Compressed Air
The following table may be used as a general guide for selecting the compressed air pipe size, based on a compressor discharge pressure of 100 psig and a maximum 5% pressure drop. Equivalent length is to comprise the straight runs plus the sum of the equivalent pipe lengths of all fittings.
Flow rate
(SCFM)
|
Equivalent length
| ||||
100 ft
|
300 ft
|
500 ft
|
1000 ft
|
1500 ft
| |
< 50
|
1”
|
1½”
|
1½”
|
1½”
|
1½”
|
50-100
|
1½”
|
1½”
|
1½”
|
2”
|
2”
|
100-150
|
1½”
|
2”
|
2”
|
2½”
|
2½”
|
150-200
|
1½”
|
2”
|
2”
|
2½”
|
3”
|
200-250
|
2”
|
2”
|
2½”
|
3”
|
3”
|
250-300
|
2”
|
2½”
|
2½”
|
3”
|
3”
|
The compressed air must be clean, dry and oil-free. Particulates in the compressed air can wear out the bags from the insides due to the high-velocity air pulse. Condensation in the pipeline may freeze in extreme winter conditions and can, along with oil, contribute to bag blinding. The quality of the compressed air in the headers must meet or exceed the following:
Dew Point: 20 ºF below the minimum ambient temperature, or 35 ºF, whichever is lower.
Particulate size: 3 microns max.
Oil concentration: < 1 PPM
BCE recommends that you contact your air compressor supplier for the proper particle, moisture and oil filters to be included in the air line to meet these requirements.
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