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Impeller/Diffuser Cover Alignment
The following replacement items will be required as a result of compressor disassembly and diffuser
removal:
Table 5.2
PART DESCRIPTION
ITEM NUMBER
QUANTITY
Impeller Spacer
158C Series
AR
O-Ring Packing
936A
1
O-Ring Packing*
936C
1
O-Ring Packing
936E
1
O-Ring Packing
936F
1
O-Ring Packing
936G
1
*Required only if diffuser is removed.
Step 1
Remove impeller bolt (3), and impeller (2).
Step 2
Inspect impeller and procure a new one if required.
Step 3
Inspect diffuser for signs of damage (i.e. gouging in the bowl areas due to erosion or mechanical
damage)
Step 4
The impeller spacer (158C) is required to align the blade side of the impeller shroud flush with the
diffuser cover (15). The impeller spacer (158C) thickness (“D” dimension of
Figure 5.1)
must be
determined and the correct spacer installed during the replacement of any one of the following
components: gearbox assembly, gearbox high speed shaft (A130), or high speed shaft bearings
(151A or B), impeller (2), seal housing (30), diffuser cover (15).
NOTE:
The original clearances for your compressor as shipped from the factory for the impeller and
diffuser are recorded and supplied as part of the final data package.
Step 5
The Impeller to Diffuser Cover Alignment Procedure
Align the impeller (2) with the diffuser cover (15) as follows:
The Impeller to Diffuser Cover Alignment Procedure requires multiple assemblies of the stacked
rotating elements mounted on the end of the high speed shaft assembly. The procedure is attempted
after the gearbox is completely assembled with the shaft end play checked and within its specification
of 0.015” +/- 0.002”. This procedure also assumes that all components have been checked and are in
good order. If not, then new parts must be procured.
The 1st assembly includes only the mating rings, shaft sleeves, impeller spacer (158C), and impeller
(2) and is done without any o-rings, mechanical seal, seal housing (30) or diffuser cover (15). The
purpose of the 1st assembly is to ensure that all stacked components are compressed and fit tight
when the impeller is torqued to specification. A visual and physical check of these stacked
components is required to ensure that they cannot be spun in relation to the shaft.
The 2nd assembly requires that all components be installed, except the Item #936G O-Ring between
the impeller spacer (158C) and impeller (2). The purpose of this assembly is to check the impeller (2)
Summary of Contents for LMC 341F
Page 32: ...28 Figure 5 1 Compressor Cross Section and Clearances ...
Page 69: ...65 SINGLE SEAL ARRANGEMENT ...
Page 70: ...66 DOUBLE SEAL ARRANGEMENT ...
Page 71: ...67 TANDEM SEAL ARRANGEMENT ...
Page 73: ...69 Phoenix Compressor Gearbox Cross Sectional View ...
Page 74: ...70 ...
Page 75: ...71 PHOENIX GEARBOX MODULE DRAWING GB01AY01 ...
Page 76: ...72 ...
Page 77: ...73 ...
Page 78: ...74 ...
Page 79: ...75 ...
Page 80: ...76 ...
Page 81: ...77 ...