The calculations are based on the following table with measured figures for the pipe dimensions and Silvent’s air nozzles. The cost savings in the table are calculated assuming the cost of compressed air is $0.32 USD per 1,000 scf and the blowing time is 2 hours per day.
| Open pipe | ||
|---|---|---|
| Pipe interval | Noise Level | Air consumption |
| Ø | dB(A) | scfm |
| 5/64″ | 84 | 4.7 |
| 3/32″ | 87 | 7.1 |
| 1/8″ | 90 | 10 |
| 5/32″ | 95 | 17.7 |
| 3/16″ | 99 | 27.7 |
| 1/4″ | 102 | 39.5 |
| 9/32″ | 105 | 54.2 |
| 5/16″ | 108 | 69.5 |
| 3/8″ | 112 | 109 |
| 1/2″ | 116 | 156.7 |
| 9/16″ | 119 | 213.8 |
| 5/8″ | 122 | 279.2 |
| 11/16″ | 123 | 315.7 |
| 23/32″ | 124 | 352.8 |
| 3/4″ | 126 | 435.9 |
| 1″ | 131 | 682.7 |
| 1 1/2″ | 139 | 1576.8 |
| Silvent air nozzle | |||
|---|---|---|---|
| Replace with | Noise reduction | Air savings | Annual savings |
| dB(A) % | scfm % | USD | |
| MJ4 | 8 43% | 2.3 49% | 23 |
| MJ5 | 8 43% | 1.2 17% | 12 |
| MJ6 | 8 43% | 1.8 18% | 18 |
| X01 | 17 69% | 9.5 54% | 95 |
| 1011 | 15 65% | 12.4 45% | 124 |
| 9002W | 22 78% | 21.8 55% | 218 |
| 973 | 19 73% | 20.1 37% | 201 |
| X03 | 19 73% | 38.4 55% | 383 |
| 705 L | 19 73% | 53.1 49% | 530 |
| X07 | 20 75% | 86.1 55% | 860 |
| 710 L | 19 73% | 86.7 41% | 866 |
| 412 L | 34 89% | 159.1 57% | 1588 |
| 715 C | 23 80% | 132.7 42% | 1325 |
| 715 L | 20 75% | 169.2 48% | 1689 |
| 720 | 22 78% | 188.7 43% | 1884 |
| 735 L | 22 78% | 230.7 34% | 2303 |
| 780 LA | 20 75% | 546.8 35% | 5459 |
In the example below, we assume you have a Ø 1/4″ open pipe, the compressed air costs $0.32 USD per 1,000 scfm, and that you have a blowing time of 2 hours per day.
Blowing time per year:
52 weeks x 5 days x X hours/day
52 weeks x 5 days x 2 hours/day = 520 hours/year
Saved scf per year:
Air savings scfm x blowing time x 60
21.8 scfm x 520 h x 60 = 680 160 scf/year
Saved USD per year:
Air savings scfm x compressed air cost x blowing time x 60 / 1000
21.8 x 0.32 USD x 520 h x 60 / 1000 = 217.7 ~ 218 USD/year
Sound level reduction dB(A):
Sound level open pipe – sound level air nozzle
102 dB(A) – 80 dB(A) = 22 dB(A) sound level reduction
Please contact one of our representatives if you want help calculating your sound level reduction and energy savings, when replacing an open pipe. Our representatives have extensive experience and expertise in the subject.
