27
ELRO
®
Pumps for hazardous materials GUP 3-1,5 and GP 20/10Ex
not just protections, but have additional
functions such as cooling, insulation, noise
reduction, splash protection, etc.
Some of these functions can be impaired or
may become totally ineffective by excessive
deposits of dirt.
Here some advice on how to remove dirt.
n
Dried on dirt can be removed by
scratching, scraping or brushing
n
Minor dirt deposits, such as layers of
dust and fine deposits can be wiped
off, cleaned off with a vacuum cleaner,
removed with a brush or broom
5.2
Replacing the pumping hose
The installed HYPALON hose is
characterized by a high chemical resistance
against most fluids.
By experience the chemical resistance
of the hose is sufficient for the quantities
involved in accidents with hazardous
materials, even in extreme cases.
However, the resistance must be checked
before the use with hazardous materials!
The pumping hose must generally be
replaced after each use with hazardous
material.
5.2.1 Removing the pumping hose
1. Switch off the pump and disconnect it
from the electric power supply (pull out
the mains plug)
2. Empty the pump hose completely.
3. Stand the pump with the pump cover
facing forward. Place a container to
collect the sliding fluid.
4. Loosen and unscrew four nuts (part-
no.1016, Fig. 13) from the pump cover.
Take off the washers.
5. Take the pump cover carefully off, let
the sliding fluid flow into the container.
If the pumping hose is
damaged, pumped medium and
sliding fluid may have mixed.
In this case the inside of pump
housing and cover must be
cleaned. After changing the
hose the sliding fluid must be
refilled.
6. Unscrew the rotor retaining screw (part-
no. 1018, Fig. 116).
Press off the rotor off by using the M10
forcing bores and the retaining screw
(arrow Fig. 16).
7. Loosen and remove both holding
clamps and pumping hose (Fig. 17).
Fig. 16 Disassembly of rotor
