Flowserve WUC Worthington - Manual (Page 44)

WUC USER INSTRUCTIONS ENGLISH - 07/14
Page 44 of 52
Try to turn the rotor by hand.If the
rotor cannot be turned readjust it following procedure
in section 5.3.1 Adjusting of the rotor.
The mechanical seal requires no adjustment
anymore. Check if the mounting plates are already
swung out.
Actions after start up:
Check all connections to the seal gland and the
mechanical seal itself against leakage. Check the
temperature of the seal gland. I slight increase of
temperature may be observed during the run in
period.
The faces of the inner mechanical seal are flushed by
the product (API Plan13). API Plan 13 provides self
venting although a blinded venting connection is
forseen. This connection shall be used by pumping
flushing hydrocarbons at ambiente temperatures and
above. The inner mechanical seal is subjected to
discharge pressure.Between the inner mechanical
seal and the outer (atmospheric) mechanical seal is a
liquid buffer fluid, which is unpressurized (API Plan
52). The buffer fluid is contained in a seal pot (refer to
drawing of the seal pot), which is vented to a vent
system, thus maintaining the buffer fluid pressure
close to atmospheric.
Inner seal leakage will be product leakage into the
buffer fluid. There will always be some leakage
(max.5 ml/hour).
Plan 52 is used for flashing liquids, which have a
vapour pressure higher then the buffer fluid pressure.
So the product will flash in the seal pot and the
vapour can escape to the vent system.
All screw / flange connections have to be proofed.
Straight screw joints made of stainless steel have to be
tightened especially carefully.
Fill the seal system with a suitable
buffer fluid (refer to lubrication table).
Ensure that the valve GV for the
connection V is open (Barrier/buffer fluid vessel
drawing).
Open the Block & Bleed valve to
allow proper function of the PSH (set point 0.5 bar
(7.25 psi) above flare pressure).
Open all necessary valves in the
cooling and auxiliary piping and check the flow.
API Plan 61 has tapped and plugged connections for
the purchaser´s use. Typically this plan is used when
the purchaser is to provide fluid (such as steam, gas, or
water) to an external sealing device.
Refer to the GA - drawing for the
required quench medium, pressure and flow.
Disassembly of the seal cartridge
is only allowed by authorized personal. Contact
Flowserve for any service of the mechanical seal. We
recommend to have a spare cartridge seal on stock
for easy replacement.
7.1.3 Dual Mechanical Seal unpressurized with
API–Plan 13+72+76
Refer to mechanical seal drawing and
auxiliary piping drawing.
The pump is equipped with a dual mechanical seal.
The cartridge design allows to change the
mechanical seal without taking it apart.
The seal cartridge consists of a contacting wet inner
seal and a dry containment seal. A buffer gas is used
to sweep inner seal leakage away from the outer seal
into a collection system and/or provide dilution of the
leakage, so that emissions from the containment seal
are reduced.
The plan 72 system is intended to function as follows:
The barrier gas first flows through an isolation block
valve and check valve provided by the purchaser. It
then enters a system, usually mounted on a plate or
panel, provided by the seal vendor. An inlet block
valve on the panel is followed by a 10 µm (0.0004 in.)
filter coalescer (if specified) to remove any particles
and liquid that might be present. The gas then flows
through a back pressure regulator (if specified) which
is set at least 0.5 bar (7 psi) above atmospheric
pressure. Next comes an orifice to provide flow
regulation followed by a flow indicator to measure
flow. The pressure indicator is used to ensure the
pressure is not above the seal chamber pressure.
The last elements on the panel are a check valve and
block valve. Buffer gas is then routed to the seal
using tubing. A containment seal vent (CSV) and
drain (CSD) are also located on the gland.
The inner mechanical seal is flushed by an
API Plan 13.
Actions before first start up:
The pump will be delivered with correct vertical
adjustment of the rotor.
Try to turn the rotor by hand.If the
rotor cannot be turned readjust it following procedure
in section 5.3.1 Adjusting of the rotor.
The mechanical seal requires no adjustment
anymore. Check if the mounting plates are already
swung out.