172-65378MA-03 (GP10F PowerTrap) 23 Apr 2019
11
(6) 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 and outlet lines as well as on the motive
medium supply and exhaust lines. If it is necessary to reduce the velocity of the
motive medium supply, a needle valve can be used. However, be aware that the
discharge capacity will be reduced. (Refer to 1.e in the “Operation” section.)
•
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 “Installation and Maintenance Space”).
(7) Receiver and Filling Head
•
Please refer to “Sizing the Condensate Receiver/Reservoir”.
The size and vent pipe aperture are determined by (a) the amount of any flash
steam in the in-flowing condensate (pumped medium) and (b) the amount of
pumped medium held back while the PowerTrap is discharging. If the receiver is
small, the flow of flash steam may cause condensate to flow out the vent pipe. If
the vent pipe size is small, the pressure in the receiver will rise, restricting the
pumped medium inflow. Be sure to select a receiver pipe of the correct size.
•
The filling head represents the distance from the bottom of the PowerTrap (from
grade) to the bottom of the receiver/reservoir. The standard filling head is
1070 mm (42 in). When an installation calls for a lower filling head, a filling head
of less than 1070 mm (42 in) is allowable. However, the minimum filling head is
860 mm (33 in).
•
For open systems:
- If venting flash steam to a high area, an overflow pipe must be installed to
discharge condensate to a safe area.
- Overflow pipe should be installed at the side of the receiver.
•
When discharging flash steam from the condensate receiver upward
through the pipe to outside atmosphere, be sure to install an overflow
pipe and discharge to a safe area such as a pit. Failure to install an
overflow pipe is dangerous, as condensate may spurt from the vent pipe
and could result in burns and other injuries.
•
To minimize the discharge of flash steam from the overflow pipe, use an
overflow pipe with a U-shaped section about 12 in (300 mm) in length.
WARNING
Examples of Overflow Piping for Open Systems
12 in
(300 mm)
Condensate
Receiver
1)
2)
Flash
Steam
Flash
Steam
Condensate
Receiver
To
PowerTrap
To
PowerTrap
Flash
Steam
Vent Pipe
Vent Pipe
Overflow Pipe
Overflow Pipe
Condensate
Condensate
Loop Seal
NOTE:
This sketch is for
explanation purposes
only and is not intended
as an installation design.
Pipe the discharge to a safe place such as a pit.
High temperature steam or hot water may
splash.
There is a possibility of condensed hot water dripping from vent pipe
outlet. Make sure to extend to where people do not pass.
