Filling The Unit; Special Operating Conditions; Chargeable Liquids; Identification - Richter RMI-B Series Installation And Operating Manual

Sealless chemical magnetic drive pump

Hide thumbs

Table Of Contents

Table of Contents

Series RMI-B

close-coupled design

2.6.1 Filling the unit

During pump operation the wetted interior

of the pump must always be filled with the

liquid medium.

This prevents any explosive atmosphere and the risk of

dry-running.

If the customer cannot ensure this, we recom-

mend that appropriate monitoring facilities be

provided.

Also carefully fill auxiliary, heating and

cooling systems.

2.6.2 Special operating conditions

In the standard design the can chamber

and the plain bearings are cooled and lubri-

cated by a flushing flow.

Owing to properties of the medium (e.g. sticking due to

inadmissible solids entrainment, clogging, gas entrain-

ment etc.) the cooling flow can be interrupted and, as a

result, an inadmissible temperature rise may occur.

Provide appropriate monitoring facilities. See Section

5.6.

For safe pump operation, we recommend a flow rate of

0.3 to 1.1 Q

. If the pump is operated outside this

opt

range, it must be ensured that the max. admissible flow

rate according to the pump characteristic curve is not

exceeded and that the max. admissible operating

temperature according to Section 2.6.7 is observed.

If the flow rate is too high, the differential pressure

upstream and downstream of the plain bearings could

fall so much that a lack of lubrication or dry-running may

occur.

If the flow rate is too low, the medium may heat up so

much owing to the fluid friction that the max. admissible

surface temperature of the relevant temperature class

is exceeded.

Overloading, overheating, non-observance of the

design data or the incorrect selection of the magnetic

drive can lead to the decoupling of the inner and outer

magnet assemblies. As a result, eddy currents may be

induced on the inner and outer magnet assemblies and

an inadmissible temperature rise may occur.

The situation is to be remedied by providing appropri-

ate monitoring facilities. See Section 5.6.

The plant NPSH value (NPSHA) should be minimum

0.5 m higher than the NPSH value of the pump

(NPSHR) to prevent a lack of lubrication or dry-running

of the plain bearings.

2.6.3 Chargeable liquids

For

operation

with

chargeable

-8

conductivity < 10

S/m inert gas must be used for

flushing during drain. See also Section 6.3.

9430-005-en

Revision 03

TM 10456

Edition 06/2022

2.6.4 Identification

Example of the identification of the pump section:

For assembling the pump with components which are

not explosion-protected (e.g. motor, shaft coupling), it

is recommended to mask or remove the "potentially

explosive" identification from the pump component

and, if necessary, from other accessories.

In this case the declaration of conformity applies with-

out ATEX identification.

For surface temperatures that mainly depend on the

operating conditions of the pump, DIN EN ISO 80079-

36 Chapter 11.2 f) and g) state that no temperature

class or temperature may be specified. In this case, the

identification must include temperature range identifi-

cation (e.g. T4 ... T3 for gas or for dust D135 ° C ...

T200 ° C).

The temperature class must be determined by the op-

erator in accordance with Section 2.6.7 "Temperature

Limits".

2.6.5 Check of the direction of rotation

We recommend you to only perform a check of the

direction of rotation with with filled pump and with a

rotating field instrument. See also Section 6.1.2.

2.6.6 Mode of operation of the pump

The pump may only be started with the suction side

shut-off element fully opened and the discharge side

shut-off element slightly opened. Start-up against a

closed check valve is also possible. The discharge side

shut-off element is to be regulated to the operating

design point directly after run-up.