Flowserve Tandem Seal - Manual (Page 5)

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2.15 Seat the gland ring 1 and gland ring gasket G to the face of the seal
chamber by tightening the nuts or bolts evenly. Be sure the gland ring is not
cocked and tighten the nuts or bolts only enough to seal at the gland ring
gasket. Excessive tightening of the gland ring nuts or bolts will cause distor-
tion that will be transmitted to the running faces. Follow proper gland gasket
torquing instructions.
3 Operational Recommendations
3.1 The outer seal must be supplied with an external sealing buffer liquid. This
buffer should be introduced to the cavity between the inner and outer seals
and circulated by forced circulation (Figure 3) at a pressure below the
primary seal chamber pressure.
3.2 Flowserve Corporation manufactures both packaged circulation systems
and components, Figure 4. Contact your nearest Flowserve representative.
3.3 Be sure the sealing liquid to the outer seal is available and all environmen-
tal controls for the inner seal are operational before starting the process
equipment.
3.4 If the seal is running hot, check to see that the gland ring is not rubbing the
shaft. These clearances can be checked by using a feeler gauge.
3.5 If there is a leakage at the gland on start-up, it may be corrected by adjust-
ing the gland for better alignment.
4 Repairs
This product is a precision sealing device. The design and dimension tolerances
are critical to seal performance. Only parts supplied by Flowserve should be used
to repair a seal. These are available from numerous Flowserve stocking loca-
tions. To order replacement parts, refer to the part code number and B/M number.
A spare back-up seal should be stocked to reduce repair time. The following
parts can also be stocked for emergency needs.
2 Inserts C Springs
3 Seal Rings G Gaskets
6 Insert Mountings P Shaft Packings
S Set Screws
When seals are returned to Flowserve for repair, decontaminate the seal
assembly and include an order marked "Repair or Replace." A signed
certificate of decontamination must be attached. A Material Safety Data
Sheet (MSDS) must be enclosed for any product that came in contact with the
seal. The seal assembly will be inspected and, if repairable, it will be rebuilt,
tested, and returned.