Richter RG4 stationary, double User Manual download pdf (Page 4)

Series SCK Mechanical seal RG-4, stationary, double, liquid sealed Page 4

9220-064-en Revision 10

TM 7827 Edition 03/2010

The supply pressure is measured in bar at the pump

suction nozzle. If no measuring point is available, the

supply pressure can be calculated using the following

formula.

Using the same formula, the delivery pressure at

Q=0 m

/h can be determined with the pump

characteristic curve.

2,10

)(kg/dm x(mFS) H

=(bar) p



p = supply pressure or delivery pressure

H = supply height or delivery head



= density

Are the available connections correctly made?

SE - quench or sealing medium inlet

SA - quench or sealing medium outlet

See also sectional drawing in Section 7.2

4.3 Improper operation and their

consequences (examples)

Improper operation, even for a short time, can

result in serious damage to the unit.

In connection with explosion protection,

potential sources of ignition (overheating, electrostatic

and induced charges, mechanical and electric sparks)

may result from these inadmissible modes of

operation; their occurrence can only be prevented by

adhering to the intended use.

For examples, see installation and operating manual

SCK, Section 6.6

5 Maintenance

The regulations of the mechanical seal

manufacturer must always be observed.

See also the installation and operating manual

for the SCK series.

It is important to replenish in good time any sealing

liquid which has escaped and to monitor the sealing

liquid pressure. The minimum sealing liquid pressure

must never be undershot as long as the pump

housing is under pressure (refer also to the

description of the pressurisation system used and

Section 4.2.2

)

If the sealing liquid pressure is too high, this indicates

a defect in the mechanical seal even though the

mechanical seal on the atmosphere side is completely

tight. The pump must then be shut down so that no

serious damage occurs. Substantial damage generally

occurs if the aggressive process medium enters the

pressurisation system as a result of a drop in the

sealing liquid pressure to below the minimum

pressure.

If there is a risk that, for example, pressure surges

occur in the plant, precautions must be taken to

prevent damage. To this end, for example, the sealing

liquid pressure can be increased. However, this is

only possible up to the pressure limit of the

mechanical seal used.

5.1 Dismantling of a mechanical

seal RG-4, liquid sealed

Dismantling can be checked using the sectional

drawings in Section 7

and Section 9 of the

installation and operating manual SCK as well as the

components available.

5.1.1 Dismantling of back plate, impeller

and RG-4

 First of all relieve the mechanical seal by undoing

the attachment screws 901/5.

 Undo screws 901/6 and washers 554/6 of the

bearing pedestal / back plate.

 Move the back plate almost up to the impeller with

light hammer blows.

 Undo back plate (for instructions, see Sections

4.2.1 and 7.7.4 in the installation and operating

manual SCK).

 Move the back plate almost up to the impeller with

light hammer blows.

 Bearing pedestal group 3:

Labyrinth disc 555 must be secured with

two bolts prior to the dismantling of the

impeller. For this purpose there are 2 bores

Ø5mm in the bearing pedestal. The double

mechanical seal is relieved of pressure as a result.

See Dismantling in Sections 7.7.1 and 7.7.5

the installation and operating manual SCK.

 Loosen impeller 230 with a strap wrench or

assembly wrench. Right-hand thread.

For assembly aid for impeller, see Section 10.1

the installation and operating manual SCK.

 With some pump the work sequence is to be

repeated once or twice sizes so that the cup

springs 950/1 can be completely relieved.

 Then completely remove the impeller 230. Remove

the mating ring 475/1 and the flat gasket 400/1.

 Remove back plate (for sequence, see Sections

4.2.1 and 7.7.4 in the installation and operating

manual SCK) with centering ring 511, O-ring

412/3, seal face 472/1 and intermediate ring

509/1.

1 2 3 4 5 6 7

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Richter RG4 stationary, double User Manual Page 4

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