To be checked during assembly:
–
The impellers must be placed on the shaft with the blades leaning
in the direction of rotation (clockwise as viewed from the drive end
- except size 3 is anticlockwise).
–
The clearance between the impellers and the side plates is set at
manufacture. If new parts are fitted the abutment ring may need
to be re-machined or shimmed for pump sizes 3 to 8 (shim packs
are available from Busch). For size 9 to 11 pumps, the impeller to
side plate clearance is set by using bearing caps at the non drive
end
–
The clearance between the inter plate and the 1st and 2nd stage
impellers must be checked when the rotating assembly is built up
as shown below.
–
Standard construction (cast iron): the impellers and impeller casings
are machined so as to give the desired clearance ‚C’, liquid gasket
is used to seal the components and so does not affect the clear-
ance.
–
Stainless steel and bronze construction: the impellers and impeller
casings are machined the same width as each other. Gaskets are
used to create the required clearance.
Clearances:
The impeller spacer (521, two stage only) should be either machined or
shimmed to give a clearance ‘C’. For size 9 pumps the clearance can be
centralised at the non drive end by adjusting the bearing end caps
(360.1, 360.3)
Pump size
Cast iron
Bronze, 316ss
3
0.10 ... 0.15 mm
(0.004" ... 0.006")
0.15 ... 0.23 mm
(0.006" ... 0.009")
4
0.10 ... 0.15 mm
(0.004" ... 0.006")
0.15 ... 0.23 mm
(0.006" ... 0.009")
5
0.15 ... 0.20 mm
(0.006" ... 0.008")
0.23 ... 0.30 mm
(0.009" ... 0.012")
6
0.20 ... 0.25 mm
(0.008" ... 0.010")
0.30 ... 0.38 mm
(0.012" ... 0.015")
7
0.25 ... 0.35 mm
(0.010" ... 0.014")
0.35 ... 0.45 mm
(0.014" ... 0.018")
8
0.30 ... 0.40 mm
(0.012" ... 0.016")
0.40 ... 0.50 mm
(0.016" ... 0.020")
9
0.30 ... 0.40 mm
(0.012" ... 0.016")
0.40 ... 0.50 mm
(0.016" ... 0.020")
10, 11
0.35 ... 0.45 mm
(0.014" ... 0.018")
0.45 ... 0.55 mm
(0.018" ... 0.021")
Fitting of the Abutment Ring (Sizes 3 to 8 Only)
This operation should be carried out when the pump is built up except
for the ball bearings, mechanical seals and bearing caps. The abutment
ring enables the impellers to be spaced equally from the plates. The
distance from the shoulder on the shaft to the bearing location in the
housing has to be found. This is done with the use of a depth gauge as
shown below.
The abutment width is determined as the mean value of ‘A’ when the
shaft is moved in both directions les ‘B’. Use a dummy bearing to slide
the shaft backward and forward. Once the abutment has been deter-
mined the bearing seal housing can be removed and the mechanical
seals fitted (series 2 only).
Overhaul
Busch service will only accept vacuum pumps that come with a com-
pletely filled in and legally binding signed “Declaration of Contamina-
tion” (form downloadable from www.busch-vacuum.com).
Removal from Service
Temporary Removal from Service
●
Prior to disconnecting pipes/lines make sure that all pipes/lines are
vented to atmospheric pressure
In case water is being used as operating fluid and the ambient temper-
atures can fall below 0 °C or the vacuum pump is scheduled to be shut
down for more than 12 weeks:
◆
Drain the water
In case water is being used as operating fluid, the ambient tempera-
tures can fall below 0 °C and the water is not meant to be drained:
◆
Make sure the water sufficiently provided with antifreeze
Recommissioning
●
Observe the chapter Installation and Commissioning (
Ú
page 5)
Dismantling and Disposal
●
Make sure that materials and components to be treated as special
waste have been separated from the vacuum pump
●
Make sure that the vacuum pump is not contaminated with harm-
ful foreign material
According to the best knowledge at the time of printing of this manual
the materials used for the manufacture of the vacuum pump involve
no risk.
●
Dispose of the vacuum pump as scrap metal
Spare Parts
When ordering spare parts from Busch please quote the following:
- Pump type / model number
- Pump serial number
- Pump ID number
- Part number
- Description of part
LA 0053-1111 A, LB 0063-1011 A
Overhaul
0870150638 / 091222
page 12
Summary of Contents for DOLPHIN LA 0053-0143 A
Page 27: ......
