172-65318MA-04 (GP10/GT10/GP14/GT14 PowerTrap) 23 Nov 2018
14
Sizing the Condensate Receiver / Reservoir
When selecting the receiver/reservoir for the
PowerTrap, select from among the following 3 conditions:
(1)
When large quantities of flash steam are involved
(For open systems using steam)
a) Determine the amount of flash steam:
Amount of flash steam Fs = Q
×
(hd’
−
hh’) / r
Fs : amount of flash steam (kg/h) (lb/h)
Q : amount of condensate (kg/h) (lb/h)
hd’ : specific enthalpy (kJ/kg) (Btu/lb) of saturated condensate at
condensate inlet set pressure (P
1
)
hh’ : specific enthalpy (kJ/kg) (Btu/lb) of saturated condensate at
condensate receiver set pressure (P
2
)
r : specific enthalpy (kJ/kg) (Btu/lb) vaporization (latent heat of
steam) at condensate receiver set pressure (P
2
)
b) Determine the
vent pipe diameter
according to the amount of flash steam in
Vented Receiver Table - 1 shown on the next page.
c) Determine the
overflow pipe diameter
(
D
op
, refer to the figure below).
NOTE: The overflow pipe diameter should be at least as large as the condensate
inlet pipe diameter (D
cip
, refer to the figure below).
d) Determine the
minimum condensate receiver diameter
(Dcr, refer to the figure
below) by selecting the largest value among those from (i), (ii), and (iii) based on a
condensate receiver length of 1 m.
(i) is the overflow pipe diameter multiplied by 3 or
more.
(ii) is the minimum receiver diameter according to the
amount of flash steam in Vented Receiver Table - 1
shown on the next page.
(iii) is the minimum receiver diameter according to
the amount of condensate in Vented Receiver Table
- 2 shown on the next page.
NOTE: Receiver length can be reduced by 50% when the motive pressure (P
m
)
divided by the back pressure (P
b
) is "2" or greater.
(When P
m
÷
P
b
≥
2)
Receiver
P
1
P
2
Flash Steam
Condensate
ドレンヘッダー
D
op
Overflow
Pipe
Condensate
Receiver
Condensate
Inlet Pipe
D
cr
≥
3 × D
op
D
cr
D
cip
D
op
≥ D
cip
