Calculating Pipe Diameter - PREVOST PPS1 CI16 Documentación Técnica

GB
FIELDS OF USE
System PPS is designed to convey compressed air at pressures of up to
16 bar at 20°C.
The range consists of components for building complete systems, from
compressors and treatment to points of use.
System PPS is fully compatible with all PREVOST product ranges.
EFFECTS OF TEMPERATURE ON PRESSURE
System PPS components can be used at a constant pressure of 16 bar.
As shown in the graph below, the operating pressure drops as the ambient
temperature rises.
PN
16
14
12
10
8
6
4 Ø 16 mm -> Ø 80 mm
2
0
-10 0 10 20 30 40 50 60
The table below can be used to define the pipe diameter (in mm) as a function of the total pipe length and the flow rate* (m
COMPRESSOR*
POWER
kW CV Nm /h
3
2,2 3 22
3 4 30
4 5 40
5,5 7,5 50
7,5 10 70
11 15 100
15 20 150
18 25 180
22 30 220
26 35 260
30 40 350
37 50 370
45 60 500
55 75 550
75 100 750
90 125 1000
110 150 1100
132 175 1500
160 215 1750
200 270 2000
Several factors can cause losses in pressure:
- Surface conditions.
- Changes in directions and curves.

CALCULATING PIPE DIAMETER

70 80 90 100 110 120 °C
FLOW 50 m
Nl/min Scfm 164 ft
367 13 16
500 18 16
668 24 20
833 29 20
1167 41 20
1667 59 25
2500 88 25
3000 106 32
3674 130 32
4167 147 32
5833 206 40
6179 218 40
8350 294 50
9185 324 50
12500 441 63
16667 589 63
18370 649 63
25000 883 63
29167 1030 63
33333 1177 80
SIZING
The main network should form a loop.
Install the main pipe with a 1 % slope to enable condensates to drain
toward low points. The main pipe must be large enough to carry the entire
flow of the compressor.
The main pipe must be large enough to handle maximum flow rates
required for the service pressure and avoid pressure drops, which are a
waste of energy.
The maximum amount of air required for each downpipe depends on the
peak consumption.
Each downpipe, multiplied by a factor (ranging from 0.1 and 1) representing
how often the connected equipment is used, provides the amount of
average consumption.
The sum of the average consumption rate of each downpipe gives the
maximum flow rate required for the main pipe.
As a precaution and to allow for add-ons, add an additional percentage
to this value.
Once you have obtained the maximum flow for each downpipe and the
main pipe, you can easily calculate the diameter of each pipe using the
chart below.
The pipe diameter is calculated taking into account:
the desired flow rate (max. pressure drop 5% relative to inlet
pressure)
the required length of main pipe
When the main piping is built as a loop, the length to consider is the
maximum distance between the air inlet and the further outlet.
100 m 150 m 300 m
328 ft 492 ft 984 ft
16 20 20
20 20 25
20 20 25
20 25 25
25 25 32
25 32 32
32 32 40
32 40 40
40 40 50
40 40 50
40 50 50
40 50 50
50 50 63
50 50 63
63 63 63
63 63 80
63 63 80
80 80 80
80 80
80 80
- Obstacles (such as valves).
- Sudden or gradual variations in diameter.
9
LENGTH
500 m 750 m 1000 m
1640 ft 2460 ft 3280 ft
25 25 25
25 25 32
25 32 32
32 32 32
32 32 40
40 40 40
40 50 50
50 50 50
50 50 63
50 63 63
63 63 63
63 63 63
63 80 80
63 80 80
80 80 80
80
80
/h):
3
1300 m 1600 m
4265 ft 5249 ft
25 32
32 32
32 32
32 40
40 40
50 50
50 50
63 63
63 63
63 63
63 80
80 80
80 80
80 80
* 6 bar