172-65473MA-03 (GT5C PowerTrap) 17 Jul 2019
13
(5) Valves on the Various Pipes
In order to ensure the proper discharge capacity, use full bore ball valves or gate
valves on the pumped medium inlet [Vi] and outlet lines [Vo].
Be sure to install blowdown valve [Vb]. A bellows sealed valve is recommended,
due to the lack of leakage from the gland and easy flow rate adjustment.
Install union or flanged joints between the valves and the PowerTrap to allow for
easy maintenance.
Be sure to provide the necessary maintenance space for PowerTrap disassembly
and repair (see “Maintenance Space”).
(6) Reservoir Pipe and Filling Head [A]
Please refer to “Size of the Condensate Reservoir
Pipe
” shown below.
The size and length (volume) are determined by
the amount of pumped medium held back while
the PowerTrap is discharging. Therefore, the area
below the inlet piping cannot be considered in the
effective volume of the reservoir [Dh].
The filling head [A] represents the distance from the installation surface of the
PowerTrap (from grade) to the bottom of the inlet piping (condensate reservoir
[Si]), shown as [A] in the sketches in
“Steam System Example”. The minimum
filling head for GT5C is 155 mm (6
”).
Sizing the Condensate Reservoir Pipe
The PowerTrap reservoir pipe size for each condensate discharge amount should be
selected from the following table.
Condensate
Amount
kg/h
Diameter [mm (in)] and Length [m] of
Condensate Reservoir Pipe
25 (1)
32 (1¼)
40 (1½)
50 (2)
80 (3)
50
0.6 (m)
100
1.2
0.6
0.4
150
1.8
1.0
0.6
0.4
200
2.4
1.3
0.8
0.5
300
2.0
1.2
0.7
400
2.6
1.5
1.0
500
2.0
1.2
0.5
Condensate
Amount
lb/h
Diameter [in] and Length [ft] of
Condensate Reservoir Pipe
1
”
1
¼”
1½”
2
”
3
”
100
2.0 (ft)
150
3.0
1.5
200
3.9
2.0
1.3
300
5.6
3.0
2.0
1.3
500
4.9
3.0
2.0
700
6.9
4.0
2.5
1.0
1000
5.5
3.5
1.5
If the motive medium supply pressure [P
m
]/back pressure (P
b
)
≥ 2, the length of
condensate reservoir pipe can be reduced by ½.
Shadowed area is not included in
reservoir volume calculations
