Operating instructions

MAINTENANCE
31 Dec 13 5-13
DE-7200VFDCentrifuge
10. Attach a hoist capable of lifting at least 4000 lbs (1800 kg) to rotating assembly.
11. Properly balance the hoisting straps to ensure that the assembly remains horizontal during
lifting, and slowly hoist rotating assembly until clear of base.
12. Lower rotating assembly onto a cradle that is capable of supporting its weight.
Figure 5-6. Bearing Pillow Block
Cleaning and Inspection
1. Wash mud and debris from interior and exterior of bowl assembly, and blow dry with filtered
compressed air. Remove any corrosion to facilitate inspection.
2. Inspect wear inserts for obvious wear. If significant damage is found, replace inserts using Kit
G0009149. To help preserve dynamic balance, inserts are always replaced in pairs that are
opposite to each other.
3. Inspect solid discharge wear inserts and weir plates on head wall of bowl assembly for cracks,
fractures, or other damage, and replace if obviously damaged using Kit G0009149.
4. Inspect bowl exterior for corrosion, excessive wear, or other damage that may affect
performance. Contact Derrick if excessive corrosion or wear is found.
5. Check main bearings for roughness, noise, or rubbing. If bearing damage is found, replace
rotating assembly in accordance with procedures in this section. Return defective rotating
assembly to Derrick for overhaul.
6. Inspect pillow blocks for corrosion, distortion, nicks, cracks, burrs, fractures, or other defects.
Repair any minor defects, or replace if serious defects or cracks are found.
7. Determine wear of conveyor flights as follows:
a. Remove inspection plug from bowl extension, and insert vernier caliper through hole and
into contact with conveyor flight (Figure 5-9).
b. The dimension indicates the radial wear of the flights. For example, a dimension of
24.2mm indicates radial wear of 5mm.
c. If radial wear exceeds 6mm, the rotating assembly should be returned to Derrick for
overhaul.