SMC Networks PA3000 Series, Manual, Page: 22 / 29

Performance Curve: Automatically Operated Type, Built-in Pulsation Attenuator
Required specification example:
Find the pilot air pressure and pilot air consumption for a dis-
charge rate of 6
l
/min and a discharge pressure of 0.25 MPa.
<The transfer fluid is fresh water (viscosity 1 mPa·s, specific
gravity 1.0).>
∗
If the total lifting height is required instead of the discharge
pressure, a discharge pressure of 0.1 MPa corresponds to a to-
tal lift of 10 m.
1. First mark the intersection point for a discharge rate of 6
l
/min and a
discharge pressure of 0.25 MPa.
2. Find the pilot air pressure for the marked point. In this case, the
point is between the discharge curves (solid lines) for SUP =
0.2 MPa and SUP = 0.5 MPa, and based on the proportional
relationship to these lines, the pilot air pressure for this point is
approximately 0.45 MPa.
3. Next find the air consumption. Since the marked point is below
the curve for 50
l
/min (ANR), the maximum rate will be about
45
l
/min (ANR).
Selection from Flow Characteristic Graph
PAX1000
Flow Characteristics
Required specification example:
Find the pilot air pressure and pilot air consumption for a dis-
charge rate of 2.7
l /min, a discharge pressure of 0.25 MPa, and a
viscosity of 100 mPa·s.
Selection procedures
1. First find the ratio of the discharge rate for fresh water when
viscosity is 100 mPa·s from the graph below. It is determined
to be 45%.
2. Next, in the required specification example, the viscosity is 100
mPa·s and the discharge rate is 2.7
l /min. Since this is equiva-
lent to 45% of the discharge rate for fresh water, 2.7 l /min
÷
0.45 = 6 l /min, indicating that a discharge rate of 6 l /min is
required for fresh water.
3. Finally, find the pilot air pressure and pilot air consumption
Selection from Viscosity Characteristic Graph
Caution
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0 5
Discharge rate (
l
/min)
Discharge pressure (MPa)
SUP = 0.7 MPa
SUP = 0.5 MPa
SUP = 0.2 MPa
Air consumption 50
l
/min(ANR)
Air consumption 30
l
/min(ANR)
10
Viscosity Characteristics
(Flow rate correction for viscous fluids)
100
50
0
1 10 100 1000
Viscosity (mPa·s)
Ratio of discharge rate against fresh water (%)
Viscosities up to 1000 mPa·s can be used.
Dynamic viscosity
ν
= Viscosity
µ
/Density
ρ
.
ν
=
ν
(10
–
3
m
2
/s) =
µ
(mPa·s)/
ρ
(kg/m
3
)
µ
ρ
Caution
1. These flow characteristics are for fresh water (viscosity 1
mPa·s, specific gravity 1.0).
2. The discharge rate differs greatly depending on properties
(viscosity, specific gravity) of the fluid being transferred and
operating conditions (lifting range, transfer distance), etc.
3 . Use 0.75 kW per 100 l /min of air consumption as a guide for
the relationship of the air consumption to the compressor.
691
Series
PAX1000
Process Pump
Automatically Operated Type, Built-in Pulsation Attenuator
PA
PAP
PAX
PB
PAF
PA
첸
PB