Monitoring, Circulating Liquid And Ventilation - Grundfos NK Serie Instrucciones De Instalación Y Funcionamiento

5.2 Monitoring, circulating liquid and ventilation

Shaft seal
Type of unit
arrangement
Single shaft
Pump unit
seal
Pump unit
Double shaft
seal
Auxiliary unit
1)
Pressureless: The pumped liquid will continuously leak into the auxiliary system liquid, the maximum
leakage is 1.5 ml per hour, and may fill the auxiliary system.
2)
Pressurised: The barrier liquid will continuously leak into the pumped liquid, the maximum leakage is 1.5 ml
per hour. The liquids must be compatible.
3)
Circulating: circulating liquid.
A temperature increase of 7-10 K across the shaft seal chamber and a maximum outlet temperature of 70
°C must be maintained. This ensures correct function of the shaft seals.
If circulation is lost, the temperature of the barrier or flushing liquid will increase.
4)
See the table below for text code descriptions.
10
Solution
Pressureless
Dead-end
Pressurised
Pressureless
3)
Circulating
Pressurised
Type of pumped
liquid
Non-flammable
Flammable
Non-flammable
Flammable
Non-flammable
1)
Flammable
Non-flammable
2)
Flammable
Non-flammable
1)
Flammable
Non-flammable
2)
Flammable
Text
EPL
4)
code
Gc/Dc 1, 10
Gb/Db 2, 10
Gc/Dc 2, 11
Gb/Db 2, 11
Gc/Dc 1, 10
Gb/Db 2, 10
Gc/Dc 2, 11
Gb/Db 2, 11
Gc/Dc 3, 10
Gb/Db 3, 10
Gc/Dc 3, 10
Gb/Db 4, 11
Gc/Dc 5, 10
Gb/Db 6, 10
Gc/Dc 5, 11
Gb/Db 6, 11
Gc/Dc 3, 7, 10
Gb/Db 3, 7, 10
Gc/Dc 4, 8, 11
Gb/Db 4, 8, 11
Gc/Dc 5, 7, 10
Gb/Db 6, 8, 10
Gc/Dc 5, 7, 11
Gb/Db 6, 8, 11