Page 155 - Improving Machinery Reliability

Machinery Relicibility Adits and Reviews 127

5. Journal-bearing assembly drawing and bill of materials
Bearing dimensions are required to calculate bearing loading and rotor
dynamic behavior, and for maintenance records.
6. Seal assembly drawing and bill of materials
These are required to compare seal dimensions, clearances, and tolerances
with similar data from seals operating properly under essentially identical
operating conditions.
7. Coupling assembly drawing and bill of materials
These are used for calculations verifying load-carrying capacity, mass
moment of inertia, overhung weight, shaft-fit criteria, dimensional compatibil-
ity between driver and driven equipment, material selection, match-marking,
assembly and disassembly provisions, and spare parts availability.
8. Seal oil or seal gas schematic, including:
a. Steady-state and transient gas or oil flows and pressures
b. Control, alarm, and trip settings
c. Heat loads
d. Utility requirements including electrical, water, and air
e. Pipe and valve sizes
f. Bill of materials
Oil or gas flows and pressures must change as a function of gas-pressure
and compressor-speed changes. The review must verify that the seal gas or
seal oil supply can accommodate all anticipated requirements for a given com-
pressor. This would include operation during run-in on air.
Control, alarm, and trip settings are required for operating and maintenance
manuals, as well as for initial field implementation by the contractor.
Heat loads are required for capacity checks on oil coolers.
Utilities requirements are required for proper sizing of switchgear, steam
lines, eic.
Pipe and valve sizes are employed in calculations verifying that maximum
acceptable flow velocities are not needed.
9. Seal oil or seal gas assembly drawings and list of connections
These are required for contractor’s (purchaser’s) connecting design.
10. Seal oil or seal gas component drawings and data, including:
a. Pumps and drivers, or motive gas suppliers:
1. Certified dimensional outline drawing
2. Cross section and bill of materials
3. Mechanical seal drawing and bill of materials
4. Priced spare parts list and recommendations
5. Instruction and operating manuals
6. Completed data forms for pumps and drivers
b. Overhead tank, reservoir, and drain tanks:
I. Fabrication drawings
2. Maximum, minimum, and normal liquid levels
3. Design calculation