SPX FLOW Johnson pump, Инструкция по эксплуатации, Страница: 20 / 57

18 Installation and preparation start-up
KGE/EN (1711) 6.5
3.3 Main piping (suction / discharge)
• Select the suction line diameter as a function of its length. It must not be smaller than
the pump suction connection.
• The suction and discharge lines should have a snug fit and remain stress free, also
during operation.
3.3.1 Forces and torques on the flanges
The working forces and torques on the flanges cause deformation of the pump unit.
Excessive forces and torques can cause mechanical damage to the pump. These forces
and torques manifest themselves in a displacement of the ends of the pump and motor
shafts. As a point of departure for determining the permitted forces and torques on the
flanges, the following maximum values for the radial displacement of the end of the pump
shaft can be applied :
For the determination of the forces, the weight of the pipes and the liquid must be taken
into account. A distinction must be made between a pump unit which has its base plate
set in concrete and one that does not.
bearing bracket mm
00

0,15
0 / 0+

0,20
1

0,20
2

0,20
Figure 3: Forces and torques on the flanges
Index v: in the vertical direction (the y-axis)
Index h: in the horizontal direction (x- and z-axes)
M: torque in the surface (plane) of the flange
Fv: force in the vertical direction
Fh: force in the horizontal direction