Richter SGS/F Series Sight Glasses - Manual (Page 5)

Series SGS
Page 5
9540-055-en Revision 01
TM 6744 Edition 04/2007
2.2 For the customer / operator
When using the cylindrical sight glass, it must be
ensured that
hot or cold sight glass parts are protected by the
customer against being touched
the sight glass has been properly installed in the
pipe system
the usual flow rates are not exceeded in continu-
ous operation.
This is not the manufacturer's responsibility.
Loads caused by earthquakes were not allowed for in
the design.
Fire protection to DIN EN ISO 10497 is not possible
(plastic lining and plastic components).
2.3 Improper operation
The operational reliability of the cylindrical sight glass
supplied is only guaranteed if it is used properly in
accordance with Section 2.1 of this operating manual.
The operation limits specified on the name
plate and in the pressure-temperature
diagram must under no circumstances be
exceeded.
3 Safety notes for applications in potentially explosive areas
based on the Directive 94/9/ EC (Atex 95)
The valves are intended for use in a potentially
explosive area and are therefore subject to the
conformity assessment procedure of the directive
94/9/EC (ATEX).
As part of this conformity assessment, an ignition
hazard analysis to EN 13463-1 to satisfy the funda-
mental safety and health requirements was conducted
with the following result:
The valves do not have any ignition source of
their own.
The valves are not covered by the scope of
application of the ATEX directive and therefore
do not need to be identified accordingly.
The valves may be used in a potentially
explosive area.
It is imperative to observe the individual points of
intended use for application in a potentially explosive
area.
3.1 Intended use
Inadmissible modes of operation, even for brief
periods, may result in serious damage to the
valve.
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.
Furthermore, reference is made in this connection to
the Directive 95/C332/06 (ATEX 118a) which contains
the minimum regulations for improving the occupa-
tional health and safety of the workers who may be at
risk from an explosive atmosphere.
A difference is made between two cases for the use of
chargeable liquids (conductivity < 10
-8 S/m):
1. Chargeable liquid and non-conductive lining
Charges can occur on the lining surface. As a
result, this can produce discharges inside the
valve. However, these discharges cannot cause
ignitions if the valve is completely filled with
medium.
If the valve is not completely filled with medium,
e.g. during evacuation and filling, the formation of
an explosive atmosphere must be prevented, e.g.
by superimposing a layer of nitrogen. It is
recommended to wait 1 hour before removing the
valve from the plant in order to permit the
elimination of static peak charges.
This means that, to safely prevent ignitions, the
valve must be completely filled with medium at all
times or else a potentially explosive atmosphere
must be excluded by superimposing a layer of inert
gas.
2. Chargeable liquid and conductive lining
No hazardous charges can occur as charges are
discharged direct via the lining and shell (surface
resistance
< 10 9 Ohm, leakage resistance < 10 6
Ohm)
Static discharges of non-conductive linings are
only produced through the interaction with a
non-conductive medium and are therefore the
responsibility of the plant operator.
Static discharges are not sources of ignition
which stem from the valves themselves!
The temperature of the medium must not exceed
the temperature of the corresponding temperature
class or the maximum admissible medium tem-
perature as per the operating manual.