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Trouble Shooting - Compressors
Trouble Shooting - Compressors
CAUSE
Dirty Operating Conditions 1   1   6       3             5       M
Wrong Air Filter Element 6         8     13  

Numbers (1,2,3, Etc.) Suggest Order To Follow In Cause Trouble Shooting

        P
Defective Service Indicator 3                           P
Inadequate Element Cleaning 2               4           M
High Oil Level   1                                   M
Out Of Level > 15°   2     2                     7     3 O
Clogged Scavenge Orifice   3                                   M
Defective Separator Element   8       9   7 12                     P
Scavenge Tube Blocked   4                                   M
Defective Scavenge Check Valve   5                                   M
Defective Minimum Pressure Valve   7     14       11                     P
Contaminated Lube Oil     2                                 M
Malfunctioning Seal     6                                 P
Scored Shaft     7                                 P
Malfunctioning Inlet Unloader 5     3     5 6 9                     P
Incorrect Stopping Procedure 4     1                               O
Dirty Cooler         5                     6       M
Low Oil Level         3                           2 M
Clogged Oil Filter Elements         7                           5 M
Wrong Lube Oil     3   4                           4 L
Malfunctioning Thermostat         12                             P
Defective Oil Cooler Relief Valve         13                             P
Recirculation Of Cooling Air         10                     11       RA
Operating Pressure Too High     5   9 2   1 8             9       OA
Loose or Broken Belts         8             1   1   8       MP
Blocked Or Restricted Oil Lines     4   15                           6 -
Incorrect Linkage Adjustment           5     5                     A
Clogged Fuel Filters           1             5             EM
Incorrect Pressure Regulator Adjustment           3 3 3 6                     A
Ruptured Inlet Unloader Diaphragm       2     2 5                       P
Defective Discharge Air Temp Switch                   7 1   11             PM
Defective Engine Belt Break Switch                   8 2   12     3 4     PM
Defective Engine Oil Pressure Switch                   9 3   13         3   PM
Defective Shutdown Solenoid                   10 4   14             PM
Malfunctioning Relay                   11 5   15             PM
Loose Wire Connection                   6     10 2 2   2     WP
Blown Fuse                   1     3             P
Low Battery Voltage                         2 3           -
Malfunctioning Start Switch                         4             P
Defective Safety Bypass Switch                     6   16             P
<9 Volts At Shutdown Solenoid                   12     1             -
Malfunctioning Alternator                           1           P
Bulb Burnt Out                             1   1 1   P
Broken Engine Fan Belt                   4     8     1       M
Malfunctioning Circuit Board                           5 3 2 3 2   P
Ambient Temp > 125° (52°C)         1                     4       RA
Ice in Regulation Lines/Orifice           10 6 8 14                     RA
Sep. Tank Blown Down Too Quickly   6                                   O
Dirty Air Filter           6     1                     M
Malfunctioning Pressure Regulator           4 4 4 7                     P
Malfunctioning Air Cylinder           7     10                     P
Leaks in Regulator Piping             1 2 2                     -
Compressor Oil Temp. Too High                   3     7             TC
Engine Oil Pressure Too Low                   5     9           1 TC
Out Of Fuel                   2     6             -
Malfunctioning Fan         11             3       10       P
Rubber Mounts Damaged                       2               P
Engine Malfunctioning           11       13   5 17     12     7 EM
Drive Coupling Defective                       4               P
Airend Malfunctioning         16 12           6 18             P
Defective Safety Valve               9                       P
*M - Maintenance (5) O - Operating (4) RA - Review Application EM - Engine Manual TC - Trouble Complaint P - Parts (10) L - Lubrication (6) A - Adjustments (7) W - Wiring Diagram (10)

 

 

Abrasive Blasting Table
Grit Consumption/Air Requirements (Air Mixed with Grit)
 
