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4
Vertical In-line Pumps
For back pullout designs and shaft designs not incorporating a rigid spacer coupling use procedure
as for single end suction vertical split case pumps.
For shaft designs incorporating a rigid spacer coupling:
4.1
Scribe mark A on the shaft or sleeve to line up with the face of the seal housing. Some pump
designs incorporate a shaft or sleeve with vertical or horizontal pins for setting and driving the
seal. In these cases no seal setting measurements are required.
4.2
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 seal spring holder will be located
at this point.
4.3
Lubricate the shaft or sleeve lightly with silicone lubricant provided with the seal before
installing any seal parts.
Install the rotating seal components into the bore of the rotating face.
4.4
4.5
Install the rotating seal component parts 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-cup ring. Use both U-rings, they work
together to form an effective seal.
4.6
Set the back of the spring holder at reference mark B, Figure 5, and tighten set screws firmly
and evenly. In cases where the spring holder is provided with drive slots to engage with the
pins there are no set screws to tighten. Install the rotating components over the shaft or sleeve
and into the bore of the seal housing being sure the slots in the spring holder engage the drive
pins. The rotating component assembly is now in the proper position to provide the correct
setting and spring compression for final assembly.
4.7
Lightly lubricate O-ring or Duraflex stationary face mountings.
4.8
Press the stationary face into the gland (flexibly mounted faces 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 stationary face into the nested O-ring.
4.9
Wipe the seal faces clean with alcohol before completing equipment assembly. Seal faces
should not be lubricated, but should be left clean and dry.
4.10
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.
4.11
Assemble the pump.
4.12
See Operational Recommendations before starting pump.
5
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