2 Safety
All warnings in the manual are summarised in this section.
Pay special attention to the instructions below so that severe personal injury and/or damage to the pump are avoided.
2.3
Special conditions for safe use
General warnings.
Always read chapter 4.2 Operating conditions.
Never run the pump with neither the suction side nor the pressure side blocked.
Always ensure that the pump is liquid filled when operating, unless a doubled mechanical seal is fitted (See table C).
Always ensure that the pump is liquid filled if the process media is flammable.
Never mount shroud on the pump if the name plate states "shroud not allowed".
Always stop the pump if
-
operating outside the given limits of the process media temperature or flow rate (See table A and B).
-
operating outside the given limits of the flush media temperature or flow rate (See table C).
-
Note it must be ensured that the flow and temperature limits for the process media or flush media are maintained when the
pump is operating. If this cannot be ensured in any other way, the flow and temperature should be continuously monitored.
Note In case of seal failure, leakage may occur. If this can lead to hazardous situations, the risk must be evaluated and
necessary precautions must be taken. (See chapter 6.2 Technical information and description of mechanical shaft seals).
Note the motor is a separate certified ATEX product and covered by EU-type examination certificate and must be handled
according to the specifications in the motor instruction manual.
Safety critical limitations for specific ATEX markings.
Table A
Pump marking options
Ambient temperature
Critical temperature range of
process media
II 2 G
Ex h IIB T4 Gb Ta -20C to +35C
-20°C to +35°C
(Shroud allowed) *
3
II 2 G
Ex h IIB T4 Gb
-20°C to +40°C
(Shroud NOT allowed)
-10°C to 100°C *
1&2
II 2 G
Ex h IIB T3 Gb
-20°C to +40°C
(Shroud allowed)
-10°C to 140°C *
1&2
*1 See table B for position of temperature sensor and min. flow rates.
*2 “b1” ignition control is used, see details in section below “b1 control system requirements”.
*3 For pumps with temperature class T4 and with 18,5kW motors or larger, shroud is not allowed (independent of ambient
temperature).
Note For T4 applications the pump casing and seal housing can be sterilized to max 125
o
C when the pump is NOT operating.
Note Ensure that the chosen elastomer is compatible with the process media and the media temperature (see chapter
4.2 for more information).
Note The LKHex UltraPure can only be marked for category 2G but can be used for 3G applications also.
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