Marking The Coupling Parts For Explosion Protection - Siemens Flender FLUDEX 4600 Series Operating Instructions Manual

In the standard design the fusing temperature of the fusible safety screw is 140 °C, and the material used
for the seals is Perbunan (for a maximum continuous operating temperature of 85 °C). As an extended
standard (for continuous operating temperatures of up to 110 °C and/or synthetic oil ), the coupling can be
fitted with seals made of Viton. In this case a fusible safety plug with a fusing temperature of 160 °C is used
in the coupling.
Couplings to be used in potentially explosive areas are designed with the fusible
safety plugs (103) permitted for the temperature class.
The fusing temperature of the fusible safety plugs is stamped on their end faces, the 140 °C plugs also
being marked red, the 160 °C plugs green.
For applications where frequent faults or locking of the drive may occur it is recommended that a thermal
monitoring system be provided. This will prevent the operating fluid from escaping and being lost and the
environment from being polluted and endangered. The transmitter (EOC system) or the thermal circuit
breaker (mechanical switching equipment) is screwed into the coupling flange in place of the screw plug
(163). The fusible safety plug (103) remains in the coupling as an emergency safety device.
A thermal circuit breaker with a fusing temperature of 110 °C can be used on a coupling with Perbunan
seals and a 140 °C fusible safety plug.
A thermal circuit breaker with a fusing temperature of 140 °C can be used on a coupling with Viton seals
and a 160 °C fusible safety plug.
A 160 °C fusible safety plug can be used with an EOC system (transmitter release temperature of 125 °C),
including with Perbunan seals.
The type FAO includes only the components of the fluid coupling (without attachment) and incorporates
a connection flange point on the output side. The types FAK/FAD/FAE/FAM are couplings with N­EUPEX
add­on coupling integrated on the output side for connecting two shafts. The types FAKB/FADB are
FAK/FAD couplings with a brake drum. The type FADS is a FAD coupling with brake disk. The type FAR
is a coupling with V­belt pulley on the output side.
In the flexible N­EUPEX add­on coupling the H­shaped Perbunan flexible elements are delivered in a
standard Shore hardness of 80.
Coupling with worn flexible elements (12) (for wear mark ΔS
be operated in potentially explosive areas.
5.3

Marking the coupling parts for explosion protection

Couplings which are intended for use in potentially explosive areas must bear the following
marking:
Flender GmbH
46393 Bocholt - Germany
FLENDER couplings FLUDEX <year built>
Marking of the fusible safety plug:
The N-EUPEX add-on coupling must have
12
II 2G c b IIB T3 -30 °C ≤ Ta ≤ +50 °C
II 2D c b T 160 °C -30 °C ≤ Ta ≤ +50 °C
I M2 c b -30 °C ≤ T
a
stamped on the hub parts.
, see section 10) must not
V
≤ +50 °C
FLUDEX 4600 en
Operating instructions 10/2017