Goulds Pumps 3311 - IOM - Manual (Page 28)

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7.6.1 Tightening torques
Size 2x3-7
No. of stages
≤ 12
13 - 15 16 - 18
Tightening
torque 710 Nm 850 Nm 900 Nm
Size 2.5x4-8
No. of stages ≤ 8 9 - 13 14 - 18
Tightening
torque 610 Nm 920 Nm 980 Nm
Size 4x5-11
No. of stages
≤ 4
5 - 8 9 - 12 13 - 15
Tightening
torque 790 Nm 1420 Nm 1570 Nm 1790 Nm
7.6.2 Pump assembly
- Installation starts on the suction side.
- The pump should be assembled in a vertical position, if
possible.
- Install the parts in their original position.
- Observe the sectional drawing with list of components.
- Lightly tighten the nuts of the tie bolts.
- Place pump on its feet, in horizontal position, on a flat
work surface.
- Tighten nuts of the tie bolts in several stages in
diagonal sequence (nominal tightening torque at last
stage).
7.6.2.1. Shaft seal
Packed stuffing box
CAUTION
• The packing rings must not be inserted until after the
pump, including the bearings, has been completely
installed.
- Only pre-compressed packing rings are permissible.
- Thoroughly clean the packing area and the stuffing box
gland.
- The first packing ring should now be laterally bent
open and pushed on the shaft wearing sleeve.
- Slide the packing ring into the packing chamber using
the stuffing box gland.
- Install the other packing rings in the same manner,
however with the gaps 180° apart.
- Turn the gland nuts finger-tight.
- Check that the gland is not tightened at a slant.
CAUTION
• The pump rotating assembly must be free to rotate by
hand.
• The stuffing box leakage must not be adjusted until
start-up (see Section 6).
Dimensions Pump
size
in mm 2x3-7 2.5x4-8 4x5-11
Packing cross-section 10 10 12.5
Number of rings 4 5
Shaft diameter 45 75 95
Mechanical seals
CAUTION
• Utmost care should be taken when mounting the
rotary and stationary seal rings so as to avoid
contamination and/or distortion on the sealing
surfaces.
• EPDM seals must not be exposed to oil or grease.
• In order to achieve the compression pressure required
for the operational reliability of the mechanical seal,
check the axial installation dimension against the
installation drawing.
- Install the mechanical seal in the reverse manner to
disassembling.