KRAL DKC Series - Heating system (optional); Possible types of heating; Electrical heating system

5 Function description
5.8 Heating system (optional)
5.8 Heating system (optional)
5.8.1 Possible types of heating
The pump station can optionally be equipped with a heating system. The manufacturer recommends a
heating system at high-viscosity pumped liquids that do not flow sufficiently if not heated. This can res-
ult in excessive power consumption or in problems arising through cavitation or sealing.
Possible types of heating:
o Electrical heating system
o Fluid heating system
o Special heating system
5.8.2 Electrical heating system
5
4
3
2
1
Fig.6: Electrical heating system
1 Connecting cable
2 Heating element
3 Seal ring
4 Screw plug heating element
5 Seal ring
At the small pump station the electrical heating system is installed in a heating duct within the station
block. The electrical heating system for the large pump station consists of two heating elements that
are integrated in two heating ducts of the station block. The output of the elements corresponds to the
radiation losses and convection losses of the pump in the required temperature range so that overheat-
ing is not possible.
0
10
20
30
40
50
60
0 10 20 30 40 50 60
t [min]
T [K]
Δ
Δ
A
B
Fig.7: Temperature rise after the heating system
has been switched on
Δt Heating-up period
ΔT Temperature rise
A Rear of the pump station
B Front of the pump station
Heating of the station block of the small pump station after the steady-state condition has been
reached:
o Rear of the pump station: approx. 60K
o Front of the pump station: approx. 40K
Small pump station Large pump station
1 heating element 2 heating elements
1 screw plug 2 screw plugs
2 seal rings 4 seal rings
0.5l thermal oil Caldo ISO32 0.25l thermal oil Caldo ISO32
Tab.11: Scope of delivery of electrical heating system
16
OID 02en-GB Edition 2019-11
Operating instructions