Application Note Preparation, Use, and Integrity T

Application Note Preparation, Use, and Integrity T
Application Note
USTR 2512
Preparation, Use, and Integrity Testing of
Pall Ultipor® VF DV20 Filter Cartridges
and Capsules
Table of Contents
Table of Contents
1. Basic Recommendations for Use.......................................................................... 1
1.1 Introduction......................................................................................................................... 1
1.2 Typical Process Steps ........................................................................................................... 1
2. Filling Procedures................................................................................................ 2
2.1 T-Style Configurations......................................................................................................... 2
2.1.1 Stainless Steel Filter Housing (e.g., Pall Advanta ALT) ......................................................2
2.1.2 T-Style Capsule Filter (e.g., Kleenpak™ Nova Capsule)......................................................3
2.2 In-Line Configurations ........................................................................................................ 3
2.2.1 Stainless Steel Filter Housing (e.g., Pall Advanta In-Line)..................................................4
2.2.2 In-Line Capsule Filter (e.g., In-Line (e.g., Kleenpak Nova or Novasip Capsule) ................5
3. Preparation for Pre-use Integrity Testing ............................................................ 6
3.1 Flushing Using a Pump Arrangement .................................................................................. 6
3.1.1 Pump Selection..................................................................................................................6
3.1.2 Flushing Pressure ...............................................................................................................6
3.2 Flushing Using a Pressure Arrangement ............................................................................... 6
4. Pre-use Integrity Testing ..................................................................................... 7
5. Conditioning the Filter for Processing................................................................. 7
6. Processing ........................................................................................................... 8
6.1 Processing Using a Pump Arrangement................................................................................ 8
6.2 Processing Using a Pressure Arrangement ............................................................................ 8
7. Minimizing Product Loss .................................................................................... 8
8. Preparing Filters for Post-Use Integrity Testing .................................................. 8
9. Post-use Integrity Test Flushing .......................................................................... 9
9.1 Flushing Using a Pump Arrangement .................................................................................. 9
9.2 Flushing using a Pressure Arrangement................................................................................ 9
10. Post-use Integrity Testing ................................................................................. 9
11. Further Guidance for Integrity Testing ............................................................. 9
11.1 Failure Analysis/Troubleshooting....................................................................................... 9
12. Typical Flush Volumes for Pall Ultipor VF DV20 Filters and Capsules........... 10
13. Filter Return Procedure................................................................................... 10
14. Frequently Asked Questions ............................................................................ 11
15. Customer Service............................................................................................. 13
Table of Contents
Page i
List of Figures
List of Figures
Figure 1: Pall Advanta T-Line Filter Housing ...................................................................................2
Figure 2: Kleenpak Nova Capsule in a T-Style Configuration ..........................................................3
Figure 3: Pall Advanta Filter Housing in an Inverted Position...........................................................4
Figure 4: Pall Advanta Filter Housing in a Standard Position............................................................4
Figure 5: Pall In-Line Kleenpak Nova Capsule Filter in an Inverted Position ....................................5
Figure 6: Pall Novasip Capsule Filter in a Standard Position ............................................................5
List of Tables
Table 1: Minimum Filling Time .....................................................................................................2
Table 2: Typical Flush Volumes for Pall Ultipor VF DV20 Filters and Capsules...........................10
Table 3: Prefilter Recommendations..............................................................................................12
Page ii
Preparation, Use, and Integrity Testing of Pall Ultipor VF DV20 Filter Cartridges and Capsules
Basic Recommendations for Use
1. Basic Recommendations for Use
1.1 Introduction
The information contained within this guide is intended for guidance only. It contains a set of recommendations for a
basic mode of operation and is not intended to discuss all possible process variables. For more information or technical
support, see Section 15: Customer Service on page 13.
Pall Ultipor® VF DV20 filters are direct flow filters that remove viruses essentially by size exclusion. Due to the small pore
size required to remove viruses, these filters exhibit lower liquid flow characteristics when compared to filters and capsules
utilizing sterilizing-grade membranes. These lower flow rates influence several aspects of use including wetting and
subsequent operation.
