Installation
Page 6
5.5. Mounting to Base Foundation or Machine Flange
5.5.1. Ensure the base foundation or machine flange mounting surface is flat¹, vibration absorbing and
torsionally rigid. (
¹ Maximum permissible flatness error for the mounting surface is 0.12mm)
5.5.2. Align the pump unit with the driving shaft or motor shaft (see Appendix 1).
Note: It is important to ensure when aligning unit on a base plate or flange that all machined
mounting points are supported over their full area.
Check that all mounting points are fully supported and adjust if necessary by using steel
packing’s. If steel packing’s are used between the equipment and base plate, these
packing’s should be placed at either side and as close to the foundation bolt as possible.
During final bolting ensure the pump unit, base plate or flange is not distorted as this could
cause strains in the pump housing resulting alignment errors of shafts and rotors.
Secure using heavy duty bolts to ISO grade 8.8 minimum.
Torque tighten the bolts to value’s specified in Table 1 except for aluminium flange motors,
Bolt torques for aluminium flanged motors should be 75% of the values listed below:
Fit shaft /coupling guards where appropriate.
Bolt Size Torque
10 Nm
M16
M6
M8
M10
M12
25 Nm
50 Nm
85 Nm
200 Nm
M20
M24
M30
M36
1220 Nm
2150 Nm
350 Nm
610 Nm
Table 1
5.6. Mounting to Pipe Work
5.6.1. It is recommended that suitable priming facilities i.e. U-shaped bends are installed in the pipe work
at the suction side to prevent the pump starting dry, a filling port should be provided at the highest
point of the suction pipe work for initial priming, where the pump ports are to be mounted vertically a
non-return valve (or similar) should be incorporated in the suction line.
5.6.2. It is essential priming facilities are provided where a suction lift of greater than 2.4 Metres is
required or the pump is to be used in a potentially explosive (ATEX) atmosphere
5.6.3. If the pump is to be connected to rigid pipe work ensure the pipes and fittings are made correctly to
size so that errors in the pipe work when bolted to the pump do not impose strains in the pump
housing resulting alignment errors of shafts and rotors.
5.6.4. For pumps operating at differential pressures of over 13 Bar (20 Bar Maximum) it is recommended
that the pipe flanges are jointed as shown below:
Types of joints recommended for pressures over 13 Bar
(Fibre Washers and Steel Adapters are not supplied)
