SEAL (PACKING) REPLACEMENT
CB9A-021 page 20/24
1. Follow the steps in "Compressor Disassembly" to
remove the packing boxes.
2. Remove the upper and lower retainer ring from the
packing box being serviced. Disassemble the
packing box and discard the old packing sets and
packing springs.
NOTE: Before reassembling the packing boxes,
refer back to "Seal Arrangements". The 6
th
digit of
the Compressor ID# identifies the packing
orientation.
Fig. 13 - Packing Box X-Sections
3. Packing boxes may contain either one or two sets
of packing, depending on the compressor being
serviced. To reassemble a packing box:
a. Clean the packing box in a suitable solvent.
Inspect the bore for wear, roughness, or
corrosion.
b. See "Seal Arrangements" (Fig. 6 & 7) for the
proper location and orientation of the packing
components. Install the first retainer ring (start
with the inner ring on two seal packing boxes),
then install the packing rings, spring, washers,
and the second retainer ring. Note: To ease
installation on the second retainer ring, use a
screwdriver handle and press on the last
washer to compress the seal spring slightly.
c. Two seal packing boxes only
Insert the oil deflector ring through the top of
the packing box, flat side down, into the cavity
between the upper and lower packing. NOTE:
The oil deflector ring will be positioned
between the two sets of packing. Install the
second set of packing per step b.
Fig. 14 – Seal Component Orientation
4. Packing Break-in
The lower packing must be manually lubricated
with oil several times during the first 60 minutes of
compressor operation. This will prevent
overheating of the piston rods and potential
damage to the packing material. If possible,
perform the packing break-in at a lower speed –
400-500 rpm.
To lubricate the packing:
a. Remove the inspection plate from the
crosshead guide.
b. Run the compressor for 5 minutes then stop
the compressor for 5 minutes to allow adequate
cooling of the piston rods.
c. Lubricate the piston rods each time the
compressor is stopped. A small oil can
should be used for lubrication.
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