Flowserve Dual Pressurized Seals - Manual (Page 3)

3
1.7 Check gland pilot and bolt holes to ensure they are adaptable to the equipment
and are the same as shown on the assembly drawing.
1.8 Handle all seal parts with care, they are manufactured to precise tolerances.
The sealing faces are of special importance and are lapped flat to within three
light bands (34.8 millionths of an inch). Keep the seal faces perfectly clean
at all times.
Dual Seal Installation
2 Single End Suction Vertical Split Case and
Vertical In-Line Pumps (1 seal chamber)
2.1 Scribe Mark A on the shaft or sleeve at the face of the seal housing,
Figure 1. Refer to the assembly drawing provided with the seal for the seal setting
dimensions. Scribe Mark B, Figure 1, at this dimension from Scribe Mark A.
(See Section 4 for ball drive designs).
2.2 Lubricate one of the two stationary face mounting O-rings or Duraflex rings
with the silicone lubricate provided with the seal and nest this O-ring in the
gland cavity. Press the outer stationary face into the gland with the sealing
surface orientated toward the inboard side of the gland. Use hand pressure only.
Position the gland over the shaft or sleeve with the stationary face sealing surface
orientated toward the seal chamber (stuffing box). Place the gland as close to the
bearing bracket as possible. Do not bump the stationary face against the shaft as it
may chip, crack, or break.
2.2 Lubricate the shaft or sleeve with the silicone lubricant provided.
2.3 Install the rotating seal assembly on the shaft or sleeve:
• Outer rotating face with rotating face gasket O-ring, V-ring, or Duraflon wedge.
• Seal assembly.
• Inner rotating face with rotating face gasket O-ring, V-ring, or Duraflon wedge.
The rotating face sealing surfaces should be facing away from the springs and
toward the stationary faces. Be sure that the seal drive pins engage the drive slots
in the rotating faces.
The RO, PTO, and similar designs have buttoned seal assemblies that can most
easily be installed on the shaft or sleeve as a unit with the rotating face gasket
O-rings in place in the bore of the rotating faces. The BRO, MRO, and similar
designs are generally larger in diameter and the rotating seal parts are most
easily installed as individual components.
Handle Duraflon V-rings, wedge rings, Durafite, and Duraflex with extreme care.
Duraflon V-rings must be assembled individually and not pushed on the shaft or
sleeve while they are part of the rotating face or rotating seal assembly. Avoid
nicking or pinching either lip of the V-ring. Use both V-rings, they work together
to form an effective seal.