Checking The Tightness; Checking The Pressure Connections (After Changing Gas Cylinder) - Grundfos VGA-113-110 Instrucciones De Instalación Y Operación

5.2.2 Checking the tightness

Warning
Liquid ammonia must not come in contact with parts
of the plant!
Danger of leakages by corrosion!
Fig. 19 No liquid ammonia
5.2.3 Checking the pressure connections (after changing gas
cylinder)
• Open the cylinder valve and quickly close it again.
• Slowly pass the open ammonia bottle along gas-leading parts.
– Slightly press the bottle in a pumping manner, allowing the
ammonia mist to rise up.
– Formation of white mist: Leakage at the pressure
connection!
• Depressurize the plant!
• Eliminate leakage!
• Check tightness again
Formation of white mist --> pressure connection is not tight
Fig. 20 Ammonia + chlorine gas --> formation of white mist
No formation of white mist --> pressure connection is tight
Fig. 21 No chlorine gas --> no formation of white mist
Checking the inlet valve
• Remove the union nut at the overpressure connection and
take off the overpressure line.
• Close the rate valve.
• Open the cylinder valve.
• Slowly pass the open ammonia bottle along the overpressure
connection.
– Slightly press the bottle in a pumping manner, allowing the
ammonia mist to rise up.
– Formation of white mist: The inlet valve is not tight!
• Depressurize the plant!
• Check the inlet valve and repair it!
• Check tightness again
Formation of white mist --> the inlet valve is not tight!
VGB-103
Fig. 22 Ammonia + chlorine gas --> formation of white mist
No formation of white mist --> the inlet valve is tight!
✓
VGB-103
Fig. 23 No chlorine gas --> no formation of white mist.
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