BOC Edwards 18B4B, Инструкция по эксплуатации, Страница: 24 / 62

Issue A Feb 04
PAGE
18
18B4B Vapour Booster Pumps
IN
STALLATION
18
• Before you connect the pump to your vacuum
system: inspect the inlet and outlet flange
sealing faces and ensure that they are free of
scratches; if necessary, refinish the sealing
faces; clean the flanges with a suitable cleaning
solution.
3.4.2 Connect the pump inlet
Notes: 1. Some of the ’ O ’ rings necessary to install the
pump are supplied in the fitting pack.
2. If the pump is not free-standing, you will have
connected the pump inlet in Section 3.3.2.
Refer to Figure 1. Connect the pump inlet (1) to
your vacuum system. When you connect the pump
inlet:
• Use the correct number and size of bolts to
connect the pump to your vacuum system.
• Use an ‘O’ ring (3) to seal the connection;
clean the ‘O’ ring and apply a light wipe of
pump fluid or vacuum grease to the ‘O’ ring
before you connect the inlet flange. Ensure
that the ‘O’ ring is not twisted.
• The pump is tested with AP201 fluid before
delivery. Internal surfaces of the pump are
therefore covered with a thin film of AP201
fluid. (Pumps ordered for use with alternative
fluids will be tested with the alternative fluid.)
Use acetone or another suitable cleaning
solution to clean the pump flanges before you
connect the pump to your vacuum system.
• We recommend that you fit a combined baffle
and isolation valve to the pump (refer to
Section 7.4). A baffle valve minimises the back
streaming of pump fluid into your vacuum
system. This back streaming is unacceptable in
some applications.
3.4.3 Connect the pump outlet
Refer to Figure 1. Connect the backing outlet (16)
to your backing pipeline.
When you connect the backing outlet:
• For EHVI flange pumps, you may either use a
2 inch union to connect the backing flange, or
connect directly to the backing flange.
• Cover all Co-Seals, centring-rings and ‘O’
rings with a light wipe of pump fluid or
vacuum grease before you connect the outlet.
• Adequately support the backing pipeline, to
prevent the transmission of stress to the
backing connection.
3.5 Cooling-water connections
The minimum cooling water flow given in
Section 2.5 is calculated for a 15
o
C temperature
rise. Thus, with a high water inlet temperature, it
may be necessary to increase the flow to maintain
the outlet temperature below 35
o
C. Do not exceed
this temperature, otherwise a thermal snap-switch
may operate to switch off the pump, and fluid loss to
the backing pipeline will increase.
WARNING
Conduct the outlet pipeline to a
suitable treatment plant to prevent
the discharge of dangerous gases and
vapours to the surrounding
atmosphere.
CAUTION
Make sure the cooling-water flows in the correct
direction. If it does not, there will be increased
backstreaming and loss of performance, which may
have an adverse effect on your process.
CAUTION
Do not fit quick-fit couplings to the pump cooling-
water inlet and outlet. Use of these couplings can
result in trapped volumes of water.