Pall can also provide fully automated integrated virus filter systems that provide the highest level of process safety and
efficiency. These systems offer precise and consistent automated process steps for improved process efficiency and reduced
labor costs.
1.2 Typical Process Steps
A typical process flow includes but may not be limited to:
1.
2.
3.
4.
5.
6.
7.
8.
Filter installation[1]
Filter filling
Filter wetting and flushing
Pre-use integrity testing
Process filtration
Product recovery by flushing with a compatible fluid
Filter wetting
Post-use integrity testing
Ultimately, the procedures used must satisfy any process-specific validation requirements.
(1) Detailed assembly, installation and sterilization procedures (if required) are described in the Pall publications listed under
Assembly and Installation on page 13 in Section 15: Customer Service.
Typical Process Steps
Page 1
T-Style Configurations
2. Filling Procedures
The first contact of the filter with process fluids, wetting agents, or filling fluids needs to be carefully controlled to ensure
even and complete wetting at later stages.
Pall recommends that filling be implemented from bottom to top on a filter being held in a vertical position,
bubble free, in a time not faster than 5 minutes for a 10-inch high filter (Table 1).
Table 1:
Minimum Filling Time
Cartridge Size
Cartridge Type
Minimum Filling Time (min)
84 mm (3.3 in.)
CLM05
2
254 mm (10 in.)
AB1, NT6, NP6
5
508 mm (20 in.)
AB2, NT7, NP7
10
762 mm (30 in.)
AB3, NT8, NP8
15
Typical filter installations schemes that will allow ensuring correct wetting are described in Section 2.1: T-Style
Configurations on page 2 and Section 2.2: In-Line Configurations on page 3.
2.1 T-Style Configurations
2.1.1 Stainless Steel Filter Housing (e.g., Pall Advanta® ALT)
A typical configuration for filling a virus filter in a stainless steel housing (from a pump or pressurized vessel) is displayed
in Figure 1.
Figure 1: Pall Advanta T-Line Filter Housing
Vent
In
Out
Drain
Page 2
Preparation, Use, and Integrity Testing of Pall Ultipor VF DV20 Filter Cartridges and Capsules
Filling Procedures
2.1.2 T-Style Capsule Filter (e.g., Kleenpak™ Nova Capsule)
T-Style capsule filters should be assembled like stainless steel housings. An assembled T-Style Kleenpak Nova capsule is
shown as an example (Figure 2).
Figure 2: Kleenpak Nova Capsule in a T-Style Configuration
Vent
In
Out
Drain
2.2 In-Line Configurations
Installation of filters with an in-line configuration requires a careful attention. By positioning the housing or capsule with
the head down, filling can be done from bottom to top assuring optimum filling conditions. This position does not allow
full condensate removal during steaming, however, and should not be used if in-situ steaming is to be implemented.
When in-situ steaming is to be implemented for filter housings or Novasip™ capsules, in-line filters should be installed in
the standard position. However, in order to allow filter filling from bottom to top, the fluid should be admitted into the
housing through the lower drain connection (only during the filling operation). Figures 3 – 4 display typical
configurations.
In-Line Configurations
Page 3
In-Line Configurations
2.2.1 Stainless Steel Filter Housing (e.g., Pall Advanta In-Line)
Inverted Position
Figure 3: Pall Advanta Filter Housing in an Inverted Position
Out
Vent
Drain
In
Tubing Drain
Standard Position
Figure 4: Pall Advanta Filter Housing in a Standard Position
In
Vent
(Filling only)
Drain
Out
Page 4
Preparation, Use, and Integrity Testing of Pall Ultipor VF DV20 Filter Cartridges and Capsules
Filling Procedures
2.2.2 In-Line Capsule Filter (e.g., In-Line (e.g., Kleenpak Nova or Novasip Capsule)
Inverted Position (e.g., In-Line Kleenpak Nova Capsule)
Figure 5: Pall In-Line Kleenpak Nova Capsule Filter in an Inverted Position
Out
Vent
Drain
In
Tubing Drain
Standard Position (e.g., Novasip Capsule Filter)
Caution: Kleenpak Nova filter capsules cannot be in-situ steamed. Only Pall Novasip capsule filters are validated for
in situ steaming
Figure 6: Pall Novasip Capsule Filter in a Standard Position
Vent
Drain
In
Out
(Filling only)
In-Line Configurations
Page 5
Flushing Using a Pump Arrangement
3. Preparation for Pre-use Integrity Testing
While water as a wetting fluid may be acceptable for performing a pre-use integrity test, there can be process benefits from
the use of alcohol.
