Goulds Pumps 3910 11th ed. - IOM - Manual (Page 29)

3. Connect drain line to bottom tapped connection
(Fig. 12).
Oil mist lubrication is required above pumpage temperature
of 232°C (450°F), but may be used at lower temperature.
A high quality turbine oil with rust and oxidation inhibitors
should be used. For the majority of operational conditions,
bearing temperatures will run between 50°C (120°F) and
82°C (180°F). In this range, an oil of ISO viscosity grade
68 at 40°C (100°F) is recommended. If bearing tempera-
tures exceed 82°C (180°F), use ISO viscosity grade 100.
Some acceptable oils are:
Exxon Teresstic EP68
Mobil Mobil DTE 26 300 SSU
@ 40°C (100°F)
Sunoco Sunvis 968
Royal Purpal SYNFILM ISO VG 68
Synthetic Lube
MAINTENANCE OF SHAFT SEALS
!
The mechanical seal used in an ATEX classified
environment must be properly certified.
When mechanical seals are furnished by Goulds, a
manufacturer’s reference drawing is supplied with the data
package. This drawing should be kept for future use when
performing maintenance and adjusting the seal. The seal
drawing will also specify required flush liquid and
attachment points. The seal and all flush piping must be
checked and installed as needed prior to starting the pump.
The life of a mechanical seal depends on various factors
such as cleanliness of the liquid handled and its lubricating
properties. Due to the diversity of operating conditions it is,
however, not possible to give definite indications as to its
life.
s
! WARNING
NEVER operate the pump without liquid supplied to the
mechanical seal. Running a mechanical seal dry, even
for a few seconds, can cause seal damage and must be
avoided. Physical injury can occur if mechanical seal
fails.
!
The mechanical seal must have an appropriate seal
flush system. Failure to do so will result in excess heat
generation and seal failure.
!
Cooling systems such as those for bearing
lubrication, mechanical seal systems, etc., where
provided, must be operating properly to prevent
excess heat generation, sparks and premature
failure.
!
Sealing systems that are not self purging or self
venting, such as plan 23, require manual venting
prior to operation. Failure to do so will result in
excess heat generation and seal failure.
3910-1
1th IOM 5/08
29
Fig. 12
5