Richter BCV/F (ASME) Series Check Valves - Manual (Page 7)

Series CV/F, CVV/F, BC/F, BCV/F
Page 7
9550-050-en Revision 10
TM 8462 Edition 02/2012
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 explo-
sive area.
It is imperative to observe the individual points of
intended use for application in a potentially explosive
area.
3.1 Intended use
Improper 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 improper 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 re-
sult, 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 eli-
mination 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 temper-
ature as per the operating manual.
If the valve is heated (e.g. heating jacket), it must
be ensured that the temperature classes pre-
scribed in the Annex are observed.
To achieve safe and reliable operation, it must be
ensured in inspections at regular intervals that the
valve is properly serviced and kept in technically
perfect order.
Increased wear to the valve can be expected with
the conveyance of liquids containing abrasive con-
stituents. The inspection intervals should be re-
duced compared with the usual times.
Electric peripherals, such as temperature, pressure
and flow sensors etc., must comply with the valid
safety requirements and explosion protection pro-
visions.
The valve must be grounded.
This can be achieved in the simplest way via the
pipe screws using tooth lock washers.
Otherwise grounding must be ensured by different
measures e.g. a cable link.
Plastic-lined valves must not be operated with
carbon disulphide
.