These benefits have been seen to include:
• reduced flushing time
• less need for filter retesting due to insufficient wetting
• increased sensitivity
Pall recommends, therefore, that where possible, filter integrity testing be performed using 0.1 μm prefiltered 30/70 v/v
isopropanol (IPA)/water or 20/80 ethanol (EtOH)/water as the wetting fluid.
The validation of, and the flushing recommendations for the integrity testing of Pall Ultipor VF DV20 filters, when wet
with water (30/70 v/v IPA/water or 20/80 v/v EtOH/water), is discussed in Validation and Flushing on page 13 in
Section 15: Customer Service.
3.1 Flushing Using a Pump Arrangement
3.1.1 Pump Selection
The chosen pump should be capable of providing approximately 3.5 barg (50.8 psig) at the required process flow rate. It
is also essential that flow and pressure do not pulsate during the flushing and processing operations. Such pressure
pulsations can have an adverse effect on wetting effectiveness by forcing air into the filtration media. In extreme
circumstances these fluctuations may damage the filters being flushed. Pall therefore recommends the Quattroflow* series
of pumps for these applications.
3.1.2 Flushing Pressure
The Pall publications mentioned above detail various pressure recommendations for the flushing of Ultipor VF DV20
filters using various fluids. In general, any wetting regime is enhanced with the application of higher pressures, these are
ultimately limited by the maximum pressure claims for the filters. Both inlet pressure and back-pressure increase the
effectiveness of the flushing regime by compressing and eliminating residual gas from the membrane construction.
1.
2.
3.
4.
5.
6.
7.
8.
Condition the filter as per Section 2: Filling Procedures on page 2.
Ensure that all air is purged from the housing using the appropriate vent valve.
Slowly increase the pump speed to generate an inlet pressure of 2.1 barg (30 psig).
When the pressure is stable, carefully close the downstream valve to apply back-pressure. Increase the back-pressure
until the inlet pressure and back-pressure are appoximately 3.5 barg (50.8 psig) and 1.5 barg (21.8 psig)
respectively.
Flush the filter for 20 minutes, adjusting pump speed and back-pressure to maintain the inlet and outlet pressure.
After 20 minutes open the back-pressure valve and wait for the outlet pressure to decay to ~0 bar.
Reduce the pump speed until the inlet pressure reads 0 bar.
Drain the excess fluid from the upstream side of the filter housing or capsule.
3.2 Flushing Using a Pressure Arrangement
There are issues that must be considered when fluid is transferred using a pressurized vessel. These include the dissolution
of gas into the flushing and process fluids during the extended pressurization of the reservoir during flushing. During the
transfer of these fluids, pressure changes can cause the dissolved gas to form micro-bubbles within the filtration media.
This may lead to localized partial non-wetting and subsequent integrity test failures.
It is recommended that this is evaluated at full scale as part of the process qualification.
Page 6
Preparation, Use, and Integrity Testing of Pall Ultipor VF DV20 Filter Cartridges and Capsules
Pre-use Integrity Testing
To minimize the dissolution of gas, Pall recommends that the reservoir is pressurized for the shortest possible period and
is sized appropriately to minimize the fluid area available for gas transfer.
1.
2.
3.
4.
5.
6.
7.
8.
Condition the filter as per Section 2: Filling Procedures on page 2.
Ensure that all air is purged from the housing using the appropriate vent valve.
Slowly increase the pressure on the wetting fluid reservoir to generate an inlet pressure of 1.5 barg (21.8 psig).
When the fluid exits the system, partially close the back-pressure valve. Adjust the reservoir pressure and backpressure valve to obtain appoximately 3.5 barg (50.8 psig) inlet pressure and 1.5 barg (21.8 psig) back-pressure.
