Commissioning, Startup, Operation, and Shutdown
Model 3410 Installation, Operation, and Maintenance Manual
44
1. Standard stuffing box bore
2. Non-piloting gland requiring feeler gauge centering on the shaft
Figure 31: S group pump – single inside unbalanced seal
The following figure illustrates a bellows-type balanced mechanical seal mounted in an S group
standard stuffing box. There is inadequate room in the standard stuffing box to mount a
conventional balanced seal requiring a stepped shaft sleeve. Use of these seals requires
remachining of the stuffing box bores.
1. Standard stuffing box bore
2. Non-piloting gland requiring feeler gauge centering on the shaft
Figure 32: S group pump — bellows-type seal
The following mechanical seals can be installed in standard stuffing boxes by using a
remachined, non-pilot gland:
• Crane type 1, 81T, 9T, and Metal Bellows (680)
• Flowserve RO
Mechanical seal converted to packing
Pumps supplied with mechanical seals can be converted to packing. The packing conversion
kit includes all the standard stuffing box fittings plus a liner sleeve that presses into the oversize
stuffing box bore.