Amico NFPA Triplex RVL Modular Stack Mount - Manual (Page 7)

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When specifying the unit, require it be purchased in preparation for the additional pump(s) yet not populated with
those pumps. A representative specification would read:
“provide duplex vacuum plant with triplex controls ready
for a future third pump”. Such a system provides an effective method of expanding system capacity, is more capital-
efficient and ensures better operating characteristics and reliability. Nevertheless, it is essentially important that the
intake, electrical services and system piping are correctly sized for the entire expected capacity, so these larger values
should be used in all calculations.
7.3.6 Plant Selection
1. Select a preferred technology (See Sec. 7.3.9). 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 nearest to (but
typically greater than) the Peak Calculated Demand (PCD).
3. Note that for some technologies, there is more than one plant architecture. Should one or more
architecture be available for selection, choose the one best suited to the site condition. 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 the
following steps.
7.3.7 General Layout
1. Place the plant in scale on the plan drawings in the designated location. Ensure that the plant has
sufficient space on all sides for maintenance access and proper ventilation. In front, the control
cabinet must have 3 ft (0.92m) clearance, and Amico Source recommends 2ft (0.61m) minimum
clearance all around. It is sometimes possible to reduce this clearance with exact
knowledge of maintenance access requirements. Consult with your Local Amico Source
representative if circumstances allow less space.
2. Place the equipment in elevation views as appropriate.
3. On the plans, finalize the routing for the exhaust.
4. Size the exhaust piping. The sizing process is iterative:
a. Start with the total actual length of piping and make an estimate for the line size.
b. By using your estimated size, add equivalent lengths for the fittings employed.
c. Check the size of the intake piping is still acceptable at the new equivalent length. If not,
re- estimate the next larger size and repeat the steps above. The line may also be more
accurately sized by actual calculation. Intake piping must be sized to induce no more
than 4 inches (100 mm) water column backpressure at the pump outlet when all pumps
are running. (Use total capacity for this calculation NOT NFPA capacity). For unusual
lengths or other circumstances, contact your Local Amico Source representative for assistance.
5. Finalize the connection to the distribution piping and size the system piping.
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