BOC Edwards 18B4B, Instruction Manual, Page: 44 / 62

Issue A Feb 04
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38
18B4B Vapour Booster Pumps
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3. Disconnect the cooling-water supply and return
pipelines from the cooling-water inlet and
outlet (4, 15).
4. Refer to Figure 1. Loosen the
1
/
2
inch union nut
and remove the dipstick (21).
5. Place a suitable container (with a capacity of at
least 10 l) under the fluid drain connection (29).
6. Loosen the 1 inch union nut on the fluid drain
connection (see Note 1 above), and allow the
pump fluid to drain into the container.
7. If the pump is fitted to the vacuum system:
• Use a wide-track pallet truck or fork-lift to
raise the pallet (on which the pump was
supplied) under the pump, so that the fixing
holes on the pump (Figure 3, items 13) align
with the fixing holes in the pallet.
• Fit the nuts, bolts and washers (retained when
you installed the pump) through the fixing
holes to secure the pump to the pallet.
• Disconnect the pump inlet (1) and outlet (16)
from your vacuum system.
• Slowly and carefully lower the pump and (if
required) move it to the location where you
will carry out maintenance.
• Continue at Step 9.
8. If the pump is free-standing:
• Disconnect the pump inlet (1) and outlet (16)
from your vacuum system, then move the
inlet and outlet pipelines away from the pump.
• Alternatively: If necessary, disconnect the
electrical cables from the pump, then use
suitable lifting equipment to move the pump
away from the pipelines: use the method
described in Section 3.3.3.
9. Disconnect the cooling couplings (36, 40) that
link the top cone and the side cone cooling-coils
to the cooling coils on the ‘T’ piece.
10. Undo the four M8 fixing bolts which secure the
guard ring (2), and remove the guard ring.
11. Unscrew and remove the top jet cap (47), then
remove the top and second stage vapour tubes
(5 and 6).
12. Unscrew and remove the tie-rod (35) from the
securing plate in the boiler.
13. Attach suitable slings to the pump under the
inlet flange, then attach suitable lifting
equipment (such as an overhead crane or hoist)
to the slings, to support the top cone assembly
(45). (Refer to Section 2.3 for the mass of the
top cone assembly.)
14. Remove the six M8 screws that secure the top
cone (45) to the pump body, then use the lifting
equipment to remove the top cone. Carefully
place the top cone on a clean work surface.
15. Remove the six M5 cap-head screws that
secure the lower vapour tube (42) to the boiler
assembly, then remove the vapour tube and the
jet gasket (39).
16. Undo the M6 fixing screw, and lift the baffle
assembly (18) out of the backing condenser.
17. Undo the 1 inch BSP union nut on the
condenser fluid return pipe (20).
18. Attach two slings to the side cone assembly
(14), then attach the slings to suitable lifting
equipment to support the cone assembly.
(Refer to Section 2.3 for the mass of the side
cone assembly.)
19. Undo and remove the six M8 nuts which secure
the side cone assembly to the boiler (33).
20. Remove the side cone assembly (14), and
carefully place the assembly on a clean work
surface.
21. Unscrew and remove the ejector nozzle (8).
22. Undo the six M8 screws which secure the ‘T’
piece (38) to the boiler (33), and remove the ‘T’
piece.