2202L5JE-DA-C5-N_2015.05.
5 Maintenance and Inspection
Compound 2-stage Screw Compressor
5.5
Reassembly
1612LSC Speed Increaser Type
5-68
Measuring Fastening Margin for Seal
j) Install the seal cover with the gasket, so that the oil drop piping of the seal cover is on the bottom
side. At this time, assemble it carefully, either at a right angle or by delaying the upper side slightly,
to ensure that the mating ring inside the seal cover does not hit the rotor shaft.
k) The seal ring and the mating ring sliding surface will
come into contact midway through attachment. At this
moment, check the dimensions between the seal cover
gasket and the speed increaser gear casing cover
flange surface by using a taper gauge (picture below).
This value is called fastening margin for seal.
It is used when checking the sliding face pressure
between the rotating ring and stationary ring of the seal.
In case of BBSE-type seal of the 1612**C, make sure
that this value is in the range of two to three mm.
With the 1612**C compressor, the thickness of the seal
cover gasket is 0.5 mm.
m) When the seal fastening margin is proper, push the seal
cover firmly into the speed increaser gear casing cover. Since there is repulsion force of the seal
bellows, keep it pushed firmly and tighten the two hexagon socket head cap screws
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53
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(for
tightening the seal cover) evenly at positions 180 degrees apart. When there is no gap between the
flange surface and the gasket, tighten all of the remaining bolts to the specified torque (25 N·m).
n) The hole for fastening the seal collar set screw on 1612LSC speed increaser models is on the
speed increaser gear casing cover, so do not forget to plug it after attaching the seal cover.
o)
After fastening the seal cover, remove the plug on the top of the seal cover (above picture red
arrow). Then supply oil approx 160 mL or more into the seal cover while rotating the rotor shaft.
This oil refilling work is very important to maintain the airtightness in the shaft seal block when
vacuuming after the compressor overhauling.
After oil refilling work, make sure to attach the removed plug on the seal cover.
