172-65318MA-04 (GP10/GT10/GP14/GT14 PowerTrap) 23 Nov 2018
13
Explanations for Overflow Piping for Open Systems
1) If flash steam can be discharged from overflow pipe
Install overflow pipe and vent pipe separately.
2) If flash steam should not be released from overflow pipe (prevent flash steam release)
Install overflow pipe and vent pipe separately. For overflow pipe, install loop
seal (approx. 300 mm (12 in)). Flash steam release from overflow pipe can be
prevented since water always accumulates at loop seal. Piping size should be
the same or larger than condensate supply pipe.
NOTE: • There is a possibility of rust becoming clogged and/or corrosion since
water always present in the loop seal. The possibility is greater if the
piping diameter is too small (generally 25 mm (1 in) or smaller).
• If the loop seal becomes clogged, hot overflow water will blow from vent
pipe. Make sure to install vent pipe to lead to a safe place
• Do not install loop seal on the vent pipe
Contact TLV if neither
1)
nor
2)
above can be installed.
(8) Velocity at Outlet Piping
The PowerTrap uses the motive medium supply pressure to push the pumped
medium out of the trap.
•
The GP10/GT10/GP14/GT14 can discharge approximately 30 liters (8 U.S. gal) of
pumped medium for each discharge operation.
•
The amount of time required for each discharge operation will be between 3 and 30
seconds, depending on the back pressure and the motive medium pressure.
This means that the instantaneous flow through the pumped medium outlet pipe
during the discharge operation is between 4 and 40 metric tonnes (1,060 and
10,600 U.S. gal) per hour.
•
When a flowmeter is to be installed in the pumped medium outlet piping, it should
be selected to reflect the intermittent operation and should be sized to
accommodate the maximum and minimum instantaneous flow. Contact TLV for
details.
(9)
For Closed Systems
: An air vent (for steam) [La] is required to discharge the initial
air in the equipment and the reservoir pipe or any gas generated in the system. In
this case, installing the check valve for air vent [Ca] will prevent air from being
sucked in from the outlet of the vent pipe [Sv]. This check valve must be installed
when the pressure inside the piping becomes negative. A valve for air discharge [Va]
can be installed instead of the air vent (for steam) [La] and check valve for air vent
[Ca].
When releasing the initial air using a valve for air discharge, leave the valve for air
discharge [Va] slightly open until the PowerTrap has cycled 2 – 3 times. Close the
valve for normal operation.
(10)
For Closed Systems
: Select the appropriate PowerTrap model (GT or GP) based
on the explanation in “General Description” on page 5.
(11)
For Closed Systems
: Refer to “(2) When flash steam is not involved” in “Sizing the
Condensate Receiver / Reservoir” on page 16 for information on condensate
reservoir sizing.
For more details, contact TLV.
