For Cost Effective Operation
STANDARD STORAGE RESERVOIR
Should an application require the use of storage, a properly sized air storage system offers many benefits to a high pressure compressed air system. Each high pressure compressed air application must be reviewed carefully to determine the best type and size of storage. By engineering the compressor and storage as a complete system, the cost of equipment and the operational and maintenance costs can be reduced.
The main purpose of a storage system is to serve as an air reservoir to handle constant, sudden or unusually high demands for air which can exceed the compressor’s capacity. Storage protects the compressor from the direct demands of the system and prevents short cycling of the compressor and motor. Thus, the compressor works consistently within a certain pressure range provided the compressor and storage system have been sized correctly for the application. Storage will also dampen or eliminate pressure pulsations from the compressor’s discharge line and from the system, thus protecting the compressor and the system from potential damage. Storage can precipitate some of the moisture from the compressed air that may be carried over from the compressor’s aftercooler or a defective separator or dryer.
The size of the storage system required for a particular application will depend upon:
- Consumption rate of the system
- Capacity of the compressor/booster
- Deadband of the compressor’s final pressure switch
BAUER recommends that the compressor does not start more than 4 times per hour. Thus the compressor can operate long enough during each load cycle to allow it to attain normal working temperature. If the compressor is allowed to short cycle, moisture can precipitate out of the compressed air inside of the compressor and emulsify the oil.
Buffer storage can be sized by the following formula:
VR = 58 × (QC / ΔP)
| VR | = | Volume of storage in cubic feet water volume |
| QC | = | Capacity of compressor in standard cubic feet per minute (scfm) |
| ΔP | = | Deadband of final pressure switch in pounds per square inch (psid) |
Multiple receivers can be used for applications that require a large volume of storage.
The chart summarizes the deadband of the compressor’s final pressure switch for the various pressure ranges covered by BAUER Industrial Compressors.
BAUER offers storage systems that meet the code requirements of the American Society of Mechanical Engineers (ASME) and the Department of Transportation (DOT).
Consult BAUER for storage with multiple banks.
| Working Pressure (PSIG) | ΔP (PSID) |
|---|---|
| 500 | 125 |
| 1000 | 150 |
| 5000 | 500 |
| 6000 | 600 |
| All values are approximate. | |
The chart below lists recommended water volumes for buffer storage with respect to compressor capacity, working pressure and the deadband of the final pressure switch.
| Compressor Capacity - SCFM | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 | 150 | 200 | 250 | |||||
| Storage Water Volume - SCF | |||||||||||||||||
 |
500 |  |
125 | Calculated Volume |
4.6 | 9.3 | 13.9 | 18.6 | 23.2 | 27.8 | 32.5 | 37.1 | 41.8 | 46.4 | 69.6 | 92.8 | 116.0 |
| 1000 | 150 | Calculated Volume |
3.9 | 7.7 | 11.6 | 15.5 | 19.3 | 23.2 | 27.1 | 30.9 | 34.8 | 38.7 | 58.0 | 77.3 | 97.0 | ||
| 5000 | 750 | Calculated Volume |
0.8 | 1.5 | 2.3 | 3.1 | 3.9 | 4.6 | 5.4 | 6.2 | 7.0 | 7.7 | -- | -- | -- | ||
| 6000 | 900 | Calculated Volume |
0.6 | 1.3 | 1.9 | 2.6 | 3.2 | 3.9 | 4.5 | 5.2 | 5.8 | 6.4 | -- | -- | -- | ||
This chart is for reference only. Intermittent periods of high system demand may require additional storage volume. Consult BAUER to confirm your storage volume requirements.
