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Double Suction and Multistage Horizontal Split Case Pumps (2 boxes)
3.1
Scribe mark A on the shaft or sleeve to line up with the face of the seal housing.
3.2
Scribe mark B at the seal setting point shown enclosed in a rectangular box on the assembly
drawing included with the seal. This seal setting dimension is measured from the face of the
seal housing to the back of the spring holder. The back of the spring holder will be located at
this point.
3.3
Lubricate the shaft or sleeve lightly with the lubricant provided with the seal before installing
any seal parts.
3.4
Install the rotating face gasket into the bore of the rotating face.
3.5
Install the rotating seal components on the shaft or sleeve in the proper sequence. 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 installed in the
rotating face. Avoid nicking or pinching either lip of the U-ring. Use both U-cup rings, they work
together to form an effective seal.
3.6
Set the back of the spring holder at reference mark B, Figure 5, and tighten set screws firmly
and evenly. The rotating component assembly is now in the proper position to provide the
correct setting and spring compression for final assembly.
3.7
Lightly lubricate O-ring or Duraflex stationary face gaskets.
3.8
Press the stationary face into the gland (flexibly mounted face only). Use hand pressure only.
Where a face has an O-ring mounting on the back shoulder, it is usually better to nest this O-ring
into the gland cavity and then push the face into the nested O-ring.
3.9
Wipe the seal faces clean with alcohol before completing equipment assembly. Seal faces
should not be lubricated, but should be left clean and dry.
3.10
Position the gland to the face of the seal housing. Be sure the gland pilot is properly engaged.
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 gland
gasket. Proper gland bolt adjustment is especially important with clamp style stationary faces
where excessive torque may damage the face.
3.11
Assemble the pump.
3.12
See Operational Recommendations before starting pump.
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