29
NOTE:
The shim spacers are available in sets of five, including one each of:
Table 5.4
0.005 inch (0.13 mm)
0.010 inch (0.25 mm)
0.015 inch (0.38 mm)
0.020 inch (0.51 mm)
0.030 inch (0.76 mm)
Step 7
Install the spacers (158A) in compressor case (1).
Step 8
Install O-Ring (936C) on the diffuser (13).
Step 9
Install diffuser in compressor case and tighten the three screws (906D) per torque Table 8.1.
NOTE:
If a PTFE O-Ring (936C) was installed, perform the following steps, (10) through (14) prior to
final assembly of the compressor casing to the seal housing (30). If an elastomer O-Ring was
used, proceed to Step 15.
Step 10
Place casing (1), with diffuser (13) installed, on solid work surface.
Step 11
Place three of the compressor casing attaching hex nuts (914A) or other suitable spacers on upper
surface of diffuser.
Step 12
Lower the gearbox assembly onto the hex nuts. Install four of the compressor casing nuts (914A) and
tighten. This step is necessary to compress the PTFE O-Ring (935C) and maintain the proper final
impeller-to diffuser clearance.
Step 13
Remove the gearbox assembly from the case and remove the hex nuts that were used as spacers.
Retorque three screws (906D) to proper torque values.
Step 14
Reassemble the compressor with another solder ring and recheck the impeller clearance.
Step 15
Record the new diffuser spacers (158A) thickness (“B” dimension) and the impeller to diffuser
clearance (“A”) dimension in (Figure 5.1). Remove the compressor assembly from the compressor
case and place short strips or coils of electrical solder taped out on the flat portion of the diffuser.
Step 16
Reinstall the compressor assembly and retighten the case nuts. Loosen the nuts and remove the
assembly. Measure the solder at the flattened portion and record the diffuser to cover clearance
(“C” dimension) in (Figure 5.1). This dimension must be within 10% of the as shipped “C” dimension
as shown in the final data package.
To Next Page
Loading...