BUSCH Seco SG 0008 A, Installation And Operating Instructions Manual

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Seco SG 0008 A
0870162612 /
190709
page 3
Product Description
Use
The vacuum pump is intended for
−
the suction
of
−
potentially explosive fuel-air mixtures according to the
EC-Type-Examination Certificate.
Conveying media with a lower or higher density than air leads to an
increased thermal and/or mechanical load on the vacuum pump and is
permissible only after prior consultation with Busch.
Max. allowed temperature range of the inlet gas: -30 … 50 °C
If the machine is installed at an altitude greater than 1000 meters above
sea level:
♦
Contact your Busch representative, the motor should be de-
rated or the ambient temperature limited.
The vacuum pump is thermally suitable for continuous operation (100
percent duty).
In case of intermittent operation (S3) observe the max. permissible
number of startings per hour: 60
According to the directive 2014/34/EU the vacuum pump is made for
the intended use in potentially explosive areas.
According to this directive the vacuum pump is inside a category 1 de-
vice (suitable for connection to tubings the inside of which is classified
as zone 0). Outside the vacuum pump is approved as category 2 device
(for use in zone 1).
According to the EC-Type-Examination Certificate issued by the
German "Physikalisch-Technische Bundesanstalt" (PTB) the vacuum
pump may be used for the conveyance of explosive atmospheres con-
sisting of a mixture with air and flammable gases, provided that the
gases belongs to the temperature classes T1 to T3 and to the explo-
sion groups IIA according to EN ISO 80079-36.
The vacuum pump is suitable for placement in an environment where
potentially explosive atmosphere as mixture out of air and flammable
gases, vapors or mists likely to occur in normal operation occasionally
(zone 1) provided that the gases belongs to the temperature classes T1
to T3 and to the explosion groups IIA according to EN ISO 80079-36.
Additionally, the vacuum pump complies with the requirements of an
autonomous protection system and can be used as flame arrestor be-
tween nozzle and storage tank.
The approval for use in potentially explosive atmospheres is valid for
the vacuum pump together with the described measurement and
safety equipment. The approval is void if the system is altered or if the
scheduled maintenance is not complied with. Maintenance must be
performed by specifically instructed personnel only.
Safety Concept
The safety concept for the vacuum pump Seco SG 0008 A for use in
potentially explosive atmosphere as a category 1 device (inside) and
category 2 device (outside) is based on two safety principles being in-
dependent from each other:
1. Avoidance of ignition caused by an electric or non-electric ignition
source inside or outside the vacuum pump.
The drive motor is equipped with a motor protection relay, which pro-
tects the drive motor against thermal overload. After a cool down the
motor starts self-acting. The drive motor must additionally be pro-
tected against overload of the vacuum pump by a motor safety switch.
In order to avoid an ignition an earthing connection (e) of the vacuum
pump is intended additionally to the protective earth conductor of the
drive motor.
2. Avoidance of hazards to persons and goods from the effects of an
explosion that might happen inside the vacuum pump despite the
mentioned safety precautions.
−
Pressure proof design of the vacuum pump, capable of resisting
an explosion without bursting.
−
The suction connection and the gas discharge feature flame ar-
restors (d) (h), preventing flashbacks into the suction side and
the discharge side of the system.
3. In case of using the vacuum pump as gas recovery pump between
nozzle and storage tank the vacuum pump complies with the require-
ments of an autonomous protection system (flame arrestor) and
avoids flame expansion from the direction of the nozzle through the
vacuum pump to the neighbouring nozzle or storage tank of the pet-
rol. To use the vacuum pump as an autonomous protection system,
make sure that the following installation conditions will comply.
Max. permitted length of hoses or pipes between nozzle and suction
connection thread G3/8 of the vacuum pump:
−
by using a gas recovery hose with inner diameter
≤
10 mm in co-
axial hose:
≤
6 m
a Motor
b Nameplate, vacuum pump
c Suction connection
d Flame arrestor,
suction side
e earthing connection
f Bypass valve
g Gas discharge
h Flame arrestor,
discharge side