Flowserve Single Outside Seal - Manual (Page 4)

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2.5 Lightly lubricate the O-ring or Duraflex stationary seat
gaskets. Where a stationary face has an O-ring mounting on the
shoulder, it is usually better to nest this O-ring in the gland cavity
before installing the face. Other stationary face mountings can be
assembled on the stationary face shoulder.
2.6 Press the stationary face into the gland with the sealing face
orientated toward the outboard side of the gland, facing the rotating
seal face. Use hand pressure only.
2.7 Position the gland over the shaft or sleeve with the stationary
sealing face orientated toward the rotating face sealing face.
Place the gland as close to the rotating assembly as possible.
Do not bump the stationary face against the shaft as it may chip,
crack, or break.
2.8 Install the pump back-plate and assemble the pump. Position
the gland so the gland or stationary face pilot is properly engaged
and tighten the gland stud nuts up evenly, cross staggering the
adjustment of the nuts. The gland nuts should be torqued to a
maximum of 13 N-m (10 ft-lbs). Excessive gland nut pressure can
result in distortion of the insert. Adjust the bearings, coupling,
and impeller so that the shaft is in its operating axial position. Any
subsequent axial adjustment of the shaft requires resetting of the
seal rotary unit.
2.9 Wipe the seal faces clean with alcohol. Seal faces should not be
lubricated but should be left clean and dry.
2.10 Position the rotating assembly so that the seal faces are in
contact and position the spring holder so that the spring gap (or
bellows rotary unit length) is that given on the assembly drawing.
The spring gap dimension is also stamped on the spring holder.
Tighten the set screws firmly and evenly.
2.11 See paragraph 4, Operational Recommendations before starting
pump.