Speck Pumpen Vakuumtechnik GmbH
zertifiziert: DIN EN ISO 9001
Supplementary Operating Instructions for Explosion Protection
10
7.2 Starting up / Operation / Shutdown
Compressors for the conveying of potentially explosive gas- and vapour-mixtures may initially be put into
operation, if all assembly components corresponding to the requirements of the manufacturer of the
individual components as well as the overall requirements of the compressor manufacturer were installed
and inspected in regard to their operability in detail as well as in the system and are thus fully capable of
functioning in terms of their provision.
7.2.1 General procedural method
• If an explosion danger already exists during the installation of the compressor or if a magnet-coupled
execution is entailed in the installed liquid-ring machine, the inspection in a rotational direction may
not take place under dry conditions. That concerns both the hydraulic area and the sealing areas of
double-action slide ring gaskets.
• A potential equalization for the total system according to EN 50014:2000 section 15 and further
applicable regulations must be ensured.
• The anti-cavitation protection pipe must be installed and be operational.
• Foreign particles from ferrous material may not get under the coupling protection. Danger of spark
formation.
• The operation with closed shut-off equipment in the suction- and pressure-pipes is not permissible.
7.2.2 Sufficient supply with operating liquid
After inspection for the absence of malfunction, the clearance to start by LS- 01 or LS- 02 (comp. Fig. 7.1)
and the start of the liquid-ring compressor, the appropriate time lag is necessary for the activation of the
flow-rate switch FS- 04. The time lag depends on the size of the compressor, the intake pressure and the
viscosity of the operating liquid. It is between 5 s and 90 s.
The volumetric currents of the operating liquid depend on the size of the compressor, the operating liquid
used and the operating parameters. The switching points of the switch FS- 04 are therefore to be
adjusted (see data sheet). The following table shows the switching ranges for water as the operating
liquid with a differential of at least 600 mbar between suction- and operating liquid-pressure.
VH
20
VH
40
VH
60
VH
110
VH
140
VH
180
VH
300
VH
350
VH
400
VH
500
VH
600
VH
800
VH
1200
VH
1600
VU
20
VU
40
VU 80
VU
140
VU
220
VU
300
VU
450
VU
500
VU
600
VU
800
VU
1200
VU
1600
VZ
30
VZ
50
VZ
110
VZ
140
VZ
180
VN 95
VN
125
VN
180
V
6
V/V
G
30
V/V
G
55
V/V
G95
V/VG
130
V/VG
155
V/VG
255
V
330
V
430
Compressor-size
VI 2 VI
8/15
VI
30
VI
55
Switching point
FS- 04
[l/min]
0,5
to
1,0
1,0
to
2,0
3,5
to
5,0
3,5
to
5,0
6,5
to
10
9,0
to
13,5
9,0
to
13,5
9,0
to
13,5
10
to
18
10
to
18
10
to
18
12
to
22
12
to
22
20
to
60
20 to
60
20 to
60
Tab. 7.1 Amounts of operating liquid in the liquid-ring compressors
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