P
P
a
a
g
g
e
e
9
9
o
o
f
f
2
2
4
4.5. HEATING CHAMBER
The heating or cooling chamber is heated or cooled connecting it to an external circuit with hot liquids like oil or steam with the
aim of heating very viscous liquids or freezing liquid into the pumping chamber. The chamber covers are equipped with some
connections from 3/8" to 1/2" GAS, depending on the different models, through which the hot oil or the steam is entered.
Note:
The liquid used in the heating chamber must have an ignition temperature at least of 50 ºC / 122 ºF above the maximum
superficial pump temperature.
The pressure in the heating chamber must not exceed than 10 bar / 145 psi.
Note:
When the pump works with hot liquids that create a high superficial temperature, it is advisable to place a signal, warning
about the danger in order to avoid the users burn themselves.
All the pumps with heating chamber working in an explosive atmosphere will have always built in a mechanical locking.
4.6. SURFACE TEMPERATURE OF THE PUMP
The surface temperature of the pump mainly depends on the pumping liquid temperature, the working conditions, the liquid
temperature that there is into the heating chamber (the models with heating chamber) as well as its design.
When determining the maximum surface temperature, choose the following minimum values:
Apart of depending on the pumping liquid temperature, the maximum surface temperature of the pump is determined by the
used manufacturing materials. The used elastomer can work in different temperature ranges.
According to the pumping liquid, the used elastomer depends on its chemical compatibility with the fluid.
In presence of potentially explosive gases, the surface Tª of the pump must be equal to or less than 80% of the gas ignition
temperature.
In presence of potentially explosive powder, the temperature must be equal to or less than 2/3 of the powder ignition
temperature.
The maximum surface temperature will be the minimum value of these possible values:
MINIMUM/MAXIMUM TEMPERATURE OF DIFFERENT ELASTOMERS
ELASTOMER TYPE ELASTOMER MARK MIN/MAX Tª
FPM VITON -25 ºC/+205 ºC
NBR NITRILE -30 ºC/+115 ºC
PTFE TEFLON -45 ºC/+260 ºC
A badly projected installation (refer to the above section 3.2. of this manual) where the pump works empty (without liquid)
or the fluid is recirculating into the pump without being delivered to the discharge tank could cause the increase of the
surface temperature of the pump.
The pump must be freely exposed to the atmosphere, allowing its own cooling.
4.7. ATEX MARK OF THE EQUIPMENT
Equipment description: High flow blade pumps · Series: BDP-300 · BDP-400 · BDP-500 · BDP-600 · BDP-800
Marked: II 2G DT *
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