070.250-IOM1 (NOV 2013)
Page 20
TDS_ Rotary Screw Compressor
Maintenance
Recommended maintenance program
In order to obtain maximum compressor performance
and ensure reliable operation, a regular maintenance
program should be followed. The compressor unit should
be checked regularly for leaks, abnormal vibration, noise,
and proper operation. A log should also be maintained.
Oil analysis should be performed on a regular basis. It is a
valuable tool that can identify the presence of moisture,
acid, metallics and other contaminants that will shorten
compressor life if not corrected. In addition, an analysis of
the compressor vibration should be made periodically.
Vibration analysis
Periodic vibration analysis can be useful in detecting
bearing wear and other mechanical failures. If vibration
analysis is used as a part of your preventive maintenance
program, take the following guidelines into consideration.
Maintenance schedule
This schedule should be followed to ensure trouble-free operation of the compressor unit.
Frequency or hours of operation (maximum)
Maintenance
200
1000
5000
8000
10,000
15,000
20,000
25,000
30,000
35,000
40,000
45,000
50,000
55,000
60,000
65,000
70,000
75,000
80,000
85,000
90,000
95,000
Change oil As directed by oil analysis
Oil analysis
n
Every 6 months
Replace lters
n
n
n
n
n
n
n
n
n
n
n
Clean oil strainers
n
n
n
n
n
n
n
n
n
n
n
Clean liquid strainers
n
n
n
n
n
n
n
n
n
n
n
Replace coalescers
n
n
n
Check and clean suction strainer
n n n
n
n
n
n
n
n
n
n
n
Check alignment
n
n
n
n
n
n
n
n
n
n
n
Check coupling (b)
n
n
n
n
n
n
n
n
n
n
n
Suction and disch. ange bolts (c)
n n n n n n n n n n n n n n n n n n n n n n
Vibration analysis (c)
n
Every 6 months, more frequently if levels increase
Replace shaft seal When Leak rate exceeds 7 to 8 drops per minute
a. Check bolts, shim packs, center inserts, keys, and all bolt torques.
b.Verifytightnessofboltsonsuctionanddischargeanges.SeeTable 5 below for torque requirements.
c. Vibration measurement must be carried out continuously to obtain optimum preventative control on bearings. If not continuously
controlled, then every 6 months, more frequently if levels increase.
Note: Thebolttorquerequirementsforthecompressorangetoseparatorangearebasedon:
• Gaskets: Garlock
®
Blue-Gard
®
3300
• Bolts: class 8.8 or stronger hex head bolts, lightly oiled and clean
Table 5: TDSH ange bolt torque
TDS_ compressor model
Discharge ange to separator ange Suction ange
Bolt size (in.) Torque (ft-lb) Bolt size (in.) Torque (ft-lb)
163S M20 X 2.5 100 M16 X 2.0 120
163L M20 X 2.5 100 M16 X 2.0 120
193S M20 X 2.5 140 M20 X 2.5 180
193L M20 X 2.5 140 M20 X 2.5 160
233S M20 X 2.5 160 M20 X 2.5 160
233L M20 X 2.5 160 M20 X 2.5 200
233XL M20 X 2.5 160 M22 X 2.5 220
283S M22 X 2.5 230 M22 X 2.5 220
283L M22 X 2.5 230 M22 X 2.5 220
283SX M22 X 2.5 230 M24 X 3.0 220
355_
M24 X 3.0 240 M30 X 3.5 350
1. Always take vibration readings from exactly the same
places and at exactly the same percentage of load.
2. Use vibration readings taken from the new unit at
start-up as the baseline reference.
3. Evaluate vibration readings carefully as the instrument
range and function used can vary. Findings can be easily
misinterpreted.
4. Vibrationreadingscanbeinuencedbyotherequip-
ment operating in the vicinity or connected to the same
piping as the unit.
Oil quality and analysis
High quality and suitable oil is necessary to ensure com-
pressor longevity and reliability. Oil quality will rapidly de-
teriorate in systems containing moisture and air or other
contaminants. In order to ensure the quality of the oil in
the compressor unit:
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