seal cover with the rotor
shaft. For this, hold the seal cover at the right angle to the rotor shaft or only slightly incline it such
that the top side follows the bottom side.
m) At a midway point, the sliding surface of the seal ring comes in contact with that of the mating ring.
At this point, use a taper gauge (Photo 113) to check the clearance between the surfaces of the seal
cover gasket and the bearing cover flange. This clearance is called "fastening margin" of the seal,
and is used as a guideline in determining the sliding surface pressure between the rotating ring and
stationary ring of the seal. In case of the BBSE type seals for 3225**C, make sure that this value is
in the range of 3.5 to 4.5 mm.
n) If it is confirmed that the fastening margin of the seal
is appropriate, firmly press the seal cover onto the
bearing cover. While you will feel the reaction of the
seal bellows, keep pressing the cover and fasten
two hexagon socket head cap screws [53] evenly to
secure the seal cover at opposite positions
separated by 180°. When there is no clearance
between the surface of the flange and gasket, fasten
all other bolts at the specified torque of 240 N･m.
o) After fastening the seal cover, remove the plug on
the top of the seal cover, and supply oil approx. 600
mL into the seal cover while rotating the rotor shaft
(Photo 114).
This oil refilling work is very important to maintain
the airtightness in the shaft seal block when
vacuuming after compressor overhauling.
After the refilling work, make sure to attach the
removed plug on the seal cover.
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