Goulds Pumps ANSI FAMILY IOM (ATEX Compliant) - Manual (Page 52)

MAINTENANCE OF SHAFT SEALS
!
The mechanical seal used in an ATEX
classified environment must be properly
certified.
MECHANICAL SEALS
When mechanical seals are furnished, 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 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.
PACKED STUFFING BOX
(3196, CV 3196, HT 3196, LF 3196, 3796)
!
Packed stuffing boxes are not allowed in an
ATEX classified environment.
Packing operation can be inspected without shutting
down or disassembling the pump. During normal
operation the packing should leak approximately one
drop per minute. If the drip rate is higher or lower
than one drop per minute then an adjustment of the
gland may be required. To slow down the leakage
rate, the two gland bolts should be tightened evenly
one-quarter (¼) turn each until the desired leakage
rate is obtained. NEVER over-tighten packing to the
point where less than one drop per minute is
observed. Overtightening can cause excessive wear
and power consumption during operation. If the
packing cannot be tightened to obtain less than two
drops per minute, then the packing may need to be
replaced and the packing installation procedures
under Operation should be followed.
$
CAUTION
Never attempt to replace packing until the
driver is properly locked out and the coupling
spacer is removed.
DYNAMIC SEAL (3196, CV 3196, LF 3196)
!
Dynamic seals are not allowed in an ATEX
classified environment.
Dynamic Seal Components
Repeller - The dynamic repeller effectively prevents
leakage of pumpage through the stuffing box when
the pump is operating under published acceptable
conditions. Dynamic seal parts do not wear
substantially to affect operation unless the service is
particularly abrasive or corrosive. Refer to
Disassembly and Reassembly Section for
maintenance, disassembly, and repair.
50
ANSIFAM IOM - 5/08
Fig. 36 Dynamic Seal with Packing