Flush the filter for 20 minutes, adjusting the reservoir pressure and back-pressure valve to maintain the inlet and
outlet pressure.
After 20 minutes open the back-pressure valve and wait for the outlet pressure to decay to ~0 bar.
Reduce the reservoir pressure to 0 bar.
Drain the excess fluid from the upstream side of the filter housing or capsule.
4. Pre-use Integrity Testing
If testing offline,
1. Connect the integrity test instrument to the housing or capsule.
2. Ensure that all other upstream connections are closed or blanked using an appropriate blanking fitting.
3. Integrity test the filter using the integrity test data issued by Pall for the assembly under test.
Please refer to the user manual, Palltronic Flowstar XC Test Instrument Operating Manual (USD2005) for further
guidance.
If testing in-situ,
1. Ensure that the downstream side of the filter housing / capsule remains at atmospheric pressure. This is best
achieved by connection to suitably large volume or by being open to atmosphere via a sterilizing grade gas filter.
2. Isolate the upstream side of the assembly under test by closing the necessary valves immediately upstream of the
filter housing or capsule.
3. Connect the integrity test instrument to this isolated upstream volume. Appropriate connection points include the
filter housing, capsule, or connecting pipework.
4. Integrity test the filter using the integrity test data issued by Pall for the assembly under test.
5. Conditioning the Filter for Processing
While the exact requirements will depend upon the proposed process, in conjunction with full system draining, it is
recommended that the residual wetting fluid be displaced using a buffer that is compatible with the process fluid.
Studies using 30/70 IPA/water have shown that volumes in the order of 5 L /10-inch filter can reduce residual solvent
immediately downstream of a filter capsule to < 50 ppm.
Ultimately the removal of solvent should be determined using a simulated process with specific consideration being given
to the impact of additional downstream pipe-work, tubing or other connections that may not be free draining.
After flushing the filter housing/capsule should be drained using an appropriate drain valve.
Flushing Using a Pressure Arrangement
Page 7
Processing Using a Pump Arrangement
6. Processing
6.1 Processing Using a Pump Arrangement
1. Slowly increase the pump speed to fill the housing/capsule, allowing displaced air to vent using an appropriate vent
valve.
2. Close the housing vent valve when the housing or capsules are full.
3. Slowly increase the pump speed until the inlet pressure reaches the validated process pressure.
4. Adjust the pump speed to maintain the validated process pressure.
5. When processing is complete, stop the pump.
It is recommended that measurements of time, pressure and volume processed are recorded throughout the filtration
operation.
6.2 Processing Using a Pressure Arrangement
1. Isolate the reservoir from the filters by closing a valve immediately upstream of the filters.
2. Slowly increase the reservoir pressure to the validated process pressure.
3. Partially open the isolating valve until the housing/capsule is full, allowing displaced air to vent using an
appropriate vent valve.
4. Close the housing/capsule vent valve when the housing or capsules are full.
5. Fully open the isolating valve.
6. Process until the reservoir is empty.
7. Close the isolating valve and slowly depressurize the reservoir.
8. Depressurize the housing/capsule by slowly opening the housing/capsule vent valve.
7. Minimizing Product Loss
Where the process allows, yields can be maximized by allowing the residual process fluid to be recovered using a buffer
flush or other compatible fluid. Typically up to 3x the hold-up volume is recommended; however, exact volume
requirements depend upon the system.
8. Preparing Filters for Post-Use Integrity Testing
Exposure of product residues to incompatible fluids, potentially including the wetting fluid, may cause denaturing or
aggregation of the product, making removal of these residues by the wetting flush less likely.
The presence of product residues on the filter membrane may have an adverse effect on the wettability of the membrane.
Full wetting of the membrane is essential for the successful integrity testing of the filter.
If not already displaced by a product recovery flush, it is recommended that product residues be flushed from the filter
using a compatible fluid prior to flushing with the wetting fluid.
Page 8
Preparation, Use, and Integrity Testing of Pall Ultipor VF DV20 Filter Cartridges and Capsules
Post-use Integrity Test Flushing
9. Post-use Integrity Test Flushing
9.1 Flushing Using a Pump Arrangement
To flush using a pump arrangement, use the procedure detailed in Section 3.1.2: Flushing Pressure on page 6.
