Richter MNKA Series (ASME) User Manual download pdf (Page 16)

Series MNKA, acc. to ASME Page 16

9250-050-en Revision 11

TM 7903 Edition 07/2010

7 Maintenance

7.1 Screw connections of the

housing (casing)

After initial loading by the operating pressure and

operating temperature the tightening torques of all

connection screws must be checked at the following

points:

 housing (casing) flange

 suction flange

 discharge flange

See also

Section 6.1.1, para. 1.

7.2 Bearing pedestal

The temperature of the bearing pedestal is

not to exceed more than 122 °F (50 °C) and

under no circumstances 176 °F (80 °C).

If higher temperatures do occur, call in qualified staff

without delay. If this is not possible, the pump must be

shut down and taken out of service.

In many cases a vibration measurement is

recommended to detect bearing wear in good time.

7.2.1 Grease for life lubrication

Grease fill bearings of the series 2RS are installed as

standard features. The grease is lithium-saponified.

The admissible temperature range is – 22 °F to 230 °F

(– 30 °C to + 110 °C).

The rolling bearings are designed for an L

service

life of > 17,500 hours. The service life of the grease

filling guaranteed by the bearing manufacturers is

given in the following table.

Size Bearing size > Service life

Group 1 6207-2RS / 15000 hr*

Group 2 6210-2RS / 15000 hr*

* at bearing temperature < 122 °F (50 °C)

at bearing temperature 158 °F (70 °C) approx. 7500 hr

If the pump is serviced, it is recommended to also

replace the bearings as a precaution.

In potentially explosive works it is

advisable to monitor the condition of

the rolling bearings.

7.2.2 Oil bath lubrication

We recommend a mineral oil with the following

characteristics for an expected bearing temperature of

about 158 °F (70 °C):

Viscosity index : approx. 85

Kinematic viscosity at 104 °F (40 °C)

40.appr

A fully synthetic gear oil to ISO VG 220 is to be used

for temperatures below – 68 °F (– 20 °C).

Replacing the bearings: The ball bearings are

designed for an L

service life of >17,500 hours.

We recommend 17.500 working hours respectively

every 3 years a change of bearing should be made.

Oil changes: 1x per year at bearing temperatures of

about 122 °F (50 °C).

Every 6 months at bearing temperatures of about

158 °F (70 °C).

At higher temperatures more frequently in accordance

with the regulations.

When the pump is serviced, it is recommended to

replace the bearings and shaft seals as a precaution

and to pour in fresh oil.

Oil level check: The oil level is to be regularly

checked on the constant level oiler

638/1 to ensure

safe operation.

It must be ensured that there is always oil in the

constant level oiler; it must under no circumstances be

completely drained.

In potentially explosive works it is

advisable to monitor the condition of

the ball bearings

If there is a suspicion that splash water could have

entered the bearing pedestal, the oil must be replaced

immediately. Even small amounts of water in the oil

reduce the service life of the ball bearings to a fraction

of the normal service life.

7.3 Cleaning

Care must be taken when cleaning the pump to

ensure that it is not exposed to a strong water jet.

The ingress of water into the bearing pedestal will

substantially impair bearing lubrication.

7.4 Stand-by pumps

If a pump is on stand-by, it is to be started up from

time to time. Regularly turn the shaft by hand in the

direction of rotation.

This operation is to be performed more often for

pumps which are exposed to very strong vibrations

from the plant.

When dismantling the pump from the plant, drain it,

thoroughly clean it, seal with flange covers and store

in accordance with the instructions.

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Richter MNKA Series (ASME) User Manual Page 16

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