3M MEMBRANA Liqui-Cel, Инструкция по уборке

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Liqui-Cel
®
Membrane Contactors Cleaning Guidelines
21
X. Membrane Contactor Integrity Test
There are three conditions which will cause the contactor to leak.
Membrane wet-out
A fiber break
O-ring / seal failure
Membrane wet-out can occur when solutions containing surfactants or proteins, such as beer,
juice, wine, fermentation broth or other organic solutions pass through the contactor. This is
typically a reversible condition once the contactor is cleaned. An integrity test can be performed to
verify the restoration of the
hydrophobic property. This test involves pressurizing the
shellside with water and measuring the drip rate leaving the lower lumenside port. The integrity
test should be completed after cleaning.
Table 9: Membrane Contactor Integrity Test
Steps
1.
Relieve lumenside pressure. Blow-out lumenside stream with nitrogen or oil-free air. Open the lower lumenside
port connection so an observation can be made.
2. Close the shellside outlet valve.
3. Fill the shellside with filtered (10-micron) water. Slowly apply 60 psig (4.2 kg/cm
2
) pressure to the shellside.
4. Measure the drip rate from the lumenside port for 1 hour.
5.
Release the shellside pressure by slowly opening the outlet valve.
Drain the contactor.
When the liquid side of contactor is pressurized with water but no strip medium is applied to the
gas side, it is normal for a small amount of liquid water to transmit from the shellside to the
lumenside and exit through the lumenside port. To establish a baseline, this drip rate can be
compared to a new contactor. The drip rates will depend on the fiber type. Table 11 provides a
guideline for typical drip rates during normal operating conditions at ambient temperatures.
If the contactor drips at a higher rate than the value listed in Table 11, either the cleaning protocol
needs to be repeated, a fiber is broken or a seal is damaged. Contact a 3M representative for
additional help.
Table 10: Typical Drip Rates Out of Lumen side Port
Fiber Type X50 Fiber X40 Fiber XIND
Condensation Rate
Per m
2
of active membrane area)
0.8 to 1.6 ml/hr 0.2 - .4 ml/hr 0.8 to 1.6 ml/hr