Stuffing Box; Mechanical Seals - Goulds Pumps 3996 Installation, Operation And Maintenance Instructions

PURE OIL MIST LUBRICATED
BEARINGS (OPTIONAL)
s
! WARNING
Pumps are shipped without oil. Oil mist lubricated
bearings must be lubricated at the job site.
1. Follow oil mist system supplier's instructions.
2. Connect oil mist supply lines to upper and center
tapped connection.
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
temperatures.
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 temperatures exceed 82°C (180°F), use ISO
viscosity grade 100.
PACKED STUFFING BOX
Periodically inspect stuffing box to see that there is
sufficient leakage to lubricate the packing and maintain a
cool box. Never draw up packing so that the stuffing box
heats, as this will cause damage to both packing and
sleeve. Draw up gland nuts slowly and evenly and only
when pump is running.
MAINTENANCE OF SHAFT SEALS
!
The mechanical seal used in an ATEX classified
environment must be properly certified.
!
The mechanical seal must be properly flushed.
Failure to do so will result in excess heat
generation and seal failure.

MECHANICAL SEALS

When mechanical seals are furnished, a manufacturer's
reference drawing is supplied with the data package. This
3996 IOM 9/2010
Some acceptable oils are:

STUFFING BOX

After pump has been in operation for some time and the
packing has been completely "run-in", at least 40 to 60
drops per minute of the liquid should be allowed to trickle
from the stuffing box at all times for cooling and
lubricating the packing and shaft sleeve.
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.
Exxon Teresstic EP68
Mobil DTE 26 300 SSU
Mobil
@ 40°C (100°F)
Sunoco
SYNFILM ISO VG 68
Royal Purpal
Synthetic Lube
Sunvis 968
Fig. 12
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