Pressure at Nozzle (psi)
Nozzle Inside Orifice
 
60
70
80
90*
100*
120
140**
#3
3/16"
Air (CFM)
30
33
38
41
45
-
-
Lbs. Sands/Hour
171
196
216
238
264
-
-
#4
1/4"
Air (CFM)
54
61
68
74
81
97
111
Lbs. Sands/Hour
312
354
408
448
494
582
666
#5
5/16"
Air (CFM)
89
101
113
126
137
152
173
Lbs. Sands/Hour
534
604
672
740
812
912
1,038
#6
3/8"
Air (CFM)
126
143
161
173
196
220
249
Lbs. Sands/Hour
764
864
960
1,052
1,152
1,320
1,494
#7
7/16"
Air (CFM)
170
194
217
240
254
300
340
Lbs. Sands/Hour
1,032
1,176
1,312
1,448
1,584
1,800
2,040
#8
1/2"
Air (CFM)
224
252
280
309
338
392
443
Lbs. Sands/Hour
1,336
1,512
1,680
1,856
2,024
2,352
2,658
#10
5/8"
Air (CFM)
356
404
452
504
548
611
692
Lbs. Sands/Hour
2,136
2,424
2,712
3,024
3,288
3,666
4,152

* Most commonly used operating range.
** Optional 150-psi-rated tanks must be used at pressures above 125 psi.
Conversion Factor:
1 psi = 0.0703 kg/cm2
1 cfm = 0.472 1/sec

Nozzle wear - In a typical abrasive blast operation, blasters will allow the nozzles to wear approximately 1/8 of an inch. When this occurs, the consumption of that nozzle increases approximately 50-60 cfm. If you do not have ample capacity to serve that nozzle, a pressure drop will result. Pressure drops or pressure losses in the blasting system will result in a loss in productivity.

 

Pressure Loss in Hose Table

In determining the appropriate air compressor for specific applications, the pressure line loss must be taken into consideration. The following charts indicate the line loss for various hose sizes.

Lubrication Only at Tool - No Line Lubricator

Hose Length and
Inside Diameter
cfm Free Air
Line Pressure -psig
Metric
Imperial
60
80
100
120
150
200
300

15m

19mm

50 Feet

3/4"

60
80
100
120
140
160
180
200
220
3.1
5.3
8.1
2.4
4.2
6.4
9.0
12.0
2.0
3.5
5.2
7.4
9.9
12.7
2.9
4.5
6.3
8.4
10.8
13.6
16.6
2.4
3.6
5.1
6.9
8.9
11.1
13.5
16.2
1.8
2.8
3.9
5.3
6.8
8.5
10.4
12.4
1.2
1.9
2.7
3.6
4.6
5.8
7.1
8.4

15m

25mm

50 Feet

1"

120
150
180
210
240
270
300
330
360
390
420
450
2.7
4.1
5.8
7.7
2.1
3.2
4.6
6.1
7.9
9.8
12.0
2.7
3.8
5.0
6.5
8.1
9.9
11.8
13.9
2.3
3.2
4.3
5.5
6.9
8.4
10.0
11.9
13.8
15.9
2.6
3.5
4.5
5.6
6.9
8.2
9.7
11.3
13.0
14.8
2.0
2.7
3.4
4.3
5.3
6.3
7.4
8.7
10.0
11.4
1.3
1.8
2.3
2.9
3.6
4.3
5.0
5.9
6.8
7.7

15m

32mm

50 Feet

1 1/4"

200
250
300
350
400
450
500
550
600
650
700
750
800
2.4
3.7
5.2
7.0
8.9
2.9
4.1
5.5
7.0
8.8
10.8
2.4
3.4
4.5
5.8
7.3
8.9
10.7
12.6
14.6
2.0
2.9
3.8
4.9
6.2
7.6
9.1
10.7
12.4
14.3
2.3
3.1
4.0
5.0
6.2
7.4
8.7
10.2
11.7
13.3
15.0
1.8
2.4
3.1
3.9
4.7
5.7
6.7
7.8
9.0
10.2
11.5
1.2
1.6
2.1
2.6
3.2
3.9
4.6
5.3
6.1
6.9
7.8

15m

38mm

50 Feet

1 1/2"

300
400
500
600
700
800
900
1000
1100
1200
1300
2.1
3.7
5.6
8.0
2.9
4.4
6.3
8.5
10.9
2.4
3.7
5.2
7.0
9.0
11.2
13.6
2.0
3.1
4.4
5.9
7.7
9.5
11.6
14.0
2.5
3.6
4.9
6.3
7.8
9.5
11.4
13.6
15.8
1.9
2.8
3.7
4.8
6.0
7.3
8.8
10.4
12.1
1.3
1.9
2.5
3.2
4.1
4.9
6.0
7.1
8.3

15m

50mm

50 Feet

2"

