Grundfos Vaccuperm VGA-146, Инструкция по установке и эксплуатации

Страница: 17 / 160

English (GB)
17
5.2 Checks before commissioning
Check tightness of the total plant before start-up.
– Observe manual of the gas dosing regulators!
5.2.1 Checking the tightness of pressure gas lines
Pressure gas lines are all lines from the gas containers to the
vacuum regulator.
• If the plant is equipped with a nitrogen rinsing device: Check
tightness roughly with nitrogen (all dosing media)
• Detailed checking: with ammonia
5.2.2 Checking the tightness with nitrogen
• Close all container valves
• Open container connection valves and all shut-off valves up to
the gas dosing system
• Open the connection valve of the nitrogen cylinder
• Slowly open the valve of the nitrogen cylinder, until the lines
have a pressure of about 10 bar (read at the manometer of the
vacuum regulator).
• Apply leakage spray or soap water to all components under
pressure
– Formation of bubbles and/or pressure drop at manometer
--> Leakage in pressure lines!
• Depressurize the plant!
• Eliminate leakage!
• Check tightness again!
– No formation of bubbles, pressure at manometer does not
drop significantly within one hour
-->
Pressure lines are tight.
5.2.3 Checking the tightness with ammonia
• Open all container valves and container connection valves and
quickly close them again
• Slowly pass the open ammonia bottle along pressure-gas
leading parts
– Formation of white mist: Leakage in pressure lines!
• Depressurize the plant!
• Eliminate leakage!
• Check tightness again!
Fig. 15 Formation of white mist: Leakage in pressure lines!
– No formation of white mist: Pressure lines are tight.
Fig. 16 Pressure lines are tight
Fig. 17 Liquid ammonia makes leakages by corrosion
6. Operation
6.1 Function
• Reducing the gas pressure (overpressure) to subatmospheric
pressure (vacuum)
• In case of too high pressure in the device (e. g. if the inlet
valve is soiled or damaged) the overpressure valve opens.
– Gas will be lead to the absorption vessel.
• In case of the gas container getting empty or blocked gas
supply (too high vacuum in the device) the vacuum shut-off
valve closes.
– Gas containers will not be evacuated with the injector
vacuum.
• Liquid trap (option)
– Prevents liquid gas from getting into the vacuum regulator
– The temperature is self-regulating to max. 60 °C.
6.2 Display Elements
• Pressure gauge (option)
– displays the gas pressure at the inlet (admission pressure)
– optionally with a limit contact for minimal admission
pressure, e.g. empty signal is sent to the control panel.
6.3 Operating
• Observe manuals of the other components.
Warning
Check the tightness not until the total plant is ready
for start-up.
Danger of gas leakage!
Warning
Before checking the tightness:
Start running the optional built-in liquid trap or the
seperate liquid trap!
Danger of gas leakage!
Warning
Maximum nitrogen pressure 16 bar!
Danger of damages and gas leakage when being
exceeded!
TM
0
4
0
849
0
908
TM
04 069
7 090
8
Warning
Liquid ammonia must not come in contact with parts
of the plant!
Danger of leakages by corrosion!
T
M
04
06
98
09
08
Warning
Do not exceed the admission pressure!
Danger of gas break-out!
Note
The device is passive. All adjustment has to be made
at other parts of gas break-out!