Circor IMO CFHN Series, Руководство по обслуживанию изделия

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H.1 – GENERAL COMMENTS
Part number identifiers (POSITION NUMBERS / POS. NO.’s) within parenthesis such as (8) refer to circled numbers
shown on assembly drawings, Figures 4, 5 and 6.
NOTE: If upon disassembly, significant wear on power or idler rotors or rotor housing is found, Imo Pump
recommends replacement of entire pump
.
H.2 – TOOLS REQUIRED
Procedures described in this manual require common mechanics hand tools, arbor press, torque wrench and
suitable lifting device such as sling for smaller pumps or strap for larger models.
H.3 – PUMP DISASSEMBLY
Perform the following steps before disassembling pump:
a) If pump is driven by an electric motor, de-energize and lock out power to driver and tag power control
box
“ WARNING - Out of Service ”. Proceed similarly for other type drivers.
b) Close all inlet and outlet valves and tag valves “ WARNING - Out of Service ”.
c) Vent pressure in pump and drain pumped liquid.
d) Remove pipe fittings/flanges at pump inlet and outlet openings.
e) Remove bolts holding pump to its mounting.
f) Remove coupling hub and key (13) from power rotor (7) shaft and place pump on suitable workbench.
NOTE: CFHN Series pumps incorporate highly finished precision parts that must be handled carefully to avoid
damaging critical machined surfaces. Removed parts should be tagged for identification and their exact
positions in pump should be noted so new and removed parts can be properly replaced.
CAUTION
When removing inboard cover (4) from pump, DO NOT pull out power rotor (7) and idler rotors (8) at same time
since they may drop out and be damaged. If rotors start to come out, hold them in place.
1. Remove inboard cover (4) from pump housing (1) after first removing bolts (3 or 6) from cover (4).
2. Remove O-ring (31) and stationary seat (see Figures 2 and 3) of seal (16) from inboard cover (4).
CAUTION
In next step, rotors will be removed from pump. They will come out as a unit. Use care to support rotor set as it is
withdrawn from housing so idlers will not be dropped on floor.
3. Remove rotor set, power rotor (7) and two idler rotors (8), from pump by grasping and gently pulling on drive shaft
end of power rotor (7). When ends of idler rotors (8) clear discharge end of housing (1), hold all 3 rotors together
and ease out as an assembly. Once rotor assembly is removed, disengage both idler rotors (8) and set aside.
4. Mechanical Seal Removal - See Figures 2 and 3 below.
a. For Elastomer Bellows Type – Figure 2 – Slide rotating assembly off power rotor (7).
b. For Metal Bellows Type Seals – Figure 3 – Loosen set screw(s) at least 2 turns and slide rotating assembly
from power rotor
NOTE:

If only replacing seal, skip to Steps 3 through 10 in PUMP ASSEMBLY / REASSEMBLY section below to
install new seal and complete pump reassembly.

If remainder of pump needs to be disassembled, proceed with Step 5 immediately below.
WARNING
Fluid leakage may make floor slippery and cause personal injury when pump is removed from system or when it
is disassembled.