T
o
= T
f
+ ΔT
ΔT =
g x H
c x η
x (1 - η)
Fig. 1: Calculation formula
Table 5: Key
Symbol Description Unit
c Specific heat capacity J/kg K
g Gravitational constant m/s
2
H Head m
T
f
Temperature of the fluid handled °C
T
o
Temperature at the casing surface °C
η Pump efficiency at duty point -
ΔT Temperature difference °C
2.10.5 Contact guard
The pump must only be operated with the original perforated contact guard which
was supplied with the pump.
Never modify or cover the contact guard supplied with the pump.
If a closed contact guard is used, the temperature inside the pump will rise. This
would constitute a source of ignition, which must definitely be prevented.
2.10.6 Selecting a suitable lubricant
Lubricant escaping from a bearing housing or a damaged constant-level oiler / oil
level indicator could drip onto hot pump surfaces. This could lead to ignition of the
oil.
The pump must only be operated with a suitable lubricant. The ignition temperature
(flash point) of the lubricant must exceed the maximum surface temperature of the
pump by at least 50 K.
2.10.7 Repair
Special regulations apply to repair work on explosion-proof pumps. Modifications or
alterations of the pump set may affect explosion protection and are only permitted
after consultation with the manufacturer.
2 Safety
WKTR
13 of 78
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