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Double Suction and Multistage Horizontal Split Case Pumps
(2 seal chambers)
Note: The parting gasket between the upper and lower sections of the pump casing must be flush
with the seal chamber bore and face or leakage will occur past the O-rings and gaskets.
3.1
Scribe Mark A on the shaft or sleeve at the face of the seal housing, Figure 5. Refer to the
assembly drawing provided with the seal for the seal collar dimension setting shown in a box .
Scribe Mark B, Figure 5, at this dimension from Scribe Mark A. (See Section 4 for ball drive
designs).
3.2
Lubricate the seal chamber bore with the lubricant provided. The seal chambers are usually
the stuffing boxes, located near the bearing brackets.
3.3
Lubricate one of the stationary face mountings and place it on the back shoulder of the inner
stationary face. Slide the inner stationary face with the O-ring into position at the bottom of the
chamber. The rubbing or sealing surface of the inner stationary face should face out, away from
the pump impeller.
3.4
Wipe the seal faces clean with alcohol. Seal faces should not be lubricated but should be left
clean and dry.
3.5
Lubricate the shaft or sleeve and rotating gasket O-ring with the silicone lubricant provided.
3.6
Install the rotating seal assembly on the shaft or sleeve:
• Inner rotating face with rotating face gasket O-ring, V-ring, or Duraflon wedge.
• Seal assembly.
• Outer rotating face with rotating face gasket O-ring, V-ring, or Duraflon wedge.
The rotating face sealing or rubbing surfaces should be facing away from the springs and
toward the stationary face. Be sure that the seal drive ring drive pins engage the drive slots in
the seal rings.
The RO, PTO, and similar designs have unitized seal assemblies, they 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 face. 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.
Position the rotating seal assembly in its final axial position with the indicated position of the
seal drive lined up with Scribe Mark B. Tighten the seal drive set screws firmly and evenly.
3.7
Lubricate the other stationary face gasket O-ring or Duraflex ring with the silicone lubricate
provided 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
3.8
toward the seal chamber (stuffing box) and the gland or stationary pilot properly engaged.
Do not bump the stationary face against the shaft as it may chip, crack, or break. Tighten the
gland stud nuts evenly, cross stagger the adjustment of the nuts. Follow the equipment
manufacturer's recommendations for gland stud nut torque. In the absence of recommendations,
gland nuts should only be torqued to establish a leak tight seal at the gasket. Proper gland bolt
adjustment is especially important with clamp style stationary faces where excessive torque
may damage the face.
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