600
800
1000
1200
1400
1600
1800
2000
2200
2400
2600
2800
1.9
3.2
5.0
7.0
9.3
2.5
3.9
5.5
7.4
9.6
12.1
2.1
3.2
4.5
6.1
7.9
9.9
12.2
14.6
2.7
3.8
5.2
6.7
8.4
10.4
12.5
14.7
2.2
3.1
4.2
5.5
6.9
8.5
10.2
12.0
14.1
16.2
1.7
2.4
3.2
4.2
5.3
6.5
7.8
9.2
10.8
12.4
1.1
1.6
2.2
2.8
3.6
4.4
5.3
6.3
7.3
8.5

15m

62.5mm

50 Feet

2 1/2"

1000
1500
2000
2500
3000
3500
4000
4500
1.7
3.7
6.5
10.0
2.9
5.1
7.9
11.2
2.4
4.2
6.5
9.3
12.4
2.0
3.6
5.5
7.9
10.6
13.7
2.9
4.5
6.4
8.7
11.2
14.0
2.2
3.4
4.9
6.6
8.6
10.7
1.5
2.3
3.3
4.5
5.8
7.3

15m

75mm

50 Feet

3"

2000
2500
3000
3500
4000
4500
5000
5500
6000
6500
7000
7500
2.5
3.9
5.5
7.5
9.8
2.0
3.0
4.4
5.9
7.6
9.6
11.7
2.5
3.6
4.9
6.3
7.9
9.6
11.5
13.6
2.1
3.1
4.1
5.3
6.7
8.2
9.8
11.5
13.5
15.6
2.5
3.4
4.4
5.5
6.7
8.0
9.4
11.0
12.7
14.5
1.9
2.6
3.3
4.2
5.1
6.1
7.2
8.4
9.8
11.1
1.3
1.7
2.3
2.8
3.5
4.2
4.9
5.7
6.6
7.6

7.5m

100mm

25 Feet

4"

5000
6000
7000
8000
9000
10000
11000
12000
13000
14000
15000
16000
17000
1.9
2.7
3.6
4.7
5.9
7.2
8.7
2.1
2.8
3.7
4.6
5.7
6.8
8.1
9.4
1.7
2.3
3.0
3.8
4.7
5.6
6.7
7.8
9.0
2.0
2.6
3.2
4.0
4.8
5.7
6.6
7.6
8.7
9.8
2.1
2.6
3.2
3.9
4.6
5.4
6.2
7.1
8.0
9.1
1.2
1.6
2.0
2.5
3.0
3.5
4.1
4.8
5.4
6.2
6.9

 

Typical Air Consumption for Tools Table
TOOL
MODEL
SIZE
AIR USAGE
Grinders
1 1/2 HP
4"
39 CFM @ 100 psi
2HP
6"
65 CFM @ 100 psi
3HP
8"
85 CFM @ 100 psi
Impact Wrenches
Automot.
3/8"
15 CFM @ 100psi
Automot.
1/2"
20 CFM @ 100psi
Industrial
3/4"
30 CFM @ 100psi
Industrial
1"
60 CFM @ 100psi
Industrial
1 1/2"
70 CFM @ 100psi
Industrial
2 1/2"
155 CFM @ 100psi
Industrial
3 1/2"
375 CFM @ 100psi
Sandblast Nozzles
#4
1/4"
90 CFM @ 100psi
#5
5/16"
150 CFM @ 100psi
#6
3/8"
200 CFM @ 100psi
#7
7/16"
260 CFM @ 100psi
#8
1/2"
350 CFM @ 100psi
#10
5/8"
520 CFM @ 100psi
Blower
-

60 CFM @ 100psi

Drifter
YD90
187 lb.
368 CFM @ 100psi
YL120
375 lb.
600 CFM @ 100psi
EVL130
478 lb.
600 CFM @ 100psi
VL140
430 lb.
750 CFM @ 100psi
VL671
525 lb.
900 CFM @ 100psi
DHD
DH4
77 lb.
190 CFM @ 100psi
DHD340A
85 lb.
400 CFM @ 100psi
DHD350R
151 lb.
760 CFM @ 100psi
DH5
140 lb.
330 CFM @ 100psi
SF6
215 lb.
325 CFM @ 100psi
DH6
222 lb.
480 CFM @ 100psi
DHD380
390 lb.
665 CFM @ 100psi
DHD112
1375 lb.
998 CFM @ 100psi
DHD124
6400 lb.
3000 CFM @ 100psi
DHD130
11300 lb.
3000 CFM @ 100psi