Richter KNAP-S/F Series Ball Valves (ASME) - Manual (Page 8)

Series KNA/F, KNAP/F,
KNA-S, KNAP-S
9520-080-en_USA Revision 10
TM 8361 Edition 10/2011
3 Safety notes for applications in potentially explosive areas
based on the Directive 94/9/ EC (A
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
fundamental safety and health requirements was
conducted with the following result:
The valves do not have any ignition source of
their own and can be operated both manually
as well as mechanically/electrically.
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.
Supplementary notes:
Electric/mechanical actuators must be
subjected to their own conformity assessment
to ATEX.
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 unit.
In connection with explosion protection, p
sources of ignition (overheating, electrostatic and
induced charges, mechanical and electric sparks)
may result from these improper operation
occurrence can only be prevented by adhering to
the intended use.
Furthermore, reference is made in
the Directive 95/C332/06 (ATEX 118a) which contains
the minimum regulations for improving the occup
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
chargeable liquids (conductivity <10
1. Chargeable liquid and non-c
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 m
dium.
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.
, KNA-D/F, KNAP-D/F,
S, ASME
applications in potentially explosive areas
ctive 94/9/ EC (ATEX)
e in a potentially
e subject to the
e of the directive
sment, an ignition
1 to satisfy the
requirements was
gnition source of
ed both manually
cally.
by the scope of
tive and therefore
cordingly.
in a potentially
ors must be
rmity assessment
ndividual points of
otentially explosive
rief periods, may
nit.
otection, potential
electrostatic and
d electric sparks)
r operation; their
ed by adhering to
this connection to
8a) which contains
oving the occupa-
ers who may be at
ases for the use of
-8 S/m):
conductive
ng surface. As a
harges inside the
ges cannot cause
tely filled with me-
illed with medium,
g, the formation of
be prevented, e.g.
gen.
It is recommended to
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 atmos
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
only produced through the interaction with a non
conductive medium and are therefore the respo
sibility of the plant operator.
Static discharges are not sources of ignition which
stem from the valves themselve
The temperature of the medium must not exceed
the temperature of the corresponding temperature
class or the maximum admissible medium tempe
ature as per the operating manual.
If the valve is heated (e.g. heating jacket), it must
be ensured that the temp
scribed in the Annex are observed.
To achieve safe and reliable operation, it must be
ensured in inspections at regular intervals that the
unit is properly serviced and kept in technically
perfect order.
Increased wear to the valve can b
the conveyance of liquids containing abrasive
constituents. The inspection intervals are to be
reduced compared with the usual times.
Actuators and electric peripherals, such as
temperature, pressure and flow sensors etc., must
comply with the valid safety requirements and
explosion protection provisions.
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 other
action, e.g. cable bridges.
Attachments such as actuators, position contro
lers, limit switches etc. must satisfy the relevant
safety regulations as regards explosion protection
and, if required, be designed in compliance with
ATEX.
Special attention must be paid to the appropriate
safety and explosion protection notes in the r
spective operating manuals.
Plastic-lined valves must not be operated with
carbon disulphide.
Page 8
xplosive areas
to wait 1 hour before removing
plant in order to permit the
peak charges.
o safely prevent ignitions, the
pletely filled with medium at all
tentially explosive atmosphere
y superimposing a layer of inert
d and conductive lining
dous charges can occur as
re discharged direct via the
d shell (surface resistance
leakage resistance
of non-conductive linings are
ugh the interaction with a non-
and are therefore the respon-
perator.
e not sources of ignition which
s themselves!
the medium must not exceed
the corresponding temperature
um admissible medium temper-
rating manual.
d (e.g. heating jacket), it must
he temperature classes pre-
x are observed.
d reliable operation, it must be
ons at regular intervals that the
rviced and kept in technically
he valve can be expected with
f liquids containing abrasive
nspection intervals are to be
with the usual times.
ectric peripherals, such as
re and flow sensors etc., must
alid safety requirements and
provisions.
rounded.
ed in the simplest way via the
ooth lock washers.
g must be ensured by other
dges.
as actuators, position control-
etc. must satisfy the relevant
s regards explosion protection
designed in compliance with
ust be paid to the appropriate
on protection notes in the re-
manuals.
must not be operated with