Amico NFPA Triplex SCD Modular Stack Mount User Manual
Page 8
Amico Source Equipments
Figure 3: Altitude Compensation Chart
6.3.5 “Future expansion” Compensation
The notion of adding capacity now for any future requirements is wise, but extreme caution IS also advised. It
is common to see very badly oversized air plants which were initially sized to accommodate an expansion that
never occurred or that was scaled back and was not compulsory after all. In addition to the waste of investment, it
generates problems associated with the operation of the system. The best method in preparing for an anticipated
expansion is to opt for a plant which is adequate for the present need in a duplex or triplex system but can also
be upsized for future need by simply adding additional compressors as required. When specifying for the unit,
require it be purchased in preparation for additional compressor(s) yet not populated with those compressors. A
representative specification would read: “provide duplex medical air plant with triplex controls and air treatment
subsystem ready for a future third compressor”. Such a system provides an effective method of expanding the system
capacity, is more capital-efficient, and yields better operating characteristics and reliability when it comes to air
quality control. Nevertheless, it is fundamentally important that the intake, electrical service, and system piping are
correctly sized for the entire expected capacity, so these larger values should be used in all calculations.
6.3.6 Plant Selection
1.
Select a preferred technology (See Sec 6.3.9). More specific assistance in selecting a technology may be
obtained by contacting your Local Amico Source representative.
2.
Choose a Horsepower from the preferred technology with the capacity closest to (but typically greater than)
the Peak Calculated Load (PCL).
3.
Note that for some technologies, there is more than one plant architecture. Should one or more layout be
available for selection, choose the one best suited to the site conditions. If in doubt as to which arrangement
is most suitable for a particular situation, contact your Local Amico Source representative for assistance.
4.
Reference the Technology Comparison Chart for the particular system selected. This sheet entails all the
essential information regarding the system and should be utilized as a quick reference in all of the following
steps.
6
Altitude
Multiplier Used for Required SCFM(Hg)
Sea Level
1.00
2000 ft. (609 m)
1.03
4000 ft. (1219m)
1.06
6000 ft. (1828 m)
1.10
8000 ft. (2438 m)
1.15
10,000 ft. (3048 m)
1.19
1000 ft. (305 m)
1.01
3000 ft. (900 m)
1.05
5000 ft. (1525 m)
1.08
7000
ft.
(2133
m) 1.12
9000 ft. (2743 m)
1.17