TLV PowerTrap GP14-B Manuel D'utilisation page 15

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 is
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.
• For Closed Systems: An air vent for steam or a manual valve is required to discharge
the initial air in the equipment and the reservoir pipe or any gas generated in the system.
For positioning of the air vent or valve, see [Va] in the closed system drawing on page 9.
When releasing the initial air using a manual valve, leave the valve [Va] slightly open until
the PowerTrap has cycled 2 – 3 times.
(8) Velocity at Outlet Piping
The PowerTrap uses the motive medium supply pressure to push the pumped medium out
of the trap.
• The GP14-B 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] or valve for air discharge [Va] 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.
• Refer to "(2) When flash steam is not involved" in "Sizing the Condensate Receiver/
Reservoir" for information on condensate reservoir sizing.
For more details, contact TLV.
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