GEA RedGenium, Инструкция по эксплуатации, Страница: 76 / 118

A record should be kept of the leak test, noting the pressure in the pipes tested,
the ambient temperature and the outside temperature in the shade at hourly inter-
vals.
The removed measuring and control instruments should be reinstalled after com-
pletion of the leak test and if there are no leaks in the product.
Test strategy
Dry nitrogen is used as the test medium. After reaching the test pressure, the
pressure drop is measured via the differential pressure measurement. This may
only change by 0.02 bar within an hour. If the display device does not indicate a
leakage through foam formation, the system is sealed.
Testing devices
A pressure gauge with an accuracy of 0.5 % over the entire measuring range,
with a digital resolution of 0.01 bar must be used for the measurement.
The test procedure described here refers to pressure gauges with gauge and
LEAK modes from Keller.
Display devices
A foaming agent must be used as the means to indicate leakages. A solution of
50 parts water and 1 part detergent can be used as the foaming agent. Leakage
is detected by formation of foam. A leak detection spray can be used in problem
areas.
Carrying out the test
1.
Wet all connecting joints (welded seams, flange connections, screw fasten-
ings, etc.) with foaming agent.
2. Remedy any leakages detectable from the noticeable formation of foam.
Caution!
Do not damage the gasket in the valve insert!
► To prevent damage to the valve insert, vent the low pressure side after
pressure-testing the system, or the valve must be fully open during the pres-
sure test and during venting.
► If the control (GEA Omni™) is operational, the valve can also be opened
via the service menu.
7.5.3 Drying, vacuum
After the pressure test has been completed, the system must be evacuated and
undergo a vacuum test for 3 hours. Evacuation is used to remove air and mois-
ture from the installation.
A vacuum pump must be used for evacuation.
The permissible increase in pressure is 6.66 torr over a period of 3 hours.
Start-up
First start - Start-up procedure
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76 19.12.2019