NETZSCH NEMO - Materials; Mechanical Seal of Immersion Pumps; Noise Development; Shaft Bearings

Continued Page 1.5
1 SAFETY PRECAUTIONS
PAGE
1.4R
Revision: 1 Date Name Signed
Substitute for issue issued 23.10.03 Mangel
of 17.06.03 approved 24.10.03 Denk
text no. 30100
released 24.10.03 Denk
copy to: 95
GB
11. Shaft bearings
(concerning the pump types SY / SH / SA / SO / SF / SP)
Replacement of the bearings after 14,500 operating hours (according
to prEN 13463-5: replacement after 90 % of the designated service life).
12. Materials
Although being allowed as material for the pumps, aluminum should
be avoided in potentially explosive areas.
The pumps may only be used if, under the particular operating conditions,
the materials are resistant to mechanical and/or chemical influences or
corrosion such that the explosion protection will be maintained.
13. Noise development
(concerning the pump types SO / BO / SF / BF / SP / BP)
As soon as unusual noises (such as knocking or rubbing) are realized,
the pump is to be switched off. The cause of the failure is to be
eliminated before the pump is reoperated.
Regular check of the paddle equipment.
14. Direction of flow of immersion pumps
The direction of flow of immersion pumps always has to be from the end
connection piece to the pressure nozzle at the top. The reverse direction
of flow is not allowed.
15. Mechanical seal of immersion pumps
Before the initial startup and after a prolonged shutdown, the mechanical
seal is to be lubricated from outside before the pump is started. In this
connection, the compatibility of the lubricant with the sealing material
is to be considered.
16. Impurities in immersion pumps
Especially in the case of hand-operated movable immersion pumps it is
to be seen to it that no impurities can get into the pump. The pumps
are to be deposited only on clean and solid ground or else to be suspended.
In case of unusual noises or power losses, the immersion pumps are to be
switched off immediately.
17. Gland
If a gland packing is applied it has to be observed that the permitted
temperature corresponding to the temperature category is not exceeded.
Recommendation: fasten the screws of the stuffing box gland only
with low torque (approx. 5 Nm).