RDL
7.4 Shaft Seal Maintenance
7.4.1 Mechanical Seal Maintenance
In case of supply of pump with mechanical seal, additional instructions from seal manufacturer should be followed.
7.4.2 Packing Maintenance
If shaft sealing has already been tightened equivalent to a packing ring thickness and even so it presents excessive leakage, it
must be checked as follow:
- Stop the pump
- Loosen nuts of gland cover and push it to the bearing housing direction in order to have enough space for work
- Extract, with the help of a deflective spindle, all the packing rings and lantern ring
- Clean all shaft seal chamber
- Check surface of protective sleeves. If they present roughness or grooves replace them
- Cut new packing rings with oblique end (see fig. 23). To facilitate cut, a disposal of easy construction can be used (see fig.
24).
Fig.23 – Oblique cut of the gasket
Fig.24 – Device to cut packing rings
- Lubricate internal diameter of each packing ring with grease
- Lubricate external diameter of lantern ring with Molykote paste G
- Proceed the assembly in the reverse sequence of the disassembly, introducing each part inside the chamber with auxiliary
of gland cover. Packing rings should be assembled with their extremity displaced about 90º from each other. See fig.25
Fig.25 – Position of displaced rings in 90º
After assembling of all rings in the chamber there should remain about 5 mm (3/16”) to gland cover guide.
7.5 Maintenance of wear areas
Maintenance of wear areas, that means, clearances between impeller (234) and casing wear ring (502) or between this and the
impeller wear ring (503) should be made after reaching sealing clearance values mentioned on table 1.
7.6 Instruction for Disassembly
Note: Part numbers indicated in parentheses after the name of each part refer to the parts lists and sectional drawings of
chapter 9.
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