Flowserve WUC Worthington User Manual
Page 21
WUC USER INSTRUCTIONS ENGLISH - 07/14
Page 21 of 52
4.5.3.1 Standard Design
The suction line must be continuously vented through
gas trap valve 3 (Fig.4). Prior to start-up the
discharge line must be open through the valve 1 until
the line is completely vented.
The suction CAN itself must also be vented through
the by-pass as shown in the Figure 4. For this, two
lines shall be manifold. Line1 shall be designed with
no orifice and its valve shall be open through prior
start up until liquid flows and be in closed position
during operation. Line 2 shall be fitted with a 3 mm
orifice (to minimize capacity losses) and shall be
always kept open to allow venting of gas at all times.
Furthermore, the API Plan 13 must be designed with
a venting line to ensure that no gas will be trapped in
the column pipes (discharge side of the pump).
To ensure positive venting, all vent lines must
be connected to the gas phase of the suction tank.
Fig.4