These
are used for the storage of pure breathing air used to fill Fire
Department self contained breathing apparatus referred to as SCBA.
Filling of the cascade storage is obtained from your pure breathing air
compressor. SCBA comes in two popular pressure ratings, 2216psi and
4500psi, and there is some manufacturers offering 5500psi units.
Cascade
storage systems come in three pressures as well: 4500psi, 5000psi and
6000psi. And it is recommended that your storage system has a higher
pressure than your SCBA pressures. If purchasing a new storage system it
is recommended you purchase the 6000psi system so you are ready for any
upgrades in your compressor or SCBA in the future. This allows you to
fill from the lowest pressure cascade bottle and by leveling out the
pressure in your SCBA’s you close and open the next highest cascade
bottle until your SCBA’s are topped off to the correct full pressure.
These pre-packaged systems do not come with the regulator, wall bracket or fill whips as
most departments have a NFPA approved fragmentation or fill station to
protect the fire fighter during the refilling of their SCBA in case of a
failure and only require a high pressure hose to supply the air from
the compressor to the storage bank and from this bank to the fill
station and these are made to each departments requirements.
Please
note that the systems below are examples and there is no limit to how
many storage bottles you can have on your cascade system.
We
have also included a chart below to give you an example of how many
fills you can obtain from your storage system before you need to rely on
your compressor to top up your SCBA. As you can see storage is critical
during an emergency on how may SCBA bottles you will be able to fill.
We have eliminated the part of the chart which shows bulk fills as this
is not an efficient way to use your air storage.
Fills from Storage
Instructions:
- Select the type of BA cylinder to be filled from top of the chart.
- Find the fill method and desired number of storage vessels in the left column.
- Select the starting pressure of DOT storage, either 5,000 or 6,000 psi.
- Intersect the cylinder type with the number of storage vessels to determine number of cylinder fills and RF. Residual Factor (RF) represents
residual storage volume which may be utilized in conjunction with a
compressor to fill BA cylinders when storage pressure alone is
insufficient to fill the cylinders to capacity. By adding compressor
cylinders filled per hour, cylinders filled from storage, and RF the
maximum number of cylinders filled from a complete air system may be
determined.
| | 2216 PSI (45CF) 30 min. | 4500 PSI (88CF) 30 min. | 4500 PSI (88CF) 1 hr. |
Fill Method/Vessel | Start PSI | Fills | RF | Fills | RF | Fills | RF |
---|
Cascade 2 | 5000 | 15 | 4 | 5 | 13 | 2 | 8 |
6000 | 18 | 4 | 8 | 12 | 4 | 6 |
Cascade 3 | 5000 | 25 | 4 | 9 | 17 | 4 | 10 |
6000 | 30 | 4 | 15 | 13 | 7 | 7 |
Cascade 4 | 5000 | 35 | 4 | 15 | 19 | 7 | 10 |
6000 | 42 | 4 | 2 | 15 | 10 | 8 |