9.2 Flushing using a Pressure Arrangement
To flush using a pump arrangement, use the procedure detailed in Section 3.2: Flushing Using a Pressure Arrangement on
page 6.
10. Post-use Integrity Testing
For post-use integrity testing, use the procedures detailed in Section 4: Pre-use Integrity Testing on page 7.
11. Further Guidance for Integrity Testing
The Integrity test parameters for Ultipor VF DV20 capsules and filters should be obtained in advance by contacting Pall
Scientific and Laboratory Services. It is recommended that the test time is set to a minimum of 15 minutes (900 seconds)
to allow complete stabilization.
11.1 Failure Analysis/Troubleshooting
Following an integrity test failure, it is advised that the following be investigated:
1. Ensure there are no upstream leaks:
(i) Tighten all connections and if necessary disconnect and reconnect any joints.
(ii) Test the valves on the capsule by leak spray or by submerging that portion of the capsule or filter housing in
water and looking for bubbles.
(iii) If hardware leaks are observed on the capsule vents, open and close the vents a number of times to solve the
problem, if this is not successful, please return the products following the return procedure detailed in
Section 13: Filter Return Procedure on page 10.
2. Test assemblies using multiple capsules or housings individually to establish the location of the apparent failure.
3. Ensure environmental temperature is stable and the filter is not exposed to drafts or radiant heat. If stability
problems are encountered, shield the filter under test and the connecting tubing.
This can be accomplished by:
(i) insulating the test tubing with additional sleeving,
(ii) covering the filter and tubing with a suitable cover, or
(iii) placing the entire assembly in a closed-off fume cupboard or isolator.
If stability problems still occur, the filter assembly may be immersed in water (at room temperature) and tested, but it is
essential that water is not allowed to enter the outlet of the filter capsule.
4. Retesting
If points 1– 3 have been checked, and apparent integrity test failures are observed, repeat the flushing cycle.
Failure Analysis/Troubleshooting
Page 9
Failure Analysis/Troubleshooting
PDA Technical Report No. 41, Virus Filtration
6.4 Failure Analysis/Troubleshooting
If a virus filter fails an integrity test it could be damaged, but there may be other causes for the failure.
Any investigation of filter failure or retesting should be described in a standard operating procedure.
Part of the investigation should distinguish between filter damage and possible test problems or
artifacts.
To confirm corrective action, in the case of Forward/ Diffusion, Pressure Hold/Decay and Leak Tests,
re-wet the filter according to the specifications and repeat the test.
If the filter integrity test fails again, the Forward/Diffusion, Pressure Hold/Decay or Leak Tests may be
performed in a lower-surface-tension reference fluid (where specified by the filter manufacturer) to
assess filter wetability changes independent of filter integrity.
12. Typical Flush Volumes for Pall Ultipor VF DV20
Filters and Capsules
Table 2:
Section
3
5
7–8
9
Typical Flush Volumes for Pall Ultipor VF DV20 Filters and Capsules
AB1DV20
AB2DV20
AB3DV20
CL(M)05DV20
NP6DV20
NP7DV20
NP8DV20
0.07 m2
1 m2
2 m2
3 m2
Typical 30/70 v/v IPA/water flush
volume for pre-IT testing(1)
0.3 L
3L
6L
9L
Water flush for solvent removal post-IT
testing
0.5 L
5L
10 L
15 L
Typical pre-use buffer flush volume(2)
50 mL
1L
2L
3L
Typical post-use buffer flush
volume(2),(3)
50 mL
1L
2L
3L
Typical 30/70 IPA/water flush volume
for post-use IT testing(3)
0.3 L
3L
6L
9L
Typical Filter Area
(1) See Section 3: Preparation for Pre-use Integrity Testing on page 6.
(2) If dilution is problematic, the pre-use and post-use buffer flushes may be eliminated. It is however advisable to incorporate a flush at these stages
to minimize product losses through adsorption and fluid retention.
Flushing with buffer or water prior to the IPA flush for integrity testing is recommended to avoid potential product residue interactions, which may alter
the surface characteristics and hence the wettability of the membrane (Section 8 on page 8).
