Graham Corporation
25
Section 6 - Disassembly And Reassembly Procedures
6.1 General
Complete disassembly of the pump is seldom necessary and it may only need to be disassembled
to the point required to repair or service it. Specific instructions are included with the
documentation sent with your liquid ring pump. The cross-section drawing and parts list should
be referred to when servicing the pump and when ordering spare parts.
Before any servicing takes place, it is recommended that a set of gaskets, bearings, and gland
packings or mechanical seals be on hand as spare parts. The stocking of additional items
beyond these basic wearing parts is dependent upon the type of application, compatibility of
pump materials with the process gas and service liquid, degree of corrosion and erosion to
which the pump is subjected, importance of pump reliability to the process, etc.
When ordering spare parts, be sure to identify the pump size, serial number, part name and
reference number, and if available, original purchase order number, Graham job number, or a
drawing number.
6.2 Impeller End Clearances
Refer to Table 4 for the impeller end clearances. These values are for each side of the impeller
in each stage. These clearances are extremely important for optimum pump performance. Also
refer to the dismantling and reassembly procedures that were provided with the documentation
sent with your pump.
Impeller End Clearances *
Pump
Frame
Size
Cast Iron, Ductile Iron, Bronze,
Carbon Steel, Ni-Alum.-Bronze
Construction
Stain. Stl., Titanium, Alloy 20
Monel, Hastelloy
Construction
30000 0.004"-0.006" 0.006"-0.009"
40000 0.004"-0.006" 0.006"-0.009"
50000 0.006"-0.008" 0.009"-0.012"
60000 0.008"-0.010" 0.012"-0.015"
70000 0.010"-0.014" 0.014"-0.018"
80000 0.012"-0.016" 0.016"-0.020"
90000 0.012"-0.016" 0.016"-0.020"
* For units in mm, multiply inches by 25.4
Table 4
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