Flowserve Single Outside Seal - Manual (Page 5)

5
3 Double Suction and Multistage Horizontal Split Case
Pumps (2 boxes)
3.1 Lubricate the shaft or sleeve lightly with silicone lubricant
provided with the seal before installing any seal parts.
3.2 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 seat gaskets can
be assembled on the stationary face shoulder.
3.3 Press the stationary face into the gland with the sealing face
orientated toward the outboard side of the gland, facing the rotating
face. Use hand pressure only.
3.4 Position the gland over the shaft or sleeve so that the gland or
stationary face pilot is properly engaged and the stationary face
sealing face is facing out. Do not bump the stationary face against
the shaft as it may chip, crack, or break. Tighten the gland stud
nuts evenly in a diagonal sequence. Do not over tighten the gland
nuts. Excessive gland nut pressure can distort the stationary face.
3.5 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 rotating assembly.
3.6 Install the rotating face gasket O-ring into the bore of the rotating
face.
3.7 Engage the rotating assembly consisting of the spring holder,
springs, and seal drive with the rotating face to form the rotating
assembly. Be sure any drive pins in the seal drive ring engage the
slots in the rotating face. This is the complete rotating assembly.
Handle PTFE U-cup rings and Durafite rotating face gaskets with
extreme care, PTFE U-cup rings must be assembled individually
and not pushed on the shaft or sleeve while they are part of the
rotating face rotating assembly. Avoid nicking or pinching either lip
of the U-cup ring. Use both U-cup rings, they work together to form
an effective seal.
3.8 Install the rotating seal component parts on the shaft or sleeve
in the proper sequence with the face of the rotating face facing the
sealing face that is in the gland. Use a slight twisting motion for any
complete rotary unit containing O-ring rotating face gasket.