(3) If there is significant post-use blockage, the flow rate at this stage may be greatly reduced. The volume required for flushing may therefore be
reduced to avoid excessive flushing time. See Section 3: Preparation for Pre-use Integrity Testing. Should apparent integrity test failures be observed,
repeating the flushing cycle at this stage may assist (Section 11.1 on page 9).
13. Filter Return Procedure
In the event of having to return a filter for further evaluation, please contact your local sales representative.
1. Please ensure that a completed Material Safety Data Sheet accompanies any returned filter.
2. Please supply as much information as possible regarding the filter use and any tests performed.
Page 10
Preparation, Use, and Integrity Testing of Pall Ultipor VF DV20 Filter Cartridges and Capsules
Frequently Asked Questions
14. Frequently Asked Questions
Can I flush and process using a pressure vessel or do I need a pump?
Both methods are acceptable although there are practical considerations.
Any pump should be chosen to supply a controllable and constant pressure. Where processing is performed under defined
flow conditions, it is essential that the pressure is monitored at all times and the maximum pressure specifications or
validated flow rates are not exceeded. Blockage of the filters during filtration will lead to an increase in the differential
pressure at the set flow rate therefore pressure needs to be constantly monitored and the pump adjusted to prevent over
pressurization of the system.
Filtration using a pressurized vessel can drive the fluid through the filter under a constant pressure of up to
3 barg (43.5 psig). Using this arrangement supervision can be kept to a minimum, and where blockage does occur the
flow rate will simply decline. It is recommended that the process flow rate be monitored using this technique.[]
Pressurization of fluid over prolonged periods can increase the amount of dissolved gas in the process fluid.
Natural pressure changes across the filtration media may cause the fluid to degas, potentially forming trapped
air bubbles within the filtration media. These bubbles may adversely affect the observed flow rate and wetting
of the filters.
Pall recommends the Quattroflow* series of pump for medium to large-scale processes. These would include
CLM05DV20 size capsules and larger.
How do you recommend flushing the filter prior to integrity
testing?
Two ways to set up your system are shown below. In both instances, a pressure of 3.5 bar (50.8 psi) should be generated
upstream, with the downstream valve partially closed to provide a back-pressure of 1.5 bar (21.8 psi). It is highly
recommended that the flow rate be monitored and recorded to ensure slow filling and is documented together with the
corresponding integrity test results. Refer to Figures 3 – 6 for the flushing setup.
Does my process require any prefiltration?
One of the key advantages of Ultipor VF filters is that they can tolerate a higher level of filter plugging species, and their
constant pressure/flux capabilities can handle more complex or concentrated feeds. Therefore Ultipor VF virus filters
require less extensive, less complex prefiltration, thereby minimizing the risk of premature fouling and flux decay as
compared to other virus filters.
Although minimal prefiltration is required, Pall recommends that all fluids are prefiltered to at least 0.2 μm (preferably to
0.1 μm).
For the process fluid it is recommended that a filterability assessment be performed on a representative fluid to establish
the likely throughput and degree of blockage of the intended filtration system. Prefiltration may significantly increase the
life of the intended virus filter or reduce the process time by minimizing the reduction in flow rate associated with filter
blockage.
Prefiltration is also highly recommended if there is any storage prior to the virus filtration. Even if 0.2 μm or 0.1 μm
filtration prior to storage was performed, there is potential for aggregation, which may have a detrimental effect on the life
of the virus filter, to occur.
Failure Analysis/Troubleshooting
Page 11
Failure Analysis/Troubleshooting
Some typical prefilter recommendations can be seen below.
Table 3:
Prefilter Recommendations
Process Fluid
First Prefilter
Very clean fluids such as monoclonal
antibodies after purification by
chromatography
Supor® EKV
Fluorodyne® DFL
Second Prefilter
Final Filter
Not required
Ultipor VF DV20
Not required
Ultipor VF DV20
Ultipor N66 NF
Typical combination for many fluids
Fluorodyne DJL
Supor EKV
Typical combination for plasma
fractionation
Fluorodyne DFL
Ultipor VF DVD
Ultipor VF DV20
Ultipor N66 NF
Supor EKV
Fluids with very fine impurities not
removed by 0.1 μm or DVD
prefiltration.
