Goulds Pumps CV 3171 - IOM - Manual (Page 49)

CV 3171 IOM 05/11 49
Figure 48
193I
355
494V
190G
540M
367B
221
353
107
105
355C
364A
189
106
APPENDIX II
UPPER STUFFING BOX AND VAPOR PROOF CONSTRUCTION
The Model CV 3171 is normally a sealless design.
When temperatures exceed 180 degree F, it is
necessary to move the thrust bearing away from the
heat source in the sump. This is accomplished by
adding the upper stuffing box. Air is then allowed to
circulate around the bearing keeping it cool. The upper
stuffing box is also used to minimize vapor emissions
when handling controlled substances. Proper
installation and maintenance of a vapor proof pump
along with the correct sealing device can give you
vapor free installations. Refer to Figure 48 for stuffing
box layout.
Packed Stuffing Box
Packed stuffing boxes are not allowed in
an ATEX classified environment
The stuffing box is packed at the factory. A grease cup
supplied with the pump lubricates the packing.
Fill the grease cup with any Lithium based #2 grease.
Packing Replacement
1. Should it become necessary to replace the
packing, the sequence is three rings of
packing, lantern ring and then two rings of
packing followed by the gland.
2. Install the grease cup on the tapped opening
on the stuffing box.
3. Turn the cap on the grease cup several turns
to inject grease into the packing.
4. Make sure gland nuts are finger tight. Final
adjustment is made.
Operation and Maintenance
1. Keep the grease cup full of grease at all times.
2. Periodically make several turns on cap on the
grease cup injecting fresh grease into the stuffing
box. Lubrication interval will vary depending upon
the temperature and gland tightness. Experience
will dictate the best interval for your service. Start
by checking the pump daily, and extend the interval
as required until you are comfortable that the
proper maintenance interval has been achieved.
CAUTION
Do not over tighten the gland as this will lead to shaft
damage. The pump is sealing only vapors so finger
tight is adequate.
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