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Dresser Roots
Troubleshooting Checklist
Trouble
Item
Possible Cause
Remedy
No Flow
1
2
3
Speed too low
Wrong Rotation
Obstruction in piping
Check by tachometer and compare with speed on Roots Order Acknowledgment
Compare actual rotation with Figure 4 or 5. Change driver if wrong.
Check piping, screen, valves, silencer, to assure open flow path.
Low Capacity
4
5
6
7
Speed too low
Excessive pressure rise
Obstruction in piping
Excessive slip
See item 1. If belt drive, check for slippage and readjust tension.
Check inlet vacuum and discharge pressure, and compare these figures with
specified operating conditions on order.
See item 3.
Check inside of casing for worn or eroded surfaces causing excessive clearances
Excessive Power
8
9
10
Speed too high
Excessive pressure rise
Impellers rubbing
Check speed and compare with Roots Order Acknowledgement.
See item 3.
Inspect outside of cylinder for high temperature areas, then check for impeller
contact at these points. Look for excessive scale build-up. Correct blower
mounting, drive alignment.
Overheating of
Bearings of Gears
11
12
13
14
15
Inadequate lubrication
Excessive lubrication
Excessive pressure rise
Coupling misalignment
Excessive belt tension
Check oil sump levels in gearhouse and drive end covers.
Check oil levels. If incorrect, drain and refill with oil of recommended grade.
See item 5.
Check carefully. Realign if questionable.
Readjust for correct tension.
Vibration - Refer to
“Rotary Lobe Blower
Vibrations”
16
17
18
19
20
21
Misalignment
Impellers rubbing
Worn bearings/gears
Unbalanced or rubbing
impellers
Driver or blower loose
Piping resonances
See item 14.
See item 10.
Check gear backlash and condition of bearings, and replace as indicated.
Scale or process material may build up on casing and impellers, or inside impel-
lers. Remove build-up to restore original clearances and impeller balance.
Tighten mounting bolts securely.
Determine whether standing wave pressure pulsations are present in the piping.
Refer to Sales Office.
Summary of Contents for Roots DVJ WHISPAIR
Page 22: ...DVJ WHISPAIR Dry Exhauster 23 Figure 15 Assembly of 10 thru 12 DVJ V V Belt Drive Splash Lube ...
Page 23: ...24 Dresser Roots Figure 16 Sectional Assembly of 10 thru 14 DVJ V Blowers ...
Page 24: ...DVJ WHISPAIR Dry Exhauster 25 Figure 17 Sectional Assembly of 16 20 DVJ Common Lube ...
Page 25: ...26 Dresser Roots Figure 18 Sectional Assembly of 1016 DVJ V Units ...