Fluorodyne DFL
Ultipor VF UDV50
Ultipor VF DV20
Pegasus™ ULV6
How do I incorporate a prefilter into my system?
There are two ways in which prefiltration can be accomplished.
1. Filter through the prefilter into a holding vessel and then from the holding vessel through the virus filter. This can
be performed as shown above in two separate operations.
2. Attach the prefilter immediately upstream of the virus filter. Unless the prefilter blocks prematurely, this will
provide little restriction to the flow through the system.
For assistance with process optimization, pleaee contact Pall.
Pall can also design and supply customized disposable solutions to facilitate the prefiltration, virus filtration, sterile
filtration and storage of filtered product. These can be supplied at all scales to accommodate fast and reliable process
scale-up.
How can I avoid dilution?
If dilution is problematic, the pre-use and post-use buffer flushes may be eliminated. It is however advisable to incorporate
a flush at these stages to minimize product losses through adsorption and fluid retention.
Flushing with buffer or water prior to the IPA flush for integrity testing is recommended to avoid potential product
residue interactions, which may alter the surface characteristics and hence the wettability of the membrane (Section 8 on
page 8).
How do I handle significant flow decay due to blockage?
If there is significant post-use blockage, the flow rate at this stage may be greatly reduced. The volume required for
flushing may therefore be reduced to avoid excessive flushing time. See Section 3: Preparation for Pre-use Integrity
Testing. Should apparent integrity test failures be observed, repeating the flushing cycle at this stage may assist
(Section 11.1 on page 9).
Page 12
Preparation, Use, and Integrity Testing of Pall Ultipor VF DV20 Filter Cartridges and Capsules
Customer Service
15. Customer Service
Pall Scientific and Laboratory Services (SLS) is happy to help expedite your application procedures and to help you satisfy
your process-specific validation requirements.
Assembly and Installation
Detailed assembly, installation, and sterilization (if required) procedures are described in the following Pall publications:
•
•
•
•
USTR 805, Steam Sterilization of Pall Filter Assemblies
USD 2291, Assembly and Installation Procedures for Pall Pharmaceutical Grade Capsule Assemblies
USD 2296, Assembly and Installation Procedures for Pall Pharmaceutical Grade Filter Cartridges
USD 2398, Assembly and Installation Procedures for Pall Novasip Capsule Assemblies
Validation and Flushing
The validation and flushing recommendations for the integrity testing of Pall Ultipor VF DV20 filters when wet with
water is discussed in:
• USTR 2341, Validation of Forward Flow Integrity Test Parameters for Water Wet Filter Cartridges, and
• USTR 2405, Forward Flow Procedure for Water Wet Pall Ultipor VF DV20 AB Style Virus Removal Filter Cartridges
The validation of, and flushing recommendations for the integrity testing of Pall Ultipor VF DV20 filters when wet with
30/70 v/v IPA/water or 20/80 EtOH/water is discussed in:
• VG-DV20, Pall Ultipor VF Grade DV20 AB Style Virus Removal Filter Cartridges Validation Guide
• USTR 2324, Pall Ultipor VF Grade DV20 AB Ultipleat Style Virus Removal Filter Cartridges Validation Guide
Flushing Volumes
The information given above is for guidance only, and in part is taken from the method used for the validation of Ultipor
VF DV20 membrane filters (Pall publication No. VG-DV20). The application of process knowledge together with
individual validation or process specific requirements may require changes to be made. Pall can assist and comment on
any proposed changes that may be necessary.
Failure Analysis/Troubleshooting
Page 13
Failure Analysis/Troubleshooting
Page 14
Preparation, Use, and Integrity Testing of Pall Ultipor VF DV20 Filter Cartridges and Capsules
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Quattroflow is a trademark of Quatroflow Fluid Systems.
Part Numbers quoted above are protected by the Copyright of Pall Corporation.
® indicates a trademark registered in the USA.
© 2007, Pall Corporation.
03/08, USTR 2512
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