Technical Data for Typical Air Receivers
| Working Pressure PSIG |
Water Volume SCF |
Water Volume Gallons |
Capacity @ max. Pressure SCF |
Dimensions Ø - Length INCH |
Weight LBS |
|
|---|---|---|---|---|---|---|
| All values are approximate and subject to change. Weight is for empty receiver. | ||||||
| ASME Receivers |  |
|||||
| 500 | 9.8 | 73 | 345 | 18 - 72 | 450 | |
| 500 | 17.4 | 130 | 610 | 24 - 72 | 650 | |
| 500 | 32.1 | 240 | 1130 | 30 - 84 | 1250 | |
| 500 | 53.5 | 400 | 1880 | 36 - 98 | 1975 | |
| 500 | 86.9 | 650 | 3060 | 42 - 120 | 3750 | |
| 1000 | 9.8 | 73 | 680 | 18 - 72 | 750 | |
| 1000 | 32.1 | 240 | 2240 | 30 - 84 | 2380 | |
| Dimensions are for bare receiver only, excludes legs or skirt and saddle. | ||||||
| ASME Receivers |  |
|||||
| 5000 | 1.47 | 11 | 436 | 9 9/16 - 54 | 400 | |
| 6000 | 1.47 | 11 | 491 | 9 9/16 - 54 | 400 | |
| 7000 | 1.47 | 11 | 537 | 9 9/16 - 54 | 400 | |
| Dimensions are for bare receiver only. | ||||||
| DOT Receivers |  |
|||||
| 4500 | 1.59 | 11.9 | 444 | 9 5/16 - 55 | 145 | |
| 5000 | 1.59 | 11.9 | 472 | 9 3/8 - 56 | 160 | |
| 6000 | 1.53 | 11.4 | 509 | 9 9/32 - 55 | 190 | |
| Dimension includes shutoff valve. | ||||||
Technical Data for Gases at Pressure
The table below lists the volume of different gases that can be compressed into one (1) cubic foot water volume at the given pressure. The information is based on 70 ºF and accounts for the compressibility of the gas. The table can be used to calculate the volume of air or gas that can be stored in a cylinder of known water volume. Likewise, the water volume of a cylinder can be calculated if the capacity of air or gas stored in the cylinder is known.
| Gauge Pressure | Air | Nitrogen | Argon | Helium | |||||
|---|---|---|---|---|---|---|---|---|---|
| psig | bar | scf | m3 | scf | m3 | scf | m3 | scf | m3 |
| 1000 | 69 | 70.29 | 1.99 | 69.30 | 1.96 | 71.79 | 2.03 | 66.37 | 1.88 |
| 1500 | 103.4 | 104.77 | 2.97 | 102.74 | 2.91 | 108.50 | 3.07 | 98.12 | 2.78 |
| 2000 | 137.9 | 137.77 | 3.9 | 134.90 | 3.82 | 145.30 | 4.11 | 128.55 | 3.64 |
| 2500 | 172.4 | 169.11 | 4.79 | 165.39 | 4.68 | 181.50 | 5.14 | 158.08 | 4.48 |
| 3000 | 206.9 | 198.96 | 5.63 | 193.82 | 5.49 | 216.30 | 6.13 | 186.78 | 5.29 |
| 3500 | 241.4 | 226.14 | 6.4 | 220.26 | 6.24 | 249.20 | 7.06 | 214.66 | 6.08 |
| 4000 | 275.9 | 251.34 | 7.12 | 244.39 | 6.92 | 279.90 | 7.93 | 241.79 | 6.85 |
| 4500 | 310.3 | 274.85 | 7.78 | 266.60 | 7.55 | 308.30 | 8.73 | 268.19 | 7.6 |
| 5000 | 344.8 | 296.57 | 8.4 | 286.67 | 8.12 | 334.40 | 9.47 | 293.90 | 8.32 |
| 5500 | 379.3 | 316.03 | 8.95 | 305.80 | 8.66 | 358.40 | 10.15 | 318.95 | 9.03 |
| 6000 | 413.8 | 334.06 | 9.46 | 322.77 | 9.14 | 380.30 | 10.77 | 343.37 | 9.72 |
