Pressures And Differential Pressures In The Cooling Circuit; Components And Materials Of The Cooling Circuit; Table 4-1 Materials And Components Of A Cooling Circuit - Siemens SIMOTICS FD 1LH1 Operating Instructions & Installation Instructions

Preparations for use
4.4 Configuration of the cooling circuit and coolant supply
Use either stainless steel or steel (S235JR) for the cooling circuit pipes and fittings.
4.4.2

Pressures and differential pressures in the cooling circuit

The maximum permissible overpressure in the heat sink and thus in the cooling circuit must
not exceed 6 bar. If you are using a pump, which reaches more than this maximum pressure,
then on the plant or system side ensure that the maximum pressure is not exceeded.
The lowest possible differential pressure between the coolant in the supply and return lines
should be selected to allow use of pumps with a flat characteristic. The maximum differential
pressure for a heat sink varies from shaft height to shaft height. You can find additional
information here:
Connecting the cooling water supply (Page 68)
Higher pressure differences significantly increase the risk of cavitation and abrasion.
4.4.3

Components and materials of the cooling circuit

The following table lists a wide variety of materials and components which can occur in a
cooling circuit or which are prohibited.
Table 4-1 Materials and components of a cooling circuit
Material
Zinc
Brass
Copper
Steel (e.g. S235JR)
Cast steel, cast iron
High-alloy steel, Group 1
(V2A)
High-alloy steel, Group 2
(V4A)
Installation employing differ‐
ent materials ("mixed instal‐
lation")
PVC
28
Component
Pipes, valves and fit‐
tings
Pipes, valves and fit‐
tings
Pipes, valves and fit‐
tings
Cable
Pipes, motors
Pipes, valves and fit‐
tings
Pipes, valves and fit‐
tings
Pipes, valves and fit‐
tings
Pipes, valves and fit‐
tings, hoses
Remark
Do not use any components manufactured out of zinc.
Can be used in closed cooling circuits with inhibitor.
Can only be used in closed cooling circuits with inhibitor. Locate an
isolating element, e.g. connecting pipe of the devices, between the
heat sink and copper component.
Can be used in closed cooling circuits with inhibitors or anti-freeze.
Check for the formation of oxide; to do this, use a sight glass, for
example.
Can be used in closed cooling circuits. Use sieves and return flush
filter; for stainless steel cooling systems, use a Fe separator.
Can be used for drinking or municipal water with a chloride content
< 250 ppm.
Can be used for drinking or municipal water with a chloride content
< 500 ppm.
Do not use a mixed installation.
Do not use any components manufactured out of PVC.
SIMOTICS FD 1LH1
Operating Instructions 04/2016