HAMMELMANN HDP 502 / S 1100-50, Руководство по эксплуатации, Страница: 295 / 311

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5 Instructions concerning operation and maintenance
5.1 Unauthorised modes of operation
The warranty relating to the operating reliability and safety of the unit supplied is only valid if the equipment is used in
accordance with its designated use as described in the following sections of this supplementary operating manual
and the pump-specific operating manual. The limits stated in the data sheet must not be exceeded under any
circumstances.
Any operation of the pump outside the permissible operating range and any unauthorised modes of operation
may result in the specified temperature limits being exceeded (see section 5.8).
5.2 Explosion protection
If the pumps / units are installed in hazardous areas where compliance with EC directive 94/9/EC is required,
the measures and instructions given in the following sections 5.3 to 5.9 must be carried out with no excuse, to ensure
explosion protection.
5.3 Pump filled and vented
Especially dry running of a pump results in friction and non-allowed temperature rise. Therefore precautions have to
be taken to prevent dry running.
It is necessary that the system of suction and discharge lines and thus the wetted pump internals including
seal chamber and auxiliary systems are completely filled with the fluid to be handled at all times during pump
operation, so that an explosive atmosphere is prevented.
If the operator cannot warrant this condition, appropriate monitoring devices must be used.
Improper installation (e.g. vertical installation) may impair the self-venting properties of the seal chamber, so that gas
bubbles may be collected in the pump and cause the mechanical seal to run dry.
High negative pressure on the suction side (e.g. due to clogged suction-side strainers or low system pressure)
may result in air intake at the shaft seal forming gas bubbles in the pump. This may also cause the mechanical seal
to run dry. Suitable monitoring facilities shall be installed, if necessary.
For design-inherent reasons, however, it is not always possible to exclude the existence of a certain residual
volume not filled with liquid after the pump has been filled prior to start of operation. However, once the motor is
started up the pumping effect will immediately fill this volume with pumped fluid.
It is imperative to make sure that the seal chambers and auxiliary seal systems are properly vented from air and filled
with liquid.
5.4 Marking
The Ex marking on the pump only refers to the pump part, i.e. the coupling and motor must be considered
separately. The coupling must have an EC Declaration of Manufacturer and the EC marking. The driver must be
treated separately.
Example of marking on the pump part:
CE Ex II 2 G c T1 - T5
The safety instructions published in section 5.8 must be complied with.
5.5 Fluid handled
Abrasive particles in the fluid handled may erode the casing walls to such an extent that fluid may escape.
When handling inflammable media, it has to be ensured that the fluid does not contain any abrasive particles, or that
the pump is regularly checked with respect to erosion.
5.6 Checking the direction of rotation (see also pump-specific operating manual)
If the explosion hazard also exists during the installation phase, the direction of rotation must never be
checked by starting up the unfilled pump unit, even for a short period, to prevent temperature increases resulting from
contact between rotating and stationary components. If it is not possible to fill the pump, the direction of rotation must
be checked with the pump / motor coupling removed.
HAMMELMANN Code no.: 04.03226.0769
Type 32-200